[PATCH v4 000/115] pwm: Fix lifetime issues for pwm_chips

[PATCH v4 000/115] pwm: Fix lifetime issues for pwm_chips

[Uwe Kleine-König]

Hello,

This series is based on Thierry's for-next.

It starts with some cleanups that were all sent out separately already:

 - "pwm: Reduce number of pointer dereferences in pwm_device_request()"
   https://lore.kernel.org/linux-pwm/20231130072105.966848-1-u.kleine-koenig@pengutronix.de
 - "pwm: crc: Use consistent variable naming for driver data"
   https://lore.kernel.org/linux-pwm/20231130074133.969806-1-u.kleine-koenig@pengutronix.de
 - Two leds/qcom-lpg patches
   https://lore.kernel.org/linux-leds/20231126095230.683204-1-u.kleine-koenig@pengutronix.de
   Lee already claimed to have taken the series already, but it's not yet in
   next.
 - "leds: qcom-lpg: Introduce a wrapper for getting driver data from a pwm chip"
   https://lore.kernel.org/linux-leds/20231124215208.616551-3-u.kleine-koenig@pengutronix.de

In the following patches I changed:

 - "pwm: cros-ec: Change prototype of helper to prepare further changes" +
   This was simplified in response to feedback by Tzung-Bi Shih
 - Make pwmchip_priv() static (and don't export it), let drivers use a new
   pwmchip_get_drvdata() instead.
 - For drm/ti-sn65dsi86.c and leds/qcom-lpg make use of
   pwmchip_set_drvdata() which makes the conversion to
   devm_pwmchip_alloc() much prettier.
 - Some cleanups here and there
 - Add review tags received in v3
   I kept all tags even though the pwmchip_alloc() patches changed
   slightly. Most of the time that's only
   s/pwmchip_priv/pwmchip_get_drvdata/ though. Still, if you object,
   just tell me. (This affects Paul Cercueil on patch #68, Conor Dooley
   on patch #76 and Greg for patch #109.)

I kept the pwmchip_alloc() + pwmchip_register() approach despite Bart
not liking it. To balance that out I don't like Bart's alternative
approach. There are no technically relevant differences between the two
approaches and no benchmarks that show either of the two to be better
than the other. Conceptually the design ideas around pwmchip_alloc() +
pwmchip_register() are used in several other subsystems, so it's a
proven way to do things.

In the discussion about v3 Bart pointed out that there is an imbalance
in the function naming, as pwmchip_alloc() must be paired with
pwmchip_put() (and not something like pwmchip_free()). (This is hidden
from the drivers though, as they all use a devm_pwmchip_alloc() which
does the right thing for them.) I could be talked into renaming
pwmchip_alloc() to pwmchip_get_new(). I hesitated to do that though as
other subsystems also use foo_alloc() and I'm ambivalent about which is
the better name.

Thierry objected to patch "pwm: Ensure that pwm_chips are allocated
using pwmchip_alloc()". I still think it's a nice idea to do that. It
only adds very little overhead in a slow path and might save some time
for people working on an out-of-tree driver. So it also helps the folks
who currently work on new drivers for mainline who rebase on a tree
containing this series. I won't insist about that one though, it can
just be dropped.

Otherwise I should have addressed all feedback and hope the series is
now pretty enough to not cause further concerns.

The last patch shows a prototype of the motivation for improving the
lifetime tracking implemented in this series. It contains a character
device userspace API to use PWMs that is considerably faster and easier
to use than the sysfs API; apply() is faster by a factor of 4 on my test
machine (arm/stm32mp1).

Note that currently there is no known issue with lifetimes in the pwm
subsystem as device links ensure that consumers go away if a pwm_chip
gets unbound. There was an issue before, but that wasn't PWM specific
and is fixed in v6.7-rc1~77^2~3 ("driver core: Release all resources
during unbind before updating device links")[1]
In the presence of character devices making use of PWMs, such an
improved lifetime tracking becomes necessary, otherwise unloading
drivers (or unbinding/hotplugging devices) might crash the kernel.

As calls to .apply() are serialized now, the locking in several drivers
could just be dropped in a future cleanup. I didn't do that now to not
enlarge the series still more and maybe the locking in the core can be
changed to be more fine-grained (abusing(?) a reader-writer-lock) which
would allow concurrent callers for different lines of a single pwm_chip.
In that case the locking must not be dropped.

Also the explicit device links could be dropped now as they are not
strictly needed any more (though requested PWMs might just stop working
when the lowlevel driver is unbound which is a bit ugly, but can happen
at any time for other reasons). Also on systems probed from device tree
there are device links between consumers and providers anyhow. (Don't
know about ACPI systems, I think there are device links then.)

Best regards
Uwe

[1] This fix is also backported to the various stable releases
(v6.6.3, v6.5.13, v6.1.64, v5.15.140; about to go into v5.10.x, v5.4.x,
v4.19.x and v4.14.x)

Uwe Kleine-König (115):
  pwm: Reduce number of pointer dereferences in pwm_device_request()
  pwm: crc: Use consistent variable naming for driver data
  leds: qcom-lpg: Use devm_pwmchip_add() simplifying driver removal
  leds: qcom-lpg: Consistenly use dev_err_probe() in .probe()'s error path
  leds: qcom-lpg: Introduce a wrapper for getting driver data from a pwm chip
  pwm: cros-ec: Change prototype of helpers to prepare further changes
  pwm: Provide a macro to get the parent device of a given chip
  pwm: ab8500: Make use of pwmchip_parent() macro
  pwm: atmel: Make use of pwmchip_parent() macro
  pwm: atmel-tcb: Make use of pwmchip_parent() macro
  pwm: bcm-kona: Make use of pwmchip_parent() macro
  pwm: crc: Make use of pwmchip_parent() macro
  pwm: cros-ec: Make use of pwmchip_parent() macro
  pwm: dwc: Make use of pwmchip_parent() macro
  pwm: ep93xx: Make use of pwmchip_parent() macro
  pwm: fsl-ftm: Make use of pwmchip_parent() macro
  pwm: img: Make use of parent device pointer in driver data
  pwm: imx27: Make use of pwmchip_parent() macro
  pwm: jz4740: Make use of pwmchip_parent() macro
  pwm: lpc18xx-sct: Make use of parent device pointer in driver data
  pwm: lpss: Make use of pwmchip_parent() macro
  pwm: mediatek: Make use of pwmchip_parent() macro
  pwm: meson: Make use of pwmchip_parent() macro
  pwm: mtk-disp: Make use of pwmchip_parent() macro
  pwm: omap: Make use of pwmchip_parent() macro
  pwm: pca9685: Store parent device in driver data
  pwm: raspberrypi-poe: Make use of pwmchip_parent() macro
  pwm: rcar: Make use of pwmchip_parent() macro
  pwm: rz-mtu3: Make use of pwmchip_parent() macro
  pwm: samsung: Make use of pwmchip_parent() macro
  pwm: sifive: Make use of pwmchip_parent() macro
  pwm: stm32-lp: Make use of pwmchip_parent() macro
  pwm: stm32: Make use of pwmchip_parent() macro
  pwm: stmpe: Make use of pwmchip_parent() macro
  pwm: sun4i: Make use of pwmchip_parent() macro
  pwm: tiecap: Make use of pwmchip_parent() macro
  pwm: tiehrpwm: Make use of pwmchip_parent() macro
  pwm: twl-led: Make use of pwmchip_parent() macro
  pwm: twl: Make use of pwmchip_parent() macro
  pwm: vt8500: Make use of pwmchip_parent() macro
  staging: greybus: pwm: Make use of pwmchip_parent() macro
  pwm: Provide wrappers for storing and getting driver private data
  pwm: Provide devm_pwmchip_alloc() function
  pwm: ab8500: Make use of devm_pwmchip_alloc() function
  pwm: apple: Make use of devm_pwmchip_alloc() function
  pwm: atmel-hlcdc: Make use of devm_pwmchip_alloc() function
  pwm: atmel: Make use of devm_pwmchip_alloc() function
  pwm: atmel-tcb: Make use of devm_pwmchip_alloc() function
  pwm: bcm2835: Make use of devm_pwmchip_alloc() function
  pwm: bcm-iproc: Make use of devm_pwmchip_alloc() function
  pwm: bcm-kona: Make use of devm_pwmchip_alloc() function
  pwm: berlin: Make use of devm_pwmchip_alloc() function
  pwm: brcmstb: Make use of devm_pwmchip_alloc() function
  pwm: clk: Make use of devm_pwmchip_alloc() function
  pwm: clps711x: Make use of devm_pwmchip_alloc() function
  pwm: crc: Make use of devm_pwmchip_alloc() function
  pwm: cros-ec: Make use of devm_pwmchip_alloc() function
  pwm: dwc: Make use of devm_pwmchip_alloc() function
  pwm: ep93xx: Make use of devm_pwmchip_alloc() function
  pwm: fsl-ftm: Make use of devm_pwmchip_alloc() function
  pwm: hibvt: Make use of devm_pwmchip_alloc() function
  pwm: img: Make use of devm_pwmchip_alloc() function
  pwm: imx1: Make use of devm_pwmchip_alloc() function
  pwm: imx27: Make use of devm_pwmchip_alloc() function
  pwm: imx-tpm: Make use of devm_pwmchip_alloc() function
  pwm: intel-lgm: Make use of devm_pwmchip_alloc() function
  pwm: iqs620a: Make use of devm_pwmchip_alloc() function
  pwm: jz4740: Make use of devm_pwmchip_alloc() function
  pwm: keembay: Make use of devm_pwmchip_alloc() function
  pwm: lp3943: Make use of devm_pwmchip_alloc() function
  pwm: lpc18xx-sct: Make use of devm_pwmchip_alloc() function
  pwm: lpc32xx: Make use of devm_pwmchip_alloc() function
  pwm: lpss-*: Make use of devm_pwmchip_alloc() function
  pwm: mediatek: Make use of devm_pwmchip_alloc() function
  pwm: meson: Make use of devm_pwmchip_alloc() function
  pwm: microchip-core: Make use of devm_pwmchip_alloc() function
  pwm: mtk-disp: Make use of devm_pwmchip_alloc() function
  pwm: mxs: Make use of devm_pwmchip_alloc() function
  pwm: ntxec: Make use of devm_pwmchip_alloc() function
  pwm: omap-dmtimer: Make use of devm_pwmchip_alloc() function
  pwm: pca9685: Make use of devm_pwmchip_alloc() function
  pwm: pxa: Make use of devm_pwmchip_alloc() function
  pwm: raspberrypi-poe: Make use of devm_pwmchip_alloc() function
  pwm: rcar: Make use of devm_pwmchip_alloc() function
  pwm: renesas-tpu: Make use of devm_pwmchip_alloc() function
  pwm: rockchip: Make use of devm_pwmchip_alloc() function
  pwm: rz-mtu3: Make use of devm_pwmchip_alloc() function
  pwm: samsung: Make use of devm_pwmchip_alloc() function
  pwm: sifive: Make use of devm_pwmchip_alloc() function
  pwm: sl28cpld: Make use of devm_pwmchip_alloc() function
  pwm: spear: Make use of devm_pwmchip_alloc() function
  pwm: sprd: Make use of devm_pwmchip_alloc() function
  pwm: sti: Make use of devm_pwmchip_alloc() function
  pwm: stm32-lp: Make use of devm_pwmchip_alloc() function
  pwm: stm32: Make use of devm_pwmchip_alloc() function
  pwm: stmpe: Make use of devm_pwmchip_alloc() function
  pwm: sun4i: Make use of devm_pwmchip_alloc() function
  pwm: sunplus: Make use of devm_pwmchip_alloc() function
  pwm: tegra: Make use of devm_pwmchip_alloc() function
  pwm: tiecap: Make use of devm_pwmchip_alloc() function
  pwm: twl-led: Make use of devm_pwmchip_alloc() function
  pwm: twl: Make use of devm_pwmchip_alloc() function
  pwm: visconti: Make use of devm_pwmchip_alloc() function
  pwm: vt8500: Make use of devm_pwmchip_alloc() function
  pwm: xilinx: Make use of devm_pwmchip_alloc() function
  gpio: mvebu: Make use of devm_pwmchip_alloc() function
  drm/bridge: ti-sn65dsi86: Make use of devm_pwmchip_alloc() function
  leds: qcom-lpg: Make use of devm_pwmchip_alloc() function
  staging: greybus: pwm: Make use of devm_pwmchip_alloc() function
  pwm: Ensure that pwm_chips are allocated using pwmchip_alloc()
  pwm: Ensure a struct pwm has the same lifetime as its pwm_chip
  pwm: Ensure the memory backing a PWM chip isn't freed while used
  pwm: Add more locking
  pwm: Make pwmchip_[sg]et_drvdata a wrapper around dev_set_drvdata
  WIP: pwm: Add support for pwmchip devices for faster and easier userspace access

 .../driver-api/driver-model/devres.rst        |   1 +
 Documentation/driver-api/pwm.rst              |  10 +-
 drivers/gpio/gpio-mvebu.c                     |  18 +-
 drivers/gpu/drm/bridge/ti-sn65dsi86.c         |  27 +-
 drivers/leds/rgb/leds-qcom-lpg.c              |  75 ++-
 drivers/pwm/Kconfig                           |   4 -
 drivers/pwm/Makefile                          |   3 +-
 drivers/pwm/core.c                            | 490 +++++++++++++++---
 drivers/pwm/pwm-ab8500.c                      |  36 +-
 drivers/pwm/pwm-apple.c                       |  18 +-
 drivers/pwm/pwm-atmel-hlcdc.c                 |  35 +-
 drivers/pwm/pwm-atmel-tcb.c                   |  26 +-
 drivers/pwm/pwm-atmel.c                       |  37 +-
 drivers/pwm/pwm-bcm-iproc.c                   |  19 +-
 drivers/pwm/pwm-bcm-kona.c                    |  21 +-
 drivers/pwm/pwm-bcm2835.c                     |  17 +-
 drivers/pwm/pwm-berlin.c                      |  29 +-
 drivers/pwm/pwm-brcmstb.c                     |  17 +-
 drivers/pwm/pwm-clk.c                         |  27 +-
 drivers/pwm/pwm-clps711x.c                    |  21 +-
 drivers/pwm/pwm-crc.c                         |  26 +-
 drivers/pwm/pwm-cros-ec.c                     |  55 +-
 drivers/pwm/pwm-dwc-core.c                    |  25 +-
 drivers/pwm/pwm-dwc.c                         |  18 +-
 drivers/pwm/pwm-dwc.h                         |   9 +-
 drivers/pwm/pwm-ep93xx.c                      |  21 +-
 drivers/pwm/pwm-fsl-ftm.c                     |  48 +-
 drivers/pwm/pwm-hibvt.c                       |  25 +-
 drivers/pwm/pwm-img.c                         |  51 +-
 drivers/pwm/pwm-imx-tpm.c                     |  34 +-
 drivers/pwm/pwm-imx1.c                        |  20 +-
 drivers/pwm/pwm-imx27.c                       |  26 +-
 drivers/pwm/pwm-intel-lgm.c                   |  17 +-
 drivers/pwm/pwm-iqs620a.c                     |  37 +-
 drivers/pwm/pwm-jz4740.c                      |  35 +-
 drivers/pwm/pwm-keembay.c                     |  17 +-
 drivers/pwm/pwm-lp3943.c                      |  17 +-
 drivers/pwm/pwm-lpc18xx-sct.c                 |  35 +-
 drivers/pwm/pwm-lpc32xx.c                     |  21 +-
 drivers/pwm/pwm-lpss-pci.c                    |  10 +-
 drivers/pwm/pwm-lpss-platform.c               |  10 +-
 drivers/pwm/pwm-lpss.c                        |  34 +-
 drivers/pwm/pwm-lpss.h                        |   1 -
 drivers/pwm/pwm-mediatek.c                    |  28 +-
 drivers/pwm/pwm-meson.c                       |  57 +-
 drivers/pwm/pwm-microchip-core.c              |  17 +-
 drivers/pwm/pwm-mtk-disp.c                    |  25 +-
 drivers/pwm/pwm-mxs.c                         |  32 +-
 drivers/pwm/pwm-ntxec.c                       |  30 +-
 drivers/pwm/pwm-omap-dmtimer.c                |  46 +-
 drivers/pwm/pwm-pca9685.c                     |  98 ++--
 drivers/pwm/pwm-pxa.c                         |  21 +-
 drivers/pwm/pwm-raspberrypi-poe.c             |  20 +-
 drivers/pwm/pwm-rcar.c                        |  25 +-
 drivers/pwm/pwm-renesas-tpu.c                 |  18 +-
 drivers/pwm/pwm-rockchip.c                    |  24 +-
 drivers/pwm/pwm-rz-mtu3.c                     |  38 +-
 drivers/pwm/pwm-samsung.c                     |  56 +-
 drivers/pwm/pwm-sifive.c                      |  30 +-
 drivers/pwm/pwm-sl28cpld.c                    |  13 +-
 drivers/pwm/pwm-spear.c                       |  17 +-
 drivers/pwm/pwm-sprd.c                        |  50 +-
 drivers/pwm/pwm-sti.c                         |  34 +-
 drivers/pwm/pwm-stm32-lp.c                    |  29 +-
 drivers/pwm/pwm-stm32.c                       |  53 +-
 drivers/pwm/pwm-stmpe.c                       |  58 ++-
 drivers/pwm/pwm-sun4i.c                       |  38 +-
 drivers/pwm/pwm-sunplus.c                     |  17 +-
 drivers/pwm/pwm-tegra.c                       |  27 +-
 drivers/pwm/pwm-tiecap.c                      |  55 +-
 drivers/pwm/pwm-tiehrpwm.c                    |  72 +--
 drivers/pwm/pwm-twl-led.c                     |  58 ++-
 drivers/pwm/pwm-twl.c                         |  50 +-
 drivers/pwm/pwm-visconti.c                    |  17 +-
 drivers/pwm/pwm-vt8500.c                      |  41 +-
 drivers/pwm/pwm-xilinx.c                      |  34 +-
 drivers/pwm/sysfs.c                           |  64 +--
 drivers/staging/greybus/pwm.c                 | 130 ++---
 include/linux/platform_data/x86/pwm-lpss.h    |   4 +-
 include/linux/pwm.h                           |  43 +-
 include/uapi/linux/pwm.h                      |  23 +
 81 files changed, 1690 insertions(+), 1325 deletions(-)
 create mode 100644 include/uapi/linux/pwm.h

base-commit: 6d0589a70587116c7ff09e027659c6254f883b2d
-- 
2.42.0

[PATCH v4 001/115] pwm: Reduce number of pointer dereferences in pwm_device_request()

[Uwe Kleine-König]

pwm->chip and pwm->chip->ops are used several times in this function.
Introduce local variables for these.

There is no semantical change, but with ARCH=arm, allmodconfig and
gcc-13 bloat-o-meter reports a slight improvement:

	add/remove: 1/1 grow/shrink: 1/1 up/down: 8/-36 (-28)
	Function                                     old     new   delta
	pwm_apply_state                              476     480      +4
	__initcall__kmod_core__307_1092_pwm_debugfs_init4       -       4      +4
	__initcall__kmod_core__307_1090_pwm_debugfs_init4       4       -      -4
	pwm_request_from_chip                        628     596     -32
	Total: Before=15091, After=15063, chg -0.19%

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
Note this patch was already sent individually, find it at
https://lore.kernel.org/linux-pwm/20231130072105.966848-1-u.kleine-koenig@pengutronix.de

 drivers/pwm/core.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index f60b715abe62..eea93ed8a49b 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -59,22 +59,24 @@ static struct pwm_chip *pwmchip_find_by_name(const char *name)
 static int pwm_device_request(struct pwm_device *pwm, const char *label)
 {
 	int err;
+	struct pwm_chip *chip = pwm->chip;
+	const struct pwm_ops *ops = chip->ops;
 
 	if (test_bit(PWMF_REQUESTED, &pwm->flags))
 		return -EBUSY;
 
-	if (!try_module_get(pwm->chip->owner))
+	if (!try_module_get(chip->owner))
 		return -ENODEV;
 
-	if (pwm->chip->ops->request) {
-		err = pwm->chip->ops->request(pwm->chip, pwm);
+	if (ops->request) {
+		err = ops->request(chip, pwm);
 		if (err) {
-			module_put(pwm->chip->owner);
+			module_put(chip->owner);
 			return err;
 		}
 	}
 
-	if (pwm->chip->ops->get_state) {
+	if (ops->get_state) {
 		/*
 		 * Zero-initialize state because most drivers are unaware of
 		 * .usage_power. The other members of state are supposed to be
@@ -84,7 +86,7 @@ static int pwm_device_request(struct pwm_device *pwm, const char *label)
 		 */
 		struct pwm_state state = { 0, };
 
-		err = pwm->chip->ops->get_state(pwm->chip, pwm, &state);
+		err = ops->get_state(chip, pwm, &state);
 		trace_pwm_get(pwm, &state, err);
 
 		if (!err)
-- 
2.42.0

[PATCH v4 002/115] pwm: crc: Use consistent variable naming for driver data

[Uwe Kleine-König]

All but one local variable of type pointer to struct crystalcove_pwm are
called "crc_pwm", the one outlier is called "pwm" which is usually
reserved for variables of type pointer to struct pwm_device.

So rename that one "pwm" to "crc_pwm" for consistency.

Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
Note this patch was already sent out individually, find it at
https://lore.kernel.org/linux-pwm/20231130074133.969806-1-u.kleine-koenig@pengutronix.de

 drivers/pwm/pwm-crc.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/pwm/pwm-crc.c b/drivers/pwm/pwm-crc.c
index 2b0b659eee97..e09358901ab5 100644
--- a/drivers/pwm/pwm-crc.c
+++ b/drivers/pwm/pwm-crc.c
@@ -160,22 +160,22 @@ static const struct pwm_ops crc_pwm_ops = {
 
 static int crystalcove_pwm_probe(struct platform_device *pdev)
 {
-	struct crystalcove_pwm *pwm;
+	struct crystalcove_pwm *crc_pwm;
 	struct device *dev = pdev->dev.parent;
 	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 
-	pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
-	if (!pwm)
+	crc_pwm = devm_kzalloc(&pdev->dev, sizeof(*crc_pwm), GFP_KERNEL);
+	if (!crc_pwm)
 		return -ENOMEM;
 
-	pwm->chip.dev = &pdev->dev;
-	pwm->chip.ops = &crc_pwm_ops;
-	pwm->chip.npwm = 1;
+	crc_pwm->chip.dev = &pdev->dev;
+	crc_pwm->chip.ops = &crc_pwm_ops;
+	crc_pwm->chip.npwm = 1;
 
 	/* get the PMIC regmap */
-	pwm->regmap = pmic->regmap;
+	crc_pwm->regmap = pmic->regmap;
 
-	return devm_pwmchip_add(&pdev->dev, &pwm->chip);
+	return devm_pwmchip_add(&pdev->dev, &crc_pwm->chip);
 }
 
 static struct platform_driver crystalcove_pwm_driver = {
-- 
2.42.0

[PATCH v4 006/115] pwm: cros-ec: Change prototype of helpers to prepare further changes

[Uwe Kleine-König]

pwm_chip allocation and registration is about to change. For that the
number of PWM devices must be known earlier in cros_ec_pwm_probe(). So
make cros_ec_pwm_get_duty() and cros_ec_num_pwms() independent of
struct cros_ec_pwm_device which is only available later.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-cros-ec.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/pwm/pwm-cros-ec.c b/drivers/pwm/pwm-cros-ec.c
index 9a8f1b6a4e13..b75478e37ecf 100644
--- a/drivers/pwm/pwm-cros-ec.c
+++ b/drivers/pwm/pwm-cros-ec.c
@@ -94,9 +94,8 @@ static int cros_ec_pwm_set_duty(struct cros_ec_pwm_device *ec_pwm, u8 index,
 	return cros_ec_cmd_xfer_status(ec, msg);
 }
 
-static int cros_ec_pwm_get_duty(struct cros_ec_pwm_device *ec_pwm, u8 index)
+static int cros_ec_pwm_get_duty(struct cros_ec_device *ec, bool use_pwm_type, u8 index)
 {
-	struct cros_ec_device *ec = ec_pwm->ec;
 	struct {
 		struct cros_ec_command msg;
 		union {
@@ -116,7 +115,7 @@ static int cros_ec_pwm_get_duty(struct cros_ec_pwm_device *ec_pwm, u8 index)
 	msg->insize = sizeof(*resp);
 	msg->outsize = sizeof(*params);
 
-	if (ec_pwm->use_pwm_type) {
+	if (use_pwm_type) {
 		ret = cros_ec_dt_type_to_pwm_type(index, &params->pwm_type);
 		if (ret) {
 			dev_err(ec->dev, "Invalid PWM type index: %d\n", index);
@@ -172,7 +171,7 @@ static int cros_ec_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 	struct cros_ec_pwm *channel = &ec_pwm->channel[pwm->hwpwm];
 	int ret;
 
-	ret = cros_ec_pwm_get_duty(ec_pwm, pwm->hwpwm);
+	ret = cros_ec_pwm_get_duty(ec_pwm->ec, ec_pwm->use_pwm_type, pwm->hwpwm);
 	if (ret < 0) {
 		dev_err(chip->dev, "error getting initial duty: %d\n", ret);
 		return ret;
@@ -227,13 +226,17 @@ static const struct pwm_ops cros_ec_pwm_ops = {
  * of PWMs it supports directly, so we have to read the pwm duty cycle for
  * subsequent channels until we get an error.
  */
-static int cros_ec_num_pwms(struct cros_ec_pwm_device *ec_pwm)
+static int cros_ec_num_pwms(struct cros_ec_device *ec)
 {
 	int i, ret;
 
 	/* The index field is only 8 bits */
 	for (i = 0; i <= U8_MAX; i++) {
-		ret = cros_ec_pwm_get_duty(ec_pwm, i);
+		/*
+		 * Note that this function is only called when use_pwm_type is
+		 * false. With use_pwm_type == true the number of PWMs is fixed.
+		 */
+		ret = cros_ec_pwm_get_duty(ec, false, i);
 		/*
 		 * We look for SUCCESS, INVALID_COMMAND, or INVALID_PARAM
 		 * responses; everything else is treated as an error.
@@ -285,7 +288,7 @@ static int cros_ec_pwm_probe(struct platform_device *pdev)
 	if (ec_pwm->use_pwm_type) {
 		chip->npwm = CROS_EC_PWM_DT_COUNT;
 	} else {
-		ret = cros_ec_num_pwms(ec_pwm);
+		ret = cros_ec_num_pwms(ec);
 		if (ret < 0)
 			return dev_err_probe(dev, ret, "Couldn't find PWMs\n");
 		chip->npwm = ret;
-- 
2.42.0

[PATCH v4 007/115] pwm: Provide a macro to get the parent device of a given chip

[Uwe Kleine-König]

Currently a pwm_chip stores in it's struct device *dev member a pointer
to the parent device. Preparing a change that embeds a full struct
device in struct pwm_chip, this accessor macro should be used in all
drivers directly accessing chip->dev now. This way struct pwm_chip and
this macro can be changed without having to touch all drivers in the
same change set.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 include/linux/pwm.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index f87655c06c82..e069900d1a36 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -302,6 +302,11 @@ struct pwm_chip {
 	struct pwm_device *pwms;
 };
 
+static inline struct device *pwmchip_parent(struct pwm_chip *chip)
+{
+	return chip->dev;
+}
+
 #if IS_ENABLED(CONFIG_PWM)
 /* PWM user APIs */
 int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state);
-- 
2.42.0

[PATCH v4 008/115] pwm: ab8500: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-ab8500.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-ab8500.c b/drivers/pwm/pwm-ab8500.c
index 670d33daea84..719e4ccf1800 100644
--- a/drivers/pwm/pwm-ab8500.c
+++ b/drivers/pwm/pwm-ab8500.c
@@ -92,12 +92,12 @@ static int ab8500_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	 * when disabled.
 	 */
 	if (!state->enabled || duty_steps == 0) {
-		ret = abx500_mask_and_set_register_interruptible(chip->dev,
+		ret = abx500_mask_and_set_register_interruptible(pwmchip_parent(chip),
 					AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
 					1 << ab8500->hwid, 0);
 
 		if (ret < 0)
-			dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
+			dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM, Error %d\n",
 								pwm->label, ret);
 		return ret;
 	}
@@ -115,22 +115,22 @@ static int ab8500_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	reg = AB8500_PWM_OUT_CTRL1_REG + (ab8500->hwid * 2);
 
-	ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
+	ret = abx500_set_register_interruptible(pwmchip_parent(chip), AB8500_MISC,
 			reg, lower_val);
 	if (ret < 0)
 		return ret;
 
-	ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
+	ret = abx500_set_register_interruptible(pwmchip_parent(chip), AB8500_MISC,
 			(reg + 1), higher_val);
 	if (ret < 0)
 		return ret;
 
 	/* enable */
-	ret = abx500_mask_and_set_register_interruptible(chip->dev,
+	ret = abx500_mask_and_set_register_interruptible(pwmchip_parent(chip),
 				AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
 				1 << ab8500->hwid, 1 << ab8500->hwid);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to enable PWM, Error %d\n",
+		dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM, Error %d\n",
 							pwm->label, ret);
 
 	return ret;
@@ -144,7 +144,7 @@ static int ab8500_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 	struct ab8500_pwm_chip *ab8500 = ab8500_pwm_from_chip(chip);
 	unsigned int div, duty_steps;
 
-	ret = abx500_get_register_interruptible(chip->dev, AB8500_MISC,
+	ret = abx500_get_register_interruptible(pwmchip_parent(chip), AB8500_MISC,
 						AB8500_PWM_OUT_CTRL7_REG,
 						&ctrl7);
 	if (ret)
@@ -157,13 +157,13 @@ static int ab8500_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 		return 0;
 	}
 
-	ret = abx500_get_register_interruptible(chip->dev, AB8500_MISC,
+	ret = abx500_get_register_interruptible(pwmchip_parent(chip), AB8500_MISC,
 						AB8500_PWM_OUT_CTRL1_REG + (ab8500->hwid * 2),
 						&lower_val);
 	if (ret)
 		return ret;
 
-	ret = abx500_get_register_interruptible(chip->dev, AB8500_MISC,
+	ret = abx500_get_register_interruptible(pwmchip_parent(chip), AB8500_MISC,
 						AB8500_PWM_OUT_CTRL2_REG + (ab8500->hwid * 2),
 						&higher_val);
 	if (ret)
-- 
2.42.0

[PATCH v4 009/115] pwm: atmel: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-atmel.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index 47bcc8a3bf9d..4ef91fe6f147 100644
--- a/drivers/pwm/pwm-atmel.c
+++ b/drivers/pwm/pwm-atmel.c
@@ -210,7 +210,7 @@ static int atmel_pwm_calculate_cprd_and_pres(struct pwm_chip *chip,
 	shift = fls(cycles) - atmel_pwm->data->cfg.period_bits;
 
 	if (shift > PWM_MAX_PRES) {
-		dev_err(chip->dev, "pres exceeds the maximum value\n");
+		dev_err(pwmchip_parent(chip), "pres exceeds the maximum value\n");
 		return -EINVAL;
 	} else if (shift > 0) {
 		*pres = shift;
@@ -321,7 +321,7 @@ static int atmel_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 		ret = atmel_pwm_calculate_cprd_and_pres(chip, clkrate, state, &cprd,
 							&pres);
 		if (ret) {
-			dev_err(chip->dev,
+			dev_err(pwmchip_parent(chip),
 				"failed to calculate cprd and prescaler\n");
 			return ret;
 		}
@@ -333,7 +333,7 @@ static int atmel_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 		} else {
 			ret = clk_enable(atmel_pwm->clk);
 			if (ret) {
-				dev_err(chip->dev, "failed to enable clock\n");
+				dev_err(pwmchip_parent(chip), "failed to enable clock\n");
 				return ret;
 			}
 		}
@@ -462,8 +462,9 @@ static const struct of_device_id atmel_pwm_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, atmel_pwm_dt_ids);
 
-static int atmel_pwm_enable_clk_if_on(struct atmel_pwm_chip *atmel_pwm, bool on)
+static int atmel_pwm_enable_clk_if_on(struct pwm_chip *chip, bool on)
 {
+	struct atmel_pwm_chip *atmel_pwm = to_atmel_pwm_chip(chip);
 	unsigned int i, cnt = 0;
 	unsigned long sr;
 	int ret = 0;
@@ -480,7 +481,7 @@ static int atmel_pwm_enable_clk_if_on(struct atmel_pwm_chip *atmel_pwm, bool on)
 	for (i = 0; i < cnt; i++) {
 		ret = clk_enable(atmel_pwm->clk);
 		if (ret) {
-			dev_err(atmel_pwm->chip.dev,
+			dev_err(pwmchip_parent(chip),
 				"failed to enable clock for pwm %pe\n",
 				ERR_PTR(ret));
 
@@ -525,7 +526,7 @@ static int atmel_pwm_probe(struct platform_device *pdev)
 	atmel_pwm->chip.ops = &atmel_pwm_ops;
 	atmel_pwm->chip.npwm = 4;
 
-	ret = atmel_pwm_enable_clk_if_on(atmel_pwm, true);
+	ret = atmel_pwm_enable_clk_if_on(&atmel_pwm->chip, true);
 	if (ret < 0)
 		return ret;
 
@@ -538,7 +539,7 @@ static int atmel_pwm_probe(struct platform_device *pdev)
 	return 0;
 
 disable_clk:
-	atmel_pwm_enable_clk_if_on(atmel_pwm, false);
+	atmel_pwm_enable_clk_if_on(&atmel_pwm->chip, false);
 
 	return ret;
 }
-- 
2.42.0

[PATCH v4 010/115] pwm: atmel-tcb: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-atmel-tcb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c
index d42c897cb85e..80121ab81a01 100644
--- a/drivers/pwm/pwm-atmel-tcb.c
+++ b/drivers/pwm/pwm-atmel-tcb.c
@@ -327,7 +327,7 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	if ((atcbpwm && atcbpwm->duty > 0 &&
 			atcbpwm->duty != atcbpwm->period) &&
 		(atcbpwm->div != i || atcbpwm->period != period)) {
-		dev_err(chip->dev,
+		dev_err(pwmchip_parent(chip),
 			"failed to configure period_ns: PWM group already configured with a different value\n");
 		return -EINVAL;
 	}
-- 
2.42.0

[PATCH v4 011/115] pwm: bcm-kona: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-bcm-kona.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pwm/pwm-bcm-kona.c b/drivers/pwm/pwm-bcm-kona.c
index 45046a5c20a5..47acae8d7478 100644
--- a/drivers/pwm/pwm-bcm-kona.c
+++ b/drivers/pwm/pwm-bcm-kona.c
@@ -164,7 +164,7 @@ static int kona_pwmc_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	ret = clk_prepare_enable(kp->clk);
 	if (ret < 0) {
-		dev_err(chip->dev, "failed to enable clock: %d\n", ret);
+		dev_err(pwmchip_parent(chip), "failed to enable clock: %d\n", ret);
 		return ret;
 	}
 
@@ -193,7 +193,7 @@ static int kona_pwmc_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = clk_prepare_enable(kp->clk);
 	if (ret < 0) {
-		dev_err(chip->dev, "failed to enable clock: %d\n", ret);
+		dev_err(pwmchip_parent(chip), "failed to enable clock: %d\n", ret);
 		return ret;
 	}
 
-- 
2.42.0

[PATCH v4 012/115] pwm: crc: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-crc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pwm/pwm-crc.c b/drivers/pwm/pwm-crc.c
index e09358901ab5..c8a852345a97 100644
--- a/drivers/pwm/pwm-crc.c
+++ b/drivers/pwm/pwm-crc.c
@@ -55,7 +55,7 @@ static int crc_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 			 const struct pwm_state *state)
 {
 	struct crystalcove_pwm *crc_pwm = to_crc_pwm(chip);
-	struct device *dev = crc_pwm->chip.dev;
+	struct device *dev = pwmchip_parent(chip);
 	int err;
 
 	if (state->period > PWM_MAX_PERIOD_NS) {
@@ -125,7 +125,7 @@ static int crc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 			     struct pwm_state *state)
 {
 	struct crystalcove_pwm *crc_pwm = to_crc_pwm(chip);
-	struct device *dev = crc_pwm->chip.dev;
+	struct device *dev = pwmchip_parent(chip);
 	unsigned int clk_div, clk_div_reg, duty_cycle_reg;
 	int error;
 
-- 
2.42.0

[PATCH v4 013/115] pwm: cros-ec: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-cros-ec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-cros-ec.c b/drivers/pwm/pwm-cros-ec.c
index b75478e37ecf..6c86cd4ba538 100644
--- a/drivers/pwm/pwm-cros-ec.c
+++ b/drivers/pwm/pwm-cros-ec.c
@@ -173,7 +173,7 @@ static int cros_ec_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	ret = cros_ec_pwm_get_duty(ec_pwm->ec, ec_pwm->use_pwm_type, pwm->hwpwm);
 	if (ret < 0) {
-		dev_err(chip->dev, "error getting initial duty: %d\n", ret);
+		dev_err(pwmchip_parent(chip), "error getting initial duty: %d\n", ret);
 		return ret;
 	}
 
-- 
2.42.0

[PATCH v4 014/115] pwm: dwc: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-dwc-core.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pwm/pwm-dwc-core.c b/drivers/pwm/pwm-dwc-core.c
index ea63dd741f5c..146e40ccc4d3 100644
--- a/drivers/pwm/pwm-dwc-core.c
+++ b/drivers/pwm/pwm-dwc-core.c
@@ -105,12 +105,12 @@ static int dwc_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	if (state->enabled) {
 		if (!pwm->state.enabled)
-			pm_runtime_get_sync(chip->dev);
+			pm_runtime_get_sync(pwmchip_parent(chip));
 		return __dwc_pwm_configure_timer(dwc, pwm, state);
 	} else {
 		if (pwm->state.enabled) {
 			__dwc_pwm_set_enable(dwc, pwm->hwpwm, false);
-			pm_runtime_put_sync(chip->dev);
+			pm_runtime_put_sync(pwmchip_parent(chip));
 		}
 	}
 
@@ -124,7 +124,7 @@ static int dwc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 	u64 duty, period;
 	u32 ctrl, ld, ld2;
 
-	pm_runtime_get_sync(chip->dev);
+	pm_runtime_get_sync(pwmchip_parent(chip));
 
 	ctrl = dwc_pwm_readl(dwc, DWC_TIM_CTRL(pwm->hwpwm));
 	ld = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT(pwm->hwpwm));
@@ -149,7 +149,7 @@ static int dwc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 	state->period = period;
 	state->duty_cycle = duty;
 
-	pm_runtime_put_sync(chip->dev);
+	pm_runtime_put_sync(pwmchip_parent(chip));
 
 	return 0;
 }
-- 
2.42.0

[PATCH v4 015/115] pwm: ep93xx: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-ep93xx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pwm/pwm-ep93xx.c b/drivers/pwm/pwm-ep93xx.c
index 51e072572a87..e4c3546a61c8 100644
--- a/drivers/pwm/pwm-ep93xx.c
+++ b/drivers/pwm/pwm-ep93xx.c
@@ -46,14 +46,14 @@ static inline struct ep93xx_pwm *to_ep93xx_pwm(struct pwm_chip *chip)
 
 static int ep93xx_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	struct platform_device *pdev = to_platform_device(chip->dev);
+	struct platform_device *pdev = to_platform_device(pwmchip_parent(chip));
 
 	return ep93xx_pwm_acquire_gpio(pdev);
 }
 
 static void ep93xx_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	struct platform_device *pdev = to_platform_device(chip->dev);
+	struct platform_device *pdev = to_platform_device(pwmchip_parent(chip));
 
 	ep93xx_pwm_release_gpio(pdev);
 }
-- 
2.42.0

[PATCH v4 016/115] pwm: fsl-ftm: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-fsl-ftm.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/pwm/pwm-fsl-ftm.c b/drivers/pwm/pwm-fsl-ftm.c
index d1b6d1aa4773..47f1f5ac39cf 100644
--- a/drivers/pwm/pwm-fsl-ftm.c
+++ b/drivers/pwm/pwm-fsl-ftm.c
@@ -221,10 +221,11 @@ static bool fsl_pwm_is_other_pwm_enabled(struct fsl_pwm_chip *fpc,
 		return false;
 }
 
-static int fsl_pwm_apply_config(struct fsl_pwm_chip *fpc,
+static int fsl_pwm_apply_config(struct pwm_chip *chip,
 				struct pwm_device *pwm,
 				const struct pwm_state *newstate)
 {
+	struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
 	unsigned int duty;
 	u32 reg_polarity;
 
@@ -232,7 +233,7 @@ static int fsl_pwm_apply_config(struct fsl_pwm_chip *fpc,
 	bool do_write_period = false;
 
 	if (!fsl_pwm_calculate_period(fpc, newstate->period, &periodcfg)) {
-		dev_err(fpc->chip.dev, "failed to calculate new period\n");
+		dev_err(pwmchip_parent(chip), "failed to calculate new period\n");
 		return -EINVAL;
 	}
 
@@ -246,7 +247,7 @@ static int fsl_pwm_apply_config(struct fsl_pwm_chip *fpc,
 	 */
 	else if (!fsl_pwm_periodcfg_are_equal(&fpc->period, &periodcfg)) {
 		if (fsl_pwm_is_other_pwm_enabled(fpc, pwm)) {
-			dev_err(fpc->chip.dev,
+			dev_err(pwmchip_parent(chip),
 				"Cannot change period for PWM %u, disable other PWMs first\n",
 				pwm->hwpwm);
 			return -EBUSY;
@@ -322,7 +323,7 @@ static int fsl_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 		goto end_mutex;
 	}
 
-	ret = fsl_pwm_apply_config(fpc, pwm, newstate);
+	ret = fsl_pwm_apply_config(chip, pwm, newstate);
 	if (ret)
 		goto end_mutex;
 
-- 
2.42.0

[PATCH v4 017/115] pwm: img: Make use of parent device pointer in driver data

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, make use of the
already existing pointer to the parent device in driver data.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-img.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/pwm/pwm-img.c b/drivers/pwm/pwm-img.c
index 5965ac35b32e..2d7477fc391a 100644
--- a/drivers/pwm/pwm-img.c
+++ b/drivers/pwm/pwm-img.c
@@ -99,7 +99,7 @@ static int img_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	if (period_ns < imgchip->min_period_ns ||
 	    period_ns > imgchip->max_period_ns) {
-		dev_err(chip->dev, "configured period not in range\n");
+		dev_err(imgchip->dev, "configured period not in range\n");
 		return -ERANGE;
 	}
 
@@ -120,14 +120,14 @@ static int img_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 		div = PWM_CTRL_CFG_SUB_DIV0_DIV1;
 		timebase = DIV_ROUND_UP(mul, 512);
 	} else {
-		dev_err(chip->dev,
+		dev_err(imgchip->dev,
 			"failed to configure timebase steps/divider value\n");
 		return -EINVAL;
 	}
 
 	duty = DIV_ROUND_UP(timebase * duty_ns, period_ns);
 
-	ret = pm_runtime_resume_and_get(chip->dev);
+	ret = pm_runtime_resume_and_get(imgchip->dev);
 	if (ret < 0)
 		return ret;
 
@@ -141,8 +141,8 @@ static int img_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	      (timebase << PWM_CH_CFG_TMBASE_SHIFT);
 	img_pwm_writel(imgchip, PWM_CH_CFG(pwm->hwpwm), val);
 
-	pm_runtime_mark_last_busy(chip->dev);
-	pm_runtime_put_autosuspend(chip->dev);
+	pm_runtime_mark_last_busy(imgchip->dev);
+	pm_runtime_put_autosuspend(imgchip->dev);
 
 	return 0;
 }
@@ -153,7 +153,7 @@ static int img_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 	struct img_pwm_chip *imgchip = to_img_pwm_chip(chip);
 	int ret;
 
-	ret = pm_runtime_resume_and_get(chip->dev);
+	ret = pm_runtime_resume_and_get(imgchip->dev);
 	if (ret < 0)
 		return ret;
 
@@ -177,8 +177,8 @@ static void img_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 	val &= ~BIT(pwm->hwpwm);
 	img_pwm_writel(imgchip, PWM_CTRL_CFG, val);
 
-	pm_runtime_mark_last_busy(chip->dev);
-	pm_runtime_put_autosuspend(chip->dev);
+	pm_runtime_mark_last_busy(imgchip->dev);
+	pm_runtime_put_autosuspend(imgchip->dev);
 }
 
 static int img_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
-- 
2.42.0

[PATCH v4 018/115] pwm: imx27: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-imx27.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/pwm/pwm-imx27.c b/drivers/pwm/pwm-imx27.c
index 7d9bc43f12b0..5d796453519a 100644
--- a/drivers/pwm/pwm-imx27.c
+++ b/drivers/pwm/pwm-imx27.c
@@ -145,7 +145,7 @@ static int pwm_imx27_get_state(struct pwm_chip *chip,
 		state->polarity = PWM_POLARITY_INVERSED;
 		break;
 	default:
-		dev_warn(chip->dev, "can't set polarity, output disconnected");
+		dev_warn(pwmchip_parent(chip), "can't set polarity, output disconnected");
 	}
 
 	prescaler = MX3_PWMCR_PRESCALER_GET(val);
@@ -177,7 +177,7 @@ static int pwm_imx27_get_state(struct pwm_chip *chip,
 static void pwm_imx27_sw_reset(struct pwm_chip *chip)
 {
 	struct pwm_imx27_chip *imx = to_pwm_imx27_chip(chip);
-	struct device *dev = chip->dev;
+	struct device *dev = pwmchip_parent(chip);
 	int wait_count = 0;
 	u32 cr;
 
@@ -196,7 +196,7 @@ static void pwm_imx27_wait_fifo_slot(struct pwm_chip *chip,
 				     struct pwm_device *pwm)
 {
 	struct pwm_imx27_chip *imx = to_pwm_imx27_chip(chip);
-	struct device *dev = chip->dev;
+	struct device *dev = pwmchip_parent(chip);
 	unsigned int period_ms;
 	int fifoav;
 	u32 sr;
-- 
2.42.0

[PATCH v4 019/115] pwm: jz4740: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Acked-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-jz4740.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
index 80dcff237a15..36763134cd87 100644
--- a/drivers/pwm/pwm-jz4740.c
+++ b/drivers/pwm/pwm-jz4740.c
@@ -35,13 +35,12 @@ static inline struct jz4740_pwm_chip *to_jz4740(struct pwm_chip *chip)
 	return container_of(chip, struct jz4740_pwm_chip, chip);
 }
 
-static bool jz4740_pwm_can_use_chn(struct jz4740_pwm_chip *jz,
-				   unsigned int channel)
+static bool jz4740_pwm_can_use_chn(struct pwm_chip *chip, unsigned int channel)
 {
 	/* Enable all TCU channels for PWM use by default except channels 0/1 */
-	u32 pwm_channels_mask = GENMASK(jz->chip.npwm - 1, 2);
+	u32 pwm_channels_mask = GENMASK(chip->npwm - 1, 2);
 
-	device_property_read_u32(jz->chip.dev->parent,
+	device_property_read_u32(pwmchip_parent(chip)->parent,
 				 "ingenic,pwm-channels-mask",
 				 &pwm_channels_mask);
 
@@ -55,14 +54,14 @@ static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 	char name[16];
 	int err;
 
-	if (!jz4740_pwm_can_use_chn(jz, pwm->hwpwm))
+	if (!jz4740_pwm_can_use_chn(chip, pwm->hwpwm))
 		return -EBUSY;
 
 	snprintf(name, sizeof(name), "timer%u", pwm->hwpwm);
 
-	clk = clk_get(chip->dev, name);
+	clk = clk_get(pwmchip_parent(chip), name);
 	if (IS_ERR(clk))
-		return dev_err_probe(chip->dev, PTR_ERR(clk),
+		return dev_err_probe(pwmchip_parent(chip), PTR_ERR(clk),
 				     "Failed to get clock\n");
 
 	err = clk_prepare_enable(clk);
@@ -149,7 +148,7 @@ static int jz4740_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	 */
 	rate = clk_round_rate(clk, tmp);
 	if (rate < 0) {
-		dev_err(chip->dev, "Unable to round rate: %ld\n", rate);
+		dev_err(pwmchip_parent(chip), "Unable to round rate: %ld\n", rate);
 		return rate;
 	}
 
@@ -170,7 +169,7 @@ static int jz4740_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	err = clk_set_rate(clk, rate);
 	if (err) {
-		dev_err(chip->dev, "Unable to set rate: %d\n", err);
+		dev_err(pwmchip_parent(chip), "Unable to set rate: %d\n", err);
 		return err;
 	}
 
-- 
2.42.0

[PATCH v4 020/115] pwm: lpc18xx-sct: Make use of parent device pointer in driver data

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, make use of the
already existing pointer to the parent device in driver data. However
rename the pointer to "parent" for consistency with other drivers.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-lpc18xx-sct.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/pwm/pwm-lpc18xx-sct.c b/drivers/pwm/pwm-lpc18xx-sct.c
index b3d4a955aa31..9e1db43a5171 100644
--- a/drivers/pwm/pwm-lpc18xx-sct.c
+++ b/drivers/pwm/pwm-lpc18xx-sct.c
@@ -92,7 +92,7 @@ struct lpc18xx_pwm_data {
 };
 
 struct lpc18xx_pwm_chip {
-	struct device *dev;
+	struct device *parent;
 	struct pwm_chip chip;
 	void __iomem *base;
 	struct clk *pwm_clk;
@@ -198,7 +198,7 @@ static int lpc18xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	if (period_ns < lpc18xx_pwm->min_period_ns ||
 	    period_ns > lpc18xx_pwm->max_period_ns) {
-		dev_err(chip->dev, "period %d not in range\n", period_ns);
+		dev_err(lpc18xx_pwm->parent, "period %d not in range\n", period_ns);
 		return -ERANGE;
 	}
 
@@ -214,7 +214,7 @@ static int lpc18xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	 */
 	if (requested_events > 2 && lpc18xx_pwm->period_ns != period_ns &&
 	    lpc18xx_pwm->period_ns) {
-		dev_err(chip->dev, "conflicting period requested for PWM %u\n",
+		dev_err(lpc18xx_pwm->parent, "conflicting period requested for PWM %u\n",
 			pwm->hwpwm);
 		mutex_unlock(&lpc18xx_pwm->period_lock);
 		return -EBUSY;
@@ -291,7 +291,7 @@ static int lpc18xx_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 				    LPC18XX_PWM_EVENT_MAX);
 
 	if (event >= LPC18XX_PWM_EVENT_MAX) {
-		dev_err(lpc18xx_pwm->dev,
+		dev_err(lpc18xx_pwm->parent,
 			"maximum number of simultaneous channels reached\n");
 		return -EBUSY;
 	}
@@ -360,7 +360,7 @@ static int lpc18xx_pwm_probe(struct platform_device *pdev)
 	if (!lpc18xx_pwm)
 		return -ENOMEM;
 
-	lpc18xx_pwm->dev = &pdev->dev;
+	lpc18xx_pwm->parent = &pdev->dev;
 
 	lpc18xx_pwm->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(lpc18xx_pwm->base))
-- 
2.42.0

[PATCH v4 021/115] pwm: lpss: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-lpss.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/pwm/pwm-lpss.c b/drivers/pwm/pwm-lpss.c
index a6ea3ce7e019..394c768f5a5f 100644
--- a/drivers/pwm/pwm-lpss.c
+++ b/drivers/pwm/pwm-lpss.c
@@ -106,7 +106,7 @@ static int pwm_lpss_wait_for_update(struct pwm_device *pwm)
 	 */
 	err = readl_poll_timeout(addr, val, !(val & PWM_SW_UPDATE), 40, ms);
 	if (err)
-		dev_err(pwm->chip->dev, "PWM_SW_UPDATE was not cleared\n");
+		dev_err(pwmchip_parent(pwm->chip), "PWM_SW_UPDATE was not cleared\n");
 
 	return err;
 }
@@ -114,7 +114,7 @@ static int pwm_lpss_wait_for_update(struct pwm_device *pwm)
 static inline int pwm_lpss_is_updating(struct pwm_device *pwm)
 {
 	if (pwm_lpss_read(pwm) & PWM_SW_UPDATE) {
-		dev_err(pwm->chip->dev, "PWM_SW_UPDATE is still set, skipping update\n");
+		dev_err(pwmchip_parent(pwm->chip), "PWM_SW_UPDATE is still set, skipping update\n");
 		return -EBUSY;
 	}
 
@@ -190,16 +190,16 @@ static int pwm_lpss_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	if (state->enabled) {
 		if (!pwm_is_enabled(pwm)) {
-			pm_runtime_get_sync(chip->dev);
+			pm_runtime_get_sync(pwmchip_parent(chip));
 			ret = pwm_lpss_prepare_enable(lpwm, pwm, state);
 			if (ret)
-				pm_runtime_put(chip->dev);
+				pm_runtime_put(pwmchip_parent(chip));
 		} else {
 			ret = pwm_lpss_prepare_enable(lpwm, pwm, state);
 		}
 	} else if (pwm_is_enabled(pwm)) {
 		pwm_lpss_write(pwm, pwm_lpss_read(pwm) & ~PWM_ENABLE);
-		pm_runtime_put(chip->dev);
+		pm_runtime_put(pwmchip_parent(chip));
 	}
 
 	return ret;
@@ -213,7 +213,7 @@ static int pwm_lpss_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 	unsigned long long base_unit, freq, on_time_div;
 	u32 ctrl;
 
-	pm_runtime_get_sync(chip->dev);
+	pm_runtime_get_sync(pwmchip_parent(chip));
 
 	base_unit_range = BIT(lpwm->info->base_unit_bits);
 
@@ -235,7 +235,7 @@ static int pwm_lpss_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 	state->polarity = PWM_POLARITY_NORMAL;
 	state->enabled = !!(ctrl & PWM_ENABLE);
 
-	pm_runtime_put(chip->dev);
+	pm_runtime_put(pwmchip_parent(chip));
 
 	return 0;
 }
-- 
2.42.0

[PATCH v4 022/115] pwm: mediatek: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-mediatek.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
index 17d290f847af..d7d1c326e8cf 100644
--- a/drivers/pwm/pwm-mediatek.c
+++ b/drivers/pwm/pwm-mediatek.c
@@ -150,7 +150,7 @@ static int pwm_mediatek_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	if (clkdiv > PWM_CLK_DIV_MAX) {
 		pwm_mediatek_clk_disable(chip, pwm);
-		dev_err(chip->dev, "period of %d ns not supported\n", period_ns);
+		dev_err(pwmchip_parent(chip), "period of %d ns not supported\n", period_ns);
 		return -EINVAL;
 	}
 
-- 
2.42.0

[PATCH v4 023/115] pwm: meson: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-meson.c | 38 +++++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index 5bea53243ed2..640d6fe63799 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -122,7 +122,7 @@ static int meson_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	struct meson_pwm *meson = to_meson_pwm(chip);
 	struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
-	struct device *dev = chip->dev;
+	struct device *dev = pwmchip_parent(chip);
 	int err;
 
 	err = clk_prepare_enable(channel->clk);
@@ -143,9 +143,10 @@ static void meson_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 	clk_disable_unprepare(channel->clk);
 }
 
-static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
+static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm,
 			  const struct pwm_state *state)
 {
+	struct meson_pwm *meson = to_meson_pwm(chip);
 	struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
 	unsigned int cnt, duty_cnt;
 	unsigned long fin_freq;
@@ -169,19 +170,19 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
 
 	fin_freq = clk_round_rate(channel->clk, freq);
 	if (fin_freq == 0) {
-		dev_err(meson->chip.dev, "invalid source clock frequency\n");
+		dev_err(pwmchip_parent(chip), "invalid source clock frequency\n");
 		return -EINVAL;
 	}
 
-	dev_dbg(meson->chip.dev, "fin_freq: %lu Hz\n", fin_freq);
+	dev_dbg(pwmchip_parent(chip), "fin_freq: %lu Hz\n", fin_freq);
 
 	cnt = div_u64(fin_freq * period, NSEC_PER_SEC);
 	if (cnt > 0xffff) {
-		dev_err(meson->chip.dev, "unable to get period cnt\n");
+		dev_err(pwmchip_parent(chip), "unable to get period cnt\n");
 		return -EINVAL;
 	}
 
-	dev_dbg(meson->chip.dev, "period=%llu cnt=%u\n", period, cnt);
+	dev_dbg(pwmchip_parent(chip), "period=%llu cnt=%u\n", period, cnt);
 
 	if (duty == period) {
 		channel->hi = cnt;
@@ -192,7 +193,7 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
 	} else {
 		duty_cnt = div_u64(fin_freq * duty, NSEC_PER_SEC);
 
-		dev_dbg(meson->chip.dev, "duty=%llu duty_cnt=%u\n", duty, duty_cnt);
+		dev_dbg(pwmchip_parent(chip), "duty=%llu duty_cnt=%u\n", duty, duty_cnt);
 
 		channel->hi = duty_cnt;
 		channel->lo = cnt - duty_cnt;
@@ -203,8 +204,9 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
 	return 0;
 }
 
-static void meson_pwm_enable(struct meson_pwm *meson, struct pwm_device *pwm)
+static void meson_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
+	struct meson_pwm *meson = to_meson_pwm(chip);
 	struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
 	struct meson_pwm_channel_data *channel_data;
 	unsigned long flags;
@@ -215,7 +217,7 @@ static void meson_pwm_enable(struct meson_pwm *meson, struct pwm_device *pwm)
 
 	err = clk_set_rate(channel->clk, channel->rate);
 	if (err)
-		dev_err(meson->chip.dev, "setting clock rate failed\n");
+		dev_err(pwmchip_parent(chip), "setting clock rate failed\n");
 
 	spin_lock_irqsave(&meson->lock, flags);
 
@@ -230,8 +232,9 @@ static void meson_pwm_enable(struct meson_pwm *meson, struct pwm_device *pwm)
 	spin_unlock_irqrestore(&meson->lock, flags);
 }
 
-static void meson_pwm_disable(struct meson_pwm *meson, struct pwm_device *pwm)
+static void meson_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
+	struct meson_pwm *meson = to_meson_pwm(chip);
 	unsigned long flags;
 	u32 value;
 
@@ -269,16 +272,16 @@ static int meson_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 			channel->hi = ~0;
 			channel->lo = 0;
 
-			meson_pwm_enable(meson, pwm);
+			meson_pwm_enable(chip, pwm);
 		} else {
-			meson_pwm_disable(meson, pwm);
+			meson_pwm_disable(chip, pwm);
 		}
 	} else {
-		err = meson_pwm_calc(meson, pwm, state);
+		err = meson_pwm_calc(chip, pwm, state);
 		if (err < 0)
 			return err;
 
-		meson_pwm_enable(meson, pwm);
+		meson_pwm_enable(chip, pwm);
 	}
 
 	return 0;
@@ -432,10 +435,11 @@ static const struct of_device_id meson_pwm_matches[] = {
 };
 MODULE_DEVICE_TABLE(of, meson_pwm_matches);
 
-static int meson_pwm_init_channels(struct meson_pwm *meson)
+static int meson_pwm_init_channels(struct pwm_chip *chip)
 {
+	struct meson_pwm *meson = to_meson_pwm(chip);
 	struct clk_parent_data mux_parent_data[MESON_MAX_MUX_PARENTS] = {};
-	struct device *dev = meson->chip.dev;
+	struct device *dev = pwmchip_parent(chip);
 	unsigned int i;
 	char name[255];
 	int err;
@@ -549,7 +553,7 @@ static int meson_pwm_probe(struct platform_device *pdev)
 
 	meson->data = of_device_get_match_data(&pdev->dev);
 
-	err = meson_pwm_init_channels(meson);
+	err = meson_pwm_init_channels(&meson->chip);
 	if (err < 0)
 		return err;
 
-- 
2.42.0

[PATCH v4 024/115] pwm: mtk-disp: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-mtk-disp.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c
index a72f7be36996..186aa5c04435 100644
--- a/drivers/pwm/pwm-mtk-disp.c
+++ b/drivers/pwm/pwm-mtk-disp.c
@@ -91,14 +91,14 @@ static int mtk_disp_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (!mdp->enabled) {
 		err = clk_prepare_enable(mdp->clk_main);
 		if (err < 0) {
-			dev_err(chip->dev, "Can't enable mdp->clk_main: %pe\n",
+			dev_err(pwmchip_parent(chip), "Can't enable mdp->clk_main: %pe\n",
 				ERR_PTR(err));
 			return err;
 		}
 
 		err = clk_prepare_enable(mdp->clk_mm);
 		if (err < 0) {
-			dev_err(chip->dev, "Can't enable mdp->clk_mm: %pe\n",
+			dev_err(pwmchip_parent(chip), "Can't enable mdp->clk_mm: %pe\n",
 				ERR_PTR(err));
 			clk_disable_unprepare(mdp->clk_main);
 			return err;
@@ -181,13 +181,13 @@ static int mtk_disp_pwm_get_state(struct pwm_chip *chip,
 
 	err = clk_prepare_enable(mdp->clk_main);
 	if (err < 0) {
-		dev_err(chip->dev, "Can't enable mdp->clk_main: %pe\n", ERR_PTR(err));
+		dev_err(pwmchip_parent(chip), "Can't enable mdp->clk_main: %pe\n", ERR_PTR(err));
 		return err;
 	}
 
 	err = clk_prepare_enable(mdp->clk_mm);
 	if (err < 0) {
-		dev_err(chip->dev, "Can't enable mdp->clk_mm: %pe\n", ERR_PTR(err));
+		dev_err(pwmchip_parent(chip), "Can't enable mdp->clk_mm: %pe\n", ERR_PTR(err));
 		clk_disable_unprepare(mdp->clk_main);
 		return err;
 	}
-- 
2.42.0

[PATCH v4 025/115] pwm: omap: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-omap-dmtimer.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c
index 13161e08dd6e..c7c7383f4b14 100644
--- a/drivers/pwm/pwm-omap-dmtimer.c
+++ b/drivers/pwm/pwm-omap-dmtimer.c
@@ -158,7 +158,7 @@ static int pwm_omap_dmtimer_config(struct pwm_chip *chip,
 	unsigned long clk_rate;
 	struct clk *fclk;
 
-	dev_dbg(chip->dev, "requested duty cycle: %d ns, period: %d ns\n",
+	dev_dbg(pwmchip_parent(chip), "requested duty cycle: %d ns, period: %d ns\n",
 		duty_ns, period_ns);
 
 	if (duty_ns == pwm_get_duty_cycle(pwm) &&
@@ -167,17 +167,17 @@ static int pwm_omap_dmtimer_config(struct pwm_chip *chip,
 
 	fclk = omap->pdata->get_fclk(omap->dm_timer);
 	if (!fclk) {
-		dev_err(chip->dev, "invalid pmtimer fclk\n");
+		dev_err(pwmchip_parent(chip), "invalid pmtimer fclk\n");
 		return -EINVAL;
 	}
 
 	clk_rate = clk_get_rate(fclk);
 	if (!clk_rate) {
-		dev_err(chip->dev, "invalid pmtimer fclk rate\n");
+		dev_err(pwmchip_parent(chip), "invalid pmtimer fclk rate\n");
 		return -EINVAL;
 	}
 
-	dev_dbg(chip->dev, "clk rate: %luHz\n", clk_rate);
+	dev_dbg(pwmchip_parent(chip), "clk rate: %luHz\n", clk_rate);
 
 	/*
 	 * Calculate the appropriate load and match values based on the
@@ -199,27 +199,27 @@ static int pwm_omap_dmtimer_config(struct pwm_chip *chip,
 	duty_cycles = pwm_omap_dmtimer_get_clock_cycles(clk_rate, duty_ns);
 
 	if (period_cycles < 2) {
-		dev_info(chip->dev,
+		dev_info(pwmchip_parent(chip),
 			 "period %d ns too short for clock rate %lu Hz\n",
 			 period_ns, clk_rate);
 		return -EINVAL;
 	}
 
 	if (duty_cycles < 1) {
-		dev_dbg(chip->dev,
+		dev_dbg(pwmchip_parent(chip),
 			"duty cycle %d ns is too short for clock rate %lu Hz\n",
 			duty_ns, clk_rate);
-		dev_dbg(chip->dev, "using minimum of 1 clock cycle\n");
+		dev_dbg(pwmchip_parent(chip), "using minimum of 1 clock cycle\n");
 		duty_cycles = 1;
 	} else if (duty_cycles >= period_cycles) {
-		dev_dbg(chip->dev,
+		dev_dbg(pwmchip_parent(chip),
 			"duty cycle %d ns is too long for period %d ns at clock rate %lu Hz\n",
 			duty_ns, period_ns, clk_rate);
-		dev_dbg(chip->dev, "using maximum of 1 clock cycle less than period\n");
+		dev_dbg(pwmchip_parent(chip), "using maximum of 1 clock cycle less than period\n");
 		duty_cycles = period_cycles - 1;
 	}
 
-	dev_dbg(chip->dev, "effective duty cycle: %lld ns, period: %lld ns\n",
+	dev_dbg(pwmchip_parent(chip), "effective duty cycle: %lld ns, period: %lld ns\n",
 		DIV_ROUND_CLOSEST_ULL((u64)NSEC_PER_SEC * duty_cycles,
 				      clk_rate),
 		DIV_ROUND_CLOSEST_ULL((u64)NSEC_PER_SEC * period_cycles,
@@ -231,7 +231,7 @@ static int pwm_omap_dmtimer_config(struct pwm_chip *chip,
 	omap->pdata->set_load(omap->dm_timer, load_value);
 	omap->pdata->set_match(omap->dm_timer, true, match_value);
 
-	dev_dbg(chip->dev, "load value: %#08x (%d), match value: %#08x (%d)\n",
+	dev_dbg(pwmchip_parent(chip), "load value: %#08x (%d), match value: %#08x (%d)\n",
 		load_value, load_value,	match_value, match_value);
 
 	return 0;
-- 
2.42.0

[PATCH v4 026/115] pwm: pca9685: Store parent device in driver data

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, store a pointer to
the parent device in driver data.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-pca9685.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c
index e79b1de8c4d8..04e713ef790f 100644
--- a/drivers/pwm/pwm-pca9685.c
+++ b/drivers/pwm/pwm-pca9685.c
@@ -79,6 +79,7 @@ struct pca9685 {
 	struct pwm_chip chip;
 	struct regmap *regmap;
 	struct mutex lock;
+	struct device *parent;
 	DECLARE_BITMAP(pwms_enabled, PCA9685_MAXCHAN + 1);
 #if IS_ENABLED(CONFIG_GPIOLIB)
 	struct gpio_chip gpio;
@@ -109,7 +110,7 @@ static bool pca9685_prescaler_can_change(struct pca9685 *pca, int channel)
 
 static int pca9685_read_reg(struct pca9685 *pca, unsigned int reg, unsigned int *val)
 {
-	struct device *dev = pca->chip.dev;
+	struct device *dev = pca->parent;
 	int err;
 
 	err = regmap_read(pca->regmap, reg, val);
@@ -121,7 +122,7 @@ static int pca9685_read_reg(struct pca9685 *pca, unsigned int reg, unsigned int
 
 static int pca9685_write_reg(struct pca9685 *pca, unsigned int reg, unsigned int val)
 {
-	struct device *dev = pca->chip.dev;
+	struct device *dev = pca->parent;
 	int err;
 
 	err = regmap_write(pca->regmap, reg, val);
@@ -251,7 +252,7 @@ static int pca9685_pwm_gpio_request(struct gpio_chip *gpio, unsigned int offset)
 
 	if (pca9685_pwm_test_and_set_inuse(pca, offset))
 		return -EBUSY;
-	pm_runtime_get_sync(pca->chip.dev);
+	pm_runtime_get_sync(pca->parent);
 	return 0;
 }
 
@@ -275,7 +276,7 @@ static void pca9685_pwm_gpio_free(struct gpio_chip *gpio, unsigned int offset)
 	struct pca9685 *pca = gpiochip_get_data(gpio);
 
 	pca9685_pwm_set_duty(pca, offset, 0);
-	pm_runtime_put(pca->chip.dev);
+	pm_runtime_put(pca->parent);
 	pca9685_pwm_clear_inuse(pca, offset);
 }
 
@@ -308,7 +309,7 @@ static int pca9685_pwm_gpio_direction_output(struct gpio_chip *gpio,
  */
 static int pca9685_pwm_gpio_probe(struct pca9685 *pca)
 {
-	struct device *dev = pca->chip.dev;
+	struct device *dev = pca->parent;
 
 	pca->gpio.label = dev_name(dev);
 	pca->gpio.parent = dev;
@@ -345,7 +346,7 @@ static inline int pca9685_pwm_gpio_probe(struct pca9685 *pca)
 
 static void pca9685_set_sleep_mode(struct pca9685 *pca, bool enable)
 {
-	struct device *dev = pca->chip.dev;
+	struct device *dev = pca->parent;
 	int err = regmap_update_bits(pca->regmap, PCA9685_MODE1,
 				     MODE1_SLEEP, enable ? MODE1_SLEEP : 0);
 	if (err) {
@@ -373,7 +374,7 @@ static int __pca9685_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	prescale = DIV_ROUND_CLOSEST_ULL(PCA9685_OSC_CLOCK_MHZ * state->period,
 					 PCA9685_COUNTER_RANGE * 1000) - 1;
 	if (prescale < PCA9685_PRESCALE_MIN || prescale > PCA9685_PRESCALE_MAX) {
-		dev_err(chip->dev, "pwm not changed: period out of bounds!\n");
+		dev_err(pca->parent, "pwm not changed: period out of bounds!\n");
 		return -EINVAL;
 	}
 
@@ -385,7 +386,7 @@ static int __pca9685_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	pca9685_read_reg(pca, PCA9685_PRESCALE, &val);
 	if (prescale != val) {
 		if (!pca9685_prescaler_can_change(pca, pwm->hwpwm)) {
-			dev_err(chip->dev,
+			dev_err(pca->parent,
 				"pwm not changed: periods of enabled pwms must match!\n");
 			return -EBUSY;
 		}
@@ -482,7 +483,7 @@ static int pca9685_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 		mutex_unlock(&pca->lock);
 	}
 
-	pm_runtime_get_sync(chip->dev);
+	pm_runtime_get_sync(pca->parent);
 
 	return 0;
 }
@@ -496,7 +497,7 @@ static void pca9685_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 	clear_bit(pwm->hwpwm, pca->pwms_enabled);
 	mutex_unlock(&pca->lock);
 
-	pm_runtime_put(chip->dev);
+	pm_runtime_put(pca->parent);
 	pca9685_pwm_clear_inuse(pca, pwm->hwpwm);
 }
 
@@ -570,6 +571,7 @@ static int pca9685_pwm_probe(struct i2c_client *client)
 	pca->chip.npwm = PCA9685_MAXCHAN + 1;
 
 	pca->chip.dev = &client->dev;
+	pca->parent = &client->dev;
 
 	ret = pwmchip_add(&pca->chip);
 	if (ret < 0)
-- 
2.42.0

[PATCH v4 027/115] pwm: raspberrypi-poe: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-raspberrypi-poe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-raspberrypi-poe.c b/drivers/pwm/pwm-raspberrypi-poe.c
index 1ad814fdec6b..f10e8a624c51 100644
--- a/drivers/pwm/pwm-raspberrypi-poe.c
+++ b/drivers/pwm/pwm-raspberrypi-poe.c
@@ -122,7 +122,7 @@ static int raspberrypi_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	ret = raspberrypi_pwm_set_property(rpipwm->firmware, RPI_PWM_CUR_DUTY_REG,
 					   duty_cycle);
 	if (ret) {
-		dev_err(chip->dev, "Failed to set duty cycle: %pe\n",
+		dev_err(pwmchip_parent(chip), "Failed to set duty cycle: %pe\n",
 			ERR_PTR(ret));
 		return ret;
 	}
-- 
2.42.0

[PATCH v4 028/115] pwm: rcar: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-rcar.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pwm/pwm-rcar.c b/drivers/pwm/pwm-rcar.c
index 13269f55fccf..4838762137d1 100644
--- a/drivers/pwm/pwm-rcar.c
+++ b/drivers/pwm/pwm-rcar.c
@@ -132,12 +132,12 @@ static int rcar_pwm_set_counter(struct rcar_pwm_chip *rp, int div, int duty_ns,
 
 static int rcar_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	return pm_runtime_get_sync(chip->dev);
+	return pm_runtime_get_sync(pwmchip_parent(chip));
 }
 
 static void rcar_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	pm_runtime_put(chip->dev);
+	pm_runtime_put(pwmchip_parent(chip));
 }
 
 static int rcar_pwm_enable(struct rcar_pwm_chip *rp)
-- 
2.42.0

[PATCH v4 029/115] pwm: rz-mtu3: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-rz-mtu3.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pwm/pwm-rz-mtu3.c b/drivers/pwm/pwm-rz-mtu3.c
index bdda315b3bd3..45d075560a21 100644
--- a/drivers/pwm/pwm-rz-mtu3.c
+++ b/drivers/pwm/pwm-rz-mtu3.c
@@ -274,7 +274,7 @@ static int rz_mtu3_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 	struct rz_mtu3_pwm_chip *rz_mtu3_pwm = to_rz_mtu3_pwm_chip(chip);
 	int rc;
 
-	rc = pm_runtime_resume_and_get(chip->dev);
+	rc = pm_runtime_resume_and_get(pwmchip_parent(chip));
 	if (rc)
 		return rc;
 
@@ -307,7 +307,7 @@ static int rz_mtu3_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 	}
 
 	state->polarity = PWM_POLARITY_NORMAL;
-	pm_runtime_put(chip->dev);
+	pm_runtime_put(pwmchip_parent(chip));
 
 	return 0;
 }
@@ -362,7 +362,7 @@ static int rz_mtu3_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (!pwm->state.enabled) {
 		int rc;
 
-		rc = pm_runtime_resume_and_get(chip->dev);
+		rc = pm_runtime_resume_and_get(pwmchip_parent(chip));
 		if (rc)
 			return rc;
 	}
@@ -399,7 +399,7 @@ static int rz_mtu3_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	/* If the PWM is not enabled, turn the clock off again to save power. */
 	if (!pwm->state.enabled)
-		pm_runtime_put(chip->dev);
+		pm_runtime_put(pwmchip_parent(chip));
 
 	return 0;
 }
-- 
2.42.0

[PATCH v4 030/115] pwm: samsung: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-samsung.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/pwm/pwm-samsung.c b/drivers/pwm/pwm-samsung.c
index 6e77302f7368..a97cae49406e 100644
--- a/drivers/pwm/pwm-samsung.c
+++ b/drivers/pwm/pwm-samsung.c
@@ -197,12 +197,12 @@ static unsigned long pwm_samsung_calc_tin(struct samsung_pwm_chip *our_chip,
 				return rate;
 		}
 
-		dev_warn(our_chip->chip.dev,
+		dev_warn(pwmchip_parent(&our_chip->chip),
 			"tclk of PWM %d is inoperational, using tdiv\n", chan);
 	}
 
 	rate = pwm_samsung_get_tin_rate(our_chip, chan);
-	dev_dbg(our_chip->chip.dev, "tin parent at %lu\n", rate);
+	dev_dbg(pwmchip_parent(&our_chip->chip), "tin parent at %lu\n", rate);
 
 	/*
 	 * Compare minimum PWM frequency that can be achieved with possible
@@ -232,7 +232,7 @@ static int pwm_samsung_request(struct pwm_chip *chip, struct pwm_device *pwm)
 	struct samsung_pwm_chip *our_chip = to_samsung_pwm_chip(chip);
 
 	if (!(our_chip->variant.output_mask & BIT(pwm->hwpwm))) {
-		dev_warn(chip->dev,
+		dev_warn(pwmchip_parent(chip),
 			"tried to request PWM channel %d without output\n",
 			pwm->hwpwm);
 		return -EINVAL;
@@ -326,12 +326,12 @@ static int __pwm_samsung_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 		period = NSEC_PER_SEC / period_ns;
 
-		dev_dbg(our_chip->chip.dev, "duty_ns=%d, period_ns=%d (%u)\n",
+		dev_dbg(pwmchip_parent(chip), "duty_ns=%d, period_ns=%d (%u)\n",
 						duty_ns, period_ns, period);
 
 		tin_rate = pwm_samsung_calc_tin(our_chip, pwm->hwpwm, period);
 
-		dev_dbg(our_chip->chip.dev, "tin_rate=%lu\n", tin_rate);
+		dev_dbg(pwmchip_parent(chip), "tin_rate=%lu\n", tin_rate);
 
 		tin_ns = NSEC_PER_SEC / tin_rate;
 		tcnt = period_ns / tin_ns;
@@ -355,8 +355,7 @@ static int __pwm_samsung_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	/* -1UL will give 100% duty. */
 	--tcmp;
 
-	dev_dbg(our_chip->chip.dev,
-				"tin_ns=%u, tcmp=%u/%u\n", tin_ns, tcmp, tcnt);
+	dev_dbg(pwmchip_parent(chip), "tin_ns=%u, tcmp=%u/%u\n", tin_ns, tcmp, tcnt);
 
 	/* Update PWM registers. */
 	writel(tcnt, our_chip->base + REG_TCNTB(pwm->hwpwm));
@@ -368,7 +367,7 @@ static int __pwm_samsung_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	 * shortly afer this update (before it autoreloaded the new values).
 	 */
 	if (oldtcmp == (u32) -1) {
-		dev_dbg(our_chip->chip.dev, "Forcing manual update");
+		dev_dbg(pwmchip_parent(chip), "Forcing manual update");
 		pwm_samsung_manual_update(our_chip, pwm);
 	}
 
@@ -509,7 +508,7 @@ MODULE_DEVICE_TABLE(of, samsung_pwm_matches);
 
 static int pwm_samsung_parse_dt(struct samsung_pwm_chip *our_chip)
 {
-	struct device_node *np = our_chip->chip.dev->of_node;
+	struct device_node *np = pwmchip_parent(&our_chip->chip)->of_node;
 	const struct of_device_id *match;
 	struct property *prop;
 	const __be32 *cur;
@@ -523,7 +522,7 @@ static int pwm_samsung_parse_dt(struct samsung_pwm_chip *our_chip)
 
 	of_property_for_each_u32(np, "samsung,pwm-outputs", prop, cur, val) {
 		if (val >= SAMSUNG_PWM_NUM) {
-			dev_err(our_chip->chip.dev,
+			dev_err(pwmchip_parent(&our_chip->chip),
 				"%s: invalid channel index in samsung,pwm-outputs property\n",
 								__func__);
 			continue;
-- 
2.42.0

[PATCH v4 031/115] pwm: sifive: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-sifive.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pwm/pwm-sifive.c b/drivers/pwm/pwm-sifive.c
index 089e50bdbbf0..c1b412905d9e 100644
--- a/drivers/pwm/pwm-sifive.c
+++ b/drivers/pwm/pwm-sifive.c
@@ -102,7 +102,7 @@ static void pwm_sifive_update_clock(struct pwm_sifive_ddata *ddata,
 	/* As scale <= 15 the shift operation cannot overflow. */
 	num = (unsigned long long)NSEC_PER_SEC << (PWM_SIFIVE_CMPWIDTH + scale);
 	ddata->real_period = div64_ul(num, rate);
-	dev_dbg(ddata->chip.dev,
+	dev_dbg(pwmchip_parent(&ddata->chip),
 		"New real_period = %u ns\n", ddata->real_period);
 }
 
@@ -185,7 +185,7 @@ static int pwm_sifive_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (!enabled) {
 		ret = clk_enable(ddata->clk);
 		if (ret) {
-			dev_err(ddata->chip.dev, "Enable clk failed\n");
+			dev_err(pwmchip_parent(chip), "Enable clk failed\n");
 			return ret;
 		}
 	}
-- 
2.42.0

[PATCH v4 032/115] pwm: stm32-lp: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-stm32-lp.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/pwm/pwm-stm32-lp.c b/drivers/pwm/pwm-stm32-lp.c
index 439068f3eca1..3754faeca838 100644
--- a/drivers/pwm/pwm-stm32-lp.c
+++ b/drivers/pwm/pwm-stm32-lp.c
@@ -61,7 +61,7 @@ static int stm32_pwm_lp_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	do_div(div, NSEC_PER_SEC);
 	if (!div) {
 		/* Clock is too slow to achieve requested period. */
-		dev_dbg(priv->chip.dev, "Can't reach %llu ns\n", state->period);
+		dev_dbg(pwmchip_parent(chip), "Can't reach %llu ns\n", state->period);
 		return -EINVAL;
 	}
 
@@ -69,7 +69,7 @@ static int stm32_pwm_lp_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	while (div > STM32_LPTIM_MAX_ARR) {
 		presc++;
 		if ((1 << presc) > STM32_LPTIM_MAX_PRESCALER) {
-			dev_err(priv->chip.dev, "max prescaler exceeded\n");
+			dev_err(pwmchip_parent(chip), "max prescaler exceeded\n");
 			return -EINVAL;
 		}
 		div = prd >> presc;
@@ -130,7 +130,7 @@ static int stm32_pwm_lp_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 				       (val & STM32_LPTIM_CMPOK_ARROK) == STM32_LPTIM_CMPOK_ARROK,
 				       100, 1000);
 	if (ret) {
-		dev_err(priv->chip.dev, "ARR/CMP registers write issue\n");
+		dev_err(pwmchip_parent(chip), "ARR/CMP registers write issue\n");
 		goto err;
 	}
 	ret = regmap_write(priv->regmap, STM32_LPTIM_ICR,
-- 
2.42.0

[PATCH v4 033/115] pwm: stm32: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-stm32.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c
index 5f10cba492ec..d1dc9e3ca2a1 100644
--- a/drivers/pwm/pwm-stm32.c
+++ b/drivers/pwm/pwm-stm32.c
@@ -94,7 +94,7 @@ static int stm32_pwm_raw_capture(struct stm32_pwm *priv, struct pwm_device *pwm,
 				 unsigned long tmo_ms, u32 *raw_prd,
 				 u32 *raw_dty)
 {
-	struct device *parent = priv->chip.dev->parent;
+	struct device *parent = pwmchip_parent(&priv->chip)->parent;
 	enum stm32_timers_dmas dma_id;
 	u32 ccen, ccr;
 	int ret;
@@ -170,7 +170,7 @@ static int stm32_pwm_capture(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	ret = clk_enable(priv->clk);
 	if (ret) {
-		dev_err(priv->chip.dev, "failed to enable counter clock\n");
+		dev_err(pwmchip_parent(chip), "failed to enable counter clock\n");
 		goto unlock;
 	}
 
-- 
2.42.0

[PATCH v4 034/115] pwm: stmpe: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-stmpe.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/pwm/pwm-stmpe.c b/drivers/pwm/pwm-stmpe.c
index d730631c6583..941b1e218e35 100644
--- a/drivers/pwm/pwm-stmpe.c
+++ b/drivers/pwm/pwm-stmpe.c
@@ -44,7 +44,7 @@ static int stmpe_24xx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = stmpe_reg_read(stmpe_pwm->stmpe, STMPE24XX_PWMCS);
 	if (ret < 0) {
-		dev_err(chip->dev, "error reading PWM#%u control\n",
+		dev_err(pwmchip_parent(chip), "error reading PWM#%u control\n",
 			pwm->hwpwm);
 		return ret;
 	}
@@ -53,7 +53,7 @@ static int stmpe_24xx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = stmpe_reg_write(stmpe_pwm->stmpe, STMPE24XX_PWMCS, value);
 	if (ret) {
-		dev_err(chip->dev, "error writing PWM#%u control\n",
+		dev_err(pwmchip_parent(chip), "error writing PWM#%u control\n",
 			pwm->hwpwm);
 		return ret;
 	}
@@ -70,7 +70,7 @@ static int stmpe_24xx_pwm_disable(struct pwm_chip *chip,
 
 	ret = stmpe_reg_read(stmpe_pwm->stmpe, STMPE24XX_PWMCS);
 	if (ret < 0) {
-		dev_err(chip->dev, "error reading PWM#%u control\n",
+		dev_err(pwmchip_parent(chip), "error reading PWM#%u control\n",
 			pwm->hwpwm);
 		return ret;
 	}
@@ -79,7 +79,7 @@ static int stmpe_24xx_pwm_disable(struct pwm_chip *chip,
 
 	ret = stmpe_reg_write(stmpe_pwm->stmpe, STMPE24XX_PWMCS, value);
 	if (ret)
-		dev_err(chip->dev, "error writing PWM#%u control\n",
+		dev_err(pwmchip_parent(chip), "error writing PWM#%u control\n",
 			pwm->hwpwm);
 	return ret;
 }
@@ -125,7 +125,7 @@ static int stmpe_24xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 		ret = stmpe_set_altfunc(stmpe_pwm->stmpe, BIT(pin),
 					STMPE_BLOCK_PWM);
 		if (ret) {
-			dev_err(chip->dev, "unable to connect PWM#%u to pin\n",
+			dev_err(pwmchip_parent(chip), "unable to connect PWM#%u to pin\n",
 				pwm->hwpwm);
 			return ret;
 		}
@@ -150,7 +150,7 @@ static int stmpe_24xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 		return -ENODEV;
 	}
 
-	dev_dbg(chip->dev, "PWM#%u: config duty %d ns, period %d ns\n",
+	dev_dbg(pwmchip_parent(chip), "PWM#%u: config duty %d ns, period %d ns\n",
 		pwm->hwpwm, duty_ns, period_ns);
 
 	if (duty_ns == 0) {
@@ -216,7 +216,7 @@ static int stmpe_24xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 			program[1] = BRANCH;
 		}
 
-		dev_dbg(chip->dev,
+		dev_dbg(pwmchip_parent(chip),
 			"PWM#%u: value = %02x, last_duty = %02x, program=%04x,%04x,%04x\n",
 			pwm->hwpwm, value, last, program[0], program[1],
 			program[2]);
@@ -233,7 +233,7 @@ static int stmpe_24xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 		ret = stmpe_reg_write(stmpe_pwm->stmpe, offset, value);
 		if (ret) {
-			dev_err(chip->dev, "error writing register %02x: %d\n",
+			dev_err(pwmchip_parent(chip), "error writing register %02x: %d\n",
 				offset, ret);
 			return ret;
 		}
@@ -242,7 +242,7 @@ static int stmpe_24xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 		ret = stmpe_reg_write(stmpe_pwm->stmpe, offset, value);
 		if (ret) {
-			dev_err(chip->dev, "error writing register %02x: %d\n",
+			dev_err(pwmchip_parent(chip), "error writing register %02x: %d\n",
 				offset, ret);
 			return ret;
 		}
@@ -255,7 +255,7 @@ static int stmpe_24xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	/* Sleep for 200ms so we're sure it will take effect */
 	msleep(200);
 
-	dev_dbg(chip->dev, "programmed PWM#%u, %u bytes\n", pwm->hwpwm, i);
+	dev_dbg(pwmchip_parent(chip), "programmed PWM#%u, %u bytes\n", pwm->hwpwm, i);
 
 	return 0;
 }
-- 
2.42.0

[PATCH v4 035/115] pwm: sun4i: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-sun4i.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c
index 1a439025540d..44edf1ce5739 100644
--- a/drivers/pwm/pwm-sun4i.c
+++ b/drivers/pwm/pwm-sun4i.c
@@ -245,7 +245,7 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (!cstate.enabled) {
 		ret = clk_prepare_enable(sun4i_pwm->clk);
 		if (ret) {
-			dev_err(chip->dev, "failed to enable PWM clock\n");
+			dev_err(pwmchip_parent(chip), "failed to enable PWM clock\n");
 			return ret;
 		}
 	}
@@ -253,7 +253,7 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	ret = sun4i_pwm_calculate(sun4i_pwm, state, &duty, &period, &prescaler,
 				  &bypass);
 	if (ret) {
-		dev_err(chip->dev, "period exceeds the maximum value\n");
+		dev_err(pwmchip_parent(chip), "period exceeds the maximum value\n");
 		if (!cstate.enabled)
 			clk_disable_unprepare(sun4i_pwm->clk);
 		return ret;
-- 
2.42.0

[PATCH v4 036/115] pwm: tiecap: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-tiecap.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
index d974f4414ac9..8c4f67774f24 100644
--- a/drivers/pwm/pwm-tiecap.c
+++ b/drivers/pwm/pwm-tiecap.c
@@ -70,7 +70,7 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 		duty_cycles = (u32)c;
 	}
 
-	pm_runtime_get_sync(pc->chip.dev);
+	pm_runtime_get_sync(pwmchip_parent(chip));
 
 	value = readw(pc->mmio_base + ECCTL2);
 
@@ -100,7 +100,7 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 		writew(value, pc->mmio_base + ECCTL2);
 	}
 
-	pm_runtime_put_sync(pc->chip.dev);
+	pm_runtime_put_sync(pwmchip_parent(chip));
 
 	return 0;
 }
@@ -111,7 +111,7 @@ static int ecap_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
 	struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
 	u16 value;
 
-	pm_runtime_get_sync(pc->chip.dev);
+	pm_runtime_get_sync(pwmchip_parent(chip));
 
 	value = readw(pc->mmio_base + ECCTL2);
 
@@ -124,7 +124,7 @@ static int ecap_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	writew(value, pc->mmio_base + ECCTL2);
 
-	pm_runtime_put_sync(pc->chip.dev);
+	pm_runtime_put_sync(pwmchip_parent(chip));
 
 	return 0;
 }
@@ -135,7 +135,7 @@ static int ecap_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 	u16 value;
 
 	/* Leave clock enabled on enabling PWM */
-	pm_runtime_get_sync(pc->chip.dev);
+	pm_runtime_get_sync(pwmchip_parent(chip));
 
 	/*
 	 * Enable 'Free run Time stamp counter mode' to start counter
@@ -162,7 +162,7 @@ static void ecap_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 	writew(value, pc->mmio_base + ECCTL2);
 
 	/* Disable clock on PWM disable */
-	pm_runtime_put_sync(pc->chip.dev);
+	pm_runtime_put_sync(pwmchip_parent(chip));
 }
 
 static int ecap_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -271,11 +271,11 @@ static void ecap_pwm_remove(struct platform_device *pdev)
 
 static void ecap_pwm_save_context(struct ecap_pwm_chip *pc)
 {
-	pm_runtime_get_sync(pc->chip.dev);
+	pm_runtime_get_sync(pwmchip_parent(&pc->chip));
 	pc->ctx.ecctl2 = readw(pc->mmio_base + ECCTL2);
 	pc->ctx.cap4 = readl(pc->mmio_base + CAP4);
 	pc->ctx.cap3 = readl(pc->mmio_base + CAP3);
-	pm_runtime_put_sync(pc->chip.dev);
+	pm_runtime_put_sync(pwmchip_parent(&pc->chip));
 }
 
 static void ecap_pwm_restore_context(struct ecap_pwm_chip *pc)
-- 
2.42.0

[PATCH v4 037/115] pwm: tiehrpwm: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-tiehrpwm.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
index af231fa74fa9..80e22e373bc5 100644
--- a/drivers/pwm/pwm-tiehrpwm.c
+++ b/drivers/pwm/pwm-tiehrpwm.c
@@ -256,7 +256,7 @@ static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 			if (i == pwm->hwpwm)
 				continue;
 
-			dev_err(chip->dev,
+			dev_err(pwmchip_parent(chip),
 				"period value conflicts with channel %u\n",
 				i);
 			return -EINVAL;
@@ -268,11 +268,11 @@ static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	/* Configure clock prescaler to support Low frequency PWM wave */
 	if (set_prescale_div(period_cycles/PERIOD_MAX, &ps_divval,
 			     &tb_divval)) {
-		dev_err(chip->dev, "Unsupported values\n");
+		dev_err(pwmchip_parent(chip), "Unsupported values\n");
 		return -EINVAL;
 	}
 
-	pm_runtime_get_sync(chip->dev);
+	pm_runtime_get_sync(pwmchip_parent(chip));
 
 	/* Update clock prescaler values */
 	ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_CLKDIV_MASK, tb_divval);
@@ -299,7 +299,7 @@ static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	ehrpwm_write(pc->mmio_base, cmp_reg, duty_cycles);
 
-	pm_runtime_put_sync(chip->dev);
+	pm_runtime_put_sync(pwmchip_parent(chip));
 
 	return 0;
 }
@@ -323,7 +323,7 @@ static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 	int ret;
 
 	/* Leave clock enabled on enabling PWM */
-	pm_runtime_get_sync(chip->dev);
+	pm_runtime_get_sync(pwmchip_parent(chip));
 
 	/* Disabling Action Qualifier on PWM output */
 	if (pwm->hwpwm) {
@@ -346,8 +346,8 @@ static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 	/* Enable TBCLK */
 	ret = clk_enable(pc->tbclk);
 	if (ret) {
-		dev_err(chip->dev, "Failed to enable TBCLK for %s: %d\n",
-			dev_name(pc->chip.dev), ret);
+		dev_err(pwmchip_parent(chip), "Failed to enable TBCLK for %s: %d\n",
+			dev_name(pwmchip_parent(chip)), ret);
 		return ret;
 	}
 
@@ -385,7 +385,7 @@ static void ehrpwm_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 	clk_disable(pc->tbclk);
 
 	/* Disable clock on PWM disable */
-	pm_runtime_put_sync(chip->dev);
+	pm_runtime_put_sync(pwmchip_parent(chip));
 }
 
 static void ehrpwm_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -393,8 +393,8 @@ static void ehrpwm_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 	struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
 
 	if (pwm_is_enabled(pwm)) {
-		dev_warn(chip->dev, "Removing PWM device without disabling\n");
-		pm_runtime_put_sync(chip->dev);
+		dev_warn(pwmchip_parent(chip), "Removing PWM device without disabling\n");
+		pm_runtime_put_sync(pwmchip_parent(chip));
 	}
 
 	/* set period value to zero on free */
@@ -523,7 +523,7 @@ static void ehrpwm_pwm_remove(struct platform_device *pdev)
 
 static void ehrpwm_pwm_save_context(struct ehrpwm_pwm_chip *pc)
 {
-	pm_runtime_get_sync(pc->chip.dev);
+	pm_runtime_get_sync(pwmchip_parent(&pc->chip));
 
 	pc->ctx.tbctl = ehrpwm_read(pc->mmio_base, TBCTL);
 	pc->ctx.tbprd = ehrpwm_read(pc->mmio_base, TBPRD);
@@ -534,7 +534,7 @@ static void ehrpwm_pwm_save_context(struct ehrpwm_pwm_chip *pc)
 	pc->ctx.aqsfrc = ehrpwm_read(pc->mmio_base, AQSFRC);
 	pc->ctx.aqcsfrc = ehrpwm_read(pc->mmio_base, AQCSFRC);
 
-	pm_runtime_put_sync(pc->chip.dev);
+	pm_runtime_put_sync(pwmchip_parent(&pc->chip));
 }
 
 static void ehrpwm_pwm_restore_context(struct ehrpwm_pwm_chip *pc)
-- 
2.42.0

[PATCH v4 038/115] pwm: twl-led: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-twl-led.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/pwm/pwm-twl-led.c b/drivers/pwm/pwm-twl-led.c
index 8a870d0db3c6..51a2f34b0e0c 100644
--- a/drivers/pwm/pwm-twl-led.c
+++ b/drivers/pwm/pwm-twl-led.c
@@ -100,7 +100,7 @@ static int twl4030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	ret = twl_i2c_write(TWL4030_MODULE_LED, pwm_config, base, 2);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to configure PWM\n", pwm->label);
 
 	return ret;
 }
@@ -114,7 +114,7 @@ static int twl4030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL4030_MODULE_LED, &val, TWL4030_LEDEN_REG);
 	if (ret < 0) {
-		dev_err(chip->dev, "%s: Failed to read LEDEN\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to read LEDEN\n", pwm->label);
 		goto out;
 	}
 
@@ -122,7 +122,7 @@ static int twl4030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = twl_i2c_write_u8(TWL4030_MODULE_LED, val, TWL4030_LEDEN_REG);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);
 
 out:
 	mutex_unlock(&twl->mutex);
@@ -139,7 +139,7 @@ static void twl4030_pwmled_disable(struct pwm_chip *chip,
 	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL4030_MODULE_LED, &val, TWL4030_LEDEN_REG);
 	if (ret < 0) {
-		dev_err(chip->dev, "%s: Failed to read LEDEN\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to read LEDEN\n", pwm->label);
 		goto out;
 	}
 
@@ -147,7 +147,7 @@ static void twl4030_pwmled_disable(struct pwm_chip *chip,
 
 	ret = twl_i2c_write_u8(TWL4030_MODULE_LED, val, TWL4030_LEDEN_REG);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
 
 out:
 	mutex_unlock(&twl->mutex);
@@ -203,7 +203,7 @@ static int twl6030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, on_time,
 			       TWL6030_LED_PWM_CTRL1);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to configure PWM\n", pwm->label);
 
 	return ret;
 }
@@ -217,7 +217,7 @@ static int twl6030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
 	if (ret < 0) {
-		dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n",
+		dev_err(pwmchip_parent(chip), "%s: Failed to read PWM_CTRL2\n",
 			pwm->label);
 		goto out;
 	}
@@ -227,7 +227,7 @@ static int twl6030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);
 
 out:
 	mutex_unlock(&twl->mutex);
@@ -244,7 +244,7 @@ static void twl6030_pwmled_disable(struct pwm_chip *chip,
 	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
 	if (ret < 0) {
-		dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n",
+		dev_err(pwmchip_parent(chip), "%s: Failed to read PWM_CTRL2\n",
 			pwm->label);
 		goto out;
 	}
@@ -254,7 +254,7 @@ static void twl6030_pwmled_disable(struct pwm_chip *chip,
 
 	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
 
 out:
 	mutex_unlock(&twl->mutex);
@@ -295,7 +295,7 @@ static int twl6030_pwmled_request(struct pwm_chip *chip, struct pwm_device *pwm)
 	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
 	if (ret < 0) {
-		dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n",
+		dev_err(pwmchip_parent(chip), "%s: Failed to read PWM_CTRL2\n",
 			pwm->label);
 		goto out;
 	}
@@ -305,7 +305,7 @@ static int twl6030_pwmled_request(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to request PWM\n", pwm->label);
 
 out:
 	mutex_unlock(&twl->mutex);
@@ -321,7 +321,7 @@ static void twl6030_pwmled_free(struct pwm_chip *chip, struct pwm_device *pwm)
 	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
 	if (ret < 0) {
-		dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n",
+		dev_err(pwmchip_parent(chip), "%s: Failed to read PWM_CTRL2\n",
 			pwm->label);
 		goto out;
 	}
@@ -331,7 +331,7 @@ static void twl6030_pwmled_free(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to free PWM\n", pwm->label);
 
 out:
 	mutex_unlock(&twl->mutex);
-- 
2.42.0

[PATCH v4 039/115] pwm: twl: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-twl.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/pwm/pwm-twl.c b/drivers/pwm/pwm-twl.c
index 68e02c9a6bf9..7233ae039bdb 100644
--- a/drivers/pwm/pwm-twl.c
+++ b/drivers/pwm/pwm-twl.c
@@ -86,7 +86,7 @@ static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to configure PWM\n", pwm->label);
 
 	return ret;
 }
@@ -100,7 +100,7 @@ static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
 	if (ret < 0) {
-		dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to read GPBR1\n", pwm->label);
 		goto out;
 	}
 
@@ -108,13 +108,13 @@ static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);
 
 	val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
 
 	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);
 
 out:
 	mutex_unlock(&twl->mutex);
@@ -130,7 +130,7 @@ static void twl4030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
 	if (ret < 0) {
-		dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to read GPBR1\n", pwm->label);
 		goto out;
 	}
 
@@ -138,13 +138,13 @@ static void twl4030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
 
 	val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
 
 	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
 
 out:
 	mutex_unlock(&twl->mutex);
@@ -167,7 +167,7 @@ static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
 	if (ret < 0) {
-		dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to read PMBR1\n", pwm->label);
 		goto out;
 	}
 
@@ -181,7 +181,7 @@ static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to request PWM\n", pwm->label);
 
 out:
 	mutex_unlock(&twl->mutex);
@@ -202,7 +202,7 @@ static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 	mutex_lock(&twl->mutex);
 	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
 	if (ret < 0) {
-		dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to read PMBR1\n", pwm->label);
 		goto out;
 	}
 
@@ -212,7 +212,7 @@ static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
 	if (ret < 0)
-		dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to free PWM\n", pwm->label);
 
 out:
 	mutex_unlock(&twl->mutex);
@@ -231,7 +231,7 @@ static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
 	if (ret < 0) {
-		dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);
 		goto out;
 	}
 
@@ -254,7 +254,7 @@ static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
 	if (ret < 0) {
-		dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
 		goto out;
 	}
 
@@ -262,7 +262,7 @@ static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
 	if (ret < 0) {
-		dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
 		goto out;
 	}
 
@@ -270,7 +270,7 @@ static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
 	if (ret < 0) {
-		dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
+		dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
 		goto out;
 	}
 
-- 
2.42.0

[PATCH v4 040/115] pwm: vt8500: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-vt8500.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/pwm/pwm-vt8500.c b/drivers/pwm/pwm-vt8500.c
index bdea60389487..ff5e76afbddf 100644
--- a/drivers/pwm/pwm-vt8500.c
+++ b/drivers/pwm/pwm-vt8500.c
@@ -53,8 +53,9 @@ struct vt8500_chip {
 #define to_vt8500_chip(chip)	container_of(chip, struct vt8500_chip, chip)
 
 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
-static inline void vt8500_pwm_busy_wait(struct vt8500_chip *vt8500, int nr, u8 bitmask)
+static inline void vt8500_pwm_busy_wait(struct pwm_chip *chip, int nr, u8 bitmask)
 {
+	struct vt8500_chip *vt8500 = to_vt8500_chip(chip);
 	int loops = msecs_to_loops(10);
 	u32 mask = bitmask << (nr << 8);
 
@@ -62,7 +63,7 @@ static inline void vt8500_pwm_busy_wait(struct vt8500_chip *vt8500, int nr, u8 b
 		cpu_relax();
 
 	if (unlikely(!loops))
-		dev_warn(vt8500->chip.dev, "Waiting for status bits 0x%x to clear timed out\n",
+		dev_warn(pwmchip_parent(chip), "Waiting for status bits 0x%x to clear timed out\n",
 			 mask);
 }
 
@@ -77,7 +78,7 @@ static int vt8500_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	err = clk_enable(vt8500->clk);
 	if (err < 0) {
-		dev_err(chip->dev, "failed to enable clock\n");
+		dev_err(pwmchip_parent(chip), "failed to enable clock\n");
 		return err;
 	}
 
@@ -103,18 +104,18 @@ static int vt8500_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	dc = div64_u64(c, period_ns);
 
 	writel(prescale, vt8500->base + REG_SCALAR(pwm->hwpwm));
-	vt8500_pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_SCALAR_UPDATE);
+	vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_SCALAR_UPDATE);
 
 	writel(pv, vt8500->base + REG_PERIOD(pwm->hwpwm));
-	vt8500_pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_PERIOD_UPDATE);
+	vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_PERIOD_UPDATE);
 
 	writel(dc, vt8500->base + REG_DUTY(pwm->hwpwm));
-	vt8500_pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_DUTY_UPDATE);
+	vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_DUTY_UPDATE);
 
 	val = readl(vt8500->base + REG_CTRL(pwm->hwpwm));
 	val |= CTRL_AUTOLOAD;
 	writel(val, vt8500->base + REG_CTRL(pwm->hwpwm));
-	vt8500_pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_CTRL_UPDATE);
+	vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_CTRL_UPDATE);
 
 	clk_disable(vt8500->clk);
 	return 0;
@@ -128,14 +129,14 @@ static int vt8500_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 
 	err = clk_enable(vt8500->clk);
 	if (err < 0) {
-		dev_err(chip->dev, "failed to enable clock\n");
+		dev_err(pwmchip_parent(chip), "failed to enable clock\n");
 		return err;
 	}
 
 	val = readl(vt8500->base + REG_CTRL(pwm->hwpwm));
 	val |= CTRL_ENABLE;
 	writel(val, vt8500->base + REG_CTRL(pwm->hwpwm));
-	vt8500_pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_CTRL_UPDATE);
+	vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_CTRL_UPDATE);
 
 	return 0;
 }
@@ -148,7 +149,7 @@ static void vt8500_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 	val = readl(vt8500->base + REG_CTRL(pwm->hwpwm));
 	val &= ~CTRL_ENABLE;
 	writel(val, vt8500->base + REG_CTRL(pwm->hwpwm));
-	vt8500_pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_CTRL_UPDATE);
+	vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_CTRL_UPDATE);
 
 	clk_disable(vt8500->clk);
 }
@@ -168,7 +169,7 @@ static int vt8500_pwm_set_polarity(struct pwm_chip *chip,
 		val &= ~CTRL_INVERT;
 
 	writel(val, vt8500->base + REG_CTRL(pwm->hwpwm));
-	vt8500_pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_CTRL_UPDATE);
+	vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_CTRL_UPDATE);
 
 	return 0;
 }
-- 
2.42.0

[PATCH v4 041/115] staging: greybus: pwm: Make use of pwmchip_parent() macro

[Uwe Kleine-König]

struct pwm_chip::dev is about to change. To not have to touch this
driver in the same commit as struct pwm_chip::dev, use the macro
provided for exactly this purpose.

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/staging/greybus/pwm.c | 55 +++++++++++++++++------------------
 1 file changed, 26 insertions(+), 29 deletions(-)

diff --git a/drivers/staging/greybus/pwm.c b/drivers/staging/greybus/pwm.c
index a3cb68cfa0f9..75e0518791d8 100644
--- a/drivers/staging/greybus/pwm.c
+++ b/drivers/staging/greybus/pwm.c
@@ -17,7 +17,6 @@
 struct gb_pwm_chip {
 	struct gb_connection	*connection;
 	u8			pwm_max;	/* max pwm number */
-
 	struct pwm_chip		chip;
 };
 
@@ -39,9 +38,9 @@ static int gb_pwm_count_operation(struct gb_pwm_chip *pwmc)
 	return 0;
 }
 
-static int gb_pwm_activate_operation(struct gb_pwm_chip *pwmc,
-				     u8 which)
+static int gb_pwm_activate_operation(struct pwm_chip *chip, u8 which)
 {
+	struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
 	struct gb_pwm_activate_request request;
 	struct gbphy_device *gbphy_dev;
 	int ret;
@@ -51,7 +50,7 @@ static int gb_pwm_activate_operation(struct gb_pwm_chip *pwmc,
 
 	request.which = which;
 
-	gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
+	gbphy_dev = to_gbphy_dev(pwmchip_parent(chip));
 	ret = gbphy_runtime_get_sync(gbphy_dev);
 	if (ret)
 		return ret;
@@ -64,9 +63,10 @@ static int gb_pwm_activate_operation(struct gb_pwm_chip *pwmc,
 	return ret;
 }
 
-static int gb_pwm_deactivate_operation(struct gb_pwm_chip *pwmc,
+static int gb_pwm_deactivate_operation(struct pwm_chip *chip,
 				       u8 which)
 {
+	struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
 	struct gb_pwm_deactivate_request request;
 	struct gbphy_device *gbphy_dev;
 	int ret;
@@ -76,7 +76,7 @@ static int gb_pwm_deactivate_operation(struct gb_pwm_chip *pwmc,
 
 	request.which = which;
 
-	gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
+	gbphy_dev = to_gbphy_dev(pwmchip_parent(chip));
 	ret = gbphy_runtime_get_sync(gbphy_dev);
 	if (ret)
 		return ret;
@@ -89,9 +89,10 @@ static int gb_pwm_deactivate_operation(struct gb_pwm_chip *pwmc,
 	return ret;
 }
 
-static int gb_pwm_config_operation(struct gb_pwm_chip *pwmc,
+static int gb_pwm_config_operation(struct pwm_chip *chip,
 				   u8 which, u32 duty, u32 period)
 {
+	struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
 	struct gb_pwm_config_request request;
 	struct gbphy_device *gbphy_dev;
 	int ret;
@@ -103,7 +104,7 @@ static int gb_pwm_config_operation(struct gb_pwm_chip *pwmc,
 	request.duty = cpu_to_le32(duty);
 	request.period = cpu_to_le32(period);
 
-	gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
+	gbphy_dev = to_gbphy_dev(pwmchip_parent(chip));
 	ret = gbphy_runtime_get_sync(gbphy_dev);
 	if (ret)
 		return ret;
@@ -116,9 +117,10 @@ static int gb_pwm_config_operation(struct gb_pwm_chip *pwmc,
 	return ret;
 }
 
-static int gb_pwm_set_polarity_operation(struct gb_pwm_chip *pwmc,
+static int gb_pwm_set_polarity_operation(struct pwm_chip *chip,
 					 u8 which, u8 polarity)
 {
+	struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
 	struct gb_pwm_polarity_request request;
 	struct gbphy_device *gbphy_dev;
 	int ret;
@@ -129,7 +131,7 @@ static int gb_pwm_set_polarity_operation(struct gb_pwm_chip *pwmc,
 	request.which = which;
 	request.polarity = polarity;
 
-	gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
+	gbphy_dev = to_gbphy_dev(pwmchip_parent(chip));
 	ret = gbphy_runtime_get_sync(gbphy_dev);
 	if (ret)
 		return ret;
@@ -142,9 +144,9 @@ static int gb_pwm_set_polarity_operation(struct gb_pwm_chip *pwmc,
 	return ret;
 }
 
-static int gb_pwm_enable_operation(struct gb_pwm_chip *pwmc,
-				   u8 which)
+static int gb_pwm_enable_operation(struct pwm_chip *chip, u8 which)
 {
+	struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
 	struct gb_pwm_enable_request request;
 	struct gbphy_device *gbphy_dev;
 	int ret;
@@ -154,7 +156,7 @@ static int gb_pwm_enable_operation(struct gb_pwm_chip *pwmc,
 
 	request.which = which;
 
-	gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
+	gbphy_dev = to_gbphy_dev(pwmchip_parent(chip));
 	ret = gbphy_runtime_get_sync(gbphy_dev);
 	if (ret)
 		return ret;
@@ -167,9 +169,9 @@ static int gb_pwm_enable_operation(struct gb_pwm_chip *pwmc,
 	return ret;
 }
 
-static int gb_pwm_disable_operation(struct gb_pwm_chip *pwmc,
-				    u8 which)
+static int gb_pwm_disable_operation(struct pwm_chip *chip, u8 which)
 {
+	struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
 	struct gb_pwm_disable_request request;
 	struct gbphy_device *gbphy_dev;
 	int ret;
@@ -182,7 +184,7 @@ static int gb_pwm_disable_operation(struct gb_pwm_chip *pwmc,
 	ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_DISABLE,
 				&request, sizeof(request), NULL, 0);
 
-	gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
+	gbphy_dev = to_gbphy_dev(pwmchip_parent(chip));
 	gbphy_runtime_put_autosuspend(gbphy_dev);
 
 	return ret;
@@ -190,19 +192,15 @@ static int gb_pwm_disable_operation(struct gb_pwm_chip *pwmc,
 
 static int gb_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
-
-	return gb_pwm_activate_operation(pwmc, pwm->hwpwm);
+	return gb_pwm_activate_operation(chip, pwm->hwpwm);
 };
 
 static void gb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
-
 	if (pwm_is_enabled(pwm))
-		dev_warn(chip->dev, "freeing PWM device without disabling\n");
+		dev_warn(pwmchip_parent(chip), "freeing PWM device without disabling\n");
 
-	gb_pwm_deactivate_operation(pwmc, pwm->hwpwm);
+	gb_pwm_deactivate_operation(chip, pwm->hwpwm);
 }
 
 static int gb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -212,22 +210,21 @@ static int gb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	bool enabled = pwm->state.enabled;
 	u64 period = state->period;
 	u64 duty_cycle = state->duty_cycle;
-	struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
 
 	/* Set polarity */
 	if (state->polarity != pwm->state.polarity) {
 		if (enabled) {
-			gb_pwm_disable_operation(pwmc, pwm->hwpwm);
+			gb_pwm_disable_operation(chip, pwm->hwpwm);
 			enabled = false;
 		}
-		err = gb_pwm_set_polarity_operation(pwmc, pwm->hwpwm, state->polarity);
+		err = gb_pwm_set_polarity_operation(chip, pwm->hwpwm, state->polarity);
 		if (err)
 			return err;
 	}
 
 	if (!state->enabled) {
 		if (enabled)
-			gb_pwm_disable_operation(pwmc, pwm->hwpwm);
+			gb_pwm_disable_operation(chip, pwm->hwpwm);
 		return 0;
 	}
 
@@ -243,13 +240,13 @@ static int gb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (duty_cycle > period)
 		duty_cycle = period;
 
-	err = gb_pwm_config_operation(pwmc, pwm->hwpwm, duty_cycle, period);
+	err = gb_pwm_config_operation(chip, pwm->hwpwm, duty_cycle, period);
 	if (err)
 		return err;
 
 	/* enable/disable */
 	if (!enabled)
-		return gb_pwm_enable_operation(pwmc, pwm->hwpwm);
+		return gb_pwm_enable_operation(chip, pwm->hwpwm);
 
 	return 0;
 }
-- 
2.42.0

[PATCH v4 042/115] pwm: Provide wrappers for storing and getting driver private data

[Uwe Kleine-König]

These functions are useful to store and query driver private data a
After struct pwm_chip got its own struct device, this can make use of
dev_get_drvdata() and dev_set_drvdata() on that device.  These functions
are required already now to convert drivers to pwmchip_alloc() which
must happen before changing pwm_chip::dev.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 include/linux/pwm.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index e069900d1a36..e07b7a0c8471 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -300,6 +300,7 @@ struct pwm_chip {
 
 	/* only used internally by the PWM framework */
 	struct pwm_device *pwms;
+	void *driver_data;
 };
 
 static inline struct device *pwmchip_parent(struct pwm_chip *chip)
@@ -307,6 +308,24 @@ static inline struct device *pwmchip_parent(struct pwm_chip *chip)
 	return chip->dev;
 }
 
+static inline void *pwmchip_get_drvdata(struct pwm_chip *chip)
+{
+	/*
+	 * After pwm_chip got a dedicated struct device, this can be replaced by
+	 * dev_get_drvdata(&chip->dev);
+	 */
+	return chip->driver_data;
+}
+
+static inline void pwmchip_set_drvdata(struct pwm_chip *chip, void *data)
+{
+	/*
+	 * After pwm_chip got a dedicated struct device, this can be replaced by
+	 * dev_set_drvdata(&chip->dev, data);
+	 */
+	chip->driver_data = data;
+}
+
 #if IS_ENABLED(CONFIG_PWM)
 /* PWM user APIs */
 int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state);
-- 
2.42.0

[PATCH v4 043/115] pwm: Provide devm_pwmchip_alloc() function

[Uwe Kleine-König]

This function allocates a struct pwm_chip and driver data. Compared to
the status quo the split into pwm_chip and driver data is new, otherwise
it doesn't change anything relevant (yet).

The intention is that after all drivers are switched to use this
allocation function, its possible to add a struct device to struct
pwm_chip to properly track the latter's lifetime without touching all
drivers again. Proper lifetime tracking is a necessary precondition to
introduce character device support for PWMs (that implements atomic
setting and doesn't suffer from the sysfs overhead of the /sys/class/pwm
userspace support).

The new function pwmchip_priv() (obviously?) only works for chips
allocated with devm_pwmchip_alloc().

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 .../driver-api/driver-model/devres.rst        |  1 +
 Documentation/driver-api/pwm.rst              | 10 ++++----
 drivers/pwm/core.c                            | 25 +++++++++++++++++++
 include/linux/pwm.h                           |  3 +++
 4 files changed, 34 insertions(+), 5 deletions(-)

diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
index c5f99d834ec5..e4df72c408d2 100644
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -420,6 +420,7 @@ POWER
   devm_reboot_mode_unregister()
 
 PWM
+  devm_pwmchip_alloc()
   devm_pwmchip_add()
   devm_pwm_get()
   devm_fwnode_pwm_get()
diff --git a/Documentation/driver-api/pwm.rst b/Documentation/driver-api/pwm.rst
index bb264490a87a..994ea5368805 100644
--- a/Documentation/driver-api/pwm.rst
+++ b/Documentation/driver-api/pwm.rst
@@ -134,11 +134,11 @@ to implement the pwm_*() functions itself. This means that it's impossible
 to have multiple PWM drivers in the system. For this reason it's mandatory
 for new drivers to use the generic PWM framework.
 
-A new PWM controller/chip can be added using pwmchip_add() and removed
-again with pwmchip_remove(). pwmchip_add() takes a filled in struct
-pwm_chip as argument which provides a description of the PWM chip, the
-number of PWM devices provided by the chip and the chip-specific
-implementation of the supported PWM operations to the framework.
+A new PWM controller/chip can be allocated using devm_pwmchip_alloc, then added
+using pwmchip_add() and removed again with pwmchip_remove(). pwmchip_add()
+takes a filled in struct pwm_chip as argument which provides a description of
+the PWM chip, the number of PWM devices provided by the chip and the
+chip-specific implementation of the supported PWM operations to the framework.
 
 When implementing polarity support in a PWM driver, make sure to respect the
 signal conventions in the PWM framework. By definition, normal polarity
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index eea93ed8a49b..fda72963016b 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -198,6 +198,31 @@ static bool pwm_ops_check(const struct pwm_chip *chip)
 	return true;
 }
 
+static void *pwmchip_priv(struct pwm_chip *chip)
+{
+	return (void *)chip + sizeof(*chip);
+}
+
+struct pwm_chip *devm_pwmchip_alloc(struct device *parent, unsigned int npwm, size_t sizeof_priv)
+{
+	struct pwm_chip *chip;
+	size_t alloc_size;
+
+	alloc_size = size_add(sizeof(*chip), sizeof_priv);
+
+	chip = devm_kzalloc(parent, alloc_size, GFP_KERNEL);
+	if (!chip)
+		return ERR_PTR(-ENOMEM);
+
+	chip->dev = parent;
+	chip->npwm = npwm;
+
+	pwmchip_set_drvdata(chip, pwmchip_priv(chip));
+
+	return chip;
+}
+EXPORT_SYMBOL_GPL(devm_pwmchip_alloc);
+
 /**
  * __pwmchip_add() - register a new PWM chip
  * @chip: the PWM chip to add
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index e07b7a0c8471..b410ff38beb5 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -5,6 +5,7 @@
 #include <linux/err.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
+#include <linux/compiler_attributes.h>
 
 struct pwm_chip;
 
@@ -403,6 +404,8 @@ static inline void pwm_disable(struct pwm_device *pwm)
 int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result,
 		unsigned long timeout);
 
+struct pwm_chip *devm_pwmchip_alloc(struct device *parent, unsigned int npwm, size_t sizeof_priv);
+
 int __pwmchip_add(struct pwm_chip *chip, struct module *owner);
 #define pwmchip_add(chip) __pwmchip_add(chip, THIS_MODULE)
 void pwmchip_remove(struct pwm_chip *chip);
-- 
2.42.0

[PATCH v4 044/115] pwm: ab8500: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-ab8500 driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-ab8500.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-ab8500.c b/drivers/pwm/pwm-ab8500.c
index 719e4ccf1800..f000adab85b0 100644
--- a/drivers/pwm/pwm-ab8500.c
+++ b/drivers/pwm/pwm-ab8500.c
@@ -24,13 +24,12 @@
 #define AB8500_PWM_CLKRATE 9600000
 
 struct ab8500_pwm_chip {
-	struct pwm_chip chip;
 	unsigned int hwid;
 };
 
 static struct ab8500_pwm_chip *ab8500_pwm_from_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct ab8500_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int ab8500_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -185,6 +184,7 @@ static const struct pwm_ops ab8500_pwm_ops = {
 
 static int ab8500_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct ab8500_pwm_chip *ab8500;
 	int err;
 
@@ -195,16 +195,16 @@ static int ab8500_pwm_probe(struct platform_device *pdev)
 	 * Nothing to be done in probe, this is required to get the
 	 * device which is required for ab8500 read and write
 	 */
-	ab8500 = devm_kzalloc(&pdev->dev, sizeof(*ab8500), GFP_KERNEL);
-	if (ab8500 == NULL)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*ab8500));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
 
-	ab8500->chip.dev = &pdev->dev;
-	ab8500->chip.ops = &ab8500_pwm_ops;
-	ab8500->chip.npwm = 1;
+	ab8500 = ab8500_pwm_from_chip(chip);
+
+	chip->ops = &ab8500_pwm_ops;
 	ab8500->hwid = pdev->id - 1;
 
-	err = devm_pwmchip_add(&pdev->dev, &ab8500->chip);
+	err = devm_pwmchip_add(&pdev->dev, chip);
 	if (err < 0)
 		return dev_err_probe(&pdev->dev, err, "Failed to add pwm chip\n");
 
-- 
2.42.0

[PATCH v4 045/115] pwm: apple: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-apple driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-apple.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-apple.c b/drivers/pwm/pwm-apple.c
index 4d755b628d9e..6e58aca2f13c 100644
--- a/drivers/pwm/pwm-apple.c
+++ b/drivers/pwm/pwm-apple.c
@@ -32,14 +32,13 @@
 #define APPLE_PWM_CTRL_OUTPUT_ENABLE BIT(14)
 
 struct apple_pwm {
-	struct pwm_chip chip;
 	void __iomem *base;
 	u64 clkrate;
 };
 
 static inline struct apple_pwm *to_apple_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct apple_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int apple_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -103,13 +102,16 @@ static const struct pwm_ops apple_pwm_ops = {
 
 static int apple_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct apple_pwm *fpwm;
 	struct clk *clk;
 	int ret;
 
-	fpwm = devm_kzalloc(&pdev->dev, sizeof(*fpwm), GFP_KERNEL);
-	if (!fpwm)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*fpwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+
+	fpwm = to_apple_pwm(chip);
 
 	fpwm->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(fpwm->base))
@@ -129,11 +131,9 @@ static int apple_pwm_probe(struct platform_device *pdev)
 	if (fpwm->clkrate > NSEC_PER_SEC)
 		return dev_err_probe(&pdev->dev, -EINVAL, "pwm clock out of range");
 
-	fpwm->chip.dev = &pdev->dev;
-	fpwm->chip.npwm = 1;
-	fpwm->chip.ops = &apple_pwm_ops;
+	chip->ops = &apple_pwm_ops;
 
-	ret = devm_pwmchip_add(&pdev->dev, &fpwm->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0)
 		return dev_err_probe(&pdev->dev, ret, "unable to add pwm chip");
 
-- 
2.42.0

[PATCH v4 046/115] pwm: atmel-hlcdc: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-atme-hlcdc driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-atmel-hlcdc.c | 35 ++++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
index 3f2c5031a3ba..aa1b67b6f2ea 100644
--- a/drivers/pwm/pwm-atmel-hlcdc.c
+++ b/drivers/pwm/pwm-atmel-hlcdc.c
@@ -28,7 +28,6 @@ struct atmel_hlcdc_pwm_errata {
 };
 
 struct atmel_hlcdc_pwm {
-	struct pwm_chip chip;
 	struct atmel_hlcdc *hlcdc;
 	struct clk *cur_clk;
 	const struct atmel_hlcdc_pwm_errata *errata;
@@ -36,7 +35,7 @@ struct atmel_hlcdc_pwm {
 
 static inline struct atmel_hlcdc_pwm *to_atmel_hlcdc_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct atmel_hlcdc_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int atmel_hlcdc_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -182,10 +181,11 @@ static const struct atmel_hlcdc_pwm_errata atmel_hlcdc_pwm_sama5d3_errata = {
 
 static int atmel_hlcdc_pwm_suspend(struct device *dev)
 {
-	struct atmel_hlcdc_pwm *atmel = dev_get_drvdata(dev);
+	struct pwm_chip *chip = dev_get_drvdata(dev);
+	struct atmel_hlcdc_pwm *atmel = to_atmel_hlcdc_pwm(chip);
 
 	/* Keep the periph clock enabled if the PWM is still running. */
-	if (pwm_is_enabled(&atmel->chip.pwms[0]))
+	if (pwm_is_enabled(&chip->pwms[0]))
 		clk_disable_unprepare(atmel->hlcdc->periph_clk);
 
 	return 0;
@@ -193,11 +193,12 @@ static int atmel_hlcdc_pwm_suspend(struct device *dev)
 
 static int atmel_hlcdc_pwm_resume(struct device *dev)
 {
-	struct atmel_hlcdc_pwm *atmel = dev_get_drvdata(dev);
+	struct pwm_chip *chip = dev_get_drvdata(dev);
+	struct atmel_hlcdc_pwm *atmel = to_atmel_hlcdc_pwm(chip);
 	struct pwm_state state;
 	int ret;
 
-	pwm_get_state(&atmel->chip.pwms[0], &state);
+	pwm_get_state(&chip->pwms[0], &state);
 
 	/* Re-enable the periph clock it was stopped during suspend. */
 	if (!state.enabled) {
@@ -206,8 +207,7 @@ static int atmel_hlcdc_pwm_resume(struct device *dev)
 			return ret;
 	}
 
-	return atmel_hlcdc_pwm_apply(&atmel->chip, &atmel->chip.pwms[0],
-				     &state);
+	return atmel_hlcdc_pwm_apply(chip, &chip->pwms[0], &state);
 }
 
 static DEFINE_SIMPLE_DEV_PM_OPS(atmel_hlcdc_pwm_pm_ops,
@@ -243,15 +243,17 @@ static int atmel_hlcdc_pwm_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *match;
 	struct device *dev = &pdev->dev;
+	struct pwm_chip *chip;
 	struct atmel_hlcdc_pwm *atmel;
 	struct atmel_hlcdc *hlcdc;
 	int ret;
 
 	hlcdc = dev_get_drvdata(dev->parent);
 
-	atmel = devm_kzalloc(dev, sizeof(*atmel), GFP_KERNEL);
-	if (!atmel)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(dev, 1, sizeof(*atmel));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	atmel = to_atmel_hlcdc_pwm(chip);
 
 	ret = clk_prepare_enable(hlcdc->periph_clk);
 	if (ret)
@@ -262,11 +264,9 @@ static int atmel_hlcdc_pwm_probe(struct platform_device *pdev)
 		atmel->errata = match->data;
 
 	atmel->hlcdc = hlcdc;
-	atmel->chip.ops = &atmel_hlcdc_pwm_ops;
-	atmel->chip.dev = dev;
-	atmel->chip.npwm = 1;
+	chip->ops = &atmel_hlcdc_pwm_ops;
 
-	ret = pwmchip_add(&atmel->chip);
+	ret = pwmchip_add(chip);
 	if (ret) {
 		clk_disable_unprepare(hlcdc->periph_clk);
 		return ret;
@@ -279,9 +279,10 @@ static int atmel_hlcdc_pwm_probe(struct platform_device *pdev)
 
 static void atmel_hlcdc_pwm_remove(struct platform_device *pdev)
 {
-	struct atmel_hlcdc_pwm *atmel = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct atmel_hlcdc_pwm *atmel = to_atmel_hlcdc_pwm(chip);
 
-	pwmchip_remove(&atmel->chip);
+	pwmchip_remove(chip);
 
 	clk_disable_unprepare(atmel->hlcdc->periph_clk);
 }
-- 
2.42.0

[PATCH v4 047/115] pwm: atmel: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-atmel driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-atmel.c | 28 +++++++++++++---------------
 1 file changed, 13 insertions(+), 15 deletions(-)

diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index 4ef91fe6f147..ab84229161ef 100644
--- a/drivers/pwm/pwm-atmel.c
+++ b/drivers/pwm/pwm-atmel.c
@@ -77,7 +77,6 @@ struct atmel_pwm_data {
 };
 
 struct atmel_pwm_chip {
-	struct pwm_chip chip;
 	struct clk *clk;
 	void __iomem *base;
 	const struct atmel_pwm_data *data;
@@ -99,7 +98,7 @@ struct atmel_pwm_chip {
 
 static inline struct atmel_pwm_chip *to_atmel_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct atmel_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static inline u32 atmel_pwm_readl(struct atmel_pwm_chip *chip,
@@ -473,7 +472,7 @@ static int atmel_pwm_enable_clk_if_on(struct pwm_chip *chip, bool on)
 	if (!sr)
 		return 0;
 
-	cnt = bitmap_weight(&sr, atmel_pwm->chip.npwm);
+	cnt = bitmap_weight(&sr, chip->npwm);
 
 	if (!on)
 		goto disable_clk;
@@ -481,9 +480,8 @@ static int atmel_pwm_enable_clk_if_on(struct pwm_chip *chip, bool on)
 	for (i = 0; i < cnt; i++) {
 		ret = clk_enable(atmel_pwm->clk);
 		if (ret) {
-			dev_err(pwmchip_parent(chip),
-				"failed to enable clock for pwm %pe\n",
-				ERR_PTR(ret));
+			dev_err_probe(pwmchip_parent(chip), ret,
+				"failed to enable clock for pwm\n");
 
 			cnt = i;
 			goto disable_clk;
@@ -501,12 +499,14 @@ static int atmel_pwm_enable_clk_if_on(struct pwm_chip *chip, bool on)
 
 static int atmel_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct atmel_pwm_chip *atmel_pwm;
 	int ret;
 
-	atmel_pwm = devm_kzalloc(&pdev->dev, sizeof(*atmel_pwm), GFP_KERNEL);
-	if (!atmel_pwm)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 4, sizeof(*atmel_pwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	atmel_pwm = to_atmel_pwm_chip(chip);
 
 	atmel_pwm->data = of_device_get_match_data(&pdev->dev);
 
@@ -522,15 +522,13 @@ static int atmel_pwm_probe(struct platform_device *pdev)
 		return dev_err_probe(&pdev->dev, PTR_ERR(atmel_pwm->clk),
 				     "failed to get prepared PWM clock\n");
 
-	atmel_pwm->chip.dev = &pdev->dev;
-	atmel_pwm->chip.ops = &atmel_pwm_ops;
-	atmel_pwm->chip.npwm = 4;
+	chip->ops = &atmel_pwm_ops;
 
-	ret = atmel_pwm_enable_clk_if_on(&atmel_pwm->chip, true);
+	ret = atmel_pwm_enable_clk_if_on(chip, true);
 	if (ret < 0)
 		return ret;
 
-	ret = devm_pwmchip_add(&pdev->dev, &atmel_pwm->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0) {
 		dev_err_probe(&pdev->dev, ret, "failed to add PWM chip\n");
 		goto disable_clk;
@@ -539,7 +537,7 @@ static int atmel_pwm_probe(struct platform_device *pdev)
 	return 0;
 
 disable_clk:
-	atmel_pwm_enable_clk_if_on(&atmel_pwm->chip, false);
+	atmel_pwm_enable_clk_if_on(chip, false);
 
 	return ret;
 }
-- 
2.42.0

[PATCH v4 048/115] pwm: atmel-tcb: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-atmel-tcb driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-atmel-tcb.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c
index 80121ab81a01..0663685532ec 100644
--- a/drivers/pwm/pwm-atmel-tcb.c
+++ b/drivers/pwm/pwm-atmel-tcb.c
@@ -47,7 +47,6 @@ struct atmel_tcb_channel {
 };
 
 struct atmel_tcb_pwm_chip {
-	struct pwm_chip chip;
 	spinlock_t lock;
 	u8 channel;
 	u8 width;
@@ -63,7 +62,7 @@ static const u8 atmel_tcb_divisors[] = { 2, 8, 32, 128, 0, };
 
 static inline struct atmel_tcb_pwm_chip *to_tcb_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct atmel_tcb_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int atmel_tcb_pwm_request(struct pwm_chip *chip,
@@ -389,6 +388,7 @@ static const struct of_device_id atmel_tcb_of_match[] = {
 static int atmel_tcb_pwm_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *match;
+	struct pwm_chip *chip;
 	struct atmel_tcb_pwm_chip *tcbpwm;
 	const struct atmel_tcb_config *config;
 	struct device_node *np = pdev->dev.of_node;
@@ -396,9 +396,10 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
 	int err;
 	int channel;
 
-	tcbpwm = devm_kzalloc(&pdev->dev, sizeof(*tcbpwm), GFP_KERNEL);
-	if (tcbpwm == NULL)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, NPWM, sizeof(*tcbpwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	tcbpwm = to_tcb_chip(chip);
 
 	err = of_property_read_u32(np, "reg", &channel);
 	if (err < 0) {
@@ -436,9 +437,7 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
 		}
 	}
 
-	tcbpwm->chip.dev = &pdev->dev;
-	tcbpwm->chip.ops = &atmel_tcb_pwm_ops;
-	tcbpwm->chip.npwm = NPWM;
+	chip->ops = &atmel_tcb_pwm_ops;
 	tcbpwm->channel = channel;
 	tcbpwm->width = config->counter_width;
 
@@ -448,11 +447,11 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
 
 	spin_lock_init(&tcbpwm->lock);
 
-	err = pwmchip_add(&tcbpwm->chip);
+	err = pwmchip_add(chip);
 	if (err < 0)
 		goto err_disable_clk;
 
-	platform_set_drvdata(pdev, tcbpwm);
+	platform_set_drvdata(pdev, chip);
 
 	return 0;
 
@@ -473,9 +472,10 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
 
 static void atmel_tcb_pwm_remove(struct platform_device *pdev)
 {
-	struct atmel_tcb_pwm_chip *tcbpwm = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct atmel_tcb_pwm_chip *tcbpwm = to_tcb_chip(chip);
 
-	pwmchip_remove(&tcbpwm->chip);
+	pwmchip_remove(chip);
 
 	clk_disable_unprepare(tcbpwm->slow_clk);
 	clk_put(tcbpwm->gclk);
-- 
2.42.0

[PATCH v4 049/115] pwm: bcm2835: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-bcm2835 driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-bcm2835.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c
index ab30667f4f95..826f0494dc5f 100644
--- a/drivers/pwm/pwm-bcm2835.c
+++ b/drivers/pwm/pwm-bcm2835.c
@@ -24,7 +24,6 @@
 #define PERIOD_MIN		0x2
 
 struct bcm2835_pwm {
-	struct pwm_chip chip;
 	struct device *dev;
 	void __iomem *base;
 	struct clk *clk;
@@ -32,7 +31,7 @@ struct bcm2835_pwm {
 
 static inline struct bcm2835_pwm *to_bcm2835_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct bcm2835_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int bcm2835_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -133,12 +132,14 @@ static const struct pwm_ops bcm2835_pwm_ops = {
 
 static int bcm2835_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct bcm2835_pwm *pc;
 	int ret;
 
-	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
-	if (!pc)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 2, sizeof(*pc));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	pc = to_bcm2835_pwm(chip);
 
 	pc->dev = &pdev->dev;
 
@@ -151,13 +152,11 @@ static int bcm2835_pwm_probe(struct platform_device *pdev)
 		return dev_err_probe(&pdev->dev, PTR_ERR(pc->clk),
 				     "clock not found\n");
 
-	pc->chip.dev = &pdev->dev;
-	pc->chip.ops = &bcm2835_pwm_ops;
-	pc->chip.npwm = 2;
+	chip->ops = &bcm2835_pwm_ops;
 
 	platform_set_drvdata(pdev, pc);
 
-	ret = devm_pwmchip_add(&pdev->dev, &pc->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0)
 		return dev_err_probe(&pdev->dev, ret,
 				     "failed to add pwmchip\n");
-- 
2.42.0

[PATCH v4 050/115] pwm: bcm-iproc: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-bcm-iproc driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-bcm-iproc.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/pwm/pwm-bcm-iproc.c b/drivers/pwm/pwm-bcm-iproc.c
index 758254025683..f4c9f10e490e 100644
--- a/drivers/pwm/pwm-bcm-iproc.c
+++ b/drivers/pwm/pwm-bcm-iproc.c
@@ -34,14 +34,13 @@
 #define IPROC_PWM_PRESCALE_MAX			0x3f
 
 struct iproc_pwmc {
-	struct pwm_chip chip;
 	void __iomem *base;
 	struct clk *clk;
 };
 
 static inline struct iproc_pwmc *to_iproc_pwmc(struct pwm_chip *chip)
 {
-	return container_of(chip, struct iproc_pwmc, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static void iproc_pwmc_enable(struct iproc_pwmc *ip, unsigned int channel)
@@ -187,20 +186,20 @@ static const struct pwm_ops iproc_pwm_ops = {
 
 static int iproc_pwmc_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct iproc_pwmc *ip;
 	unsigned int i;
 	u32 value;
 	int ret;
 
-	ip = devm_kzalloc(&pdev->dev, sizeof(*ip), GFP_KERNEL);
-	if (!ip)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 4, sizeof(*ip));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	ip = to_iproc_pwmc(chip);
 
 	platform_set_drvdata(pdev, ip);
 
-	ip->chip.dev = &pdev->dev;
-	ip->chip.ops = &iproc_pwm_ops;
-	ip->chip.npwm = 4;
+	chip->ops = &iproc_pwm_ops;
 
 	ip->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(ip->base))
@@ -214,14 +213,14 @@ static int iproc_pwmc_probe(struct platform_device *pdev)
 	/* Set full drive and normal polarity for all channels */
 	value = readl(ip->base + IPROC_PWM_CTRL_OFFSET);
 
-	for (i = 0; i < ip->chip.npwm; i++) {
+	for (i = 0; i < chip->npwm; i++) {
 		value &= ~(1 << IPROC_PWM_CTRL_TYPE_SHIFT(i));
 		value |= 1 << IPROC_PWM_CTRL_POLARITY_SHIFT(i);
 	}
 
 	writel(value, ip->base + IPROC_PWM_CTRL_OFFSET);
 
-	ret = devm_pwmchip_add(&pdev->dev, &ip->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0)
 		return dev_err_probe(&pdev->dev, ret,
 				     "failed to add PWM chip\n");
-- 
2.42.0

[PATCH v4 051/115] pwm: bcm-kona: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-bcm-kona driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-bcm-kona.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-bcm-kona.c b/drivers/pwm/pwm-bcm-kona.c
index 47acae8d7478..91eab525aedd 100644
--- a/drivers/pwm/pwm-bcm-kona.c
+++ b/drivers/pwm/pwm-bcm-kona.c
@@ -56,14 +56,13 @@
 #define DUTY_CYCLE_HIGH_MAX			0x00ffffff
 
 struct kona_pwmc {
-	struct pwm_chip chip;
 	void __iomem *base;
 	struct clk *clk;
 };
 
 static inline struct kona_pwmc *to_kona_pwmc(struct pwm_chip *chip)
 {
-	return container_of(chip, struct kona_pwmc, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 /*
@@ -273,18 +272,18 @@ static const struct pwm_ops kona_pwm_ops = {
 
 static int kona_pwmc_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct kona_pwmc *kp;
 	unsigned int chan;
 	unsigned int value = 0;
 	int ret = 0;
 
-	kp = devm_kzalloc(&pdev->dev, sizeof(*kp), GFP_KERNEL);
-	if (kp == NULL)
+	chip = devm_pwmchip_alloc(&pdev->dev, 6, sizeof(*kp));
+	if (chip == NULL)
 		return -ENOMEM;
+	kp = to_kona_pwmc(chip);
 
-	kp->chip.dev = &pdev->dev;
-	kp->chip.ops = &kona_pwm_ops;
-	kp->chip.npwm = 6;
+	chip->ops = &kona_pwm_ops;
 
 	kp->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(kp->base))
@@ -304,14 +303,14 @@ static int kona_pwmc_probe(struct platform_device *pdev)
 	}
 
 	/* Set push/pull for all channels */
-	for (chan = 0; chan < kp->chip.npwm; chan++)
+	for (chan = 0; chan < chip->npwm; chan++)
 		value |= (1 << PWM_CONTROL_TYPE_SHIFT(chan));
 
 	writel(value, kp->base + PWM_CONTROL_OFFSET);
 
 	clk_disable_unprepare(kp->clk);
 
-	ret = devm_pwmchip_add(&pdev->dev, &kp->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0)
 		dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
 
-- 
2.42.0

[PATCH v4 052/115] pwm: berlin: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-berlin driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-berlin.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/pwm/pwm-berlin.c b/drivers/pwm/pwm-berlin.c
index 442913232dc0..831aed228caf 100644
--- a/drivers/pwm/pwm-berlin.c
+++ b/drivers/pwm/pwm-berlin.c
@@ -49,7 +49,6 @@ struct berlin_pwm_channel {
 };
 
 struct berlin_pwm_chip {
-	struct pwm_chip chip;
 	struct clk *clk;
 	void __iomem *base;
 	struct berlin_pwm_channel channel[BERLIN_PWM_NUMPWMS];
@@ -57,7 +56,7 @@ struct berlin_pwm_chip {
 
 static inline struct berlin_pwm_chip *to_berlin_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct berlin_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static inline u32 berlin_pwm_readl(struct berlin_pwm_chip *bpc,
@@ -198,12 +197,14 @@ MODULE_DEVICE_TABLE(of, berlin_pwm_match);
 
 static int berlin_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct berlin_pwm_chip *bpc;
 	int ret;
 
-	bpc = devm_kzalloc(&pdev->dev, sizeof(*bpc), GFP_KERNEL);
-	if (!bpc)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, BERLIN_PWM_NUMPWMS, sizeof(*bpc));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	bpc = to_berlin_pwm_chip(chip);
 
 	bpc->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(bpc->base))
@@ -213,25 +214,24 @@ static int berlin_pwm_probe(struct platform_device *pdev)
 	if (IS_ERR(bpc->clk))
 		return PTR_ERR(bpc->clk);
 
-	bpc->chip.dev = &pdev->dev;
-	bpc->chip.ops = &berlin_pwm_ops;
-	bpc->chip.npwm = BERLIN_PWM_NUMPWMS;
+	chip->ops = &berlin_pwm_ops;
 
-	ret = devm_pwmchip_add(&pdev->dev, &bpc->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0)
 		return dev_err_probe(&pdev->dev, ret, "failed to add PWM chip\n");
 
-	platform_set_drvdata(pdev, bpc);
+	platform_set_drvdata(pdev, chip);
 
 	return 0;
 }
 
 static int berlin_pwm_suspend(struct device *dev)
 {
-	struct berlin_pwm_chip *bpc = dev_get_drvdata(dev);
+	struct pwm_chip *chip = dev_get_drvdata(dev);
+	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
 	unsigned int i;
 
-	for (i = 0; i < bpc->chip.npwm; i++) {
+	for (i = 0; i < chip->npwm; i++) {
 		struct berlin_pwm_channel *channel = &bpc->channel[i];
 
 		channel->enable = berlin_pwm_readl(bpc, i, BERLIN_PWM_ENABLE);
@@ -247,7 +247,8 @@ static int berlin_pwm_suspend(struct device *dev)
 
 static int berlin_pwm_resume(struct device *dev)
 {
-	struct berlin_pwm_chip *bpc = dev_get_drvdata(dev);
+	struct pwm_chip *chip = dev_get_drvdata(dev);
+	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
 	unsigned int i;
 	int ret;
 
@@ -255,7 +256,7 @@ static int berlin_pwm_resume(struct device *dev)
 	if (ret)
 		return ret;
 
-	for (i = 0; i < bpc->chip.npwm; i++) {
+	for (i = 0; i < chip->npwm; i++) {
 		struct berlin_pwm_channel *channel = &bpc->channel[i];
 
 		berlin_pwm_writel(bpc, i, channel->ctrl, BERLIN_PWM_CONTROL);
-- 
2.42.0

[PATCH v4 053/115] pwm: brcmstb: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-brcmstb driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-brcmstb.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-brcmstb.c b/drivers/pwm/pwm-brcmstb.c
index 0fdeb0b2dbf3..82d27d07ba91 100644
--- a/drivers/pwm/pwm-brcmstb.c
+++ b/drivers/pwm/pwm-brcmstb.c
@@ -54,7 +54,6 @@
 struct brcmstb_pwm {
 	void __iomem *base;
 	struct clk *clk;
-	struct pwm_chip chip;
 };
 
 static inline u32 brcmstb_pwm_readl(struct brcmstb_pwm *p,
@@ -77,7 +76,7 @@ static inline void brcmstb_pwm_writel(struct brcmstb_pwm *p, u32 value,
 
 static inline struct brcmstb_pwm *to_brcmstb_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct brcmstb_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 /*
@@ -230,12 +229,14 @@ MODULE_DEVICE_TABLE(of, brcmstb_pwm_of_match);
 
 static int brcmstb_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct brcmstb_pwm *p;
 	int ret;
 
-	p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
-	if (!p)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 2, sizeof(*p));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	p = to_brcmstb_pwm(chip);
 
 	p->clk = devm_clk_get_enabled(&pdev->dev, NULL);
 	if (IS_ERR(p->clk))
@@ -244,15 +245,13 @@ static int brcmstb_pwm_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, p);
 
-	p->chip.dev = &pdev->dev;
-	p->chip.ops = &brcmstb_pwm_ops;
-	p->chip.npwm = 2;
+	chip->ops = &brcmstb_pwm_ops;
 
 	p->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(p->base))
 		return PTR_ERR(p->base);
 
-	ret = devm_pwmchip_add(&pdev->dev, &p->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret)
 		return dev_err_probe(&pdev->dev, ret, "failed to add PWM chip\n");
 
-- 
2.42.0

[PATCH v4 054/115] pwm: clk: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-clk driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-clk.c | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/pwm/pwm-clk.c b/drivers/pwm/pwm-clk.c
index 9dd88b386907..c19a482d7e28 100644
--- a/drivers/pwm/pwm-clk.c
+++ b/drivers/pwm/pwm-clk.c
@@ -28,12 +28,14 @@
 #include <linux/pwm.h>
 
 struct pwm_clk_chip {
-	struct pwm_chip chip;
 	struct clk *clk;
 	bool clk_enabled;
 };
 
-#define to_pwm_clk_chip(_chip) container_of(_chip, struct pwm_clk_chip, chip)
+static inline struct pwm_clk_chip *to_pwm_clk_chip(struct pwm_chip *chip)
+{
+	return pwmchip_get_drvdata(chip);
+}
 
 static int pwm_clk_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 			 const struct pwm_state *state)
@@ -81,35 +83,36 @@ static const struct pwm_ops pwm_clk_ops = {
 
 static int pwm_clk_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct pwm_clk_chip *pcchip;
 	int ret;
 
-	pcchip = devm_kzalloc(&pdev->dev, sizeof(*pcchip), GFP_KERNEL);
-	if (!pcchip)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*pcchip));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	pcchip = to_pwm_clk_chip(chip);
 
 	pcchip->clk = devm_clk_get_prepared(&pdev->dev, NULL);
 	if (IS_ERR(pcchip->clk))
 		return dev_err_probe(&pdev->dev, PTR_ERR(pcchip->clk),
 				     "Failed to get clock\n");
 
-	pcchip->chip.dev = &pdev->dev;
-	pcchip->chip.ops = &pwm_clk_ops;
-	pcchip->chip.npwm = 1;
+	chip->ops = &pwm_clk_ops;
 
-	ret = pwmchip_add(&pcchip->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0)
 		return dev_err_probe(&pdev->dev, ret, "Failed to add pwm chip\n");
 
-	platform_set_drvdata(pdev, pcchip);
+	platform_set_drvdata(pdev, chip);
 	return 0;
 }
 
 static void pwm_clk_remove(struct platform_device *pdev)
 {
-	struct pwm_clk_chip *pcchip = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct pwm_clk_chip *pcchip = to_pwm_clk_chip(chip);
 
-	pwmchip_remove(&pcchip->chip);
+	pwmchip_remove(chip);
 
 	if (pcchip->clk_enabled)
 		clk_disable(pcchip->clk);
-- 
2.42.0

[PATCH v4 055/115] pwm: clps711x: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-clps711x driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-clps711x.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/pwm/pwm-clps711x.c b/drivers/pwm/pwm-clps711x.c
index 42179b3f7ec3..9b80077fef20 100644
--- a/drivers/pwm/pwm-clps711x.c
+++ b/drivers/pwm/pwm-clps711x.c
@@ -12,7 +12,6 @@
 #include <linux/pwm.h>
 
 struct clps711x_chip {
-	struct pwm_chip chip;
 	void __iomem *pmpcon;
 	struct clk *clk;
 	spinlock_t lock;
@@ -20,7 +19,7 @@ struct clps711x_chip {
 
 static inline struct clps711x_chip *to_clps711x_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct clps711x_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int clps711x_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -85,11 +84,13 @@ static struct pwm_device *clps711x_pwm_xlate(struct pwm_chip *chip,
 
 static int clps711x_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct clps711x_chip *priv;
 
-	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 2, sizeof(*priv));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	priv = to_clps711x_chip(chip);
 
 	priv->pmpcon = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(priv->pmpcon))
@@ -99,15 +100,13 @@ static int clps711x_pwm_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->clk))
 		return PTR_ERR(priv->clk);
 
-	priv->chip.ops = &clps711x_pwm_ops;
-	priv->chip.dev = &pdev->dev;
-	priv->chip.npwm = 2;
-	priv->chip.of_xlate = clps711x_pwm_xlate;
-	priv->chip.of_pwm_n_cells = 1;
+	chip->ops = &clps711x_pwm_ops;
+	chip->of_xlate = clps711x_pwm_xlate;
+	chip->of_pwm_n_cells = 1;
 
 	spin_lock_init(&priv->lock);
 
-	return devm_pwmchip_add(&pdev->dev, &priv->chip);
+	return devm_pwmchip_add(&pdev->dev, chip);
 }
 
 static const struct of_device_id __maybe_unused clps711x_pwm_dt_ids[] = {
-- 
2.42.0

[PATCH v4 056/115] pwm: crc: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-crc driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-crc.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/pwm/pwm-crc.c b/drivers/pwm/pwm-crc.c
index c8a852345a97..98ee5cdbd0ba 100644
--- a/drivers/pwm/pwm-crc.c
+++ b/drivers/pwm/pwm-crc.c
@@ -26,17 +26,15 @@
 
 /**
  * struct crystalcove_pwm - Crystal Cove PWM controller
- * @chip: the abstract pwm_chip structure.
  * @regmap: the regmap from the parent device.
  */
 struct crystalcove_pwm {
-	struct pwm_chip chip;
 	struct regmap *regmap;
 };
 
 static inline struct crystalcove_pwm *to_crc_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct crystalcove_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int crc_pwm_calc_clk_div(int period_ns)
@@ -160,22 +158,22 @@ static const struct pwm_ops crc_pwm_ops = {
 
 static int crystalcove_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct crystalcove_pwm *crc_pwm;
 	struct device *dev = pdev->dev.parent;
 	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 
-	crc_pwm = devm_kzalloc(&pdev->dev, sizeof(*crc_pwm), GFP_KERNEL);
-	if (!crc_pwm)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*crc_pwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	crc_pwm = to_crc_pwm(chip);
 
-	crc_pwm->chip.dev = &pdev->dev;
-	crc_pwm->chip.ops = &crc_pwm_ops;
-	crc_pwm->chip.npwm = 1;
+	chip->ops = &crc_pwm_ops;
 
 	/* get the PMIC regmap */
 	crc_pwm->regmap = pmic->regmap;
 
-	return devm_pwmchip_add(&pdev->dev, &crc_pwm->chip);
+	return devm_pwmchip_add(&pdev->dev, chip);
 }
 
 static struct platform_driver crystalcove_pwm_driver = {
-- 
2.42.0

[PATCH v4 057/115] pwm: cros-ec: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-cros-ec driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.
The probe function had to be changed a bit because the number of PWMs
must be determined before allocation of the pwm_chip and its private
data now.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-cros-ec.c | 40 +++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 20 deletions(-)

diff --git a/drivers/pwm/pwm-cros-ec.c b/drivers/pwm/pwm-cros-ec.c
index 6c86cd4ba538..b8b39e9e6343 100644
--- a/drivers/pwm/pwm-cros-ec.c
+++ b/drivers/pwm/pwm-cros-ec.c
@@ -26,7 +26,6 @@
  */
 struct cros_ec_pwm_device {
 	struct cros_ec_device *ec;
-	struct pwm_chip chip;
 	bool use_pwm_type;
 	struct cros_ec_pwm *channel;
 };
@@ -41,7 +40,7 @@ struct cros_ec_pwm {
 
 static inline struct cros_ec_pwm_device *pwm_to_cros_ec_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct cros_ec_pwm_device, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int cros_ec_dt_type_to_pwm_type(u8 dt_index, u8 *pwm_type)
@@ -265,35 +264,36 @@ static int cros_ec_pwm_probe(struct platform_device *pdev)
 	struct device_node *np = pdev->dev.of_node;
 	struct cros_ec_pwm_device *ec_pwm;
 	struct pwm_chip *chip;
+	bool use_pwm_type = false;
+	unsigned int npwm;
 	int ret;
 
 	if (!ec)
 		return dev_err_probe(dev, -EINVAL, "no parent EC device\n");
 
-	ec_pwm = devm_kzalloc(dev, sizeof(*ec_pwm), GFP_KERNEL);
-	if (!ec_pwm)
-		return -ENOMEM;
-	chip = &ec_pwm->chip;
-	ec_pwm->ec = ec;
-
-	if (of_device_is_compatible(np, "google,cros-ec-pwm-type"))
-		ec_pwm->use_pwm_type = true;
-
-	/* PWM chip */
-	chip->dev = dev;
-	chip->ops = &cros_ec_pwm_ops;
-	chip->of_xlate = cros_ec_pwm_xlate;
-	chip->of_pwm_n_cells = 1;
-
-	if (ec_pwm->use_pwm_type) {
-		chip->npwm = CROS_EC_PWM_DT_COUNT;
+	if (of_device_is_compatible(np, "google,cros-ec-pwm-type")) {
+		use_pwm_type = true;
+		npwm = CROS_EC_PWM_DT_COUNT;
 	} else {
 		ret = cros_ec_num_pwms(ec);
 		if (ret < 0)
 			return dev_err_probe(dev, ret, "Couldn't find PWMs\n");
-		chip->npwm = ret;
+		npwm = ret;
 	}
 
+	chip = devm_pwmchip_alloc(dev, npwm, sizeof(*ec_pwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+
+	ec_pwm = pwm_to_cros_ec_pwm(chip);
+	ec_pwm->use_pwm_type = use_pwm_type;
+	ec_pwm->ec = ec;
+
+	/* PWM chip */
+	chip->ops = &cros_ec_pwm_ops;
+	chip->of_xlate = cros_ec_pwm_xlate;
+	chip->of_pwm_n_cells = 1;
+
 	ec_pwm->channel = devm_kcalloc(dev, chip->npwm, sizeof(*ec_pwm->channel),
 					GFP_KERNEL);
 	if (!ec_pwm->channel)
-- 
2.42.0

[PATCH v4 058/115] pwm: dwc: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-dwc driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-dwc-core.c | 17 +++++++++--------
 drivers/pwm/pwm-dwc.c      | 18 +++++++++++-------
 drivers/pwm/pwm-dwc.h      |  9 ++++++---
 3 files changed, 26 insertions(+), 18 deletions(-)

diff --git a/drivers/pwm/pwm-dwc-core.c b/drivers/pwm/pwm-dwc-core.c
index 146e40ccc4d3..761c215ce5ee 100644
--- a/drivers/pwm/pwm-dwc-core.c
+++ b/drivers/pwm/pwm-dwc-core.c
@@ -159,21 +159,22 @@ static const struct pwm_ops dwc_pwm_ops = {
 	.get_state = dwc_pwm_get_state,
 };
 
-struct dwc_pwm *dwc_pwm_alloc(struct device *dev)
+struct pwm_chip *dwc_pwm_alloc(struct device *dev)
 {
+	struct pwm_chip *chip;
 	struct dwc_pwm *dwc;
 
-	dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL);
-	if (!dwc)
+	chip = devm_pwmchip_alloc(dev, DWC_TIMERS_TOTAL, sizeof(struct dwc_pwm));
+	if (!chip)
 		return NULL;
+	dwc = to_dwc_pwm(chip);
 
 	dwc->clk_ns = 10;
-	dwc->chip.dev = dev;
-	dwc->chip.ops = &dwc_pwm_ops;
-	dwc->chip.npwm = DWC_TIMERS_TOTAL;
 
-	dev_set_drvdata(dev, dwc);
-	return dwc;
+	chip->ops = &dwc_pwm_ops;
+
+	dev_set_drvdata(dev, chip);
+	return chip;
 }
 EXPORT_SYMBOL_GPL(dwc_pwm_alloc);
 
diff --git a/drivers/pwm/pwm-dwc.c b/drivers/pwm/pwm-dwc.c
index 4929354f8cd9..1a20babb16fc 100644
--- a/drivers/pwm/pwm-dwc.c
+++ b/drivers/pwm/pwm-dwc.c
@@ -28,12 +28,14 @@
 static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)
 {
 	struct device *dev = &pci->dev;
+	struct pwm_chip *chip;
 	struct dwc_pwm *dwc;
 	int ret;
 
-	dwc = dwc_pwm_alloc(dev);
-	if (!dwc)
+	chip = dwc_pwm_alloc(dev);
+	if (!chip)
 		return -ENOMEM;
+	dwc = to_dwc_pwm(chip);
 
 	ret = pcim_enable_device(pci);
 	if (ret) {
@@ -55,7 +57,7 @@ static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)
 		return -ENOMEM;
 	}
 
-	ret = devm_pwmchip_add(dev, &dwc->chip);
+	ret = devm_pwmchip_add(dev, chip);
 	if (ret)
 		return ret;
 
@@ -74,13 +76,14 @@ static void dwc_pwm_remove(struct pci_dev *pci)
 static int dwc_pwm_suspend(struct device *dev)
 {
 	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
-	struct dwc_pwm *dwc = pci_get_drvdata(pdev);
+	struct pwm_chip *chip = pci_get_drvdata(pdev);
+	struct dwc_pwm *dwc = to_dwc_pwm(chip);
 	int i;
 
 	for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
-		if (dwc->chip.pwms[i].state.enabled) {
+		if (chip->pwms[i].state.enabled) {
 			dev_err(dev, "PWM %u in use by consumer (%s)\n",
-				i, dwc->chip.pwms[i].label);
+				i, chip->pwms[i].label);
 			return -EBUSY;
 		}
 		dwc->ctx[i].cnt = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT(i));
@@ -94,7 +97,8 @@ static int dwc_pwm_suspend(struct device *dev)
 static int dwc_pwm_resume(struct device *dev)
 {
 	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
-	struct dwc_pwm *dwc = pci_get_drvdata(pdev);
+	struct pwm_chip *chip = pci_get_drvdata(pdev);
+	struct dwc_pwm *dwc = to_dwc_pwm(chip);
 	int i;
 
 	for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
diff --git a/drivers/pwm/pwm-dwc.h b/drivers/pwm/pwm-dwc.h
index 64795247c54c..83f4091031fc 100644
--- a/drivers/pwm/pwm-dwc.h
+++ b/drivers/pwm/pwm-dwc.h
@@ -40,12 +40,15 @@ struct dwc_pwm_ctx {
 };
 
 struct dwc_pwm {
-	struct pwm_chip chip;
 	void __iomem *base;
 	unsigned int clk_ns;
 	struct dwc_pwm_ctx ctx[DWC_TIMERS_TOTAL];
 };
-#define to_dwc_pwm(p)	(container_of((p), struct dwc_pwm, chip))
+
+static inline struct dwc_pwm *to_dwc_pwm(struct pwm_chip *chip)
+{
+       return pwmchip_get_drvdata(chip);
+}
 
 static inline u32 dwc_pwm_readl(struct dwc_pwm *dwc, u32 offset)
 {
@@ -57,4 +60,4 @@ static inline void dwc_pwm_writel(struct dwc_pwm *dwc, u32 value, u32 offset)
 	writel(value, dwc->base + offset);
 }
 
-extern struct dwc_pwm *dwc_pwm_alloc(struct device *dev);
+extern struct pwm_chip *dwc_pwm_alloc(struct device *dev);
-- 
2.42.0

[PATCH v4 059/115] pwm: ep93xx: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-ep93xx driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-ep93xx.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-ep93xx.c b/drivers/pwm/pwm-ep93xx.c
index e4c3546a61c8..666f2954133c 100644
--- a/drivers/pwm/pwm-ep93xx.c
+++ b/drivers/pwm/pwm-ep93xx.c
@@ -36,12 +36,11 @@
 struct ep93xx_pwm {
 	void __iomem *base;
 	struct clk *clk;
-	struct pwm_chip chip;
 };
 
 static inline struct ep93xx_pwm *to_ep93xx_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct ep93xx_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int ep93xx_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -163,12 +162,14 @@ static const struct pwm_ops ep93xx_pwm_ops = {
 
 static int ep93xx_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct ep93xx_pwm *ep93xx_pwm;
 	int ret;
 
-	ep93xx_pwm = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_pwm), GFP_KERNEL);
-	if (!ep93xx_pwm)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*ep93xx_pwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	ep93xx_pwm = to_ep93xx_pwm(chip);
 
 	ep93xx_pwm->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(ep93xx_pwm->base))
@@ -178,11 +179,9 @@ static int ep93xx_pwm_probe(struct platform_device *pdev)
 	if (IS_ERR(ep93xx_pwm->clk))
 		return PTR_ERR(ep93xx_pwm->clk);
 
-	ep93xx_pwm->chip.dev = &pdev->dev;
-	ep93xx_pwm->chip.ops = &ep93xx_pwm_ops;
-	ep93xx_pwm->chip.npwm = 1;
+	chip->ops = &ep93xx_pwm_ops;
 
-	ret = devm_pwmchip_add(&pdev->dev, &ep93xx_pwm->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0)
 		return ret;
 
-- 
2.42.0

[PATCH v4 060/115] pwm: fsl-ftm: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-fsl-ftm driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-fsl-ftm.c | 39 ++++++++++++++++++++-------------------
 1 file changed, 20 insertions(+), 19 deletions(-)

diff --git a/drivers/pwm/pwm-fsl-ftm.c b/drivers/pwm/pwm-fsl-ftm.c
index 47f1f5ac39cf..4e0706352050 100644
--- a/drivers/pwm/pwm-fsl-ftm.c
+++ b/drivers/pwm/pwm-fsl-ftm.c
@@ -40,7 +40,6 @@ struct fsl_pwm_periodcfg {
 };
 
 struct fsl_pwm_chip {
-	struct pwm_chip chip;
 	struct mutex lock;
 	struct regmap *regmap;
 
@@ -55,7 +54,7 @@ struct fsl_pwm_chip {
 
 static inline struct fsl_pwm_chip *to_fsl_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct fsl_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static void ftm_clear_write_protection(struct fsl_pwm_chip *fpc)
@@ -393,18 +392,19 @@ static const struct regmap_config fsl_pwm_regmap_config = {
 
 static int fsl_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct fsl_pwm_chip *fpc;
 	void __iomem *base;
 	int ret;
 
-	fpc = devm_kzalloc(&pdev->dev, sizeof(*fpc), GFP_KERNEL);
-	if (!fpc)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 8, sizeof(*fpc));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	fpc = to_fsl_chip(chip);
 
 	mutex_init(&fpc->lock);
 
 	fpc->soc = of_device_get_match_data(&pdev->dev);
-	fpc->chip.dev = &pdev->dev;
 
 	base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(base))
@@ -423,16 +423,16 @@ static int fsl_pwm_probe(struct platform_device *pdev)
 		return PTR_ERR(fpc->clk[FSL_PWM_CLK_SYS]);
 	}
 
-	fpc->clk[FSL_PWM_CLK_FIX] = devm_clk_get(fpc->chip.dev, "ftm_fix");
+	fpc->clk[FSL_PWM_CLK_FIX] = devm_clk_get(&pdev->dev, "ftm_fix");
 	if (IS_ERR(fpc->clk[FSL_PWM_CLK_FIX]))
 		return PTR_ERR(fpc->clk[FSL_PWM_CLK_FIX]);
 
-	fpc->clk[FSL_PWM_CLK_EXT] = devm_clk_get(fpc->chip.dev, "ftm_ext");
+	fpc->clk[FSL_PWM_CLK_EXT] = devm_clk_get(&pdev->dev, "ftm_ext");
 	if (IS_ERR(fpc->clk[FSL_PWM_CLK_EXT]))
 		return PTR_ERR(fpc->clk[FSL_PWM_CLK_EXT]);
 
 	fpc->clk[FSL_PWM_CLK_CNTEN] =
-				devm_clk_get(fpc->chip.dev, "ftm_cnt_clk_en");
+				devm_clk_get(&pdev->dev, "ftm_cnt_clk_en");
 	if (IS_ERR(fpc->clk[FSL_PWM_CLK_CNTEN]))
 		return PTR_ERR(fpc->clk[FSL_PWM_CLK_CNTEN]);
 
@@ -445,16 +445,15 @@ static int fsl_pwm_probe(struct platform_device *pdev)
 		fpc->ipg_clk = fpc->clk[FSL_PWM_CLK_SYS];
 
 
-	fpc->chip.ops = &fsl_pwm_ops;
-	fpc->chip.npwm = 8;
+	chip->ops = &fsl_pwm_ops;
 
-	ret = devm_pwmchip_add(&pdev->dev, &fpc->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
 		return ret;
 	}
 
-	platform_set_drvdata(pdev, fpc);
+	platform_set_drvdata(pdev, chip);
 
 	return fsl_pwm_init(fpc);
 }
@@ -462,14 +461,15 @@ static int fsl_pwm_probe(struct platform_device *pdev)
 #ifdef CONFIG_PM_SLEEP
 static int fsl_pwm_suspend(struct device *dev)
 {
-	struct fsl_pwm_chip *fpc = dev_get_drvdata(dev);
+	struct pwm_chip *chip = dev_get_drvdata(dev);
+	struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
 	int i;
 
 	regcache_cache_only(fpc->regmap, true);
 	regcache_mark_dirty(fpc->regmap);
 
-	for (i = 0; i < fpc->chip.npwm; i++) {
-		struct pwm_device *pwm = &fpc->chip.pwms[i];
+	for (i = 0; i < chip->npwm; i++) {
+		struct pwm_device *pwm = &chip->pwms[i];
 
 		if (!test_bit(PWMF_REQUESTED, &pwm->flags))
 			continue;
@@ -488,11 +488,12 @@ static int fsl_pwm_suspend(struct device *dev)
 
 static int fsl_pwm_resume(struct device *dev)
 {
-	struct fsl_pwm_chip *fpc = dev_get_drvdata(dev);
+	struct pwm_chip *chip = dev_get_drvdata(dev);
+	struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
 	int i;
 
-	for (i = 0; i < fpc->chip.npwm; i++) {
-		struct pwm_device *pwm = &fpc->chip.pwms[i];
+	for (i = 0; i < chip->npwm; i++) {
+		struct pwm_device *pwm = &chip->pwms[i];
 
 		if (!test_bit(PWMF_REQUESTED, &pwm->flags))
 			continue;
-- 
2.42.0

[PATCH v4 061/115] pwm: hibvt: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-hibvt driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-hibvt.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/drivers/pwm/pwm-hibvt.c b/drivers/pwm/pwm-hibvt.c
index c435776e2f78..65d53717610b 100644
--- a/drivers/pwm/pwm-hibvt.c
+++ b/drivers/pwm/pwm-hibvt.c
@@ -33,7 +33,6 @@
 #define PWM_DUTY_MASK       GENMASK(31, 0)
 
 struct hibvt_pwm_chip {
-	struct pwm_chip	chip;
 	struct clk *clk;
 	void __iomem *base;
 	struct reset_control *rstc;
@@ -65,7 +64,7 @@ static const struct hibvt_pwm_soc hi3559v100_soc_info = {
 
 static inline struct hibvt_pwm_chip *to_hibvt_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct hibvt_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static void hibvt_pwm_set_bits(void __iomem *base, u32 offset,
@@ -191,12 +190,14 @@ static int hibvt_pwm_probe(struct platform_device *pdev)
 {
 	const struct hibvt_pwm_soc *soc =
 				of_device_get_match_data(&pdev->dev);
+	struct pwm_chip	*chip;
 	struct hibvt_pwm_chip *pwm_chip;
 	int ret, i;
 
-	pwm_chip = devm_kzalloc(&pdev->dev, sizeof(*pwm_chip), GFP_KERNEL);
-	if (pwm_chip == NULL)
+	chip = devm_pwmchip_alloc(&pdev->dev, soc->num_pwms, sizeof(*pwm_chip));
+	if (chip == NULL)
 		return -ENOMEM;
+	pwm_chip = to_hibvt_pwm_chip(chip);
 
 	pwm_chip->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(pwm_chip->clk)) {
@@ -205,9 +206,7 @@ static int hibvt_pwm_probe(struct platform_device *pdev)
 		return PTR_ERR(pwm_chip->clk);
 	}
 
-	pwm_chip->chip.ops = &hibvt_pwm_ops;
-	pwm_chip->chip.dev = &pdev->dev;
-	pwm_chip->chip.npwm = soc->num_pwms;
+	chip->ops = &hibvt_pwm_ops;
 	pwm_chip->soc = soc;
 
 	pwm_chip->base = devm_platform_ioremap_resource(pdev, 0);
@@ -228,29 +227,31 @@ static int hibvt_pwm_probe(struct platform_device *pdev)
 	msleep(30);
 	reset_control_deassert(pwm_chip->rstc);
 
-	ret = pwmchip_add(&pwm_chip->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0) {
 		clk_disable_unprepare(pwm_chip->clk);
 		return ret;
 	}
 
-	for (i = 0; i < pwm_chip->chip.npwm; i++) {
+	for (i = 0; i < chip->npwm; i++) {
 		hibvt_pwm_set_bits(pwm_chip->base, PWM_CTRL_ADDR(i),
 				PWM_KEEP_MASK, (0x1 << PWM_KEEP_SHIFT));
 	}
 
-	platform_set_drvdata(pdev, pwm_chip);
+	platform_set_drvdata(pdev, chip);
 
 	return 0;
 }
 
 static void hibvt_pwm_remove(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct hibvt_pwm_chip *pwm_chip;
 
-	pwm_chip = platform_get_drvdata(pdev);
+	chip = platform_get_drvdata(pdev);
+	pwm_chip = to_hibvt_pwm_chip(chip);
 
-	pwmchip_remove(&pwm_chip->chip);
+	pwmchip_remove(chip);
 
 	reset_control_assert(pwm_chip->rstc);
 	msleep(30);
-- 
2.42.0

[PATCH v4 062/115] pwm: img: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-img driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-img.c | 35 ++++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/pwm/pwm-img.c b/drivers/pwm/pwm-img.c
index 2d7477fc391a..8226169699fa 100644
--- a/drivers/pwm/pwm-img.c
+++ b/drivers/pwm/pwm-img.c
@@ -60,7 +60,6 @@ struct img_pwm_soc_data {
 
 struct img_pwm_chip {
 	struct device	*dev;
-	struct pwm_chip	chip;
 	struct clk	*pwm_clk;
 	struct clk	*sys_clk;
 	void __iomem	*base;
@@ -74,7 +73,7 @@ struct img_pwm_chip {
 
 static inline struct img_pwm_chip *to_img_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct img_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static inline void img_pwm_writel(struct img_pwm_chip *imgchip,
@@ -259,11 +258,13 @@ static int img_pwm_probe(struct platform_device *pdev)
 	int ret;
 	u64 val;
 	unsigned long clk_rate;
+	struct pwm_chip *chip;
 	struct img_pwm_chip *imgchip;
 
-	imgchip = devm_kzalloc(&pdev->dev, sizeof(*imgchip), GFP_KERNEL);
-	if (!imgchip)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, IMG_PWM_NPWM, sizeof(*imgchip));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	imgchip = to_img_pwm_chip(chip);
 
 	imgchip->dev = &pdev->dev;
 
@@ -290,7 +291,7 @@ static int img_pwm_probe(struct platform_device *pdev)
 		return PTR_ERR(imgchip->pwm_clk);
 	}
 
-	platform_set_drvdata(pdev, imgchip);
+	platform_set_drvdata(pdev, chip);
 
 	pm_runtime_set_autosuspend_delay(&pdev->dev, IMG_PWM_PM_TIMEOUT);
 	pm_runtime_use_autosuspend(&pdev->dev);
@@ -317,11 +318,9 @@ static int img_pwm_probe(struct platform_device *pdev)
 	do_div(val, clk_rate);
 	imgchip->min_period_ns = val;
 
-	imgchip->chip.dev = &pdev->dev;
-	imgchip->chip.ops = &img_pwm_ops;
-	imgchip->chip.npwm = IMG_PWM_NPWM;
+	chip->ops = &img_pwm_ops;
 
-	ret = pwmchip_add(&imgchip->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "pwmchip_add failed: %d\n", ret);
 		goto err_suspend;
@@ -340,19 +339,20 @@ static int img_pwm_probe(struct platform_device *pdev)
 
 static void img_pwm_remove(struct platform_device *pdev)
 {
-	struct img_pwm_chip *imgchip = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
 
 	pm_runtime_disable(&pdev->dev);
 	if (!pm_runtime_status_suspended(&pdev->dev))
 		img_pwm_runtime_suspend(&pdev->dev);
 
-	pwmchip_remove(&imgchip->chip);
+	pwmchip_remove(chip);
 }
 
 #ifdef CONFIG_PM_SLEEP
 static int img_pwm_suspend(struct device *dev)
 {
-	struct img_pwm_chip *imgchip = dev_get_drvdata(dev);
+	struct pwm_chip *chip = dev_get_drvdata(dev);
+	struct img_pwm_chip *imgchip = to_img_pwm_chip(chip);
 	int i, ret;
 
 	if (pm_runtime_status_suspended(dev)) {
@@ -361,7 +361,7 @@ static int img_pwm_suspend(struct device *dev)
 			return ret;
 	}
 
-	for (i = 0; i < imgchip->chip.npwm; i++)
+	for (i = 0; i < chip->npwm; i++)
 		imgchip->suspend_ch_cfg[i] = img_pwm_readl(imgchip,
 							   PWM_CH_CFG(i));
 
@@ -374,7 +374,8 @@ static int img_pwm_suspend(struct device *dev)
 
 static int img_pwm_resume(struct device *dev)
 {
-	struct img_pwm_chip *imgchip = dev_get_drvdata(dev);
+	struct pwm_chip *chip = dev_get_drvdata(dev);
+	struct img_pwm_chip *imgchip = to_img_pwm_chip(chip);
 	int ret;
 	int i;
 
@@ -382,13 +383,13 @@ static int img_pwm_resume(struct device *dev)
 	if (ret)
 		return ret;
 
-	for (i = 0; i < imgchip->chip.npwm; i++)
+	for (i = 0; i < chip->npwm; i++)
 		img_pwm_writel(imgchip, PWM_CH_CFG(i),
 			       imgchip->suspend_ch_cfg[i]);
 
 	img_pwm_writel(imgchip, PWM_CTRL_CFG, imgchip->suspend_ctrl_cfg);
 
-	for (i = 0; i < imgchip->chip.npwm; i++)
+	for (i = 0; i < chip->npwm; i++)
 		if (imgchip->suspend_ctrl_cfg & BIT(i))
 			regmap_clear_bits(imgchip->periph_regs,
 					  PERIP_PWM_PDM_CONTROL,
-- 
2.42.0

[PATCH v4 063/115] pwm: imx1: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-imx1 driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-imx1.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-imx1.c b/drivers/pwm/pwm-imx1.c
index d175d895f22a..1d2aae2d278f 100644
--- a/drivers/pwm/pwm-imx1.c
+++ b/drivers/pwm/pwm-imx1.c
@@ -28,10 +28,12 @@ struct pwm_imx1_chip {
 	struct clk *clk_ipg;
 	struct clk *clk_per;
 	void __iomem *mmio_base;
-	struct pwm_chip chip;
 };
 
-#define to_pwm_imx1_chip(chip)	container_of(chip, struct pwm_imx1_chip, chip)
+static inline struct pwm_imx1_chip *to_pwm_imx1_chip(struct pwm_chip *chip)
+{
+	return pwmchip_get_drvdata(chip);
+}
 
 static int pwm_imx1_clk_prepare_enable(struct pwm_chip *chip)
 {
@@ -156,11 +158,13 @@ MODULE_DEVICE_TABLE(of, pwm_imx1_dt_ids);
 
 static int pwm_imx1_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct pwm_imx1_chip *imx;
 
-	imx = devm_kzalloc(&pdev->dev, sizeof(*imx), GFP_KERNEL);
-	if (!imx)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*imx));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	imx = to_pwm_imx1_chip(chip);
 
 	imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
 	if (IS_ERR(imx->clk_ipg))
@@ -172,15 +176,13 @@ static int pwm_imx1_probe(struct platform_device *pdev)
 		return dev_err_probe(&pdev->dev, PTR_ERR(imx->clk_per),
 				     "failed to get peripheral clock\n");
 
-	imx->chip.ops = &pwm_imx1_ops;
-	imx->chip.dev = &pdev->dev;
-	imx->chip.npwm = 1;
+	chip->ops = &pwm_imx1_ops;
 
 	imx->mmio_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(imx->mmio_base))
 		return PTR_ERR(imx->mmio_base);
 
-	return devm_pwmchip_add(&pdev->dev, &imx->chip);
+	return devm_pwmchip_add(&pdev->dev, chip);
 }
 
 static struct platform_driver pwm_imx1_driver = {
-- 
2.42.0

[PATCH v4 064/115] pwm: imx27: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-imx27 driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-imx27.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-imx27.c b/drivers/pwm/pwm-imx27.c
index 5d796453519a..54589f0b3b78 100644
--- a/drivers/pwm/pwm-imx27.c
+++ b/drivers/pwm/pwm-imx27.c
@@ -83,7 +83,6 @@ struct pwm_imx27_chip {
 	struct clk	*clk_ipg;
 	struct clk	*clk_per;
 	void __iomem	*mmio_base;
-	struct pwm_chip	chip;
 
 	/*
 	 * The driver cannot read the current duty cycle from the hardware if
@@ -93,7 +92,10 @@ struct pwm_imx27_chip {
 	unsigned int duty_cycle;
 };
 
-#define to_pwm_imx27_chip(chip)	container_of(chip, struct pwm_imx27_chip, chip)
+static inline struct pwm_imx27_chip *to_pwm_imx27_chip(struct pwm_chip *chip)
+{
+	return pwmchip_get_drvdata(chip);
+}
 
 static int pwm_imx27_clk_prepare_enable(struct pwm_imx27_chip *imx)
 {
@@ -306,13 +308,15 @@ MODULE_DEVICE_TABLE(of, pwm_imx27_dt_ids);
 
 static int pwm_imx27_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct pwm_imx27_chip *imx;
 	int ret;
 	u32 pwmcr;
 
-	imx = devm_kzalloc(&pdev->dev, sizeof(*imx), GFP_KERNEL);
-	if (imx == NULL)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*imx));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	imx = to_pwm_imx27_chip(chip);
 
 	imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
 	if (IS_ERR(imx->clk_ipg))
@@ -324,9 +328,7 @@ static int pwm_imx27_probe(struct platform_device *pdev)
 		return dev_err_probe(&pdev->dev, PTR_ERR(imx->clk_per),
 				     "failed to get peripheral clock\n");
 
-	imx->chip.ops = &pwm_imx27_ops;
-	imx->chip.dev = &pdev->dev;
-	imx->chip.npwm = 1;
+	chip->ops = &pwm_imx27_ops;
 
 	imx->mmio_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(imx->mmio_base))
@@ -341,7 +343,7 @@ static int pwm_imx27_probe(struct platform_device *pdev)
 	if (!(pwmcr & MX3_PWMCR_EN))
 		pwm_imx27_clk_disable_unprepare(imx);
 
-	return devm_pwmchip_add(&pdev->dev, &imx->chip);
+	return devm_pwmchip_add(&pdev->dev, chip);
 }
 
 static struct platform_driver imx_pwm_driver = {
-- 
2.42.0

[PATCH v4 065/115] pwm: imx-tpm: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-tmp driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-imx-tpm.c | 34 +++++++++++++++++++---------------
 1 file changed, 19 insertions(+), 15 deletions(-)

diff --git a/drivers/pwm/pwm-imx-tpm.c b/drivers/pwm/pwm-imx-tpm.c
index 9fc290e647e1..04f8ab315748 100644
--- a/drivers/pwm/pwm-imx-tpm.c
+++ b/drivers/pwm/pwm-imx-tpm.c
@@ -57,7 +57,6 @@
 #define PWM_IMX_TPM_MOD_MOD	GENMASK(PWM_IMX_TPM_MOD_WIDTH - 1, 0)
 
 struct imx_tpm_pwm_chip {
-	struct pwm_chip chip;
 	struct clk *clk;
 	void __iomem *base;
 	struct mutex lock;
@@ -75,7 +74,7 @@ struct imx_tpm_pwm_param {
 static inline struct imx_tpm_pwm_chip *
 to_imx_tpm_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct imx_tpm_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 /*
@@ -336,35 +335,40 @@ static const struct pwm_ops imx_tpm_pwm_ops = {
 
 static int pwm_imx_tpm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct imx_tpm_pwm_chip *tpm;
+	void __iomem *base;
 	int ret;
+	unsigned int npwm;
 	u32 val;
 
-	tpm = devm_kzalloc(&pdev->dev, sizeof(*tpm), GFP_KERNEL);
-	if (!tpm)
-		return -ENOMEM;
+	base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	/* get number of channels */
+	val = readl(tpm->base + PWM_IMX_TPM_PARAM);
+	npwm = FIELD_GET(PWM_IMX_TPM_PARAM_CHAN, val);
+
+	chip = devm_pwmchip_alloc(&pdev->dev, npwm, sizeof(*tpm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	tpm = to_imx_tpm_pwm_chip(chip);
 
 	platform_set_drvdata(pdev, tpm);
 
-	tpm->base = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(tpm->base))
-		return PTR_ERR(tpm->base);
+	tpm->base = base;
 
 	tpm->clk = devm_clk_get_enabled(&pdev->dev, NULL);
 	if (IS_ERR(tpm->clk))
 		return dev_err_probe(&pdev->dev, PTR_ERR(tpm->clk),
 				     "failed to get PWM clock\n");
 
-	tpm->chip.dev = &pdev->dev;
-	tpm->chip.ops = &imx_tpm_pwm_ops;
-
-	/* get number of channels */
-	val = readl(tpm->base + PWM_IMX_TPM_PARAM);
-	tpm->chip.npwm = FIELD_GET(PWM_IMX_TPM_PARAM_CHAN, val);
+	chip->ops = &imx_tpm_pwm_ops;
 
 	mutex_init(&tpm->lock);
 
-	ret = devm_pwmchip_add(&pdev->dev, &tpm->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret)
 		return dev_err_probe(&pdev->dev, ret, "failed to add PWM chip\n");
 
-- 
2.42.0

[PATCH v4 066/115] pwm: intel-lgm: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-intel-lgm driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-intel-lgm.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-intel-lgm.c b/drivers/pwm/pwm-intel-lgm.c
index 54ecae7f937e..f9cc7c17c8f0 100644
--- a/drivers/pwm/pwm-intel-lgm.c
+++ b/drivers/pwm/pwm-intel-lgm.c
@@ -42,14 +42,13 @@
 #define LGM_PWM_PERIOD_2WIRE_NS		(40 * NSEC_PER_MSEC)
 
 struct lgm_pwm_chip {
-	struct pwm_chip chip;
 	struct regmap *regmap;
 	u32 period;
 };
 
 static inline struct lgm_pwm_chip *to_lgm_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct lgm_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int lgm_pwm_enable(struct pwm_chip *chip, bool enable)
@@ -168,14 +167,16 @@ static int lgm_pwm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct reset_control *rst;
+	struct pwm_chip *chip;
 	struct lgm_pwm_chip *pc;
 	void __iomem *io_base;
 	struct clk *clk;
 	int ret;
 
-	pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
-	if (!pc)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(dev, 1, sizeof(*pc));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	pc = to_lgm_pwm_chip(chip);
 
 	io_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(io_base))
@@ -203,13 +204,11 @@ static int lgm_pwm_probe(struct platform_device *pdev)
 	if (ret)
 		return dev_err_probe(dev, ret, "cannot deassert reset control\n");
 
-	pc->chip.dev = dev;
-	pc->chip.ops = &lgm_pwm_ops;
-	pc->chip.npwm = 1;
+	chip->ops = &lgm_pwm_ops;
 
 	lgm_pwm_init(pc);
 
-	ret = devm_pwmchip_add(dev, &pc->chip);
+	ret = devm_pwmchip_add(dev, chip);
 	if (ret < 0)
 		return dev_err_probe(dev, ret, "failed to add PWM chip\n");
 
-- 
2.42.0

[PATCH v4 067/115] pwm: iqs620a: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-iqs620a driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-iqs620a.c | 37 +++++++++++++++++++++----------------
 1 file changed, 21 insertions(+), 16 deletions(-)

diff --git a/drivers/pwm/pwm-iqs620a.c b/drivers/pwm/pwm-iqs620a.c
index 378ab036edfe..f2d1ed8df3eb 100644
--- a/drivers/pwm/pwm-iqs620a.c
+++ b/drivers/pwm/pwm-iqs620a.c
@@ -34,12 +34,17 @@
 
 struct iqs620_pwm_private {
 	struct iqs62x_core *iqs62x;
-	struct pwm_chip chip;
+	struct device *dev;
 	struct notifier_block notifier;
 	struct mutex lock;
 	unsigned int duty_scale;
 };
 
+static inline struct iqs620_pwm_private *iqs620_pwm_from_chip(struct pwm_chip *chip)
+{
+	return pwmchip_get_drvdata(chip);
+}
+
 static int iqs620_pwm_init(struct iqs620_pwm_private *iqs620_pwm,
 			   unsigned int duty_scale)
 {
@@ -73,7 +78,7 @@ static int iqs620_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (state->period < IQS620_PWM_PERIOD_NS)
 		return -EINVAL;
 
-	iqs620_pwm = container_of(chip, struct iqs620_pwm_private, chip);
+	iqs620_pwm = iqs620_pwm_from_chip(chip);
 
 	/*
 	 * The duty cycle generated by the device is calculated as follows:
@@ -107,9 +112,7 @@ static int iqs620_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 static int iqs620_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 				struct pwm_state *state)
 {
-	struct iqs620_pwm_private *iqs620_pwm;
-
-	iqs620_pwm = container_of(chip, struct iqs620_pwm_private, chip);
+	struct iqs620_pwm_private *iqs620_pwm = iqs620_pwm_from_chip(chip);
 
 	mutex_lock(&iqs620_pwm->lock);
 
@@ -155,7 +158,7 @@ static int iqs620_pwm_notifier(struct notifier_block *notifier,
 	mutex_unlock(&iqs620_pwm->lock);
 
 	if (ret) {
-		dev_err(iqs620_pwm->chip.dev,
+		dev_err(iqs620_pwm->dev,
 			"Failed to re-initialize device: %d\n", ret);
 		return NOTIFY_BAD;
 	}
@@ -170,28 +173,32 @@ static const struct pwm_ops iqs620_pwm_ops = {
 
 static void iqs620_pwm_notifier_unregister(void *context)
 {
-	struct iqs620_pwm_private *iqs620_pwm = context;
+	struct pwm_chip *chip = context;
+	struct iqs620_pwm_private *iqs620_pwm = iqs620_pwm_from_chip(chip);
 	int ret;
 
 	ret = blocking_notifier_chain_unregister(&iqs620_pwm->iqs62x->nh,
 						 &iqs620_pwm->notifier);
 	if (ret)
-		dev_err(iqs620_pwm->chip.dev,
+		dev_err(iqs620_pwm->dev,
 			"Failed to unregister notifier: %d\n", ret);
 }
 
 static int iqs620_pwm_probe(struct platform_device *pdev)
 {
 	struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
+	struct pwm_chip *chip;
 	struct iqs620_pwm_private *iqs620_pwm;
 	unsigned int val;
 	int ret;
 
-	iqs620_pwm = devm_kzalloc(&pdev->dev, sizeof(*iqs620_pwm), GFP_KERNEL);
-	if (!iqs620_pwm)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*iqs620_pwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	iqs620_pwm = iqs620_pwm_from_chip(chip);
 
 	iqs620_pwm->iqs62x = iqs62x;
+	iqs620_pwm->dev = &pdev->dev;
 
 	ret = regmap_read(iqs62x->regmap, IQS620_PWR_SETTINGS, &val);
 	if (ret)
@@ -205,9 +212,7 @@ static int iqs620_pwm_probe(struct platform_device *pdev)
 		iqs620_pwm->duty_scale = val + 1;
 	}
 
-	iqs620_pwm->chip.dev = &pdev->dev;
-	iqs620_pwm->chip.ops = &iqs620_pwm_ops;
-	iqs620_pwm->chip.npwm = 1;
+	chip->ops = &iqs620_pwm_ops;
 
 	mutex_init(&iqs620_pwm->lock);
 
@@ -221,11 +226,11 @@ static int iqs620_pwm_probe(struct platform_device *pdev)
 
 	ret = devm_add_action_or_reset(&pdev->dev,
 				       iqs620_pwm_notifier_unregister,
-				       iqs620_pwm);
+				       chip);
 	if (ret)
 		return ret;
 
-	ret = devm_pwmchip_add(&pdev->dev, &iqs620_pwm->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret)
 		dev_err(&pdev->dev, "Failed to add device: %d\n", ret);
 
-- 
2.42.0

[PATCH v4 068/115] pwm: jz4740: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-jz4740 driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Acked-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-jz4740.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
index 36763134cd87..5a7cc41df77e 100644
--- a/drivers/pwm/pwm-jz4740.c
+++ b/drivers/pwm/pwm-jz4740.c
@@ -25,14 +25,13 @@ struct soc_info {
 };
 
 struct jz4740_pwm_chip {
-	struct pwm_chip chip;
 	struct regmap *map;
 	struct clk *clk[];
 };
 
 static inline struct jz4740_pwm_chip *to_jz4740(struct pwm_chip *chip)
 {
-	return container_of(chip, struct jz4740_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static bool jz4740_pwm_can_use_chn(struct pwm_chip *chip, unsigned int channel)
@@ -222,6 +221,7 @@ static const struct pwm_ops jz4740_pwm_ops = {
 static int jz4740_pwm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct pwm_chip *chip;
 	struct jz4740_pwm_chip *jz;
 	const struct soc_info *info;
 
@@ -229,10 +229,10 @@ static int jz4740_pwm_probe(struct platform_device *pdev)
 	if (!info)
 		return -EINVAL;
 
-	jz = devm_kzalloc(dev, struct_size(jz, clk, info->num_pwms),
-			      GFP_KERNEL);
-	if (!jz)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(dev, info->num_pwms, struct_size(jz, clk, info->num_pwms));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	jz = to_jz4740(chip);
 
 	jz->map = device_node_to_regmap(dev->parent->of_node);
 	if (IS_ERR(jz->map)) {
@@ -240,11 +240,9 @@ static int jz4740_pwm_probe(struct platform_device *pdev)
 		return PTR_ERR(jz->map);
 	}
 
-	jz->chip.dev = dev;
-	jz->chip.ops = &jz4740_pwm_ops;
-	jz->chip.npwm = info->num_pwms;
+	chip->ops = &jz4740_pwm_ops;
 
-	return devm_pwmchip_add(dev, &jz->chip);
+	return devm_pwmchip_add(dev, chip);
 }
 
 static const struct soc_info jz4740_soc_info = {
-- 
2.42.0

[PATCH v4 069/115] pwm: keembay: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-keembay driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-keembay.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-keembay.c b/drivers/pwm/pwm-keembay.c
index ac824ecc3f64..35b641f3f6ed 100644
--- a/drivers/pwm/pwm-keembay.c
+++ b/drivers/pwm/pwm-keembay.c
@@ -36,7 +36,6 @@
 #define KMB_PWM_HIGHLOW_OFFSET(ch)	(0x20 + 4 * (ch))
 
 struct keembay_pwm {
-	struct pwm_chip chip;
 	struct device *dev;
 	struct clk *clk;
 	void __iomem *base;
@@ -44,7 +43,7 @@ struct keembay_pwm {
 
 static inline struct keembay_pwm *to_keembay_pwm_dev(struct pwm_chip *chip)
 {
-	return container_of(chip, struct keembay_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static void keembay_clk_unprepare(void *data)
@@ -185,12 +184,14 @@ static const struct pwm_ops keembay_pwm_ops = {
 static int keembay_pwm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct pwm_chip *chip;
 	struct keembay_pwm *priv;
 	int ret;
 
-	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(dev, KMB_TOTAL_PWM_CHANNELS, sizeof(*priv));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	priv = to_keembay_pwm_dev(chip);
 
 	priv->clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(priv->clk))
@@ -204,11 +205,9 @@ static int keembay_pwm_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	priv->chip.dev = dev;
-	priv->chip.ops = &keembay_pwm_ops;
-	priv->chip.npwm = KMB_TOTAL_PWM_CHANNELS;
+	chip->ops = &keembay_pwm_ops;
 
-	ret = devm_pwmchip_add(dev, &priv->chip);
+	ret = devm_pwmchip_add(dev, chip);
 	if (ret)
 		return dev_err_probe(dev, ret, "Failed to add PWM chip\n");
 
-- 
2.42.0

[PATCH v4 070/115] pwm: lp3943: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-lp3943 driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-lp3943.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-lp3943.c b/drivers/pwm/pwm-lp3943.c
index 32350a357278..61189cea1046 100644
--- a/drivers/pwm/pwm-lp3943.c
+++ b/drivers/pwm/pwm-lp3943.c
@@ -20,7 +20,6 @@
 #define LP3943_MAX_PERIOD		1600000
 
 struct lp3943_pwm {
-	struct pwm_chip chip;
 	struct lp3943 *lp3943;
 	struct lp3943_platform_data *pdata;
 	struct lp3943_pwm_map pwm_map[LP3943_NUM_PWMS];
@@ -28,7 +27,7 @@ struct lp3943_pwm {
 
 static inline struct lp3943_pwm *to_lp3943_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct lp3943_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static struct lp3943_pwm_map *
@@ -273,12 +272,14 @@ static int lp3943_pwm_parse_dt(struct device *dev,
 static int lp3943_pwm_probe(struct platform_device *pdev)
 {
 	struct lp3943 *lp3943 = dev_get_drvdata(pdev->dev.parent);
+	struct pwm_chip *chip;
 	struct lp3943_pwm *lp3943_pwm;
 	int ret;
 
-	lp3943_pwm = devm_kzalloc(&pdev->dev, sizeof(*lp3943_pwm), GFP_KERNEL);
-	if (!lp3943_pwm)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, LP3943_NUM_PWMS, sizeof(*lp3943_pwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	lp3943_pwm = to_lp3943_pwm(chip);
 
 	lp3943_pwm->pdata = lp3943->pdata;
 	if (!lp3943_pwm->pdata) {
@@ -292,11 +293,9 @@ static int lp3943_pwm_probe(struct platform_device *pdev)
 	}
 
 	lp3943_pwm->lp3943 = lp3943;
-	lp3943_pwm->chip.dev = &pdev->dev;
-	lp3943_pwm->chip.ops = &lp3943_pwm_ops;
-	lp3943_pwm->chip.npwm = LP3943_NUM_PWMS;
+	chip->ops = &lp3943_pwm_ops;
 
-	return devm_pwmchip_add(&pdev->dev, &lp3943_pwm->chip);
+	return devm_pwmchip_add(&pdev->dev, chip);
 }
 
 #ifdef CONFIG_OF
-- 
2.42.0

[PATCH v4 071/115] pwm: lpc18xx-sct: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-lpc18xx-sct driver to further changes of the pwm
core outlined in the commit introducing devm_pwmchip_alloc(). There is
no intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-lpc18xx-sct.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/drivers/pwm/pwm-lpc18xx-sct.c b/drivers/pwm/pwm-lpc18xx-sct.c
index 9e1db43a5171..39bfcd5b6c29 100644
--- a/drivers/pwm/pwm-lpc18xx-sct.c
+++ b/drivers/pwm/pwm-lpc18xx-sct.c
@@ -93,7 +93,6 @@ struct lpc18xx_pwm_data {
 
 struct lpc18xx_pwm_chip {
 	struct device *parent;
-	struct pwm_chip chip;
 	void __iomem *base;
 	struct clk *pwm_clk;
 	unsigned long clk_rate;
@@ -110,7 +109,7 @@ struct lpc18xx_pwm_chip {
 static inline struct lpc18xx_pwm_chip *
 to_lpc18xx_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct lpc18xx_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static inline void lpc18xx_pwm_writel(struct lpc18xx_pwm_chip *lpc18xx_pwm,
@@ -351,14 +350,15 @@ MODULE_DEVICE_TABLE(of, lpc18xx_pwm_of_match);
 
 static int lpc18xx_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct lpc18xx_pwm_chip *lpc18xx_pwm;
 	int ret;
 	u64 val;
 
-	lpc18xx_pwm = devm_kzalloc(&pdev->dev, sizeof(*lpc18xx_pwm),
-				   GFP_KERNEL);
-	if (!lpc18xx_pwm)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, LPC18XX_NUM_PWMS, sizeof(*lpc18xx_pwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	lpc18xx_pwm = to_lpc18xx_pwm_chip(chip);
 
 	lpc18xx_pwm->parent = &pdev->dev;
 
@@ -391,9 +391,7 @@ static int lpc18xx_pwm_probe(struct platform_device *pdev)
 	lpc18xx_pwm->min_period_ns = DIV_ROUND_UP(NSEC_PER_SEC,
 						  lpc18xx_pwm->clk_rate);
 
-	lpc18xx_pwm->chip.dev = &pdev->dev;
-	lpc18xx_pwm->chip.ops = &lpc18xx_pwm_ops;
-	lpc18xx_pwm->chip.npwm = LPC18XX_NUM_PWMS;
+	chip->ops = &lpc18xx_pwm_ops;
 
 	/* SCT counter must be in unify (32 bit) mode */
 	lpc18xx_pwm_writel(lpc18xx_pwm, LPC18XX_PWM_CONFIG,
@@ -425,21 +423,22 @@ static int lpc18xx_pwm_probe(struct platform_device *pdev)
 	val |= LPC18XX_PWM_PRE(0);
 	lpc18xx_pwm_writel(lpc18xx_pwm, LPC18XX_PWM_CTRL, val);
 
-	ret = pwmchip_add(&lpc18xx_pwm->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0)
 		return dev_err_probe(&pdev->dev, ret, "pwmchip_add failed\n");
 
-	platform_set_drvdata(pdev, lpc18xx_pwm);
+	platform_set_drvdata(pdev, chip);
 
 	return 0;
 }
 
 static void lpc18xx_pwm_remove(struct platform_device *pdev)
 {
-	struct lpc18xx_pwm_chip *lpc18xx_pwm = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct lpc18xx_pwm_chip *lpc18xx_pwm = to_lpc18xx_pwm_chip(chip);
 	u32 val;
 
-	pwmchip_remove(&lpc18xx_pwm->chip);
+	pwmchip_remove(chip);
 
 	val = lpc18xx_pwm_readl(lpc18xx_pwm, LPC18XX_PWM_CTRL);
 	lpc18xx_pwm_writel(lpc18xx_pwm, LPC18XX_PWM_CTRL,
-- 
2.42.0

[PATCH v4 072/115] pwm: lpc32xx: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-lpc32xx driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-lpc32xx.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/pwm/pwm-lpc32xx.c b/drivers/pwm/pwm-lpc32xx.c
index 1d9f3e7a2434..c748537e57d1 100644
--- a/drivers/pwm/pwm-lpc32xx.c
+++ b/drivers/pwm/pwm-lpc32xx.c
@@ -15,7 +15,6 @@
 #include <linux/slab.h>
 
 struct lpc32xx_pwm_chip {
-	struct pwm_chip chip;
 	struct clk *clk;
 	void __iomem *base;
 };
@@ -23,8 +22,10 @@ struct lpc32xx_pwm_chip {
 #define PWM_ENABLE	BIT(31)
 #define PWM_PIN_LEVEL	BIT(30)
 
-#define to_lpc32xx_pwm_chip(_chip) \
-	container_of(_chip, struct lpc32xx_pwm_chip, chip)
+static inline struct lpc32xx_pwm_chip *to_lpc32xx_pwm_chip(struct pwm_chip *chip)
+{
+	return pwmchip_get_drvdata(chip);
+}
 
 static int lpc32xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 			      int duty_ns, int period_ns)
@@ -119,13 +120,15 @@ static const struct pwm_ops lpc32xx_pwm_ops = {
 
 static int lpc32xx_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct lpc32xx_pwm_chip *lpc32xx;
 	int ret;
 	u32 val;
 
-	lpc32xx = devm_kzalloc(&pdev->dev, sizeof(*lpc32xx), GFP_KERNEL);
-	if (!lpc32xx)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*lpc32xx));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	lpc32xx = to_lpc32xx_pwm_chip(chip);
 
 	lpc32xx->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(lpc32xx->base))
@@ -135,16 +138,14 @@ static int lpc32xx_pwm_probe(struct platform_device *pdev)
 	if (IS_ERR(lpc32xx->clk))
 		return PTR_ERR(lpc32xx->clk);
 
-	lpc32xx->chip.dev = &pdev->dev;
-	lpc32xx->chip.ops = &lpc32xx_pwm_ops;
-	lpc32xx->chip.npwm = 1;
+	chip->ops = &lpc32xx_pwm_ops;
 
 	/* If PWM is disabled, configure the output to the default value */
 	val = readl(lpc32xx->base);
 	val &= ~PWM_PIN_LEVEL;
 	writel(val, lpc32xx->base);
 
-	ret = devm_pwmchip_add(&pdev->dev, &lpc32xx->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to add PWM chip, error %d\n", ret);
 		return ret;
-- 
2.42.0

[PATCH v4 073/115] pwm: lpss-*: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-lpc drivers to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-lpss-pci.c                 | 10 +++++-----
 drivers/pwm/pwm-lpss-platform.c            | 10 +++++-----
 drivers/pwm/pwm-lpss.c                     | 20 ++++++++++----------
 drivers/pwm/pwm-lpss.h                     |  1 -
 include/linux/platform_data/x86/pwm-lpss.h |  4 ++--
 5 files changed, 22 insertions(+), 23 deletions(-)

diff --git a/drivers/pwm/pwm-lpss-pci.c b/drivers/pwm/pwm-lpss-pci.c
index b4134bee2863..abaeac0e3226 100644
--- a/drivers/pwm/pwm-lpss-pci.c
+++ b/drivers/pwm/pwm-lpss-pci.c
@@ -18,7 +18,7 @@ static int pwm_lpss_probe_pci(struct pci_dev *pdev,
 			      const struct pci_device_id *id)
 {
 	const struct pwm_lpss_boardinfo *info;
-	struct pwm_lpss_chip *lpwm;
+	struct pwm_chip *chip;
 	int err;
 
 	err = pcim_enable_device(pdev);
@@ -30,11 +30,11 @@ static int pwm_lpss_probe_pci(struct pci_dev *pdev,
 		return err;
 
 	info = (struct pwm_lpss_boardinfo *)id->driver_data;
-	lpwm = devm_pwm_lpss_probe(&pdev->dev, pcim_iomap_table(pdev)[0], info);
-	if (IS_ERR(lpwm))
-		return PTR_ERR(lpwm);
+	chip = devm_pwm_lpss_probe(&pdev->dev, pcim_iomap_table(pdev)[0], info);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
 
-	pci_set_drvdata(pdev, lpwm);
+	pci_set_drvdata(pdev, chip);
 
 	pm_runtime_put(&pdev->dev);
 	pm_runtime_allow(&pdev->dev);
diff --git a/drivers/pwm/pwm-lpss-platform.c b/drivers/pwm/pwm-lpss-platform.c
index 319809aac2c4..90aeafa02a3b 100644
--- a/drivers/pwm/pwm-lpss-platform.c
+++ b/drivers/pwm/pwm-lpss-platform.c
@@ -20,7 +20,7 @@
 static int pwm_lpss_probe_platform(struct platform_device *pdev)
 {
 	const struct pwm_lpss_boardinfo *info;
-	struct pwm_lpss_chip *lpwm;
+	struct pwm_chip *chip;
 	void __iomem *base;
 
 	info = device_get_match_data(&pdev->dev);
@@ -31,11 +31,11 @@ static int pwm_lpss_probe_platform(struct platform_device *pdev)
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 
-	lpwm = devm_pwm_lpss_probe(&pdev->dev, base, info);
-	if (IS_ERR(lpwm))
-		return PTR_ERR(lpwm);
+	chip = devm_pwm_lpss_probe(&pdev->dev, base, info);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
 
-	platform_set_drvdata(pdev, lpwm);
+	platform_set_drvdata(pdev, chip);
 
 	/*
 	 * On Cherry Trail devices the GFX0._PS0 AML checks if the controller
diff --git a/drivers/pwm/pwm-lpss.c b/drivers/pwm/pwm-lpss.c
index 394c768f5a5f..b79fd3405e15 100644
--- a/drivers/pwm/pwm-lpss.c
+++ b/drivers/pwm/pwm-lpss.c
@@ -68,7 +68,7 @@ EXPORT_SYMBOL_GPL(pwm_lpss_tng_info);
 
 static inline struct pwm_lpss_chip *to_lpwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct pwm_lpss_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static inline u32 pwm_lpss_read(const struct pwm_device *pwm)
@@ -245,9 +245,10 @@ static const struct pwm_ops pwm_lpss_ops = {
 	.get_state = pwm_lpss_get_state,
 };
 
-struct pwm_lpss_chip *devm_pwm_lpss_probe(struct device *dev, void __iomem *base,
+struct pwm_chip *devm_pwm_lpss_probe(struct device *dev, void __iomem *base,
 					  const struct pwm_lpss_boardinfo *info)
 {
+	struct pwm_chip *chip;
 	struct pwm_lpss_chip *lpwm;
 	unsigned long c;
 	int i, ret;
@@ -256,9 +257,10 @@ struct pwm_lpss_chip *devm_pwm_lpss_probe(struct device *dev, void __iomem *base
 	if (WARN_ON(info->npwm > LPSS_MAX_PWMS))
 		return ERR_PTR(-ENODEV);
 
-	lpwm = devm_kzalloc(dev, sizeof(*lpwm), GFP_KERNEL);
-	if (!lpwm)
+	chip = devm_pwmchip_alloc(dev, info->npwm, sizeof(*lpwm));
+	if (!chip)
 		return ERR_PTR(-ENOMEM);
+	lpwm = to_lpwm(chip);
 
 	lpwm->regs = base;
 	lpwm->info = info;
@@ -267,23 +269,21 @@ struct pwm_lpss_chip *devm_pwm_lpss_probe(struct device *dev, void __iomem *base
 	if (!c)
 		return ERR_PTR(-EINVAL);
 
-	lpwm->chip.dev = dev;
-	lpwm->chip.ops = &pwm_lpss_ops;
-	lpwm->chip.npwm = info->npwm;
+	chip->ops = &pwm_lpss_ops;
 
-	ret = devm_pwmchip_add(dev, &lpwm->chip);
+	ret = devm_pwmchip_add(dev, chip);
 	if (ret) {
 		dev_err(dev, "failed to add PWM chip: %d\n", ret);
 		return ERR_PTR(ret);
 	}
 
 	for (i = 0; i < lpwm->info->npwm; i++) {
-		ctrl = pwm_lpss_read(&lpwm->chip.pwms[i]);
+		ctrl = pwm_lpss_read(&chip->pwms[i]);
 		if (ctrl & PWM_ENABLE)
 			pm_runtime_get(dev);
 	}
 
-	return lpwm;
+	return chip;
 }
 EXPORT_SYMBOL_GPL(devm_pwm_lpss_probe);
 
diff --git a/drivers/pwm/pwm-lpss.h b/drivers/pwm/pwm-lpss.h
index bf841250385f..b5267ab5193b 100644
--- a/drivers/pwm/pwm-lpss.h
+++ b/drivers/pwm/pwm-lpss.h
@@ -18,7 +18,6 @@
 #define LPSS_MAX_PWMS			4
 
 struct pwm_lpss_chip {
-	struct pwm_chip chip;
 	void __iomem *regs;
 	const struct pwm_lpss_boardinfo *info;
 };
diff --git a/include/linux/platform_data/x86/pwm-lpss.h b/include/linux/platform_data/x86/pwm-lpss.h
index c852fe24fe2a..752c06b47cc8 100644
--- a/include/linux/platform_data/x86/pwm-lpss.h
+++ b/include/linux/platform_data/x86/pwm-lpss.h
@@ -27,7 +27,7 @@ struct pwm_lpss_boardinfo {
 	bool other_devices_aml_touches_pwm_regs;
 };
 
-struct pwm_lpss_chip *devm_pwm_lpss_probe(struct device *dev, void __iomem *base,
-					  const struct pwm_lpss_boardinfo *info);
+struct pwm_chip *devm_pwm_lpss_probe(struct device *dev, void __iomem *base,
+				     const struct pwm_lpss_boardinfo *info);
 
 #endif	/* __PLATFORM_DATA_X86_PWM_LPSS_H */
-- 
2.42.0

[PATCH v4 074/115] pwm: mediatek: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-mediatek driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-mediatek.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
index d7d1c326e8cf..d4329affccda 100644
--- a/drivers/pwm/pwm-mediatek.c
+++ b/drivers/pwm/pwm-mediatek.c
@@ -51,7 +51,6 @@ struct pwm_mediatek_of_data {
  * @soc: pointer to chip's platform data
  */
 struct pwm_mediatek_chip {
-	struct pwm_chip chip;
 	void __iomem *regs;
 	struct clk *clk_top;
 	struct clk *clk_main;
@@ -70,7 +69,7 @@ static const unsigned int mtk_pwm_reg_offset_v2[] = {
 static inline struct pwm_mediatek_chip *
 to_pwm_mediatek_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct pwm_mediatek_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int pwm_mediatek_clk_enable(struct pwm_chip *chip,
@@ -233,21 +232,26 @@ static const struct pwm_ops pwm_mediatek_ops = {
 
 static int pwm_mediatek_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct pwm_mediatek_chip *pc;
+	const struct pwm_mediatek_of_data *soc;
 	unsigned int i;
 	int ret;
 
-	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
-	if (!pc)
-		return -ENOMEM;
+	soc = of_device_get_match_data(&pdev->dev);
 
-	pc->soc = of_device_get_match_data(&pdev->dev);
+	chip = devm_pwmchip_alloc(&pdev->dev, soc->num_pwms, sizeof(*pc));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	pc = to_pwm_mediatek_chip(chip);
+
+	pc->soc = soc;
 
 	pc->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(pc->regs))
 		return PTR_ERR(pc->regs);
 
-	pc->clk_pwms = devm_kmalloc_array(&pdev->dev, pc->soc->num_pwms,
+	pc->clk_pwms = devm_kmalloc_array(&pdev->dev, soc->num_pwms,
 				    sizeof(*pc->clk_pwms), GFP_KERNEL);
 	if (!pc->clk_pwms)
 		return -ENOMEM;
@@ -262,7 +266,7 @@ static int pwm_mediatek_probe(struct platform_device *pdev)
 		return dev_err_probe(&pdev->dev, PTR_ERR(pc->clk_main),
 				     "Failed to get main clock\n");
 
-	for (i = 0; i < pc->soc->num_pwms; i++) {
+	for (i = 0; i < soc->num_pwms; i++) {
 		char name[8];
 
 		snprintf(name, sizeof(name), "pwm%d", i + 1);
@@ -273,11 +277,9 @@ static int pwm_mediatek_probe(struct platform_device *pdev)
 					     "Failed to get %s clock\n", name);
 	}
 
-	pc->chip.dev = &pdev->dev;
-	pc->chip.ops = &pwm_mediatek_ops;
-	pc->chip.npwm = pc->soc->num_pwms;
+	chip->ops = &pwm_mediatek_ops;
 
-	ret = devm_pwmchip_add(&pdev->dev, &pc->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0)
 		return dev_err_probe(&pdev->dev, ret, "pwmchip_add() failed\n");
 
-- 
2.42.0

[PATCH v4 075/115] pwm: meson: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-meson driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-meson.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index 640d6fe63799..187cd6f35cce 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -102,7 +102,6 @@ struct meson_pwm_data {
 };
 
 struct meson_pwm {
-	struct pwm_chip chip;
 	const struct meson_pwm_data *data;
 	struct meson_pwm_channel channels[MESON_NUM_PWMS];
 	void __iomem *base;
@@ -115,7 +114,7 @@ struct meson_pwm {
 
 static inline struct meson_pwm *to_meson_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct meson_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int meson_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -449,7 +448,7 @@ static int meson_pwm_init_channels(struct pwm_chip *chip)
 		mux_parent_data[i].name = meson->data->parent_names[i];
 	}
 
-	for (i = 0; i < meson->chip.npwm; i++) {
+	for (i = 0; i < chip->npwm; i++) {
 		struct meson_pwm_channel *channel = &meson->channels[i];
 		struct clk_parent_data div_parent = {}, gate_parent = {};
 		struct clk_init_data init = {};
@@ -535,29 +534,29 @@ static int meson_pwm_init_channels(struct pwm_chip *chip)
 
 static int meson_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct meson_pwm *meson;
 	int err;
 
-	meson = devm_kzalloc(&pdev->dev, sizeof(*meson), GFP_KERNEL);
-	if (!meson)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, MESON_NUM_PWMS, sizeof(*meson));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	meson = to_meson_pwm(chip);
 
 	meson->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(meson->base))
 		return PTR_ERR(meson->base);
 
 	spin_lock_init(&meson->lock);
-	meson->chip.dev = &pdev->dev;
-	meson->chip.ops = &meson_pwm_ops;
-	meson->chip.npwm = MESON_NUM_PWMS;
+	chip->ops = &meson_pwm_ops;
 
 	meson->data = of_device_get_match_data(&pdev->dev);
 
-	err = meson_pwm_init_channels(&meson->chip);
+	err = meson_pwm_init_channels(chip);
 	if (err < 0)
 		return err;
 
-	err = devm_pwmchip_add(&pdev->dev, &meson->chip);
+	err = devm_pwmchip_add(&pdev->dev, chip);
 	if (err < 0) {
 		dev_err(&pdev->dev, "failed to register PWM chip: %d\n", err);
 		return err;
-- 
2.42.0

[PATCH v4 076/115] pwm: microchip-core: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-microchip-core driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-microchip-core.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-microchip-core.c b/drivers/pwm/pwm-microchip-core.c
index c0c53968f3e9..c1f2287b8e97 100644
--- a/drivers/pwm/pwm-microchip-core.c
+++ b/drivers/pwm/pwm-microchip-core.c
@@ -54,7 +54,6 @@
 #define MCHPCOREPWM_TIMEOUT_MS	100u
 
 struct mchp_core_pwm_chip {
-	struct pwm_chip chip;
 	struct clk *clk;
 	void __iomem *base;
 	struct mutex lock; /* protects the shared period */
@@ -65,7 +64,7 @@ struct mchp_core_pwm_chip {
 
 static inline struct mchp_core_pwm_chip *to_mchp_core_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct mchp_core_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static void mchp_core_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -447,13 +446,15 @@ MODULE_DEVICE_TABLE(of, mchp_core_of_match);
 
 static int mchp_core_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct mchp_core_pwm_chip *mchp_core_pwm;
 	struct resource *regs;
 	int ret;
 
-	mchp_core_pwm = devm_kzalloc(&pdev->dev, sizeof(*mchp_core_pwm), GFP_KERNEL);
-	if (!mchp_core_pwm)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 16, sizeof(*mchp_core_pwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	mchp_core_pwm = to_mchp_core_pwm(chip);
 
 	mchp_core_pwm->base = devm_platform_get_and_ioremap_resource(pdev, 0, &regs);
 	if (IS_ERR(mchp_core_pwm->base))
@@ -470,9 +471,7 @@ static int mchp_core_pwm_probe(struct platform_device *pdev)
 
 	mutex_init(&mchp_core_pwm->lock);
 
-	mchp_core_pwm->chip.dev = &pdev->dev;
-	mchp_core_pwm->chip.ops = &mchp_core_pwm_ops;
-	mchp_core_pwm->chip.npwm = 16;
+	chip->ops = &mchp_core_pwm_ops;
 
 	mchp_core_pwm->channel_enabled = readb_relaxed(mchp_core_pwm->base + MCHPCOREPWM_EN(0));
 	mchp_core_pwm->channel_enabled |=
@@ -485,7 +484,7 @@ static int mchp_core_pwm_probe(struct platform_device *pdev)
 	writel_relaxed(1U, mchp_core_pwm->base + MCHPCOREPWM_SYNC_UPD);
 	mchp_core_pwm->update_timestamp = ktime_get();
 
-	ret = devm_pwmchip_add(&pdev->dev, &mchp_core_pwm->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret)
 		return dev_err_probe(&pdev->dev, ret, "Failed to add pwmchip\n");
 
-- 
2.42.0

[PATCH v4 077/115] pwm: mtk-disp: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-mtk-disp driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-mtk-disp.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c
index 186aa5c04435..bafd6b6195f6 100644
--- a/drivers/pwm/pwm-mtk-disp.c
+++ b/drivers/pwm/pwm-mtk-disp.c
@@ -42,7 +42,6 @@ struct mtk_pwm_data {
 };
 
 struct mtk_disp_pwm {
-	struct pwm_chip chip;
 	const struct mtk_pwm_data *data;
 	struct clk *clk_main;
 	struct clk *clk_mm;
@@ -52,7 +51,7 @@ struct mtk_disp_pwm {
 
 static inline struct mtk_disp_pwm *to_mtk_disp_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct mtk_disp_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static void mtk_disp_pwm_update_bits(struct mtk_disp_pwm *mdp, u32 offset,
@@ -231,12 +230,14 @@ static const struct pwm_ops mtk_disp_pwm_ops = {
 
 static int mtk_disp_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct mtk_disp_pwm *mdp;
 	int ret;
 
-	mdp = devm_kzalloc(&pdev->dev, sizeof(*mdp), GFP_KERNEL);
-	if (!mdp)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*mdp));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	mdp = to_mtk_disp_pwm(chip);
 
 	mdp->data = of_device_get_match_data(&pdev->dev);
 
@@ -254,11 +255,9 @@ static int mtk_disp_pwm_probe(struct platform_device *pdev)
 		return dev_err_probe(&pdev->dev, PTR_ERR(mdp->clk_mm),
 				     "Failed to get mm clock\n");
 
-	mdp->chip.dev = &pdev->dev;
-	mdp->chip.ops = &mtk_disp_pwm_ops;
-	mdp->chip.npwm = 1;
+	chip->ops = &mtk_disp_pwm_ops;
 
-	ret = devm_pwmchip_add(&pdev->dev, &mdp->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0)
 		return dev_err_probe(&pdev->dev, ret, "pwmchip_add() failed\n");
 
-- 
2.42.0

[PATCH v4 078/115] pwm: mxs: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-mxs driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-mxs.c | 32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)

diff --git a/drivers/pwm/pwm-mxs.c b/drivers/pwm/pwm-mxs.c
index 1b5e787d78f1..8cad214b1c29 100644
--- a/drivers/pwm/pwm-mxs.c
+++ b/drivers/pwm/pwm-mxs.c
@@ -37,12 +37,14 @@ static const u8 cdiv_shift[PERIOD_CDIV_MAX] = {
 };
 
 struct mxs_pwm_chip {
-	struct pwm_chip chip;
 	struct clk *clk;
 	void __iomem *base;
 };
 
-#define to_mxs_pwm_chip(_chip) container_of(_chip, struct mxs_pwm_chip, chip)
+static inline struct mxs_pwm_chip *to_mxs_pwm_chip(struct pwm_chip *chip)
+{
+	return pwmchip_get_drvdata(chip);
+}
 
 static int mxs_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 			 const struct pwm_state *state)
@@ -120,12 +122,21 @@ static const struct pwm_ops mxs_pwm_ops = {
 static int mxs_pwm_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
+	struct pwm_chip *chip;
 	struct mxs_pwm_chip *mxs;
+	u32 npwm;
 	int ret;
 
-	mxs = devm_kzalloc(&pdev->dev, sizeof(*mxs), GFP_KERNEL);
-	if (!mxs)
-		return -ENOMEM;
+	ret = of_property_read_u32(np, "fsl,pwm-number", &npwm);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to get pwm number: %d\n", ret);
+		return ret;
+	}
+
+	chip = devm_pwmchip_alloc(&pdev->dev, npwm, sizeof(*mxs));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	mxs = to_mxs_pwm_chip(chip);
 
 	mxs->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(mxs->base))
@@ -135,21 +146,14 @@ static int mxs_pwm_probe(struct platform_device *pdev)
 	if (IS_ERR(mxs->clk))
 		return PTR_ERR(mxs->clk);
 
-	mxs->chip.dev = &pdev->dev;
-	mxs->chip.ops = &mxs_pwm_ops;
-
-	ret = of_property_read_u32(np, "fsl,pwm-number", &mxs->chip.npwm);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to get pwm number: %d\n", ret);
-		return ret;
-	}
+	chip->ops = &mxs_pwm_ops;
 
 	/* FIXME: Only do this if the PWM isn't already running */
 	ret = stmp_reset_block(mxs->base);
 	if (ret)
 		return dev_err_probe(&pdev->dev, ret, "failed to reset PWM\n");
 
-	ret = devm_pwmchip_add(&pdev->dev, &mxs->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to add pwm chip %d\n", ret);
 		return ret;
-- 
2.42.0

[PATCH v4 079/115] pwm: ntxec: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-ntxec driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-ntxec.c | 30 +++++++++++++-----------------
 1 file changed, 13 insertions(+), 17 deletions(-)

diff --git a/drivers/pwm/pwm-ntxec.c b/drivers/pwm/pwm-ntxec.c
index 78606039eda2..4cc019a0c4ef 100644
--- a/drivers/pwm/pwm-ntxec.c
+++ b/drivers/pwm/pwm-ntxec.c
@@ -25,12 +25,11 @@
 
 struct ntxec_pwm {
 	struct ntxec *ec;
-	struct pwm_chip chip;
 };
 
 static struct ntxec_pwm *ntxec_pwm_from_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct ntxec_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 #define NTXEC_REG_AUTO_OFF_HI	0xa1
@@ -57,7 +56,7 @@ static struct ntxec_pwm *ntxec_pwm_from_chip(struct pwm_chip *chip)
 static int ntxec_pwm_set_raw_period_and_duty_cycle(struct pwm_chip *chip,
 						   int period, int duty)
 {
-	struct ntxec_pwm *priv = ntxec_pwm_from_chip(chip);
+	struct ntxec *ec = ntxec_pwm_from_chip(chip)->ec;
 
 	/*
 	 * Changes to the period and duty cycle take effect as soon as the
@@ -77,13 +76,13 @@ static int ntxec_pwm_set_raw_period_and_duty_cycle(struct pwm_chip *chip,
 		{ NTXEC_REG_DUTY_LOW, ntxec_reg8(duty) },
 	};
 
-	return regmap_multi_reg_write(priv->ec->regmap, regs, ARRAY_SIZE(regs));
+	return regmap_multi_reg_write(ec->regmap, regs, ARRAY_SIZE(regs));
 }
 
 static int ntxec_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm_dev,
 			   const struct pwm_state *state)
 {
-	struct ntxec_pwm *priv = ntxec_pwm_from_chip(chip);
+	struct ntxec *ec = ntxec_pwm_from_chip(chip)->ec;
 	unsigned int period, duty;
 	int res;
 
@@ -110,18 +109,18 @@ static int ntxec_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm_dev,
 		if (res)
 			return res;
 
-		res = regmap_write(priv->ec->regmap, NTXEC_REG_ENABLE, ntxec_reg8(1));
+		res = regmap_write(ec->regmap, NTXEC_REG_ENABLE, ntxec_reg8(1));
 		if (res)
 			return res;
 
 		/* Disable the auto-off timer */
-		res = regmap_write(priv->ec->regmap, NTXEC_REG_AUTO_OFF_HI, ntxec_reg8(0xff));
+		res = regmap_write(ec->regmap, NTXEC_REG_AUTO_OFF_HI, ntxec_reg8(0xff));
 		if (res)
 			return res;
 
-		return regmap_write(priv->ec->regmap, NTXEC_REG_AUTO_OFF_LO, ntxec_reg8(0xff));
+		return regmap_write(ec->regmap, NTXEC_REG_AUTO_OFF_LO, ntxec_reg8(0xff));
 	} else {
-		return regmap_write(priv->ec->regmap, NTXEC_REG_ENABLE, ntxec_reg8(0));
+		return regmap_write(ec->regmap, NTXEC_REG_ENABLE, ntxec_reg8(0));
 	}
 }
 
@@ -135,22 +134,19 @@ static const struct pwm_ops ntxec_pwm_ops = {
 
 static int ntxec_pwm_probe(struct platform_device *pdev)
 {
-	struct ntxec *ec = dev_get_drvdata(pdev->dev.parent);
 	struct ntxec_pwm *priv;
 	struct pwm_chip *chip;
 
 	device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
 
-	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*priv));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	priv = ntxec_pwm_from_chip(chip);
 
-	priv->ec = ec;
+	priv->ec = dev_get_drvdata(pdev->dev.parent);
 
-	chip = &priv->chip;
-	chip->dev = &pdev->dev;
 	chip->ops = &ntxec_pwm_ops;
-	chip->npwm = 1;
 
 	return devm_pwmchip_add(&pdev->dev, chip);
 }
-- 
2.42.0

[PATCH v4 080/115] pwm: omap-dmtimer: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-omap-dmtimer driver to further changes of the pwm
core outlined in the commit introducing devm_pwmchip_alloc(). There is
no intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-omap-dmtimer.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c
index c7c7383f4b14..42f3e33a8aa8 100644
--- a/drivers/pwm/pwm-omap-dmtimer.c
+++ b/drivers/pwm/pwm-omap-dmtimer.c
@@ -61,7 +61,6 @@
  * @dm_timer_pdev:	Pointer to omap dm timer platform device
  */
 struct pwm_omap_dmtimer_chip {
-	struct pwm_chip chip;
 	/* Mutex to protect pwm apply state */
 	struct mutex mutex;
 	struct omap_dm_timer *dm_timer;
@@ -72,7 +71,7 @@ struct pwm_omap_dmtimer_chip {
 static inline struct pwm_omap_dmtimer_chip *
 to_pwm_omap_dmtimer_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct pwm_omap_dmtimer_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 /**
@@ -319,6 +318,7 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
 	struct dmtimer_platform_data *timer_pdata;
 	const struct omap_dm_timer_ops *pdata;
 	struct platform_device *timer_pdev;
+	struct pwm_chip *chip;
 	struct pwm_omap_dmtimer_chip *omap;
 	struct omap_dm_timer *dm_timer;
 	struct device_node *timer;
@@ -376,11 +376,12 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
 		goto err_request_timer;
 	}
 
-	omap = devm_kzalloc(&pdev->dev, sizeof(*omap), GFP_KERNEL);
-	if (!omap) {
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*omap));
+	if (!chip) {
 		ret = -ENOMEM;
 		goto err_alloc_omap;
 	}
+	omap = to_pwm_omap_dmtimer_chip(chip);
 
 	omap->pdata = pdata;
 	omap->dm_timer = dm_timer;
@@ -400,13 +401,11 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
 	if (!of_property_read_u32(pdev->dev.of_node, "ti,clock-source", &v))
 		omap->pdata->set_source(omap->dm_timer, v);
 
-	omap->chip.dev = &pdev->dev;
-	omap->chip.ops = &pwm_omap_dmtimer_ops;
-	omap->chip.npwm = 1;
+	chip->ops = &pwm_omap_dmtimer_ops;
 
 	mutex_init(&omap->mutex);
 
-	ret = pwmchip_add(&omap->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to register PWM\n");
 		goto err_pwmchip_add;
@@ -414,14 +413,14 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
 
 	of_node_put(timer);
 
-	platform_set_drvdata(pdev, omap);
+	platform_set_drvdata(pdev, chip);
 
 	return 0;
 
 err_pwmchip_add:
 
 	/*
-	 * *omap is allocated using devm_kzalloc,
+	 * *omap is allocated using devm_pwmchip_alloc,
 	 * so no free necessary here
 	 */
 err_alloc_omap:
@@ -442,9 +441,10 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
 
 static void pwm_omap_dmtimer_remove(struct platform_device *pdev)
 {
-	struct pwm_omap_dmtimer_chip *omap = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct pwm_omap_dmtimer_chip *omap = to_pwm_omap_dmtimer_chip(chip);
 
-	pwmchip_remove(&omap->chip);
+	pwmchip_remove(chip);
 
 	if (pm_runtime_active(&omap->dm_timer_pdev->dev))
 		omap->pdata->stop(omap->dm_timer);
-- 
2.42.0

[PATCH v4 081/115] pwm: pca9685: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-pca9685 driver to further changes of the pwm
core outlined in the commit introducing devm_pwmchip_alloc(). There is
no intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-pca9685.c | 76 +++++++++++++++++++++------------------
 1 file changed, 41 insertions(+), 35 deletions(-)

diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c
index 04e713ef790f..f88cc4c9c193 100644
--- a/drivers/pwm/pwm-pca9685.c
+++ b/drivers/pwm/pwm-pca9685.c
@@ -76,7 +76,6 @@
 #define REG_OFF_L(C)	((C) >= PCA9685_MAXCHAN ? PCA9685_ALL_LED_OFF_L : LED_N_OFF_L((C)))
 
 struct pca9685 {
-	struct pwm_chip chip;
 	struct regmap *regmap;
 	struct mutex lock;
 	struct device *parent;
@@ -89,7 +88,7 @@ struct pca9685 {
 
 static inline struct pca9685 *to_pca(struct pwm_chip *chip)
 {
-	return container_of(chip, struct pca9685, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 /* This function is supposed to be called with the lock mutex held */
@@ -133,9 +132,9 @@ static int pca9685_write_reg(struct pca9685 *pca, unsigned int reg, unsigned int
 }
 
 /* Helper function to set the duty cycle ratio to duty/4096 (e.g. duty=2048 -> 50%) */
-static void pca9685_pwm_set_duty(struct pca9685 *pca, int channel, unsigned int duty)
+static void pca9685_pwm_set_duty(struct pwm_chip *chip, struct pca9685 *pca, int channel, unsigned int duty)
 {
-	struct pwm_device *pwm = &pca->chip.pwms[channel];
+	struct pwm_device *pwm = &chip->pwms[channel];
 	unsigned int on, off;
 
 	if (duty == 0) {
@@ -172,9 +171,9 @@ static void pca9685_pwm_set_duty(struct pca9685 *pca, int channel, unsigned int
 	pca9685_write_reg(pca, REG_OFF_H(channel), (off >> 8) & 0xf);
 }
 
-static unsigned int pca9685_pwm_get_duty(struct pca9685 *pca, int channel)
+static unsigned int pca9685_pwm_get_duty(struct pwm_chip *chip, struct pca9685 *pca, int channel)
 {
-	struct pwm_device *pwm = &pca->chip.pwms[channel];
+	struct pwm_device *pwm = &chip->pwms[channel];
 	unsigned int off = 0, on = 0, val = 0;
 
 	if (WARN_ON(channel >= PCA9685_MAXCHAN)) {
@@ -248,7 +247,8 @@ static void pca9685_pwm_clear_inuse(struct pca9685 *pca, int pwm_idx)
 
 static int pca9685_pwm_gpio_request(struct gpio_chip *gpio, unsigned int offset)
 {
-	struct pca9685 *pca = gpiochip_get_data(gpio);
+	struct pwm_chip *chip = gpiochip_get_data(gpio);
+	struct pca9685 *pca = to_pca(chip);
 
 	if (pca9685_pwm_test_and_set_inuse(pca, offset))
 		return -EBUSY;
@@ -258,24 +258,27 @@ static int pca9685_pwm_gpio_request(struct gpio_chip *gpio, unsigned int offset)
 
 static int pca9685_pwm_gpio_get(struct gpio_chip *gpio, unsigned int offset)
 {
-	struct pca9685 *pca = gpiochip_get_data(gpio);
+	struct pwm_chip *chip = gpiochip_get_data(gpio);
+	struct pca9685 *pca = to_pca(chip);
 
-	return pca9685_pwm_get_duty(pca, offset) != 0;
+	return pca9685_pwm_get_duty(chip, pca, offset) != 0;
 }
 
 static void pca9685_pwm_gpio_set(struct gpio_chip *gpio, unsigned int offset,
 				 int value)
 {
-	struct pca9685 *pca = gpiochip_get_data(gpio);
+	struct pwm_chip *chip = gpiochip_get_data(gpio);
+	struct pca9685 *pca = to_pca(chip);
 
-	pca9685_pwm_set_duty(pca, offset, value ? PCA9685_COUNTER_RANGE : 0);
+	pca9685_pwm_set_duty(chip, pca, offset, value ? PCA9685_COUNTER_RANGE : 0);
 }
 
 static void pca9685_pwm_gpio_free(struct gpio_chip *gpio, unsigned int offset)
 {
-	struct pca9685 *pca = gpiochip_get_data(gpio);
+	struct pwm_chip *chip = gpiochip_get_data(gpio);
+	struct pca9685 *pca = to_pca(chip);
 
-	pca9685_pwm_set_duty(pca, offset, 0);
+	pca9685_pwm_set_duty(chip, pca, offset, 0);
 	pm_runtime_put(pca->parent);
 	pca9685_pwm_clear_inuse(pca, offset);
 }
@@ -307,7 +310,7 @@ static int pca9685_pwm_gpio_direction_output(struct gpio_chip *gpio,
  * expose a GPIO chip here which can exclusively take over the underlying
  * PWM channel.
  */
-static int pca9685_pwm_gpio_probe(struct pca9685 *pca)
+static int pca9685_pwm_gpio_probe(struct pwm_chip *chip, struct pca9685 *pca)
 {
 	struct device *dev = pca->parent;
 
@@ -324,7 +327,7 @@ static int pca9685_pwm_gpio_probe(struct pca9685 *pca)
 	pca->gpio.ngpio = PCA9685_MAXCHAN;
 	pca->gpio.can_sleep = true;
 
-	return devm_gpiochip_add_data(dev, &pca->gpio, pca);
+	return devm_gpiochip_add_data(dev, &pca->gpio, chip);
 }
 #else
 static inline bool pca9685_pwm_test_and_set_inuse(struct pca9685 *pca,
@@ -338,7 +341,7 @@ pca9685_pwm_clear_inuse(struct pca9685 *pca, int pwm_idx)
 {
 }
 
-static inline int pca9685_pwm_gpio_probe(struct pca9685 *pca)
+static inline int pca9685_pwm_gpio_probe(struct pwm_chip *chip, struct pca9685 *pca)
 {
 	return 0;
 }
@@ -379,7 +382,7 @@ static int __pca9685_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	}
 
 	if (!state->enabled) {
-		pca9685_pwm_set_duty(pca, pwm->hwpwm, 0);
+		pca9685_pwm_set_duty(chip, pca, pwm->hwpwm, 0);
 		return 0;
 	}
 
@@ -409,7 +412,7 @@ static int __pca9685_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	duty = PCA9685_COUNTER_RANGE * state->duty_cycle;
 	duty = DIV_ROUND_UP_ULL(duty, state->period);
-	pca9685_pwm_set_duty(pca, pwm->hwpwm, duty);
+	pca9685_pwm_set_duty(chip, pca, pwm->hwpwm, duty);
 	return 0;
 }
 
@@ -463,7 +466,7 @@ static int pca9685_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 	}
 
 	state->enabled = true;
-	duty = pca9685_pwm_get_duty(pca, pwm->hwpwm);
+	duty = pca9685_pwm_get_duty(chip, pca, pwm->hwpwm);
 	state->duty_cycle = DIV_ROUND_DOWN_ULL(duty * state->period, PCA9685_COUNTER_RANGE);
 
 	return 0;
@@ -493,7 +496,7 @@ static void pca9685_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 	struct pca9685 *pca = to_pca(chip);
 
 	mutex_lock(&pca->lock);
-	pca9685_pwm_set_duty(pca, pwm->hwpwm, 0);
+	pca9685_pwm_set_duty(chip, pca, pwm->hwpwm, 0);
 	clear_bit(pwm->hwpwm, pca->pwms_enabled);
 	mutex_unlock(&pca->lock);
 
@@ -517,13 +520,16 @@ static const struct regmap_config pca9685_regmap_i2c_config = {
 
 static int pca9685_pwm_probe(struct i2c_client *client)
 {
+	struct pwm_chip *chip;
 	struct pca9685 *pca;
 	unsigned int reg;
 	int ret;
 
-	pca = devm_kzalloc(&client->dev, sizeof(*pca), GFP_KERNEL);
-	if (!pca)
-		return -ENOMEM;
+	/* Add an extra channel for ALL_LED */
+	chip = devm_pwmchip_alloc(&client->dev, PCA9685_MAXCHAN + 1, sizeof(*pca));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	pca = to_pca(chip);
 
 	pca->regmap = devm_regmap_init_i2c(client, &pca9685_regmap_i2c_config);
 	if (IS_ERR(pca->regmap)) {
@@ -533,7 +539,7 @@ static int pca9685_pwm_probe(struct i2c_client *client)
 		return ret;
 	}
 
-	i2c_set_clientdata(client, pca);
+	i2c_set_clientdata(client, chip);
 
 	mutex_init(&pca->lock);
 
@@ -566,20 +572,17 @@ static int pca9685_pwm_probe(struct i2c_client *client)
 	pca9685_write_reg(pca, PCA9685_ALL_LED_ON_L, 0);
 	pca9685_write_reg(pca, PCA9685_ALL_LED_ON_H, LED_FULL);
 
-	pca->chip.ops = &pca9685_pwm_ops;
-	/* Add an extra channel for ALL_LED */
-	pca->chip.npwm = PCA9685_MAXCHAN + 1;
+	chip->ops = &pca9685_pwm_ops;
 
-	pca->chip.dev = &client->dev;
 	pca->parent = &client->dev;
 
-	ret = pwmchip_add(&pca->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0)
 		return ret;
 
-	ret = pca9685_pwm_gpio_probe(pca);
+	ret = pca9685_pwm_gpio_probe(chip, pca);
 	if (ret < 0) {
-		pwmchip_remove(&pca->chip);
+		pwmchip_remove(chip);
 		return ret;
 	}
 
@@ -602,9 +605,10 @@ static int pca9685_pwm_probe(struct i2c_client *client)
 
 static void pca9685_pwm_remove(struct i2c_client *client)
 {
-	struct pca9685 *pca = i2c_get_clientdata(client);
+	struct pwm_chip *chip = i2c_get_clientdata(client);
+	struct pca9685 *pca = to_pca(chip);
 
-	pwmchip_remove(&pca->chip);
+	pwmchip_remove(chip);
 
 	if (!pm_runtime_enabled(&client->dev)) {
 		/* Put chip in sleep state if runtime PM is disabled */
@@ -617,7 +621,8 @@ static void pca9685_pwm_remove(struct i2c_client *client)
 static int __maybe_unused pca9685_pwm_runtime_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
-	struct pca9685 *pca = i2c_get_clientdata(client);
+	struct pwm_chip *chip = i2c_get_clientdata(client);
+	struct pca9685 *pca = to_pca(chip);
 
 	pca9685_set_sleep_mode(pca, true);
 	return 0;
@@ -626,7 +631,8 @@ static int __maybe_unused pca9685_pwm_runtime_suspend(struct device *dev)
 static int __maybe_unused pca9685_pwm_runtime_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
-	struct pca9685 *pca = i2c_get_clientdata(client);
+	struct pwm_chip *chip = i2c_get_clientdata(client);
+	struct pca9685 *pca = to_pca(chip);
 
 	pca9685_set_sleep_mode(pca, false);
 	return 0;
-- 
2.42.0

[PATCH v4 082/115] pwm: pxa: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-pxa driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-pxa.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
index 76685f926c75..7eb48402e2a0 100644
--- a/drivers/pwm/pwm-pxa.c
+++ b/drivers/pwm/pwm-pxa.c
@@ -49,7 +49,6 @@ MODULE_DEVICE_TABLE(platform, pwm_id_table);
 #define PWMDCR_FD	(1 << 10)
 
 struct pxa_pwm_chip {
-	struct pwm_chip	chip;
 	struct device	*dev;
 
 	struct clk	*clk;
@@ -58,7 +57,7 @@ struct pxa_pwm_chip {
 
 static inline struct pxa_pwm_chip *to_pxa_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct pxa_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 /*
@@ -159,6 +158,7 @@ MODULE_DEVICE_TABLE(of, pwm_of_match);
 static int pwm_probe(struct platform_device *pdev)
 {
 	const struct platform_device_id *id = platform_get_device_id(pdev);
+	struct pwm_chip *chip;
 	struct pxa_pwm_chip *pc;
 	int ret = 0;
 
@@ -168,28 +168,29 @@ static int pwm_probe(struct platform_device *pdev)
 	if (id == NULL)
 		return -EINVAL;
 
-	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
-	if (pc == NULL)
+	chip = devm_pwmchip_alloc(&pdev->dev,
+				  (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1,
+				  sizeof(*pc));
+	if (chip == NULL)
 		return -ENOMEM;
+	pc = to_pxa_pwm_chip(chip);
 
 	pc->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(pc->clk))
 		return PTR_ERR(pc->clk);
 
-	pc->chip.dev = &pdev->dev;
-	pc->chip.ops = &pxa_pwm_ops;
-	pc->chip.npwm = (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1;
+	chip->ops = &pxa_pwm_ops;
 
 	if (IS_ENABLED(CONFIG_OF)) {
-		pc->chip.of_xlate = of_pwm_single_xlate;
-		pc->chip.of_pwm_n_cells = 1;
+		chip->of_xlate = of_pwm_single_xlate;
+		chip->of_pwm_n_cells = 1;
 	}
 
 	pc->mmio_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(pc->mmio_base))
 		return PTR_ERR(pc->mmio_base);
 
-	ret = devm_pwmchip_add(&pdev->dev, &pc->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
 		return ret;
-- 
2.42.0

[PATCH v4 083/115] pwm: raspberrypi-poe: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-raspberrypi-poe driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-raspberrypi-poe.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-raspberrypi-poe.c b/drivers/pwm/pwm-raspberrypi-poe.c
index f10e8a624c51..8921e7ea2cea 100644
--- a/drivers/pwm/pwm-raspberrypi-poe.c
+++ b/drivers/pwm/pwm-raspberrypi-poe.c
@@ -27,7 +27,6 @@
 
 struct raspberrypi_pwm {
 	struct rpi_firmware *firmware;
-	struct pwm_chip chip;
 	unsigned int duty_cycle;
 };
 
@@ -40,7 +39,7 @@ struct raspberrypi_pwm_prop {
 static inline
 struct raspberrypi_pwm *raspberrypi_pwm_from_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct raspberrypi_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int raspberrypi_pwm_set_property(struct rpi_firmware *firmware,
@@ -142,6 +141,7 @@ static int raspberrypi_pwm_probe(struct platform_device *pdev)
 	struct device_node *firmware_node;
 	struct device *dev = &pdev->dev;
 	struct rpi_firmware *firmware;
+	struct pwm_chip *chip;
 	struct raspberrypi_pwm *rpipwm;
 	int ret;
 
@@ -157,14 +157,14 @@ static int raspberrypi_pwm_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, -EPROBE_DEFER,
 				     "Failed to get firmware handle\n");
 
-	rpipwm = devm_kzalloc(&pdev->dev, sizeof(*rpipwm), GFP_KERNEL);
-	if (!rpipwm)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, RASPBERRYPI_FIRMWARE_PWM_NUM,
+				  sizeof(*rpipwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	rpipwm = raspberrypi_pwm_from_chip(chip);
 
 	rpipwm->firmware = firmware;
-	rpipwm->chip.dev = dev;
-	rpipwm->chip.ops = &raspberrypi_pwm_ops;
-	rpipwm->chip.npwm = RASPBERRYPI_FIRMWARE_PWM_NUM;
+	chip->ops = &raspberrypi_pwm_ops;
 
 	ret = raspberrypi_pwm_get_property(rpipwm->firmware, RPI_PWM_CUR_DUTY_REG,
 					   &rpipwm->duty_cycle);
@@ -173,7 +173,7 @@ static int raspberrypi_pwm_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	return devm_pwmchip_add(dev, &rpipwm->chip);
+	return devm_pwmchip_add(dev, chip);
 }
 
 static const struct of_device_id raspberrypi_pwm_of_match[] = {
-- 
2.42.0

[PATCH v4 084/115] pwm: rcar: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-rcar driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-rcar.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/pwm/pwm-rcar.c b/drivers/pwm/pwm-rcar.c
index 4838762137d1..435d5587fd55 100644
--- a/drivers/pwm/pwm-rcar.c
+++ b/drivers/pwm/pwm-rcar.c
@@ -38,14 +38,13 @@
 #define  RCAR_PWMCNT_PH0_SHIFT	0
 
 struct rcar_pwm_chip {
-	struct pwm_chip chip;
 	void __iomem *base;
 	struct clk *clk;
 };
 
 static inline struct rcar_pwm_chip *to_rcar_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct rcar_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static void rcar_pwm_write(struct rcar_pwm_chip *rp, u32 data,
@@ -202,12 +201,14 @@ static const struct pwm_ops rcar_pwm_ops = {
 
 static int rcar_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct rcar_pwm_chip *rcar_pwm;
 	int ret;
 
-	rcar_pwm = devm_kzalloc(&pdev->dev, sizeof(*rcar_pwm), GFP_KERNEL);
-	if (rcar_pwm == NULL)
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*rcar_pwm));
+	if (chip == NULL)
 		return -ENOMEM;
+	rcar_pwm = to_rcar_pwm_chip(chip);
 
 	rcar_pwm->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(rcar_pwm->base))
@@ -219,15 +220,13 @@ static int rcar_pwm_probe(struct platform_device *pdev)
 		return PTR_ERR(rcar_pwm->clk);
 	}
 
-	platform_set_drvdata(pdev, rcar_pwm);
+	platform_set_drvdata(pdev, chip);
 
-	rcar_pwm->chip.dev = &pdev->dev;
-	rcar_pwm->chip.ops = &rcar_pwm_ops;
-	rcar_pwm->chip.npwm = 1;
+	chip->ops = &rcar_pwm_ops;
 
 	pm_runtime_enable(&pdev->dev);
 
-	ret = pwmchip_add(&rcar_pwm->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to register PWM chip: %d\n", ret);
 		pm_runtime_disable(&pdev->dev);
@@ -239,9 +238,9 @@ static int rcar_pwm_probe(struct platform_device *pdev)
 
 static void rcar_pwm_remove(struct platform_device *pdev)
 {
-	struct rcar_pwm_chip *rcar_pwm = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
 
-	pwmchip_remove(&rcar_pwm->chip);
+	pwmchip_remove(chip);
 
 	pm_runtime_disable(&pdev->dev);
 }
-- 
2.42.0

[PATCH v4 085/115] pwm: renesas-tpu: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-renesas-tpu driver to further changes of the pwm
core outlined in the commit introducing devm_pwmchip_alloc(). There is
no intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-renesas-tpu.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/pwm/pwm-renesas-tpu.c b/drivers/pwm/pwm-renesas-tpu.c
index ce92db1f8511..c65d9b4e7773 100644
--- a/drivers/pwm/pwm-renesas-tpu.c
+++ b/drivers/pwm/pwm-renesas-tpu.c
@@ -80,7 +80,6 @@ struct tpu_pwm_device {
 
 struct tpu_device {
 	struct platform_device *pdev;
-	struct pwm_chip chip;
 	spinlock_t lock;
 
 	void __iomem *base;
@@ -88,7 +87,10 @@ struct tpu_device {
 	struct tpu_pwm_device tpd[TPU_CHANNEL_MAX];
 };
 
-#define to_tpu_device(c)	container_of(c, struct tpu_device, chip)
+static inline struct tpu_device *to_tpu_device(struct pwm_chip *chip)
+{
+	return pwmchip_get_drvdata(chip);
+}
 
 static void tpu_pwm_write(struct tpu_pwm_device *tpd, int reg_nr, u16 value)
 {
@@ -439,12 +441,14 @@ static const struct pwm_ops tpu_pwm_ops = {
 
 static int tpu_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct tpu_device *tpu;
 	int ret;
 
-	tpu = devm_kzalloc(&pdev->dev, sizeof(*tpu), GFP_KERNEL);
-	if (tpu == NULL)
+	chip = devm_pwmchip_alloc(&pdev->dev, TPU_CHANNEL_MAX, sizeof(*tpu));
+	if (chip == NULL)
 		return -ENOMEM;
+	tpu = to_tpu_device(chip);
 
 	spin_lock_init(&tpu->lock);
 	tpu->pdev = pdev;
@@ -461,15 +465,13 @@ static int tpu_probe(struct platform_device *pdev)
 	/* Initialize and register the device. */
 	platform_set_drvdata(pdev, tpu);
 
-	tpu->chip.dev = &pdev->dev;
-	tpu->chip.ops = &tpu_pwm_ops;
-	tpu->chip.npwm = TPU_CHANNEL_MAX;
+	chip->ops = &tpu_pwm_ops;
 
 	ret = devm_pm_runtime_enable(&pdev->dev);
 	if (ret < 0)
 		return dev_err_probe(&pdev->dev, ret, "Failed to enable runtime PM\n");
 
-	ret = devm_pwmchip_add(&pdev->dev, &tpu->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0)
 		return dev_err_probe(&pdev->dev, ret, "Failed to register PWM chip\n");
 
-- 
2.42.0

[PATCH v4 086/115] pwm: rockchip: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-rockchip driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-rockchip.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c
index a7c647e37837..0fa7575dbb54 100644
--- a/drivers/pwm/pwm-rockchip.c
+++ b/drivers/pwm/pwm-rockchip.c
@@ -30,7 +30,6 @@
 #define PWM_LP_DISABLE		(0 << 8)
 
 struct rockchip_pwm_chip {
-	struct pwm_chip chip;
 	struct clk *clk;
 	struct clk *pclk;
 	const struct rockchip_pwm_data *data;
@@ -54,7 +53,7 @@ struct rockchip_pwm_data {
 
 static inline struct rockchip_pwm_chip *to_rockchip_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct rockchip_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int rockchip_pwm_get_state(struct pwm_chip *chip,
@@ -296,14 +295,16 @@ MODULE_DEVICE_TABLE(of, rockchip_pwm_dt_ids);
 
 static int rockchip_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct rockchip_pwm_chip *pc;
 	u32 enable_conf, ctrl;
 	bool enabled;
 	int ret, count;
 
-	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
-	if (!pc)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*pc));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	pc = to_rockchip_pwm_chip(chip);
 
 	pc->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(pc->base))
@@ -337,18 +338,16 @@ static int rockchip_pwm_probe(struct platform_device *pdev)
 		goto err_clk;
 	}
 
-	platform_set_drvdata(pdev, pc);
+	platform_set_drvdata(pdev, chip);
 
 	pc->data = device_get_match_data(&pdev->dev);
-	pc->chip.dev = &pdev->dev;
-	pc->chip.ops = &rockchip_pwm_ops;
-	pc->chip.npwm = 1;
+	chip->ops = &rockchip_pwm_ops;
 
 	enable_conf = pc->data->enable_conf;
 	ctrl = readl_relaxed(pc->base + pc->data->regs.ctrl);
 	enabled = (ctrl & enable_conf) == enable_conf;
 
-	ret = pwmchip_add(&pc->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0) {
 		dev_err_probe(&pdev->dev, ret, "pwmchip_add() failed\n");
 		goto err_pclk;
@@ -372,9 +371,10 @@ static int rockchip_pwm_probe(struct platform_device *pdev)
 
 static void rockchip_pwm_remove(struct platform_device *pdev)
 {
-	struct rockchip_pwm_chip *pc = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
 
-	pwmchip_remove(&pc->chip);
+	pwmchip_remove(chip);
 
 	clk_unprepare(pc->pclk);
 	clk_unprepare(pc->clk);
-- 
2.42.0

[PATCH v4 087/115] pwm: rz-mtu3: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-rz-mtu3 driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-rz-mtu3.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/pwm/pwm-rz-mtu3.c b/drivers/pwm/pwm-rz-mtu3.c
index 45d075560a21..a6c75f708abf 100644
--- a/drivers/pwm/pwm-rz-mtu3.c
+++ b/drivers/pwm/pwm-rz-mtu3.c
@@ -72,7 +72,6 @@ struct rz_mtu3_pwm_channel {
  */
 
 struct rz_mtu3_pwm_chip {
-	struct pwm_chip chip;
 	struct clk *clk;
 	struct mutex lock;
 	unsigned long rate;
@@ -92,7 +91,7 @@ static const struct rz_mtu3_channel_io_map channel_map[] = {
 
 static inline struct rz_mtu3_pwm_chip *to_rz_mtu3_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct rz_mtu3_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static void rz_mtu3_pwm_read_tgr_registers(struct rz_mtu3_pwm_channel *priv,
@@ -219,7 +218,7 @@ static int rz_mtu3_pwm_enable(struct rz_mtu3_pwm_chip *rz_mtu3_pwm,
 	u8 val;
 	int rc;
 
-	rc = pm_runtime_resume_and_get(rz_mtu3_pwm->chip.dev);
+	rc = pm_runtime_resume_and_get(pwmchip_parent(pwm->chip));
 	if (rc)
 		return rc;
 
@@ -265,7 +264,7 @@ static void rz_mtu3_pwm_disable(struct rz_mtu3_pwm_chip *rz_mtu3_pwm,
 
 	mutex_unlock(&rz_mtu3_pwm->lock);
 
-	pm_runtime_put_sync(rz_mtu3_pwm->chip.dev);
+	pm_runtime_put_sync(pwmchip_parent(pwm->chip));
 }
 
 static int rz_mtu3_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -462,24 +461,27 @@ static DEFINE_RUNTIME_DEV_PM_OPS(rz_mtu3_pwm_pm_ops,
 
 static void rz_mtu3_pwm_pm_disable(void *data)
 {
-	struct rz_mtu3_pwm_chip *rz_mtu3_pwm = data;
+	struct pwm_chip *chip = data;
+	struct rz_mtu3_pwm_chip *rz_mtu3_pwm = to_rz_mtu3_pwm_chip(chip);
 
 	clk_rate_exclusive_put(rz_mtu3_pwm->clk);
-	pm_runtime_disable(rz_mtu3_pwm->chip.dev);
-	pm_runtime_set_suspended(rz_mtu3_pwm->chip.dev);
+	pm_runtime_disable(pwmchip_parent(chip));
+	pm_runtime_set_suspended(pwmchip_parent(chip));
 }
 
 static int rz_mtu3_pwm_probe(struct platform_device *pdev)
 {
 	struct rz_mtu3 *parent_ddata = dev_get_drvdata(pdev->dev.parent);
+	struct pwm_chip *chip;
 	struct rz_mtu3_pwm_chip *rz_mtu3_pwm;
 	struct device *dev = &pdev->dev;
 	unsigned int i, j = 0;
 	int ret;
 
-	rz_mtu3_pwm = devm_kzalloc(&pdev->dev, sizeof(*rz_mtu3_pwm), GFP_KERNEL);
-	if (!rz_mtu3_pwm)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, RZ_MTU3_MAX_PWM_CHANNELS, sizeof(*rz_mtu3_pwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	rz_mtu3_pwm = to_rz_mtu3_pwm_chip(chip);
 
 	rz_mtu3_pwm->clk = parent_ddata->clk;
 
@@ -514,15 +516,13 @@ static int rz_mtu3_pwm_probe(struct platform_device *pdev)
 
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
-	rz_mtu3_pwm->chip.dev = &pdev->dev;
 	ret = devm_add_action_or_reset(&pdev->dev, rz_mtu3_pwm_pm_disable,
-				       rz_mtu3_pwm);
+				       chip);
 	if (ret < 0)
 		return ret;
 
-	rz_mtu3_pwm->chip.ops = &rz_mtu3_pwm_ops;
-	rz_mtu3_pwm->chip.npwm = RZ_MTU3_MAX_PWM_CHANNELS;
-	ret = devm_pwmchip_add(&pdev->dev, &rz_mtu3_pwm->chip);
+	chip->ops = &rz_mtu3_pwm_ops;
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret)
 		return dev_err_probe(&pdev->dev, ret, "failed to add PWM chip\n");
 
-- 
2.42.0

[PATCH v4 088/115] pwm: samsung: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-samsung driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-samsung.c | 45 +++++++++++++++++++++------------------
 1 file changed, 24 insertions(+), 21 deletions(-)

diff --git a/drivers/pwm/pwm-samsung.c b/drivers/pwm/pwm-samsung.c
index a97cae49406e..fcbe464b0c38 100644
--- a/drivers/pwm/pwm-samsung.c
+++ b/drivers/pwm/pwm-samsung.c
@@ -80,7 +80,6 @@ struct samsung_pwm_channel {
  * @channel:		per channel driver data
  */
 struct samsung_pwm_chip {
-	struct pwm_chip chip;
 	struct samsung_pwm_variant variant;
 	u8 inverter_mask;
 	u8 disabled_mask;
@@ -110,7 +109,7 @@ static DEFINE_SPINLOCK(samsung_pwm_lock);
 static inline
 struct samsung_pwm_chip *to_samsung_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct samsung_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static inline unsigned int to_tcon_channel(unsigned int channel)
@@ -181,9 +180,10 @@ static unsigned long pwm_samsung_get_tin_rate(struct samsung_pwm_chip *our_chip,
 	return rate / (reg + 1);
 }
 
-static unsigned long pwm_samsung_calc_tin(struct samsung_pwm_chip *our_chip,
+static unsigned long pwm_samsung_calc_tin(struct pwm_chip *chip,
 					  unsigned int chan, unsigned long freq)
 {
+	struct samsung_pwm_chip *our_chip = to_samsung_pwm_chip(chip);
 	struct samsung_pwm_variant *variant = &our_chip->variant;
 	unsigned long rate;
 	struct clk *clk;
@@ -197,12 +197,12 @@ static unsigned long pwm_samsung_calc_tin(struct samsung_pwm_chip *our_chip,
 				return rate;
 		}
 
-		dev_warn(pwmchip_parent(&our_chip->chip),
+		dev_warn(pwmchip_parent(chip),
 			"tclk of PWM %d is inoperational, using tdiv\n", chan);
 	}
 
 	rate = pwm_samsung_get_tin_rate(our_chip, chan);
-	dev_dbg(pwmchip_parent(&our_chip->chip), "tin parent at %lu\n", rate);
+	dev_dbg(pwmchip_parent(chip), "tin parent at %lu\n", rate);
 
 	/*
 	 * Compare minimum PWM frequency that can be achieved with possible
@@ -329,7 +329,7 @@ static int __pwm_samsung_config(struct pwm_chip *chip, struct pwm_device *pwm,
 		dev_dbg(pwmchip_parent(chip), "duty_ns=%d, period_ns=%d (%u)\n",
 						duty_ns, period_ns, period);
 
-		tin_rate = pwm_samsung_calc_tin(our_chip, pwm->hwpwm, period);
+		tin_rate = pwm_samsung_calc_tin(chip, pwm->hwpwm, period);
 
 		dev_dbg(pwmchip_parent(chip), "tin_rate=%lu\n", tin_rate);
 
@@ -506,9 +506,10 @@ static const struct of_device_id samsung_pwm_matches[] = {
 };
 MODULE_DEVICE_TABLE(of, samsung_pwm_matches);
 
-static int pwm_samsung_parse_dt(struct samsung_pwm_chip *our_chip)
+static int pwm_samsung_parse_dt(struct pwm_chip *chip)
 {
-	struct device_node *np = pwmchip_parent(&our_chip->chip)->of_node;
+	struct samsung_pwm_chip *our_chip = to_samsung_pwm_chip(chip);
+	struct device_node *np = pwmchip_parent(chip)->of_node;
 	const struct of_device_id *match;
 	struct property *prop;
 	const __be32 *cur;
@@ -522,7 +523,7 @@ static int pwm_samsung_parse_dt(struct samsung_pwm_chip *our_chip)
 
 	of_property_for_each_u32(np, "samsung,pwm-outputs", prop, cur, val) {
 		if (val >= SAMSUNG_PWM_NUM) {
-			dev_err(pwmchip_parent(&our_chip->chip),
+			dev_err(pwmchip_parent(chip),
 				"%s: invalid channel index in samsung,pwm-outputs property\n",
 								__func__);
 			continue;
@@ -533,7 +534,7 @@ static int pwm_samsung_parse_dt(struct samsung_pwm_chip *our_chip)
 	return 0;
 }
 #else
-static int pwm_samsung_parse_dt(struct samsung_pwm_chip *our_chip)
+static int pwm_samsung_parse_dt(struct pwm_chip *chip)
 {
 	return -ENODEV;
 }
@@ -542,21 +543,22 @@ static int pwm_samsung_parse_dt(struct samsung_pwm_chip *our_chip)
 static int pwm_samsung_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct pwm_chip *chip;
 	struct samsung_pwm_chip *our_chip;
 	unsigned int chan;
 	int ret;
 
-	our_chip = devm_kzalloc(&pdev->dev, sizeof(*our_chip), GFP_KERNEL);
-	if (our_chip == NULL)
+	chip = devm_pwmchip_alloc(&pdev->dev, SAMSUNG_PWM_NUM, sizeof(*chip));
+	if (chip == NULL)
 		return -ENOMEM;
+	our_chip = to_samsung_pwm_chip(chip);
+
+	chip->ops = &pwm_samsung_ops;
 
-	our_chip->chip.dev = &pdev->dev;
-	our_chip->chip.ops = &pwm_samsung_ops;
-	our_chip->chip.npwm = SAMSUNG_PWM_NUM;
 	our_chip->inverter_mask = BIT(SAMSUNG_PWM_NUM) - 1;
 
 	if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
-		ret = pwm_samsung_parse_dt(our_chip);
+		ret = pwm_samsung_parse_dt(chip);
 		if (ret)
 			return ret;
 	} else {
@@ -595,7 +597,7 @@ static int pwm_samsung_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, our_chip);
 
-	ret = pwmchip_add(&our_chip->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0) {
 		dev_err(dev, "failed to register PWM chip\n");
 		clk_disable_unprepare(our_chip->base_clk);
@@ -612,17 +614,18 @@ static int pwm_samsung_probe(struct platform_device *pdev)
 
 static void pwm_samsung_remove(struct platform_device *pdev)
 {
-	struct samsung_pwm_chip *our_chip = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct samsung_pwm_chip *our_chip = to_samsung_pwm_chip(chip);
 
-	pwmchip_remove(&our_chip->chip);
+	pwmchip_remove(chip);
 
 	clk_disable_unprepare(our_chip->base_clk);
 }
 
 static int pwm_samsung_resume(struct device *dev)
 {
-	struct samsung_pwm_chip *our_chip = dev_get_drvdata(dev);
-	struct pwm_chip *chip = &our_chip->chip;
+	struct pwm_chip *chip = dev_get_drvdata(dev);
+	struct samsung_pwm_chip *our_chip = to_samsung_pwm_chip(chip);
 	unsigned int i;
 
 	for (i = 0; i < SAMSUNG_PWM_NUM; i++) {
-- 
2.42.0

[PATCH v4 089/115] pwm: sifive: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-sifive driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-sifive.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/pwm/pwm-sifive.c b/drivers/pwm/pwm-sifive.c
index c1b412905d9e..cf3fcffe7b3a 100644
--- a/drivers/pwm/pwm-sifive.c
+++ b/drivers/pwm/pwm-sifive.c
@@ -41,7 +41,7 @@
 #define PWM_SIFIVE_DEFAULT_PERIOD	10000000
 
 struct pwm_sifive_ddata {
-	struct pwm_chip	chip;
+	struct pwm_chip *chip;
 	struct mutex lock; /* lock to protect user_count and approx_period */
 	struct notifier_block notifier;
 	struct clk *clk;
@@ -54,7 +54,7 @@ struct pwm_sifive_ddata {
 static inline
 struct pwm_sifive_ddata *pwm_sifive_chip_to_ddata(struct pwm_chip *chip)
 {
-	return container_of(chip, struct pwm_sifive_ddata, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int pwm_sifive_request(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -102,7 +102,7 @@ static void pwm_sifive_update_clock(struct pwm_sifive_ddata *ddata,
 	/* As scale <= 15 the shift operation cannot overflow. */
 	num = (unsigned long long)NSEC_PER_SEC << (PWM_SIFIVE_CMPWIDTH + scale);
 	ddata->real_period = div64_ul(num, rate);
-	dev_dbg(pwmchip_parent(&ddata->chip),
+	dev_dbg(pwmchip_parent(ddata->chip),
 		"New real_period = %u ns\n", ddata->real_period);
 }
 
@@ -230,15 +230,14 @@ static int pwm_sifive_probe(struct platform_device *pdev)
 	u32 val;
 	unsigned int enabled_pwms = 0, enabled_clks = 1;
 
-	ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
-	if (!ddata)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(dev, 4, sizeof(*ddata));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	ddata = pwm_sifive_chip_to_ddata(chip);
+	ddata->chip = chip;
 
 	mutex_init(&ddata->lock);
-	chip = &ddata->chip;
-	chip->dev = dev;
 	chip->ops = &pwm_sifive_ops;
-	chip->npwm = 4;
 
 	ddata->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(ddata->regs))
@@ -296,7 +295,7 @@ static int pwm_sifive_probe(struct platform_device *pdev)
 		goto unregister_clk;
 	}
 
-	platform_set_drvdata(pdev, ddata);
+	platform_set_drvdata(pdev, chip);
 	dev_dbg(dev, "SiFive PWM chip registered %d PWMs\n", chip->npwm);
 
 	return 0;
@@ -314,15 +313,16 @@ static int pwm_sifive_probe(struct platform_device *pdev)
 
 static void pwm_sifive_remove(struct platform_device *dev)
 {
-	struct pwm_sifive_ddata *ddata = platform_get_drvdata(dev);
+	struct pwm_chip *chip = platform_get_drvdata(dev);
+	struct pwm_sifive_ddata *ddata = pwm_sifive_chip_to_ddata(chip);
 	struct pwm_device *pwm;
 	int ch;
 
-	pwmchip_remove(&ddata->chip);
+	pwmchip_remove(chip);
 	clk_notifier_unregister(ddata->clk, &ddata->notifier);
 
-	for (ch = 0; ch < ddata->chip.npwm; ch++) {
-		pwm = &ddata->chip.pwms[ch];
+	for (ch = 0; ch < chip->npwm; ch++) {
+		pwm = &chip->pwms[ch];
 		if (pwm->state.enabled)
 			clk_disable(ddata->clk);
 	}
-- 
2.42.0

[PATCH v4 090/115] pwm: sl28cpld: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-sl28cpld driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-sl28cpld.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/pwm/pwm-sl28cpld.c b/drivers/pwm/pwm-sl28cpld.c
index 88b01ff9e460..934378d6a002 100644
--- a/drivers/pwm/pwm-sl28cpld.c
+++ b/drivers/pwm/pwm-sl28cpld.c
@@ -81,14 +81,13 @@
 	regmap_write((priv)->regmap, (priv)->offset + (reg), (val))
 
 struct sl28cpld_pwm {
-	struct pwm_chip chip;
 	struct regmap *regmap;
 	u32 offset;
 };
 
 static inline struct sl28cpld_pwm *sl28cpld_pwm_from_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct sl28cpld_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int sl28cpld_pwm_get_state(struct pwm_chip *chip,
@@ -213,9 +212,10 @@ static int sl28cpld_pwm_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*priv));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	priv = sl28cpld_pwm_from_chip(chip);
 
 	priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 	if (!priv->regmap) {
@@ -231,10 +231,7 @@ static int sl28cpld_pwm_probe(struct platform_device *pdev)
 	}
 
 	/* Initialize the pwm_chip structure */
-	chip = &priv->chip;
-	chip->dev = &pdev->dev;
 	chip->ops = &sl28cpld_pwm_ops;
-	chip->npwm = 1;
 
 	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret) {
-- 
2.42.0

[PATCH v4 091/115] pwm: spear: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-spear driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-spear.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-spear.c b/drivers/pwm/pwm-spear.c
index ff991319feef..f1e08cb28ea6 100644
--- a/drivers/pwm/pwm-spear.c
+++ b/drivers/pwm/pwm-spear.c
@@ -53,12 +53,11 @@
 struct spear_pwm_chip {
 	void __iomem *mmio_base;
 	struct clk *clk;
-	struct pwm_chip chip;
 };
 
 static inline struct spear_pwm_chip *to_spear_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct spear_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static inline u32 spear_pwm_readl(struct spear_pwm_chip *chip, unsigned int num,
@@ -194,13 +193,15 @@ static const struct pwm_ops spear_pwm_ops = {
 static int spear_pwm_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
+	struct pwm_chip *chip;
 	struct spear_pwm_chip *pc;
 	int ret;
 	u32 val;
 
-	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
-	if (!pc)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, NUM_PWM, sizeof(*pc));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	pc = to_spear_pwm_chip(chip);
 
 	pc->mmio_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(pc->mmio_base))
@@ -211,9 +212,7 @@ static int spear_pwm_probe(struct platform_device *pdev)
 		return dev_err_probe(&pdev->dev, PTR_ERR(pc->clk),
 				     "Failed to get clock\n");
 
-	pc->chip.dev = &pdev->dev;
-	pc->chip.ops = &spear_pwm_ops;
-	pc->chip.npwm = NUM_PWM;
+	chip->ops = &spear_pwm_ops;
 
 	if (of_device_is_compatible(np, "st,spear1340-pwm")) {
 		ret = clk_enable(pc->clk);
@@ -232,7 +231,7 @@ static int spear_pwm_probe(struct platform_device *pdev)
 		clk_disable(pc->clk);
 	}
 
-	ret = devm_pwmchip_add(&pdev->dev, &pc->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0)
 		return dev_err_probe(&pdev->dev, ret, "pwmchip_add() failed\n");
 
-- 
2.42.0

[PATCH v4 092/115] pwm: sprd: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-sprd driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-sprd.c | 50 +++++++++++++++++++++---------------------
 1 file changed, 25 insertions(+), 25 deletions(-)

diff --git a/drivers/pwm/pwm-sprd.c b/drivers/pwm/pwm-sprd.c
index 77939e161006..4cecc20f873c 100644
--- a/drivers/pwm/pwm-sprd.c
+++ b/drivers/pwm/pwm-sprd.c
@@ -35,14 +35,13 @@ struct sprd_pwm_chn {
 struct sprd_pwm_chip {
 	void __iomem *base;
 	struct device *dev;
-	struct pwm_chip chip;
 	int num_pwms;
 	struct sprd_pwm_chn chn[SPRD_PWM_CHN_NUM];
 };
 
 static inline struct sprd_pwm_chip* sprd_pwm_from_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct sprd_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 /*
@@ -215,65 +214,66 @@ static const struct pwm_ops sprd_pwm_ops = {
 	.get_state = sprd_pwm_get_state,
 };
 
-static int sprd_pwm_clk_init(struct sprd_pwm_chip *spc)
+static int sprd_pwm_clk_init(struct device *dev,
+			     struct sprd_pwm_chn chn[SPRD_PWM_CHN_NUM])
 {
 	struct clk *clk_pwm;
 	int ret, i;
 
 	for (i = 0; i < SPRD_PWM_CHN_NUM; i++) {
-		struct sprd_pwm_chn *chn = &spc->chn[i];
 		int j;
 
 		for (j = 0; j < SPRD_PWM_CHN_CLKS_NUM; ++j)
-			chn->clks[j].id =
+			chn[i].clks[j].id =
 				sprd_pwm_clks[i * SPRD_PWM_CHN_CLKS_NUM + j];
 
-		ret = devm_clk_bulk_get(spc->dev, SPRD_PWM_CHN_CLKS_NUM,
-					chn->clks);
+		ret = devm_clk_bulk_get(dev, SPRD_PWM_CHN_CLKS_NUM,
+					chn[i].clks);
 		if (ret) {
 			if (ret == -ENOENT)
 				break;
 
-			return dev_err_probe(spc->dev, ret,
+			return dev_err_probe(dev, ret,
 					     "failed to get channel clocks\n");
 		}
 
-		clk_pwm = chn->clks[SPRD_PWM_CHN_OUTPUT_CLK].clk;
-		chn->clk_rate = clk_get_rate(clk_pwm);
+		clk_pwm = chn[i].clks[SPRD_PWM_CHN_OUTPUT_CLK].clk;
+		chn[i].clk_rate = clk_get_rate(clk_pwm);
 	}
 
 	if (!i)
-		return dev_err_probe(spc->dev, -ENODEV, "no available PWM channels\n");
+		return dev_err_probe(dev, -ENODEV, "no available PWM channels\n");
 
-	spc->num_pwms = i;
-
-	return 0;
+	return i;
 }
 
 static int sprd_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct sprd_pwm_chip *spc;
+	struct sprd_pwm_chn chn[SPRD_PWM_CHN_NUM];
 	int ret;
 
-	spc = devm_kzalloc(&pdev->dev, sizeof(*spc), GFP_KERNEL);
-	if (!spc)
-		return -ENOMEM;
+	ret = sprd_pwm_clk_init(&pdev->dev, chn);
+	if (ret < 0)
+		return ret;
+
+	chip = devm_pwmchip_alloc(&pdev->dev, ret, sizeof(*spc));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	spc = sprd_pwm_from_chip(chip);
 
 	spc->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(spc->base))
 		return PTR_ERR(spc->base);
 
 	spc->dev = &pdev->dev;
+	memcpy(spc->chn, chn, sizeof(chn));
 
-	ret = sprd_pwm_clk_init(spc);
-	if (ret)
-		return ret;
+	chip->ops = &sprd_pwm_ops;
+	chip->npwm = spc->num_pwms;
 
-	spc->chip.dev = &pdev->dev;
-	spc->chip.ops = &sprd_pwm_ops;
-	spc->chip.npwm = spc->num_pwms;
-
-	ret = devm_pwmchip_add(&pdev->dev, &spc->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret)
 		dev_err(&pdev->dev, "failed to add PWM chip\n");
 
-- 
2.42.0

[PATCH v4 093/115] pwm: sti: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-sti driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-sti.c | 34 +++++++++++++++++-----------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/pwm/pwm-sti.c b/drivers/pwm/pwm-sti.c
index 6cf55cf34d39..3a31e342e536 100644
--- a/drivers/pwm/pwm-sti.c
+++ b/drivers/pwm/pwm-sti.c
@@ -94,7 +94,6 @@ struct sti_pwm_chip {
 	struct regmap_field *pwm_cpt_en;
 	struct regmap_field *pwm_cpt_int_en;
 	struct regmap_field *pwm_cpt_int_stat;
-	struct pwm_chip chip;
 	struct pwm_device *cur;
 	unsigned long configured;
 	unsigned int en_count;
@@ -114,7 +113,7 @@ static const struct reg_field sti_pwm_regfields[MAX_REGFIELDS] = {
 
 static inline struct sti_pwm_chip *to_sti_pwmchip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct sti_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 /*
@@ -503,10 +502,6 @@ static int sti_pwm_probe_dt(struct sti_pwm_chip *pc)
 	u32 num_devs;
 	int ret;
 
-	ret = of_property_read_u32(np, "st,pwm-num-chan", &num_devs);
-	if (!ret)
-		cdata->pwm_num_devs = num_devs;
-
 	ret = of_property_read_u32(np, "st,capture-num-chan", &num_devs);
 	if (!ret)
 		cdata->cpt_num_devs = num_devs;
@@ -561,13 +556,18 @@ static int sti_pwm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct sti_pwm_compat_data *cdata;
+	struct pwm_chip *chip;
 	struct sti_pwm_chip *pc;
 	unsigned int i;
 	int irq, ret;
+	u32 num_devs = 0;
 
-	pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
-	if (!pc)
-		return -ENOMEM;
+	of_property_read_u32(dev->of_node, "st,pwm-num-chan", &num_devs);
+
+	chip = devm_pwmchip_alloc(dev, num_devs, sizeof(*pc));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	pc = to_sti_pwmchip(chip);
 
 	cdata = devm_kzalloc(dev, sizeof(*cdata), GFP_KERNEL);
 	if (!cdata)
@@ -600,7 +600,7 @@ static int sti_pwm_probe(struct platform_device *pdev)
 	cdata->reg_fields = sti_pwm_regfields;
 	cdata->max_prescale = 0xff;
 	cdata->max_pwm_cnt = 255;
-	cdata->pwm_num_devs = 0;
+	cdata->pwm_num_devs = num_devs;
 	cdata->cpt_num_devs = 0;
 
 	pc->cdata = cdata;
@@ -644,9 +644,8 @@ static int sti_pwm_probe(struct platform_device *pdev)
 			return -ENOMEM;
 	}
 
-	pc->chip.dev = dev;
-	pc->chip.ops = &sti_pwm_ops;
-	pc->chip.npwm = pc->cdata->pwm_num_devs;
+	chip->ops = &sti_pwm_ops;
+	chip->npwm = pc->cdata->pwm_num_devs;
 
 	for (i = 0; i < cdata->cpt_num_devs; i++) {
 		struct sti_cpt_ddata *ddata = &cdata->ddata[i];
@@ -655,23 +654,24 @@ static int sti_pwm_probe(struct platform_device *pdev)
 		mutex_init(&ddata->lock);
 	}
 
-	ret = pwmchip_add(&pc->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0) {
 		clk_unprepare(pc->pwm_clk);
 		clk_unprepare(pc->cpt_clk);
 		return ret;
 	}
 
-	platform_set_drvdata(pdev, pc);
+	platform_set_drvdata(pdev, chip);
 
 	return 0;
 }
 
 static void sti_pwm_remove(struct platform_device *pdev)
 {
-	struct sti_pwm_chip *pc = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct sti_pwm_chip *pc = to_sti_pwmchip(chip);
 
-	pwmchip_remove(&pc->chip);
+	pwmchip_remove(chip);
 
 	clk_unprepare(pc->pwm_clk);
 	clk_unprepare(pc->cpt_clk);
-- 
2.42.0

[PATCH v4 094/115] pwm: stm32-lp: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-stm32-lp driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-stm32-lp.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/drivers/pwm/pwm-stm32-lp.c b/drivers/pwm/pwm-stm32-lp.c
index 3754faeca838..579fea9a0da4 100644
--- a/drivers/pwm/pwm-stm32-lp.c
+++ b/drivers/pwm/pwm-stm32-lp.c
@@ -18,14 +18,13 @@
 #include <linux/pwm.h>
 
 struct stm32_pwm_lp {
-	struct pwm_chip chip;
 	struct clk *clk;
 	struct regmap *regmap;
 };
 
 static inline struct stm32_pwm_lp *to_stm32_pwm_lp(struct pwm_chip *chip)
 {
-	return container_of(chip, struct stm32_pwm_lp, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 /* STM32 Low-Power Timer is preceded by a configurable power-of-2 prescaler */
@@ -196,20 +195,20 @@ static const struct pwm_ops stm32_pwm_lp_ops = {
 static int stm32_pwm_lp_probe(struct platform_device *pdev)
 {
 	struct stm32_lptimer *ddata = dev_get_drvdata(pdev->dev.parent);
+	struct pwm_chip *chip;
 	struct stm32_pwm_lp *priv;
 	int ret;
 
-	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*priv));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	priv = to_stm32_pwm_lp(chip);
 
 	priv->regmap = ddata->regmap;
 	priv->clk = ddata->clk;
-	priv->chip.dev = &pdev->dev;
-	priv->chip.ops = &stm32_pwm_lp_ops;
-	priv->chip.npwm = 1;
+	chip->ops = &stm32_pwm_lp_ops;
 
-	ret = devm_pwmchip_add(&pdev->dev, &priv->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0)
 		return ret;
 
@@ -220,13 +219,13 @@ static int stm32_pwm_lp_probe(struct platform_device *pdev)
 
 static int stm32_pwm_lp_suspend(struct device *dev)
 {
-	struct stm32_pwm_lp *priv = dev_get_drvdata(dev);
+	struct pwm_chip *chip = dev_get_drvdata(dev);
 	struct pwm_state state;
 
-	pwm_get_state(&priv->chip.pwms[0], &state);
+	pwm_get_state(&chip->pwms[0], &state);
 	if (state.enabled) {
 		dev_err(dev, "The consumer didn't stop us (%s)\n",
-			priv->chip.pwms[0].label);
+			chip->pwms[0].label);
 		return -EBUSY;
 	}
 
-- 
2.42.0

[PATCH v4 095/115] pwm: stm32: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-stm32 driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-stm32.c | 51 ++++++++++++++++++++++-------------------
 1 file changed, 27 insertions(+), 24 deletions(-)

diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c
index d1dc9e3ca2a1..aae8bd4f40ab 100644
--- a/drivers/pwm/pwm-stm32.c
+++ b/drivers/pwm/pwm-stm32.c
@@ -27,7 +27,6 @@ struct stm32_breakinput {
 };
 
 struct stm32_pwm {
-	struct pwm_chip chip;
 	struct mutex lock; /* protect pwm config/enable */
 	struct clk *clk;
 	struct regmap *regmap;
@@ -40,7 +39,7 @@ struct stm32_pwm {
 
 static inline struct stm32_pwm *to_stm32_pwm_dev(struct pwm_chip *chip)
 {
-	return container_of(chip, struct stm32_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static u32 active_channels(struct stm32_pwm *dev)
@@ -90,11 +89,12 @@ static u32 active_channels(struct stm32_pwm *dev)
  * - Period     = t2 - t0
  * - Duty cycle = t1 - t0
  */
-static int stm32_pwm_raw_capture(struct stm32_pwm *priv, struct pwm_device *pwm,
+static int stm32_pwm_raw_capture(struct pwm_chip *chip, struct pwm_device *pwm,
 				 unsigned long tmo_ms, u32 *raw_prd,
 				 u32 *raw_dty)
 {
-	struct device *parent = pwmchip_parent(&priv->chip)->parent;
+	struct stm32_pwm *priv = to_stm32_pwm_dev(chip);
+	struct device *parent = pwmchip_parent(chip)->parent;
 	enum stm32_timers_dmas dma_id;
 	u32 ccen, ccr;
 	int ret;
@@ -208,7 +208,7 @@ static int stm32_pwm_capture(struct pwm_chip *chip, struct pwm_device *pwm,
 			   TIM_CCER_CC12P : TIM_CCER_CC34P, pwm->hwpwm < 2 ?
 			   TIM_CCER_CC2P : TIM_CCER_CC4P);
 
-	ret = stm32_pwm_raw_capture(priv, pwm, tmo_ms, &raw_prd, &raw_dty);
+	ret = stm32_pwm_raw_capture(chip, pwm, tmo_ms, &raw_prd, &raw_dty);
 	if (ret)
 		goto stop;
 
@@ -229,7 +229,7 @@ static int stm32_pwm_capture(struct pwm_chip *chip, struct pwm_device *pwm,
 		/* 2nd measure with new scale */
 		psc /= scale;
 		regmap_write(priv->regmap, TIM_PSC, psc);
-		ret = stm32_pwm_raw_capture(priv, pwm, tmo_ms, &raw_prd,
+		ret = stm32_pwm_raw_capture(chip, pwm, tmo_ms, &raw_prd,
 					    &raw_dty);
 		if (ret)
 			goto stop;
@@ -257,7 +257,7 @@ static int stm32_pwm_capture(struct pwm_chip *chip, struct pwm_device *pwm,
 			   FIELD_PREP(TIM_CCMR_IC1PSC, icpsc) |
 			   FIELD_PREP(TIM_CCMR_IC2PSC, icpsc));
 
-	ret = stm32_pwm_raw_capture(priv, pwm, tmo_ms, &raw_prd, &raw_dty);
+	ret = stm32_pwm_raw_capture(chip, pwm, tmo_ms, &raw_prd, &raw_dty);
 	if (ret)
 		goto stop;
 
@@ -605,7 +605,7 @@ static void stm32_pwm_detect_complementary(struct stm32_pwm *priv)
 	priv->have_complementary_output = (ccer != 0);
 }
 
-static unsigned int stm32_pwm_detect_channels(struct stm32_pwm *priv,
+static unsigned int stm32_pwm_detect_channels(struct stm32_timers *ddata,
 					      unsigned int *num_enabled)
 {
 	u32 ccer, ccer_backup;
@@ -614,10 +614,10 @@ static unsigned int stm32_pwm_detect_channels(struct stm32_pwm *priv,
 	 * If channels enable bits don't exist writing 1 will have no
 	 * effect so we can detect and count them.
 	 */
-	regmap_read(priv->regmap, TIM_CCER, &ccer_backup);
-	regmap_set_bits(priv->regmap, TIM_CCER, TIM_CCER_CCXE);
-	regmap_read(priv->regmap, TIM_CCER, &ccer);
-	regmap_write(priv->regmap, TIM_CCER, ccer_backup);
+	regmap_read(ddata->regmap, TIM_CCER, &ccer_backup);
+	regmap_set_bits(ddata->regmap, TIM_CCER, TIM_CCER_CCXE);
+	regmap_read(ddata->regmap, TIM_CCER, &ccer);
+	regmap_write(ddata->regmap, TIM_CCER, ccer_backup);
 
 	*num_enabled = hweight32(ccer_backup & TIM_CCER_CCXE);
 
@@ -632,11 +632,14 @@ static int stm32_pwm_probe(struct platform_device *pdev)
 	struct stm32_pwm *priv;
 	unsigned int num_enabled;
 	unsigned int i;
+	struct pwm_chip *chip;
 	int ret;
 
-	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(dev, stm32_pwm_detect_channels(ddata, &num_enabled),
+				  sizeof(*priv));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	priv = to_stm32_pwm_dev(chip);
 
 	mutex_init(&priv->lock);
 	priv->regmap = ddata->regmap;
@@ -652,37 +655,36 @@ static int stm32_pwm_probe(struct platform_device *pdev)
 
 	stm32_pwm_detect_complementary(priv);
 
-	priv->chip.dev = dev;
-	priv->chip.ops = &stm32pwm_ops;
-	priv->chip.npwm = stm32_pwm_detect_channels(priv, &num_enabled);
+	chip->ops = &stm32pwm_ops;
 
 	/* Initialize clock refcount to number of enabled PWM channels. */
 	for (i = 0; i < num_enabled; i++)
 		clk_enable(priv->clk);
 
-	ret = devm_pwmchip_add(dev, &priv->chip);
+	ret = devm_pwmchip_add(dev, chip);
 	if (ret < 0)
 		return ret;
 
-	platform_set_drvdata(pdev, priv);
+	platform_set_drvdata(pdev, chip);
 
 	return 0;
 }
 
 static int stm32_pwm_suspend(struct device *dev)
 {
-	struct stm32_pwm *priv = dev_get_drvdata(dev);
+	struct pwm_chip *chip = dev_get_drvdata(dev);
+	struct stm32_pwm *priv = to_stm32_pwm_dev(chip);
 	unsigned int i;
 	u32 ccer, mask;
 
 	/* Look for active channels */
 	ccer = active_channels(priv);
 
-	for (i = 0; i < priv->chip.npwm; i++) {
+	for (i = 0; i < chip->npwm; i++) {
 		mask = TIM_CCER_CC1E << (i * 4);
 		if (ccer & mask) {
 			dev_err(dev, "PWM %u still in use by consumer %s\n",
-				i, priv->chip.pwms[i].label);
+				i, chip->pwms[i].label);
 			return -EBUSY;
 		}
 	}
@@ -692,7 +694,8 @@ static int stm32_pwm_suspend(struct device *dev)
 
 static int stm32_pwm_resume(struct device *dev)
 {
-	struct stm32_pwm *priv = dev_get_drvdata(dev);
+	struct pwm_chip *chip = dev_get_drvdata(dev);
+	struct stm32_pwm *priv = to_stm32_pwm_dev(chip);
 	int ret;
 
 	ret = pinctrl_pm_select_default_state(dev);
-- 
2.42.0

[PATCH v4 096/115] pwm: stmpe: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-stmpe driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-stmpe.c | 38 ++++++++++++++++++++------------------
 1 file changed, 20 insertions(+), 18 deletions(-)

diff --git a/drivers/pwm/pwm-stmpe.c b/drivers/pwm/pwm-stmpe.c
index 941b1e218e35..b9d06bcc6e93 100644
--- a/drivers/pwm/pwm-stmpe.c
+++ b/drivers/pwm/pwm-stmpe.c
@@ -27,13 +27,12 @@
 
 struct stmpe_pwm {
 	struct stmpe *stmpe;
-	struct pwm_chip chip;
 	u8 last_duty;
 };
 
 static inline struct stmpe_pwm *to_stmpe_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct stmpe_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int stmpe_24xx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -292,33 +291,36 @@ static const struct pwm_ops stmpe_24xx_pwm_ops = {
 static int __init stmpe_pwm_probe(struct platform_device *pdev)
 {
 	struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
+	struct pwm_chip *chip;
 	struct stmpe_pwm *stmpe_pwm;
 	int ret;
 
-	stmpe_pwm = devm_kzalloc(&pdev->dev, sizeof(*stmpe_pwm), GFP_KERNEL);
-	if (!stmpe_pwm)
-		return -ENOMEM;
+	switch (stmpe->partnum) {
+	case STMPE2401:
+	case STMPE2403:
+		break;
+	case STMPE1601:
+		return dev_err_probe(&pdev->dev, -EINVAL,
+				     "STMPE1601 not yet supported\n");
+	default:
+		return dev_err_probe(&pdev->dev, -EINVAL,
+				     "Unknown STMPE PWM\n");
+	}
+
+	chip = devm_pwmchip_alloc(&pdev->dev, 3, sizeof(*stmpe_pwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	stmpe_pwm = to_stmpe_pwm(chip);
 
 	stmpe_pwm->stmpe = stmpe;
-	stmpe_pwm->chip.dev = &pdev->dev;
 
-	if (stmpe->partnum == STMPE2401 || stmpe->partnum == STMPE2403) {
-		stmpe_pwm->chip.ops = &stmpe_24xx_pwm_ops;
-		stmpe_pwm->chip.npwm = 3;
-	} else {
-		if (stmpe->partnum == STMPE1601)
-			dev_err(&pdev->dev, "STMPE1601 not yet supported\n");
-		else
-			dev_err(&pdev->dev, "Unknown STMPE PWM\n");
-
-		return -ENODEV;
-	}
+	chip->ops = &stmpe_24xx_pwm_ops;
 
 	ret = stmpe_enable(stmpe, STMPE_BLOCK_PWM);
 	if (ret)
 		return ret;
 
-	ret = pwmchip_add(&stmpe_pwm->chip);
+	ret = pwmchip_add(chip);
 	if (ret) {
 		stmpe_disable(stmpe, STMPE_BLOCK_PWM);
 		return ret;
-- 
2.42.0

[PATCH v4 097/115] pwm: sun4i: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-sun4i driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-sun4i.c | 34 +++++++++++++++++++---------------
 1 file changed, 19 insertions(+), 15 deletions(-)

diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c
index 44edf1ce5739..36a8dc65b19c 100644
--- a/drivers/pwm/pwm-sun4i.c
+++ b/drivers/pwm/pwm-sun4i.c
@@ -81,7 +81,6 @@ struct sun4i_pwm_data {
 };
 
 struct sun4i_pwm_chip {
-	struct pwm_chip chip;
 	struct clk *bus_clk;
 	struct clk *clk;
 	struct reset_control *rst;
@@ -92,7 +91,7 @@ struct sun4i_pwm_chip {
 
 static inline struct sun4i_pwm_chip *to_sun4i_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct sun4i_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static inline u32 sun4i_pwm_readl(struct sun4i_pwm_chip *chip,
@@ -384,17 +383,22 @@ MODULE_DEVICE_TABLE(of, sun4i_pwm_dt_ids);
 
 static int sun4i_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct sun4i_pwm_chip *sun4ichip;
+	const struct sun4i_pwm_data *data;
 	int ret;
 
-	sun4ichip = devm_kzalloc(&pdev->dev, sizeof(*sun4ichip), GFP_KERNEL);
-	if (!sun4ichip)
-		return -ENOMEM;
-
-	sun4ichip->data = of_device_get_match_data(&pdev->dev);
-	if (!sun4ichip->data)
+	data = of_device_get_match_data(&pdev->dev);
+	if (!data)
 		return -ENODEV;
 
+	chip = devm_pwmchip_alloc(&pdev->dev, data->npwm, sizeof(*sun4ichip));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	sun4ichip = to_sun4i_pwm_chip(chip);
+
+	sun4ichip->data = data;
+
 	sun4ichip->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(sun4ichip->base))
 		return PTR_ERR(sun4ichip->base);
@@ -451,19 +455,18 @@ static int sun4i_pwm_probe(struct platform_device *pdev)
 		goto err_bus;
 	}
 
-	sun4ichip->chip.dev = &pdev->dev;
-	sun4ichip->chip.ops = &sun4i_pwm_ops;
-	sun4ichip->chip.npwm = sun4ichip->data->npwm;
+	chip->ops = &sun4i_pwm_ops;
+	chip->npwm = sun4ichip->data->npwm;
 
 	spin_lock_init(&sun4ichip->ctrl_lock);
 
-	ret = pwmchip_add(&sun4ichip->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
 		goto err_pwm_add;
 	}
 
-	platform_set_drvdata(pdev, sun4ichip);
+	platform_set_drvdata(pdev, chip);
 
 	return 0;
 
@@ -477,9 +480,10 @@ static int sun4i_pwm_probe(struct platform_device *pdev)
 
 static void sun4i_pwm_remove(struct platform_device *pdev)
 {
-	struct sun4i_pwm_chip *sun4ichip = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct sun4i_pwm_chip *sun4ichip = to_sun4i_pwm_chip(chip);
 
-	pwmchip_remove(&sun4ichip->chip);
+	pwmchip_remove(chip);
 
 	clk_disable_unprepare(sun4ichip->bus_clk);
 	reset_control_assert(sun4ichip->rst);
-- 
2.42.0

[PATCH v4 098/115] pwm: sunplus: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-sunplus driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-sunplus.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-sunplus.c b/drivers/pwm/pwm-sunplus.c
index 773e2f80526e..b342b843247b 100644
--- a/drivers/pwm/pwm-sunplus.c
+++ b/drivers/pwm/pwm-sunplus.c
@@ -43,14 +43,13 @@
 #define SP7021_PWM_NUM			4
 
 struct sunplus_pwm {
-	struct pwm_chip chip;
 	void __iomem *base;
 	struct clk *clk;
 };
 
 static inline struct sunplus_pwm *to_sunplus_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct sunplus_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int sunplus_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -175,12 +174,14 @@ static void sunplus_pwm_clk_release(void *data)
 static int sunplus_pwm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct pwm_chip *chip;
 	struct sunplus_pwm *priv;
 	int ret;
 
-	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(dev, SP7021_PWM_NUM, sizeof(*priv));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	priv = to_sunplus_pwm(chip);
 
 	priv->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(priv->base))
@@ -203,11 +204,9 @@ static int sunplus_pwm_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	priv->chip.dev = dev;
-	priv->chip.ops = &sunplus_pwm_ops;
-	priv->chip.npwm = SP7021_PWM_NUM;
+	chip->ops = &sunplus_pwm_ops;
 
-	ret = devm_pwmchip_add(dev, &priv->chip);
+	ret = devm_pwmchip_add(dev, chip);
 	if (ret < 0)
 		return dev_err_probe(dev, ret, "Cannot register sunplus PWM\n");
 
-- 
2.42.0

[PATCH v4 099/115] pwm: tegra: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-tegra driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-tegra.c | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/pwm/pwm-tegra.c b/drivers/pwm/pwm-tegra.c
index 82ee2f0754f9..5eb7bdfb84d8 100644
--- a/drivers/pwm/pwm-tegra.c
+++ b/drivers/pwm/pwm-tegra.c
@@ -65,7 +65,6 @@ struct tegra_pwm_soc {
 };
 
 struct tegra_pwm_chip {
-	struct pwm_chip chip;
 	struct device *dev;
 
 	struct clk *clk;
@@ -81,7 +80,7 @@ struct tegra_pwm_chip {
 
 static inline struct tegra_pwm_chip *to_tegra_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct tegra_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static inline u32 pwm_readl(struct tegra_pwm_chip *pc, unsigned int offset)
@@ -272,14 +271,19 @@ static const struct pwm_ops tegra_pwm_ops = {
 
 static int tegra_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct tegra_pwm_chip *pc;
+	const struct tegra_pwm_soc *soc;
 	int ret;
 
-	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
-	if (!pc)
-		return -ENOMEM;
+	soc = of_device_get_match_data(&pdev->dev);
 
-	pc->soc = of_device_get_match_data(&pdev->dev);
+	chip = devm_pwmchip_alloc(&pdev->dev, soc->num_channels, sizeof(*pc));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	pc = to_tegra_pwm_chip(chip);
+
+	pc->soc = soc;
 	pc->dev = &pdev->dev;
 
 	pc->regs = devm_platform_ioremap_resource(pdev, 0);
@@ -328,11 +332,9 @@ static int tegra_pwm_probe(struct platform_device *pdev)
 
 	reset_control_deassert(pc->rst);
 
-	pc->chip.dev = &pdev->dev;
-	pc->chip.ops = &tegra_pwm_ops;
-	pc->chip.npwm = pc->soc->num_channels;
+	chip->ops = &tegra_pwm_ops;
 
-	ret = pwmchip_add(&pc->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
 		reset_control_assert(pc->rst);
@@ -350,9 +352,10 @@ static int tegra_pwm_probe(struct platform_device *pdev)
 
 static void tegra_pwm_remove(struct platform_device *pdev)
 {
-	struct tegra_pwm_chip *pc = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct tegra_pwm_chip *pc = to_tegra_pwm_chip(chip);
 
-	pwmchip_remove(&pc->chip);
+	pwmchip_remove(chip);
 
 	reset_control_assert(pc->rst);
 
-- 
2.42.0

[PATCH v4 100/115] pwm: tiecap: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-tegra driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-tiecap.c   | 43 ++++++++++++++++---------------
 drivers/pwm/pwm-tiehrpwm.c | 52 ++++++++++++++++++++------------------
 2 files changed, 51 insertions(+), 44 deletions(-)

diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
index 8c4f67774f24..e4c3ca4e74d9 100644
--- a/drivers/pwm/pwm-tiecap.c
+++ b/drivers/pwm/pwm-tiecap.c
@@ -32,7 +32,6 @@ struct ecap_context {
 };
 
 struct ecap_pwm_chip {
-	struct pwm_chip chip;
 	unsigned int clk_rate;
 	void __iomem *mmio_base;
 	struct ecap_context ctx;
@@ -40,7 +39,7 @@ struct ecap_pwm_chip {
 
 static inline struct ecap_pwm_chip *to_ecap_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct ecap_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 /*
@@ -217,13 +216,15 @@ MODULE_DEVICE_TABLE(of, ecap_of_match);
 static int ecap_pwm_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
+	struct pwm_chip *chip;
 	struct ecap_pwm_chip *pc;
 	struct clk *clk;
 	int ret;
 
-	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
-	if (!pc)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*pc));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	pc = to_ecap_pwm_chip(chip);
 
 	clk = devm_clk_get(&pdev->dev, "fck");
 	if (IS_ERR(clk)) {
@@ -244,21 +245,19 @@ static int ecap_pwm_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	pc->chip.dev = &pdev->dev;
-	pc->chip.ops = &ecap_pwm_ops;
-	pc->chip.npwm = 1;
+	chip->ops = &ecap_pwm_ops;
 
 	pc->mmio_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(pc->mmio_base))
 		return PTR_ERR(pc->mmio_base);
 
-	ret = devm_pwmchip_add(&pdev->dev, &pc->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
 		return ret;
 	}
 
-	platform_set_drvdata(pdev, pc);
+	platform_set_drvdata(pdev, chip);
 	pm_runtime_enable(&pdev->dev);
 
 	return 0;
@@ -269,17 +268,21 @@ static void ecap_pwm_remove(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 }
 
-static void ecap_pwm_save_context(struct ecap_pwm_chip *pc)
+static void ecap_pwm_save_context(struct pwm_chip *chip)
 {
-	pm_runtime_get_sync(pwmchip_parent(&pc->chip));
+	struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
+
+	pm_runtime_get_sync(pwmchip_parent(chip));
 	pc->ctx.ecctl2 = readw(pc->mmio_base + ECCTL2);
 	pc->ctx.cap4 = readl(pc->mmio_base + CAP4);
 	pc->ctx.cap3 = readl(pc->mmio_base + CAP3);
-	pm_runtime_put_sync(pwmchip_parent(&pc->chip));
+	pm_runtime_put_sync(pwmchip_parent(chip));
 }
 
-static void ecap_pwm_restore_context(struct ecap_pwm_chip *pc)
+static void ecap_pwm_restore_context(struct pwm_chip *chip)
 {
+	struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
+
 	writel(pc->ctx.cap3, pc->mmio_base + CAP3);
 	writel(pc->ctx.cap4, pc->mmio_base + CAP4);
 	writew(pc->ctx.ecctl2, pc->mmio_base + ECCTL2);
@@ -287,10 +290,10 @@ static void ecap_pwm_restore_context(struct ecap_pwm_chip *pc)
 
 static int ecap_pwm_suspend(struct device *dev)
 {
-	struct ecap_pwm_chip *pc = dev_get_drvdata(dev);
-	struct pwm_device *pwm = pc->chip.pwms;
+	struct pwm_chip *chip = dev_get_drvdata(dev);
+	struct pwm_device *pwm = chip->pwms;
 
-	ecap_pwm_save_context(pc);
+	ecap_pwm_save_context(chip);
 
 	/* Disable explicitly if PWM is running */
 	if (pwm_is_enabled(pwm))
@@ -301,14 +304,14 @@ static int ecap_pwm_suspend(struct device *dev)
 
 static int ecap_pwm_resume(struct device *dev)
 {
-	struct ecap_pwm_chip *pc = dev_get_drvdata(dev);
-	struct pwm_device *pwm = pc->chip.pwms;
+	struct pwm_chip *chip = dev_get_drvdata(dev);
+	struct pwm_device *pwm = chip->pwms;
 
 	/* Enable explicitly if PWM was running */
 	if (pwm_is_enabled(pwm))
 		pm_runtime_get_sync(dev);
 
-	ecap_pwm_restore_context(pc);
+	ecap_pwm_restore_context(chip);
 	return 0;
 }
 
diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
index 80e22e373bc5..219b51faaf60 100644
--- a/drivers/pwm/pwm-tiehrpwm.c
+++ b/drivers/pwm/pwm-tiehrpwm.c
@@ -105,7 +105,6 @@ struct ehrpwm_context {
 };
 
 struct ehrpwm_pwm_chip {
-	struct pwm_chip chip;
 	unsigned long clk_rate;
 	void __iomem *mmio_base;
 	unsigned long period_cycles[NUM_PWM_CHANNEL];
@@ -116,7 +115,7 @@ struct ehrpwm_pwm_chip {
 
 static inline struct ehrpwm_pwm_chip *to_ehrpwm_pwm_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct ehrpwm_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static inline u16 ehrpwm_read(void __iomem *base, unsigned int offset)
@@ -449,13 +448,15 @@ MODULE_DEVICE_TABLE(of, ehrpwm_of_match);
 static int ehrpwm_pwm_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
+	struct pwm_chip *chip;
 	struct ehrpwm_pwm_chip *pc;
 	struct clk *clk;
 	int ret;
 
-	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
-	if (!pc)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, NUM_PWM_CHANNEL, sizeof(*pc));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	pc = to_ehrpwm_pwm_chip(chip);
 
 	clk = devm_clk_get(&pdev->dev, "fck");
 	if (IS_ERR(clk)) {
@@ -474,9 +475,7 @@ static int ehrpwm_pwm_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	pc->chip.dev = &pdev->dev;
-	pc->chip.ops = &ehrpwm_pwm_ops;
-	pc->chip.npwm = NUM_PWM_CHANNEL;
+	chip->ops = &ehrpwm_pwm_ops;
 
 	pc->mmio_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(pc->mmio_base))
@@ -493,13 +492,13 @@ static int ehrpwm_pwm_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret = pwmchip_add(&pc->chip);
+	ret = pwmchip_add(chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
 		goto err_clk_unprepare;
 	}
 
-	platform_set_drvdata(pdev, pc);
+	platform_set_drvdata(pdev, chip);
 	pm_runtime_enable(&pdev->dev);
 
 	return 0;
@@ -512,18 +511,21 @@ static int ehrpwm_pwm_probe(struct platform_device *pdev)
 
 static void ehrpwm_pwm_remove(struct platform_device *pdev)
 {
-	struct ehrpwm_pwm_chip *pc = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
 
-	pwmchip_remove(&pc->chip);
+	pwmchip_remove(chip);
 
 	clk_unprepare(pc->tbclk);
 
 	pm_runtime_disable(&pdev->dev);
 }
 
-static void ehrpwm_pwm_save_context(struct ehrpwm_pwm_chip *pc)
+static void ehrpwm_pwm_save_context(struct pwm_chip *chip)
 {
-	pm_runtime_get_sync(pwmchip_parent(&pc->chip));
+	struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
+
+	pm_runtime_get_sync(pwmchip_parent(chip));
 
 	pc->ctx.tbctl = ehrpwm_read(pc->mmio_base, TBCTL);
 	pc->ctx.tbprd = ehrpwm_read(pc->mmio_base, TBPRD);
@@ -534,11 +536,13 @@ static void ehrpwm_pwm_save_context(struct ehrpwm_pwm_chip *pc)
 	pc->ctx.aqsfrc = ehrpwm_read(pc->mmio_base, AQSFRC);
 	pc->ctx.aqcsfrc = ehrpwm_read(pc->mmio_base, AQCSFRC);
 
-	pm_runtime_put_sync(pwmchip_parent(&pc->chip));
+	pm_runtime_put_sync(pwmchip_parent(chip));
 }
 
-static void ehrpwm_pwm_restore_context(struct ehrpwm_pwm_chip *pc)
+static void ehrpwm_pwm_restore_context(struct pwm_chip *chip)
 {
+	struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
+
 	ehrpwm_write(pc->mmio_base, TBPRD, pc->ctx.tbprd);
 	ehrpwm_write(pc->mmio_base, CMPA, pc->ctx.cmpa);
 	ehrpwm_write(pc->mmio_base, CMPB, pc->ctx.cmpb);
@@ -551,13 +555,13 @@ static void ehrpwm_pwm_restore_context(struct ehrpwm_pwm_chip *pc)
 
 static int ehrpwm_pwm_suspend(struct device *dev)
 {
-	struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
+	struct pwm_chip *chip = dev_get_drvdata(dev);
 	unsigned int i;
 
-	ehrpwm_pwm_save_context(pc);
+	ehrpwm_pwm_save_context(chip);
 
-	for (i = 0; i < pc->chip.npwm; i++) {
-		struct pwm_device *pwm = &pc->chip.pwms[i];
+	for (i = 0; i < chip->npwm; i++) {
+		struct pwm_device *pwm = &chip->pwms[i];
 
 		if (!pwm_is_enabled(pwm))
 			continue;
@@ -571,11 +575,11 @@ static int ehrpwm_pwm_suspend(struct device *dev)
 
 static int ehrpwm_pwm_resume(struct device *dev)
 {
-	struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
+	struct pwm_chip *chip = dev_get_drvdata(dev);
 	unsigned int i;
 
-	for (i = 0; i < pc->chip.npwm; i++) {
-		struct pwm_device *pwm = &pc->chip.pwms[i];
+	for (i = 0; i < chip->npwm; i++) {
+		struct pwm_device *pwm = &chip->pwms[i];
 
 		if (!pwm_is_enabled(pwm))
 			continue;
@@ -584,7 +588,7 @@ static int ehrpwm_pwm_resume(struct device *dev)
 		pm_runtime_get_sync(dev);
 	}
 
-	ehrpwm_pwm_restore_context(pc);
+	ehrpwm_pwm_restore_context(chip);
 
 	return 0;
 }
-- 
2.42.0

[PATCH v4 101/115] pwm: twl-led: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-twl-led driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-twl-led.c | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/pwm/pwm-twl-led.c b/drivers/pwm/pwm-twl-led.c
index 51a2f34b0e0c..6f1b36d2ff70 100644
--- a/drivers/pwm/pwm-twl-led.c
+++ b/drivers/pwm/pwm-twl-led.c
@@ -62,13 +62,12 @@
 #define TWL6040_LED_MODE_MASK	0x03
 
 struct twl_pwmled_chip {
-	struct pwm_chip chip;
 	struct mutex mutex;
 };
 
 static inline struct twl_pwmled_chip *to_twl(struct pwm_chip *chip)
 {
-	return container_of(chip, struct twl_pwmled_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int twl4030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -345,25 +344,28 @@ static const struct pwm_ops twl6030_pwmled_ops = {
 
 static int twl_pwmled_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct twl_pwmled_chip *twl;
+	unsigned int npwm;
 
-	twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL);
-	if (!twl)
-		return -ENOMEM;
+	if (twl_class_is_4030())
+		npwm = 2;
+	else
+		npwm = 1;
 
-	if (twl_class_is_4030()) {
-		twl->chip.ops = &twl4030_pwmled_ops;
-		twl->chip.npwm = 2;
-	} else {
-		twl->chip.ops = &twl6030_pwmled_ops;
-		twl->chip.npwm = 1;
-	}
+	chip = devm_pwmchip_alloc(&pdev->dev, npwm, sizeof(*twl));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	twl = to_twl(chip);
 
-	twl->chip.dev = &pdev->dev;
+	if (twl_class_is_4030())
+		chip->ops = &twl4030_pwmled_ops;
+	else
+		chip->ops = &twl6030_pwmled_ops;
 
 	mutex_init(&twl->mutex);
 
-	return devm_pwmchip_add(&pdev->dev, &twl->chip);
+	return devm_pwmchip_add(&pdev->dev, chip);
 }
 
 #ifdef CONFIG_OF
-- 
2.42.0

[PATCH v4 102/115] pwm: twl: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-twol driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-twl.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/pwm/pwm-twl.c b/drivers/pwm/pwm-twl.c
index 7233ae039bdb..8f981ffff4b4 100644
--- a/drivers/pwm/pwm-twl.c
+++ b/drivers/pwm/pwm-twl.c
@@ -46,7 +46,6 @@
 #define TWL6030_PWM_TOGGLE(pwm, x)	((x) << (pwm * 3))
 
 struct twl_pwm_chip {
-	struct pwm_chip chip;
 	struct mutex mutex;
 	u8 twl6030_toggle3;
 	u8 twl4030_pwm_mux;
@@ -54,7 +53,7 @@ struct twl_pwm_chip {
 
 static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip)
 {
-	return container_of(chip, struct twl_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -341,23 +340,22 @@ static const struct pwm_ops twl6030_pwm_ops = {
 
 static int twl_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct twl_pwm_chip *twl;
 
-	twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL);
-	if (!twl)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(&pdev->dev, 2, sizeof(*twl));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	twl = to_twl(chip);
 
 	if (twl_class_is_4030())
-		twl->chip.ops = &twl4030_pwm_ops;
+		chip->ops = &twl4030_pwm_ops;
 	else
-		twl->chip.ops = &twl6030_pwm_ops;
-
-	twl->chip.dev = &pdev->dev;
-	twl->chip.npwm = 2;
+		chip->ops = &twl6030_pwm_ops;
 
 	mutex_init(&twl->mutex);
 
-	return devm_pwmchip_add(&pdev->dev, &twl->chip);
+	return devm_pwmchip_add(&pdev->dev, chip);
 }
 
 #ifdef CONFIG_OF
-- 
2.42.0

[PATCH v4 103/115] pwm: visconti: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-visconti driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-visconti.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pwm/pwm-visconti.c b/drivers/pwm/pwm-visconti.c
index 8d736d558122..9e55380957be 100644
--- a/drivers/pwm/pwm-visconti.c
+++ b/drivers/pwm/pwm-visconti.c
@@ -34,13 +34,12 @@
 #define PIPGM_PWMC_POLARITY_MASK	GENMASK(5, 5)
 
 struct visconti_pwm_chip {
-	struct pwm_chip chip;
 	void __iomem *base;
 };
 
 static inline struct visconti_pwm_chip *visconti_pwm_from_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct visconti_pwm_chip, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int visconti_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -134,22 +133,22 @@ static const struct pwm_ops visconti_pwm_ops = {
 static int visconti_pwm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct pwm_chip *chip;
 	struct visconti_pwm_chip *priv;
 	int ret;
 
-	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(dev, 4, sizeof(*priv));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	priv = visconti_pwm_from_chip(chip);
 
 	priv->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
 
-	priv->chip.dev = dev;
-	priv->chip.ops = &visconti_pwm_ops;
-	priv->chip.npwm = 4;
+	chip->ops = &visconti_pwm_ops;
 
-	ret = devm_pwmchip_add(&pdev->dev, &priv->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0)
 		return dev_err_probe(&pdev->dev, ret, "Cannot register visconti PWM\n");
 
-- 
2.42.0

[PATCH v4 104/115] pwm: vt8500: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-vt8500 driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-vt8500.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/pwm/pwm-vt8500.c b/drivers/pwm/pwm-vt8500.c
index ff5e76afbddf..b24afee37488 100644
--- a/drivers/pwm/pwm-vt8500.c
+++ b/drivers/pwm/pwm-vt8500.c
@@ -45,12 +45,14 @@
 #define STATUS_ALL_UPDATE	0x0F
 
 struct vt8500_chip {
-	struct pwm_chip chip;
 	void __iomem *base;
 	struct clk *clk;
 };
 
-#define to_vt8500_chip(chip)	container_of(chip, struct vt8500_chip, chip)
+static inline struct vt8500_chip *to_vt8500_chip(struct pwm_chip *chip)
+{
+	return pwmchip_get_drvdata(chip);
+}
 
 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
 static inline void vt8500_pwm_busy_wait(struct pwm_chip *chip, int nr, u8 bitmask)
@@ -232,6 +234,7 @@ MODULE_DEVICE_TABLE(of, vt8500_pwm_dt_ids);
 
 static int vt8500_pwm_probe(struct platform_device *pdev)
 {
+	struct pwm_chip *chip;
 	struct vt8500_chip *vt8500;
 	struct device_node *np = pdev->dev.of_node;
 	int ret;
@@ -239,13 +242,12 @@ static int vt8500_pwm_probe(struct platform_device *pdev)
 	if (!np)
 		return dev_err_probe(&pdev->dev, -EINVAL, "invalid devicetree node\n");
 
-	vt8500 = devm_kzalloc(&pdev->dev, sizeof(*vt8500), GFP_KERNEL);
-	if (vt8500 == NULL)
+	chip = devm_pwmchip_alloc(&pdev->dev, VT8500_NR_PWMS, sizeof(*vt8500));
+	if (chip == NULL)
 		return -ENOMEM;
+	vt8500 = to_vt8500_chip(chip);
 
-	vt8500->chip.dev = &pdev->dev;
-	vt8500->chip.ops = &vt8500_pwm_ops;
-	vt8500->chip.npwm = VT8500_NR_PWMS;
+	chip->ops = &vt8500_pwm_ops;
 
 	vt8500->clk = devm_clk_get_prepared(&pdev->dev, NULL);
 	if (IS_ERR(vt8500->clk))
@@ -255,7 +257,7 @@ static int vt8500_pwm_probe(struct platform_device *pdev)
 	if (IS_ERR(vt8500->base))
 		return PTR_ERR(vt8500->base);
 
-	ret = devm_pwmchip_add(&pdev->dev, &vt8500->chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret < 0)
 		return dev_err_probe(&pdev->dev, ret, "failed to add PWM chip\n");
 
-- 
2.42.0

[PATCH v4 105/115] pwm: xilinx: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm-xilinx driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-xilinx.c | 34 ++++++++++++++--------------------
 1 file changed, 14 insertions(+), 20 deletions(-)

diff --git a/drivers/pwm/pwm-xilinx.c b/drivers/pwm/pwm-xilinx.c
index 5f3c2a6fed11..465ac9617256 100644
--- a/drivers/pwm/pwm-xilinx.c
+++ b/drivers/pwm/pwm-xilinx.c
@@ -80,15 +80,10 @@ unsigned int xilinx_timer_get_period(struct xilinx_timer_priv *priv,
 #define TCSR_PWM_CLEAR (TCSR_MDT | TCSR_LOAD)
 #define TCSR_PWM_MASK (TCSR_PWM_SET | TCSR_PWM_CLEAR)
 
-struct xilinx_pwm_device {
-	struct pwm_chip chip;
-	struct xilinx_timer_priv priv;
-};
-
 static inline struct xilinx_timer_priv
 *xilinx_pwm_chip_to_priv(struct pwm_chip *chip)
 {
-	return &container_of(chip, struct xilinx_pwm_device, chip)->priv;
+	return pwmchip_get_drvdata(chip);
 }
 
 static bool xilinx_timer_pwm_enabled(u32 tcsr0, u32 tcsr1)
@@ -213,8 +208,8 @@ static int xilinx_pwm_probe(struct platform_device *pdev)
 	int ret;
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
+	struct pwm_chip *chip;
 	struct xilinx_timer_priv *priv;
-	struct xilinx_pwm_device *xilinx_pwm;
 	u32 pwm_cells, one_timer, width;
 	void __iomem *regs;
 
@@ -225,11 +220,11 @@ static int xilinx_pwm_probe(struct platform_device *pdev)
 	if (ret)
 		return dev_err_probe(dev, ret, "could not read #pwm-cells\n");
 
-	xilinx_pwm = devm_kzalloc(dev, sizeof(*xilinx_pwm), GFP_KERNEL);
-	if (!xilinx_pwm)
-		return -ENOMEM;
-	platform_set_drvdata(pdev, xilinx_pwm);
-	priv = &xilinx_pwm->priv;
+	chip = devm_pwmchip_alloc(dev, 1, sizeof(*priv));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	priv = xilinx_pwm_chip_to_priv(chip);
+	platform_set_drvdata(pdev, chip);
 
 	regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(regs))
@@ -278,10 +273,8 @@ static int xilinx_pwm_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, ret, "Clock enable failed\n");
 	clk_rate_exclusive_get(priv->clk);
 
-	xilinx_pwm->chip.dev = dev;
-	xilinx_pwm->chip.ops = &xilinx_pwm_ops;
-	xilinx_pwm->chip.npwm = 1;
-	ret = pwmchip_add(&xilinx_pwm->chip);
+	chip->ops = &xilinx_pwm_ops;
+	ret = pwmchip_add(chip);
 	if (ret) {
 		clk_rate_exclusive_put(priv->clk);
 		clk_disable_unprepare(priv->clk);
@@ -293,11 +286,12 @@ static int xilinx_pwm_probe(struct platform_device *pdev)
 
 static void xilinx_pwm_remove(struct platform_device *pdev)
 {
-	struct xilinx_pwm_device *xilinx_pwm = platform_get_drvdata(pdev);
+	struct pwm_chip *chip = platform_get_drvdata(pdev);
+	struct xilinx_timer_priv *priv = xilinx_pwm_chip_to_priv(chip);
 
-	pwmchip_remove(&xilinx_pwm->chip);
-	clk_rate_exclusive_put(xilinx_pwm->priv.clk);
-	clk_disable_unprepare(xilinx_pwm->priv.clk);
+	pwmchip_remove(chip);
+	clk_rate_exclusive_put(priv->clk);
+	clk_disable_unprepare(priv->clk);
 }
 
 static const struct of_device_id xilinx_pwm_of_match[] = {
-- 
2.42.0

[PATCH v4 106/115] gpio: mvebu: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm sub-driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/gpio/gpio-mvebu.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
index a13f3c18ccd4..8cfd3a89c018 100644
--- a/drivers/gpio/gpio-mvebu.c
+++ b/drivers/gpio/gpio-mvebu.c
@@ -99,7 +99,6 @@ struct mvebu_pwm {
 	u32			 offset;
 	unsigned long		 clk_rate;
 	struct gpio_desc	*gpiod;
-	struct pwm_chip		 chip;
 	spinlock_t		 lock;
 	struct mvebu_gpio_chip	*mvchip;
 
@@ -615,7 +614,7 @@ static const struct regmap_config mvebu_gpio_regmap_config = {
  */
 static struct mvebu_pwm *to_mvebu_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct mvebu_pwm, chip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int mvebu_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -789,6 +788,7 @@ static int mvebu_pwm_probe(struct platform_device *pdev,
 {
 	struct device *dev = &pdev->dev;
 	struct mvebu_pwm *mvpwm;
+	struct pwm_chip *chip;
 	void __iomem *base;
 	u32 offset;
 	u32 set;
@@ -813,9 +813,11 @@ static int mvebu_pwm_probe(struct platform_device *pdev,
 	if (IS_ERR(mvchip->clk))
 		return PTR_ERR(mvchip->clk);
 
-	mvpwm = devm_kzalloc(dev, sizeof(struct mvebu_pwm), GFP_KERNEL);
-	if (!mvpwm)
-		return -ENOMEM;
+	chip = devm_pwmchip_alloc(dev, mvchip->chip.ngpio, sizeof(*mvpwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	mvpwm = to_mvebu_pwm(chip);
+
 	mvchip->mvpwm = mvpwm;
 	mvpwm->mvchip = mvchip;
 	mvpwm->offset = offset;
@@ -868,13 +870,11 @@ static int mvebu_pwm_probe(struct platform_device *pdev,
 		return -EINVAL;
 	}
 
-	mvpwm->chip.dev = dev;
-	mvpwm->chip.ops = &mvebu_pwm_ops;
-	mvpwm->chip.npwm = mvchip->chip.ngpio;
+	chip->ops = &mvebu_pwm_ops;
 
 	spin_lock_init(&mvpwm->lock);
 
-	return devm_pwmchip_add(dev, &mvpwm->chip);
+	return devm_pwmchip_add(dev, chip);
 }
 
 #ifdef CONFIG_DEBUG_FS
-- 
2.42.0

[PATCH v4 107/115] drm/bridge: ti-sn65dsi86: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm driver of the ti-sn65dsi86 to further changes of
the pwm core outlined in the commit introducing devm_pwmchip_alloc().
There is no intended semantical change and the driver should behave as
before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index c45c07840f64..33eb2ed0a729 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -197,7 +197,7 @@ struct ti_sn65dsi86 {
 	DECLARE_BITMAP(gchip_output, SN_NUM_GPIOS);
 #endif
 #if defined(CONFIG_PWM)
-	struct pwm_chip			pchip;
+	struct pwm_chip			*pchip;
 	bool				pwm_enabled;
 	atomic_t			pwm_pin_busy;
 #endif
@@ -1372,7 +1372,7 @@ static void ti_sn_pwm_pin_release(struct ti_sn65dsi86 *pdata)
 
 static struct ti_sn65dsi86 *pwm_chip_to_ti_sn_bridge(struct pwm_chip *chip)
 {
-	return container_of(chip, struct ti_sn65dsi86, pchip);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int ti_sn_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -1585,22 +1585,31 @@ static const struct pwm_ops ti_sn_pwm_ops = {
 static int ti_sn_pwm_probe(struct auxiliary_device *adev,
 			   const struct auxiliary_device_id *id)
 {
+	struct pwm_chip *chip;
 	struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent);
 
-	pdata->pchip.dev = pdata->dev;
-	pdata->pchip.ops = &ti_sn_pwm_ops;
-	pdata->pchip.npwm = 1;
-	pdata->pchip.of_xlate = of_pwm_single_xlate;
-	pdata->pchip.of_pwm_n_cells = 1;
+	/*
+	 * This should better use adev->dev instead of pdata->dev. See
+	 * https://lore.kernel.org/dri-devel/20231127101547.734061-2-u.kleine-koenig@pengutronix.de
+	 */
+	pdata->pchip = chip = devm_pwmchip_alloc(pdata->dev, 1, 0);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
 
-	return pwmchip_add(&pdata->pchip);
+	pwmchip_set_drvdata(chip, pdata);
+
+	chip->ops = &ti_sn_pwm_ops;
+	chip->of_xlate = of_pwm_single_xlate;
+	chip->of_pwm_n_cells = 1;
+
+	return pwmchip_add(chip);
 }
 
 static void ti_sn_pwm_remove(struct auxiliary_device *adev)
 {
 	struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent);
 
-	pwmchip_remove(&pdata->pchip);
+	pwmchip_remove(pdata->pchip);
 
 	if (pdata->pwm_enabled)
 		pm_runtime_put_sync(pdata->dev);
-- 
2.42.0

[PATCH v4 108/115] leds: qcom-lpg: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

This prepares the pwm sub-driver to further changes of the pwm core
outlined in the commit introducing devm_pwmchip_alloc(). There is no
intended semantical change and the driver should behave as before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/leds/rgb/leds-qcom-lpg.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/leds/rgb/leds-qcom-lpg.c b/drivers/leds/rgb/leds-qcom-lpg.c
index 156b73d1f4a2..0a7acf59a420 100644
--- a/drivers/leds/rgb/leds-qcom-lpg.c
+++ b/drivers/leds/rgb/leds-qcom-lpg.c
@@ -77,7 +77,7 @@ struct lpg {
 
 	struct mutex lock;
 
-	struct pwm_chip pwm;
+	struct pwm_chip *pwm;
 
 	const struct lpg_data *data;
 
@@ -978,7 +978,7 @@ static int lpg_pattern_mc_clear(struct led_classdev *cdev)
 
 static inline struct lpg *lpg_pwm_from_chip(struct pwm_chip *chip)
 {
-	return container_of(chip, struct lpg, pwm);
+	return pwmchip_get_drvdata(chip);
 }
 
 static int lpg_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -1093,13 +1093,17 @@ static const struct pwm_ops lpg_pwm_ops = {
 
 static int lpg_add_pwm(struct lpg *lpg)
 {
+	struct pwm_chip *chip;
 	int ret;
 
-	lpg->pwm.dev = lpg->dev;
-	lpg->pwm.npwm = lpg->num_channels;
-	lpg->pwm.ops = &lpg_pwm_ops;
+	lpg->pwm = chip = devm_pwmchip_alloc(lpg->dev, lpg->num_channels, 0);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
 
-	ret = devm_pwmchip_add(lpg->dev, &lpg->pwm);
+	chip->ops = &lpg_pwm_ops;
+	pwmchip_set_drvdata(chip, lpg);
+
+	ret = devm_pwmchip_add(lpg->dev, chip);
 	if (ret)
 		dev_err_probe(lpg->dev, ret, "failed to add PWM chip\n");
 
-- 
2.42.0

[PATCH v4 110/115] pwm: Ensure that pwm_chips are allocated using pwmchip_alloc()

[Uwe Kleine-König]

Memory holding a struct device must not be freed before the reference
count drops to zero. So a struct pwm_chip must not live in memory
freed by a driver on unbind. All in-tree drivers were fixed accordingly,
but as out-of-tree drivers, that were not adapted, still compile fine,
catch these in pwmchip_add().

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/core.c  | 10 ++++++++++
 include/linux/pwm.h |  1 +
 2 files changed, 11 insertions(+)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index fda72963016b..ce6f4b397468 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -216,6 +216,7 @@ struct pwm_chip *devm_pwmchip_alloc(struct device *parent, unsigned int npwm, si
 
 	chip->dev = parent;
 	chip->npwm = npwm;
+	chip->uses_pwmchip_alloc = true;
 
 	pwmchip_set_drvdata(chip, pwmchip_priv(chip));
 
@@ -241,6 +242,15 @@ int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
 	if (!chip || !chip->dev || !chip->ops || !chip->npwm)
 		return -EINVAL;
 
+	/*
+	 * a struct pwm_chip must be allocated using (devm_)pwmchip_alloc,
+	 * otherwise the embedded struct device might disappear too early
+	 * resulting in memory corruption.
+	 * Catch drivers that were not converted appropriately.
+	 */
+	if (!chip->uses_pwmchip_alloc)
+		return -EINVAL;
+
 	if (!pwm_ops_check(chip))
 		return -EINVAL;
 
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index b410ff38beb5..6a5b245e8951 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -300,6 +300,7 @@ struct pwm_chip {
 	unsigned int of_pwm_n_cells;
 
 	/* only used internally by the PWM framework */
+	bool uses_pwmchip_alloc;
 	struct pwm_device *pwms;
 	void *driver_data;
 };
-- 
2.42.0

[PATCH v4 111/115] pwm: Ensure a struct pwm has the same lifetime as its pwm_chip

[Uwe Kleine-König]

It's required to not free the memory underlying a requested PWM
while a consumer still has a reference to it. While currently a pwm_chip
doesn't life long enough in all cases, linking the struct pwm to the
pwm_chip results in the right lifetime as soon as the pwmchip is living
long enough. This happens with the following commits.

Note this is a breaking change for all pwm drivers that don't use
pwmchip_alloc().

Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> # for struct_size() and __counted_by()
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/core.c  | 27 ++++++++++-----------------
 include/linux/pwm.h |  2 +-
 2 files changed, 11 insertions(+), 18 deletions(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index ce6f4b397468..b3ba08aa0b14 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -200,15 +200,16 @@ static bool pwm_ops_check(const struct pwm_chip *chip)
 
 static void *pwmchip_priv(struct pwm_chip *chip)
 {
-	return (void *)chip + sizeof(*chip);
+	return (void *)chip + struct_size(chip, pwms, chip->npwm);
 }
 
 struct pwm_chip *devm_pwmchip_alloc(struct device *parent, unsigned int npwm, size_t sizeof_priv)
 {
 	struct pwm_chip *chip;
 	size_t alloc_size;
+	unsigned int i;
 
-	alloc_size = size_add(sizeof(*chip), sizeof_priv);
+	alloc_size = size_add(struct_size(chip, pwms, npwm), sizeof_priv);
 
 	chip = devm_kzalloc(parent, alloc_size, GFP_KERNEL);
 	if (!chip)
@@ -220,6 +221,13 @@ struct pwm_chip *devm_pwmchip_alloc(struct device *parent, unsigned int npwm, si
 
 	pwmchip_set_drvdata(chip, pwmchip_priv(chip));
 
+	for (i = 0; i < chip->npwm; i++) {
+		struct pwm_device *pwm = &chip->pwms[i];
+
+		pwm->chip = chip;
+		pwm->hwpwm = i;
+	}
+
 	return chip;
 }
 EXPORT_SYMBOL_GPL(devm_pwmchip_alloc);
@@ -236,7 +244,6 @@ EXPORT_SYMBOL_GPL(devm_pwmchip_alloc);
  */
 int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
 {
-	unsigned int i;
 	int ret;
 
 	if (!chip || !chip->dev || !chip->ops || !chip->npwm)
@@ -256,28 +263,16 @@ int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
 
 	chip->owner = owner;
 
-	chip->pwms = kcalloc(chip->npwm, sizeof(*chip->pwms), GFP_KERNEL);
-	if (!chip->pwms)
-		return -ENOMEM;
-
 	mutex_lock(&pwm_lock);
 
 	ret = idr_alloc(&pwmchip_idr, chip, 0, 0, GFP_KERNEL);
 	if (ret < 0) {
 		mutex_unlock(&pwm_lock);
-		kfree(chip->pwms);
 		return ret;
 	}
 
 	chip->id = ret;
 
-	for (i = 0; i < chip->npwm; i++) {
-		struct pwm_device *pwm = &chip->pwms[i];
-
-		pwm->chip = chip;
-		pwm->hwpwm = i;
-	}
-
 	mutex_unlock(&pwm_lock);
 
 	if (IS_ENABLED(CONFIG_OF))
@@ -307,8 +302,6 @@ void pwmchip_remove(struct pwm_chip *chip)
 	idr_remove(&pwmchip_idr, chip->id);
 
 	mutex_unlock(&pwm_lock);
-
-	kfree(chip->pwms);
 }
 EXPORT_SYMBOL_GPL(pwmchip_remove);
 
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 6a5b245e8951..eb91306ba28e 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -301,8 +301,8 @@ struct pwm_chip {
 
 	/* only used internally by the PWM framework */
 	bool uses_pwmchip_alloc;
-	struct pwm_device *pwms;
 	void *driver_data;
+	struct pwm_device pwms[] __counted_by(npwm);
 };
 
 static inline struct device *pwmchip_parent(struct pwm_chip *chip)
-- 
2.42.0

[PATCH v4 112/115] pwm: Ensure the memory backing a PWM chip isn't freed while used

[Uwe Kleine-König]

The memory allocated to hold a struct pwm_chip is tied now to the struct
device that is added to struct pwm_chip. This way it's only freed when
the last reference is dropped.

Currently this isn't required yet as device links make sure that a
consumer is gone before the PWM chip goes away. However there are plans
to introduce character device support for PWM chips and with that in
place it can happen that a reference to a pwm_chip is held with its
driver going away.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/Kconfig  |   4 --
 drivers/pwm/Makefile |   3 +-
 drivers/pwm/core.c   | 127 +++++++++++++++++++++++++++++++------------
 drivers/pwm/sysfs.c  |  45 +++------------
 include/linux/pwm.h  |  17 ++----
 5 files changed, 105 insertions(+), 91 deletions(-)

diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 4b956d661755..1dd7921194f5 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -29,10 +29,6 @@ menuconfig PWM
 
 if PWM
 
-config PWM_SYSFS
-	bool
-	default y if SYSFS
-
 config PWM_DEBUG
 	bool "PWM lowlevel drivers additional checks and debug messages"
 	depends on DEBUG_KERNEL
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index c5ec9e168ee7..2aaaf92a7035 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -1,6 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_PWM)		+= core.o
-obj-$(CONFIG_PWM_SYSFS)		+= sysfs.o
+obj-$(CONFIG_PWM)		+= core.o sysfs.o
 obj-$(CONFIG_PWM_AB8500)	+= pwm-ab8500.o
 obj-$(CONFIG_PWM_APPLE)		+= pwm-apple.o
 obj-$(CONFIG_PWM_ATMEL)		+= pwm-atmel.o
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index b3ba08aa0b14..4805ccff5970 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -43,7 +43,7 @@ static struct pwm_chip *pwmchip_find_by_name(const char *name)
 	mutex_lock(&pwm_lock);
 
 	idr_for_each_entry_ul(&pwmchip_idr, chip, tmp, id) {
-		const char *chip_name = dev_name(chip->dev);
+		const char *chip_name = dev_name(chip->dev.parent);
 
 		if (chip_name && strcmp(chip_name, name) == 0) {
 			mutex_unlock(&pwm_lock);
@@ -65,13 +65,13 @@ static int pwm_device_request(struct pwm_device *pwm, const char *label)
 	if (test_bit(PWMF_REQUESTED, &pwm->flags))
 		return -EBUSY;
 
-	if (!try_module_get(chip->owner))
+	if (!get_device(&chip->dev))
 		return -ENODEV;
 
 	if (ops->request) {
 		err = ops->request(chip, pwm);
 		if (err) {
-			module_put(chip->owner);
+			put_device(&chip->dev);
 			return err;
 		}
 	}
@@ -161,13 +161,13 @@ EXPORT_SYMBOL_GPL(of_pwm_single_xlate);
 
 static void of_pwmchip_add(struct pwm_chip *chip)
 {
-	if (!chip->dev || !chip->dev->of_node)
+	if (!chip->dev.parent || !chip->dev.parent->of_node)
 		return;
 
 	if (!chip->of_xlate) {
 		u32 pwm_cells;
 
-		if (of_property_read_u32(chip->dev->of_node, "#pwm-cells",
+		if (of_property_read_u32(chip->dev.parent->of_node, "#pwm-cells",
 					 &pwm_cells))
 			pwm_cells = 2;
 
@@ -175,13 +175,13 @@ static void of_pwmchip_add(struct pwm_chip *chip)
 		chip->of_pwm_n_cells = pwm_cells;
 	}
 
-	of_node_get(chip->dev->of_node);
+	of_node_get(chip->dev.parent->of_node);
 }
 
 static void of_pwmchip_remove(struct pwm_chip *chip)
 {
-	if (chip->dev)
-		of_node_put(chip->dev->of_node);
+	if (chip->dev.parent)
+		of_node_put(chip->dev.parent->of_node);
 }
 
 static bool pwm_ops_check(const struct pwm_chip *chip)
@@ -192,7 +192,7 @@ static bool pwm_ops_check(const struct pwm_chip *chip)
 		return false;
 
 	if (IS_ENABLED(CONFIG_PWM_DEBUG) && !ops->get_state)
-		dev_warn(chip->dev,
+		dev_warn(chip->dev.parent,
 			 "Please implement the .get_state() callback\n");
 
 	return true;
@@ -203,19 +203,33 @@ static void *pwmchip_priv(struct pwm_chip *chip)
 	return (void *)chip + struct_size(chip, pwms, chip->npwm);
 }
 
-struct pwm_chip *devm_pwmchip_alloc(struct device *parent, unsigned int npwm, size_t sizeof_priv)
+static void pwmchip_release(struct device *dev)
+{
+	struct pwm_chip *chip = container_of(dev, struct pwm_chip, dev);
+
+	kfree(chip);
+}
+
+static struct pwm_chip *pwmchip_alloc(struct device *parent, unsigned int npwm, size_t sizeof_priv)
 {
 	struct pwm_chip *chip;
+	struct device *dev;
 	size_t alloc_size;
 	unsigned int i;
 
 	alloc_size = size_add(struct_size(chip, pwms, npwm), sizeof_priv);
 
-	chip = devm_kzalloc(parent, alloc_size, GFP_KERNEL);
+	chip = kzalloc(alloc_size, GFP_KERNEL);
 	if (!chip)
 		return ERR_PTR(-ENOMEM);
 
-	chip->dev = parent;
+	dev = &chip->dev;
+
+	device_initialize(dev);
+	dev->class = &pwm_class;
+	dev->parent = parent;
+	dev->release = pwmchip_release;
+
 	chip->npwm = npwm;
 	chip->uses_pwmchip_alloc = true;
 
@@ -230,6 +244,29 @@ struct pwm_chip *devm_pwmchip_alloc(struct device *parent, unsigned int npwm, si
 
 	return chip;
 }
+
+static void devm_pwmchip_put(void *_chip)
+{
+	struct pwm_chip *chip = _chip;
+
+	put_device(&chip->dev);
+}
+
+struct pwm_chip *devm_pwmchip_alloc(struct device *parent, unsigned int npwm, size_t sizeof_priv)
+{
+	struct pwm_chip *chip;
+	int ret;
+
+	chip = pwmchip_alloc(parent, npwm, sizeof_priv);
+	if (IS_ERR(chip))
+		return chip;
+
+	ret = devm_add_action_or_reset(parent, devm_pwmchip_put, chip);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return chip;
+}
 EXPORT_SYMBOL_GPL(devm_pwmchip_alloc);
 
 /**
@@ -246,7 +283,7 @@ int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
 {
 	int ret;
 
-	if (!chip || !chip->dev || !chip->ops || !chip->npwm)
+	if (!chip || !chip->dev.parent || !chip->ops || !chip->npwm)
 		return -EINVAL;
 
 	/*
@@ -262,25 +299,41 @@ int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
 		return -EINVAL;
 
 	chip->owner = owner;
+	if (!try_module_get(owner))
+		return -EINVAL;
 
 	mutex_lock(&pwm_lock);
 
 	ret = idr_alloc(&pwmchip_idr, chip, 0, 0, GFP_KERNEL);
-	if (ret < 0) {
-		mutex_unlock(&pwm_lock);
-		return ret;
-	}
+	if (ret < 0)
+		goto err_idr_alloc;
 
 	chip->id = ret;
-
-	mutex_unlock(&pwm_lock);
+	dev_set_name(&chip->dev, "pwmchip%u", chip->id);
 
 	if (IS_ENABLED(CONFIG_OF))
 		of_pwmchip_add(chip);
 
-	pwmchip_sysfs_export(chip);
+	ret = device_add(&chip->dev);
+	if (ret)
+		goto err_device_add;
+
+	mutex_unlock(&pwm_lock);
 
 	return 0;
+
+err_device_add:
+
+	if (IS_ENABLED(CONFIG_OF))
+		of_pwmchip_remove(chip);
+
+	idr_remove(&pwmchip_idr, chip->id);
+err_idr_alloc:
+
+	mutex_unlock(&pwm_lock);
+	module_put(owner);
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(__pwmchip_add);
 
@@ -302,6 +355,10 @@ void pwmchip_remove(struct pwm_chip *chip)
 	idr_remove(&pwmchip_idr, chip->id);
 
 	mutex_unlock(&pwm_lock);
+
+	module_put(chip->owner);
+
+	device_del(&chip->dev);
 }
 EXPORT_SYMBOL_GPL(pwmchip_remove);
 
@@ -398,18 +455,18 @@ static void pwm_apply_state_debug(struct pwm_device *pwm,
 
 	if (s2.polarity != state->polarity &&
 	    state->duty_cycle < state->period)
-		dev_warn(chip->dev, ".apply ignored .polarity\n");
+		dev_warn(chip->dev.parent, ".apply ignored .polarity\n");
 
 	if (state->enabled &&
 	    last->polarity == state->polarity &&
 	    last->period > s2.period &&
 	    last->period <= state->period)
-		dev_warn(chip->dev,
+		dev_warn(chip->dev.parent,
 			 ".apply didn't pick the best available period (requested: %llu, applied: %llu, possible: %llu)\n",
 			 state->period, s2.period, last->period);
 
 	if (state->enabled && state->period < s2.period)
-		dev_warn(chip->dev,
+		dev_warn(chip->dev.parent,
 			 ".apply is supposed to round down period (requested: %llu, applied: %llu)\n",
 			 state->period, s2.period);
 
@@ -418,20 +475,20 @@ static void pwm_apply_state_debug(struct pwm_device *pwm,
 	    last->period == s2.period &&
 	    last->duty_cycle > s2.duty_cycle &&
 	    last->duty_cycle <= state->duty_cycle)
-		dev_warn(chip->dev,
+		dev_warn(chip->dev.parent,
 			 ".apply didn't pick the best available duty cycle (requested: %llu/%llu, applied: %llu/%llu, possible: %llu/%llu)\n",
 			 state->duty_cycle, state->period,
 			 s2.duty_cycle, s2.period,
 			 last->duty_cycle, last->period);
 
 	if (state->enabled && state->duty_cycle < s2.duty_cycle)
-		dev_warn(chip->dev,
+		dev_warn(chip->dev.parent,
 			 ".apply is supposed to round down duty_cycle (requested: %llu/%llu, applied: %llu/%llu)\n",
 			 state->duty_cycle, state->period,
 			 s2.duty_cycle, s2.period);
 
 	if (!state->enabled && s2.enabled && s2.duty_cycle > 0)
-		dev_warn(chip->dev,
+		dev_warn(chip->dev.parent,
 			 "requested disabled, but yielded enabled with duty > 0\n");
 
 	/* reapply the state that the driver reported being configured. */
@@ -439,7 +496,7 @@ static void pwm_apply_state_debug(struct pwm_device *pwm,
 	trace_pwm_apply(pwm, &s1, err);
 	if (err) {
 		*last = s1;
-		dev_err(chip->dev, "failed to reapply current setting\n");
+		dev_err(&chip->dev, "failed to reapply current setting\n");
 		return;
 	}
 
@@ -454,7 +511,7 @@ static void pwm_apply_state_debug(struct pwm_device *pwm,
 	    s1.polarity != last->polarity ||
 	    (s1.enabled && s1.period != last->period) ||
 	    (s1.enabled && s1.duty_cycle != last->duty_cycle)) {
-		dev_err(chip->dev,
+		dev_err(&chip->dev,
 			".apply is not idempotent (ena=%d pol=%d %llu/%llu) -> (ena=%d pol=%d %llu/%llu)\n",
 			s1.enabled, s1.polarity, s1.duty_cycle, s1.period,
 			last->enabled, last->polarity, last->duty_cycle,
@@ -602,7 +659,7 @@ static struct pwm_chip *fwnode_to_pwmchip(struct fwnode_handle *fwnode)
 	mutex_lock(&pwm_lock);
 
 	idr_for_each_entry_ul(&pwmchip_idr, chip, tmp, id)
-		if (chip->dev && device_match_fwnode(chip->dev, fwnode)) {
+		if (device_match_fwnode(chip->dev.parent, fwnode)) {
 			mutex_unlock(&pwm_lock);
 			return chip;
 		}
@@ -623,15 +680,15 @@ static struct device_link *pwm_device_link_add(struct device *dev,
 		 * impact the PM sequence ordering: the PWM supplier may get
 		 * suspended before the consumer.
 		 */
-		dev_warn(pwm->chip->dev,
+		dev_warn(&pwm->chip->dev,
 			 "No consumer device specified to create a link to\n");
 		return NULL;
 	}
 
-	dl = device_link_add(dev, pwm->chip->dev, DL_FLAG_AUTOREMOVE_CONSUMER);
+	dl = device_link_add(dev, pwm->chip->dev.parent, DL_FLAG_AUTOREMOVE_CONSUMER);
 	if (!dl) {
 		dev_err(dev, "failed to create device link to %s\n",
-			dev_name(pwm->chip->dev));
+			dev_name(pwm->chip->dev.parent));
 		return ERR_PTR(-EINVAL);
 	}
 
@@ -953,7 +1010,7 @@ void pwm_put(struct pwm_device *pwm)
 
 	pwm->label = NULL;
 
-	module_put(pwm->chip->owner);
+	put_device(&pwm->chip->dev);
 out:
 	mutex_unlock(&pwm_lock);
 }
@@ -1093,8 +1150,8 @@ static int pwm_seq_show(struct seq_file *s, void *v)
 
 	seq_printf(s, "%s%d: %s/%s, %d PWM device%s\n",
 		   (char *)s->private, chip->id,
-		   chip->dev->bus ? chip->dev->bus->name : "no-bus",
-		   dev_name(chip->dev), chip->npwm,
+		   chip->dev.parent->bus ? chip->dev.parent->bus->name : "no-bus",
+		   dev_name(chip->dev.parent), chip->npwm,
 		   (chip->npwm != 1) ? "s" : "");
 
 	pwm_dbg_show(chip, s);
diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
index 4edb994fa2e1..3a438b29c777 100644
--- a/drivers/pwm/sysfs.c
+++ b/drivers/pwm/sysfs.c
@@ -311,7 +311,7 @@ static ssize_t export_store(struct device *parent,
 			    struct device_attribute *attr,
 			    const char *buf, size_t len)
 {
-	struct pwm_chip *chip = dev_get_drvdata(parent);
+	struct pwm_chip *chip = container_of(parent, struct pwm_chip, dev);
 	struct pwm_device *pwm;
 	unsigned int hwpwm;
 	int ret;
@@ -339,7 +339,7 @@ static ssize_t unexport_store(struct device *parent,
 			      struct device_attribute *attr,
 			      const char *buf, size_t len)
 {
-	struct pwm_chip *chip = dev_get_drvdata(parent);
+	struct pwm_chip *chip = container_of(parent, struct pwm_chip, dev);
 	unsigned int hwpwm;
 	int ret;
 
@@ -359,7 +359,7 @@ static DEVICE_ATTR_WO(unexport);
 static ssize_t npwm_show(struct device *parent, struct device_attribute *attr,
 			 char *buf)
 {
-	const struct pwm_chip *chip = dev_get_drvdata(parent);
+	const struct pwm_chip *chip = container_of(parent, struct pwm_chip, dev);
 
 	return sysfs_emit(buf, "%u\n", chip->npwm);
 }
@@ -411,7 +411,7 @@ static int pwm_class_apply_state(struct pwm_export *export,
 
 static int pwm_class_resume_npwm(struct device *parent, unsigned int npwm)
 {
-	struct pwm_chip *chip = dev_get_drvdata(parent);
+	struct pwm_chip *chip = container_of(parent, struct pwm_chip, dev);
 	unsigned int i;
 	int ret = 0;
 
@@ -442,7 +442,7 @@ static int pwm_class_resume_npwm(struct device *parent, unsigned int npwm)
 
 static int pwm_class_suspend(struct device *parent)
 {
-	struct pwm_chip *chip = dev_get_drvdata(parent);
+	struct pwm_chip *chip = container_of(parent, struct pwm_chip, dev);
 	unsigned int i;
 	int ret = 0;
 
@@ -483,59 +483,30 @@ static int pwm_class_suspend(struct device *parent)
 
 static int pwm_class_resume(struct device *parent)
 {
-	struct pwm_chip *chip = dev_get_drvdata(parent);
+	struct pwm_chip *chip = container_of(parent, struct pwm_chip, dev);
 
 	return pwm_class_resume_npwm(parent, chip->npwm);
 }
 
 static DEFINE_SIMPLE_DEV_PM_OPS(pwm_class_pm_ops, pwm_class_suspend, pwm_class_resume);
 
-static struct class pwm_class = {
+struct class pwm_class = {
 	.name = "pwm",
 	.dev_groups = pwm_chip_groups,
 	.pm = pm_sleep_ptr(&pwm_class_pm_ops),
 };
 
-static int pwmchip_sysfs_match(struct device *parent, const void *data)
-{
-	return dev_get_drvdata(parent) == data;
-}
-
-void pwmchip_sysfs_export(struct pwm_chip *chip)
-{
-	struct device *parent;
-
-	/*
-	 * If device_create() fails the pwm_chip is still usable by
-	 * the kernel it's just not exported.
-	 */
-	parent = device_create(&pwm_class, chip->dev, MKDEV(0, 0), chip,
-			       "pwmchip%d", chip->id);
-	if (IS_ERR(parent)) {
-		dev_warn(chip->dev,
-			 "device_create failed for pwm_chip sysfs export\n");
-	}
-}
-
 void pwmchip_sysfs_unexport(struct pwm_chip *chip)
 {
-	struct device *parent;
+	struct device *parent = &chip->dev;
 	unsigned int i;
 
-	parent = class_find_device(&pwm_class, NULL, chip,
-				   pwmchip_sysfs_match);
-	if (!parent)
-		return;
-
 	for (i = 0; i < chip->npwm; i++) {
 		struct pwm_device *pwm = &chip->pwms[i];
 
 		if (test_bit(PWMF_EXPORTED, &pwm->flags))
 			pwm_unexport_child(parent, pwm);
 	}
-
-	put_device(parent);
-	device_unregister(parent);
 }
 
 static int __init pwm_sysfs_init(void)
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index eb91306ba28e..8b4aca36c35f 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -2,6 +2,7 @@
 #ifndef __LINUX_PWM_H
 #define __LINUX_PWM_H
 
+#include <linux/device.h>
 #include <linux/err.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
@@ -289,7 +290,7 @@ struct pwm_ops {
  * @pwms: array of PWM devices allocated by the framework
  */
 struct pwm_chip {
-	struct device *dev;
+	struct device dev;
 	const struct pwm_ops *ops;
 	struct module *owner;
 	unsigned int id;
@@ -307,7 +308,7 @@ struct pwm_chip {
 
 static inline struct device *pwmchip_parent(struct pwm_chip *chip)
 {
-	return chip->dev;
+	return chip->dev.parent;
 }
 
 static inline void *pwmchip_get_drvdata(struct pwm_chip *chip)
@@ -592,17 +593,7 @@ static inline void pwm_remove_table(struct pwm_lookup *table, size_t num)
 }
 #endif
 
-#ifdef CONFIG_PWM_SYSFS
-void pwmchip_sysfs_export(struct pwm_chip *chip);
+extern struct class pwm_class;
 void pwmchip_sysfs_unexport(struct pwm_chip *chip);
-#else
-static inline void pwmchip_sysfs_export(struct pwm_chip *chip)
-{
-}
-
-static inline void pwmchip_sysfs_unexport(struct pwm_chip *chip)
-{
-}
-#endif /* CONFIG_PWM_SYSFS */
 
 #endif /* __LINUX_PWM_H */
-- 
2.42.0

[PATCH v4 113/115] pwm: Add more locking

[Uwe Kleine-König]

This ensures that a pwm_chip that has no corresponding driver isn't used
and that a driver doesn't go away while a callback is still running.

As with the previous commit this is not needed yet, but once we have PWM
character device support this is required for race-free operation.

To not serialize all pwm_apply_state() calls, this introduces a per chip
lock. To prepare for a more sophisticated locking scheme involving spin
locks instead of mutexes for "fast" chips, there are (for now trivial)
functions introduced for locking and unlocking.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/core.c  | 76 ++++++++++++++++++++++++++++++++++++++-------
 include/linux/pwm.h |  5 +++
 2 files changed, 69 insertions(+), 12 deletions(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 4805ccff5970..9cbbf675a84c 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -32,6 +32,16 @@ static DEFINE_MUTEX(pwm_lock);
 
 static DEFINE_IDR(pwmchip_idr);
 
+static void pwmchip_lock(struct pwm_chip *chip)
+{
+	mutex_lock(&chip->lock);
+}
+
+static void pwmchip_unlock(struct pwm_chip *chip)
+{
+	mutex_unlock(&chip->lock);
+}
+
 static struct pwm_chip *pwmchip_find_by_name(const char *name)
 {
 	struct pwm_chip *chip;
@@ -232,6 +242,7 @@ static struct pwm_chip *pwmchip_alloc(struct device *parent, unsigned int npwm,
 
 	chip->npwm = npwm;
 	chip->uses_pwmchip_alloc = true;
+	chip->operational = false;
 
 	pwmchip_set_drvdata(chip, pwmchip_priv(chip));
 
@@ -314,23 +325,29 @@ int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
 	if (IS_ENABLED(CONFIG_OF))
 		of_pwmchip_add(chip);
 
+	mutex_init(&chip->lock);
+
 	ret = device_add(&chip->dev);
 	if (ret)
 		goto err_device_add;
 
+	pwmchip_lock(chip);
+	chip->operational = true;
+	pwmchip_unlock(chip);
+
 	mutex_unlock(&pwm_lock);
 
 	return 0;
 
 err_device_add:
 
-	if (IS_ENABLED(CONFIG_OF))
-		of_pwmchip_remove(chip);
+	of_pwmchip_remove(chip);
 
 	idr_remove(&pwmchip_idr, chip->id);
 err_idr_alloc:
 
 	mutex_unlock(&pwm_lock);
+
 	module_put(owner);
 
 	return ret;
@@ -346,12 +363,27 @@ EXPORT_SYMBOL_GPL(__pwmchip_add);
 void pwmchip_remove(struct pwm_chip *chip)
 {
 	pwmchip_sysfs_unexport(chip);
+	unsigned int i;
 
 	if (IS_ENABLED(CONFIG_OF))
 		of_pwmchip_remove(chip);
 
 	mutex_lock(&pwm_lock);
 
+	pwmchip_lock(chip);
+	chip->operational = false;
+	pwmchip_unlock(chip);
+
+	for (i = 0; i < chip->npwm; ++i) {
+		struct pwm_device *pwm = &chip->pwms[i];
+
+		if (test_and_clear_bit(PWMF_REQUESTED, &pwm->flags)) {
+			dev_alert(&chip->dev, "Freeing requested PWM #%u\n", i);
+			if (pwm->chip->ops->free)
+				pwm->chip->ops->free(pwm->chip, pwm);
+		}
+	}
+
 	idr_remove(&pwmchip_idr, chip->id);
 
 	mutex_unlock(&pwm_lock);
@@ -527,7 +559,7 @@ static void pwm_apply_state_debug(struct pwm_device *pwm,
 int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
 {
 	struct pwm_chip *chip;
-	int err;
+	int err = 0;
 
 	/*
 	 * Some lowlevel driver's implementations of .apply() make use of
@@ -544,17 +576,24 @@ int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
 
 	chip = pwm->chip;
 
+	pwmchip_lock(chip);
+
+	if (!chip->operational) {
+		err = -ENXIO;
+		goto out_unlock;
+	}
+
 	if (state->period == pwm->state.period &&
 	    state->duty_cycle == pwm->state.duty_cycle &&
 	    state->polarity == pwm->state.polarity &&
 	    state->enabled == pwm->state.enabled &&
 	    state->usage_power == pwm->state.usage_power)
-		return 0;
+		goto out_unlock;
 
 	err = chip->ops->apply(chip, pwm, state);
 	trace_pwm_apply(pwm, state, err);
 	if (err)
-		return err;
+		goto out_unlock;
 
 	pwm->state = *state;
 
@@ -564,7 +603,10 @@ int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
 	 */
 	pwm_apply_state_debug(pwm, state);
 
-	return 0;
+out_unlock:
+	pwmchip_unlock(chip);
+
+	return err;
 }
 EXPORT_SYMBOL_GPL(pwm_apply_state);
 
@@ -588,7 +630,12 @@ int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result,
 		return -ENOSYS;
 
 	mutex_lock(&pwm_lock);
-	err = pwm->chip->ops->capture(pwm->chip, pwm, result, timeout);
+
+	if (pwm->chip->operational)
+		err = pwm->chip->ops->capture(pwm->chip, pwm, result, timeout);
+	else
+		err = -ENXIO;
+
 	mutex_unlock(&pwm_lock);
 
 	return err;
@@ -995,23 +1042,28 @@ EXPORT_SYMBOL_GPL(pwm_get);
  */
 void pwm_put(struct pwm_device *pwm)
 {
+	bool operational;
+
 	if (!pwm)
 		return;
 
 	mutex_lock(&pwm_lock);
 
-	if (!test_and_clear_bit(PWMF_REQUESTED, &pwm->flags)) {
-		pr_warn("PWM device already freed\n");
+	if (!test_and_clear_bit(PWMF_REQUESTED, &pwm->flags))
 		goto out;
-	}
 
-	if (pwm->chip->ops->free)
+	pwmchip_lock(pwm->chip);
+	operational = pwm->chip->operational;
+	pwmchip_unlock(pwm->chip);
+
+	if (operational && pwm->chip->ops->free)
 		pwm->chip->ops->free(pwm->chip, pwm);
 
 	pwm->label = NULL;
 
-	put_device(&pwm->chip->dev);
 out:
+	put_device(&pwm->chip->dev);
+
 	mutex_unlock(&pwm_lock);
 }
 EXPORT_SYMBOL_GPL(pwm_put);
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 8b4aca36c35f..1860225ab45b 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -287,6 +287,9 @@ struct pwm_ops {
  * @npwm: number of PWMs controlled by this chip
  * @of_xlate: request a PWM device given a device tree PWM specifier
  * @of_pwm_n_cells: number of cells expected in the device tree PWM specifier
+ * @lock: mutex protecting .operational and serializing ops and chip unregistration
+ * @uses_pwmchip_alloc: signals if pwmchip_allow was used to allocate this chip
+ * @operational: tracks if the chip is operational
  * @pwms: array of PWM devices allocated by the framework
  */
 struct pwm_chip {
@@ -301,7 +304,9 @@ struct pwm_chip {
 	unsigned int of_pwm_n_cells;
 
 	/* only used internally by the PWM framework */
+	struct mutex lock;
 	bool uses_pwmchip_alloc;
+	bool operational;
 	void *driver_data;
 	struct pwm_device pwms[] __counted_by(npwm);
 };
-- 
2.42.0

[PATCH v4 114/115] pwm: Make pwmchip_[sg]et_drvdata a wrapper around dev_set_drvdata

[Uwe Kleine-König]

Now that a pwm_chip has a dedicated struct device, pwmchip_set_drvdata()
and pwmchip_get_drvdata() can be made thin wrappers around
dev_set_drvdata() and dev_get_drvdata() respectively and the previously
needed pointer can be dropped from struct pwm_chip.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 include/linux/pwm.h | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 1860225ab45b..535bd5fea52a 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -307,7 +307,6 @@ struct pwm_chip {
 	struct mutex lock;
 	bool uses_pwmchip_alloc;
 	bool operational;
-	void *driver_data;
 	struct pwm_device pwms[] __counted_by(npwm);
 };
 
@@ -318,20 +317,12 @@ static inline struct device *pwmchip_parent(struct pwm_chip *chip)
 
 static inline void *pwmchip_get_drvdata(struct pwm_chip *chip)
 {
-	/*
-	 * After pwm_chip got a dedicated struct device, this can be replaced by
-	 * dev_get_drvdata(&chip->dev);
-	 */
-	return chip->driver_data;
+	return dev_get_drvdata(&chip->dev);
 }
 
 static inline void pwmchip_set_drvdata(struct pwm_chip *chip, void *data)
 {
-	/*
-	 * After pwm_chip got a dedicated struct device, this can be replaced by
-	 * dev_set_drvdata(&chip->dev, data);
-	 */
-	chip->driver_data = data;
+	dev_set_drvdata(&chip->dev, data);
 }
 
 #if IS_ENABLED(CONFIG_PWM)
-- 
2.42.0

[PATCH v4 115/115] WIP: pwm: Add support for pwmchip devices for faster and easier userspace access

[Uwe Kleine-König]

Todo:
 - reshuffle order of functions to get rid of forward decl of __pwm_apply_state
 - implement PWM_IOCTL_GET ioctls
 - drop debug output
 - maybe merge core.c and sysfs.c (separate commit?)

Not-yet-signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/core.c       | 251 ++++++++++++++++++++++++++++++++++-----
 drivers/pwm/sysfs.c      |  19 ++-
 include/linux/pwm.h      |   2 +
 include/uapi/linux/pwm.h |  23 ++++
 4 files changed, 267 insertions(+), 28 deletions(-)
 create mode 100644 include/uapi/linux/pwm.h

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 9cbbf675a84c..2affc4cb78e4 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -21,6 +21,8 @@
 
 #include <dt-bindings/pwm/pwm.h>
 
+#include <uapi/linux/pwm.h>
+
 #define CREATE_TRACE_POINTS
 #include <trace/events/pwm.h>
 
@@ -280,6 +282,189 @@ struct pwm_chip *devm_pwmchip_alloc(struct device *parent, unsigned int npwm, si
 }
 EXPORT_SYMBOL_GPL(devm_pwmchip_alloc);
 
+struct pwm_cdev_data {
+	struct pwm_chip *chip;
+	struct pwm_device *pwm[];
+};
+
+static int pwm_cdev_open(struct inode *inode, struct file *file)
+{
+	struct pwm_chip *chip = container_of(inode->i_cdev, struct pwm_chip, cdev);
+	struct pwm_cdev_data *cdata;
+	int ret;
+
+	pr_info("%s:%d\n", __func__, __LINE__);
+	mutex_lock(&pwm_lock);
+
+	if (!chip->operational) {
+		ret = -ENXIO;
+		goto out_unlock;
+	}
+
+	cdata = kzalloc(struct_size(cdata, pwm, chip->npwm), GFP_KERNEL);
+	if (!cdata) {
+		ret = -ENOMEM;
+		goto out_unlock;
+	}
+
+	cdata->chip = chip;
+
+	file->private_data = cdata;
+
+	ret = nonseekable_open(inode, file);
+
+out_unlock:
+	mutex_unlock(&pwm_lock);
+
+	return ret;
+}
+
+static int pwm_cdev_release(struct inode *inode, struct file *file)
+{
+	struct pwm_cdev_data *cdata = file->private_data;
+	unsigned int i;
+
+	for (i = 0; i < cdata->chip->npwm; ++i) {
+		if (cdata->pwm[i])
+			pwm_put(cdata->pwm[i]);
+	}
+	kfree(cdata);
+
+	return 0;
+}
+
+static int __pwm_apply_state(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state);
+
+static int pwm_cdev_request(struct pwm_cdev_data *cdata, unsigned int hwpwm)
+{
+	struct pwm_chip *chip = cdata->chip;
+
+	if (hwpwm >= chip->npwm)
+		return -EINVAL;
+
+	if (!cdata->pwm[hwpwm]) {
+		struct pwm_device *pwm = &chip->pwms[hwpwm];
+		int ret;
+
+		ret = pwm_device_request(pwm, "pwm-cdev");
+		if (ret < 0)
+			return ret;
+
+		cdata->pwm[hwpwm] = pwm;
+	}
+
+	return 0;
+}
+
+static int pwm_cdev_free(struct pwm_cdev_data *cdata, unsigned int hwpwm)
+{
+	struct pwm_chip *chip = cdata->chip;
+
+	if (hwpwm >= chip->npwm)
+		return -EINVAL;
+
+	if (cdata->pwm[hwpwm]) {
+		struct pwm_device *pwm = cdata->pwm[hwpwm];
+
+		pwm_put(pwm);
+
+		cdata->pwm[hwpwm] = NULL;
+	}
+
+	return 0;
+}
+
+static long pwm_cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	int ret = 0;
+	struct pwm_cdev_data *cdata = file->private_data;
+	struct pwm_chip *chip = cdata->chip;
+
+	mutex_lock(&pwm_lock);
+
+	if (!chip->operational) {
+		ret = -ENXIO;
+		goto out_unlock;
+	}
+
+	switch (cmd) {
+	case PWM_IOCTL_GET_NUM_PWMS:
+		ret = chip->npwm;
+		break;
+
+	case PWM_IOCTL_REQUEST:
+		{
+			unsigned int hwpwm;
+
+			ret = get_user(hwpwm, (unsigned int __user *)arg);
+			if (ret)
+				goto out_unlock;
+
+			ret = pwm_cdev_request(cdata, hwpwm);
+		}
+		break;
+
+	case PWM_IOCTL_FREE:
+		{
+			unsigned int hwpwm;
+
+			ret = get_user(hwpwm, (unsigned int __user *)arg);
+			if (ret)
+				goto out_unlock;
+
+			ret = pwm_cdev_free(cdata, hwpwm);
+
+		}
+		break;
+
+	case PWM_IOCTL_APPLY:
+		{
+			struct pwmchip_state cstate;
+			struct pwm_state state;
+			struct pwm_device *pwm;
+
+			ret = copy_from_user(&cstate, (struct pwmchip_state __user *)arg, sizeof(cstate));
+			if (ret)
+				goto out_unlock;
+
+			ret = pwm_cdev_request(cdata, cstate.hwpwm);
+			if (ret)
+				goto out_unlock;
+
+			pwm = cdata->pwm[cstate.hwpwm];
+
+			state.period = cstate.period;
+			state.duty_cycle = cstate.duty_cycle;
+			if (cstate.duty_offset >= cstate.period - cstate.duty_cycle)
+				state.polarity = PWM_POLARITY_INVERSED;
+			else
+				state.polarity = PWM_POLARITY_NORMAL;
+			state.enabled = cstate.period > 0;
+
+			ret = __pwm_apply_state(chip, pwm, &state);
+	        }
+		break;
+
+	default:
+		ret = -ENOTTY;
+		break;
+	}
+out_unlock:
+	mutex_unlock(&pwm_lock);
+
+	return ret;
+}
+
+static const struct file_operations pwm_cdev_fileops = {
+	.open = pwm_cdev_open,
+	.release = pwm_cdev_release,
+	.owner = THIS_MODULE,
+	.llseek = no_llseek,
+	.unlocked_ioctl = pwm_cdev_ioctl,
+};
+
+extern dev_t pwm_devt;
+
 /**
  * __pwmchip_add() - register a new PWM chip
  * @chip: the PWM chip to add
@@ -327,7 +512,13 @@ int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
 
 	mutex_init(&chip->lock);
 
-	ret = device_add(&chip->dev);
+	if (chip->id < 256)
+		chip->dev.devt = MKDEV(MAJOR(pwm_devt), chip->id);
+
+	cdev_init(&chip->cdev, &pwm_cdev_fileops);
+	chip->cdev.owner = owner;
+
+	ret = cdev_device_add(&chip->cdev, &chip->dev);
 	if (ret)
 		goto err_device_add;
 
@@ -390,7 +581,7 @@ void pwmchip_remove(struct pwm_chip *chip)
 
 	module_put(chip->owner);
 
-	device_del(&chip->dev);
+	cdev_device_del(&chip->cdev, &chip->dev);
 }
 EXPORT_SYMBOL_GPL(pwmchip_remove);
 
@@ -551,6 +742,36 @@ static void pwm_apply_state_debug(struct pwm_device *pwm,
 	}
 }
 
+static int __pwm_apply_state(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state)
+{
+	int err;
+
+	if (!chip->operational)
+		return -ENXIO;
+
+	if (state->period == pwm->state.period &&
+	    state->duty_cycle == pwm->state.duty_cycle &&
+	    state->polarity == pwm->state.polarity &&
+	    state->enabled == pwm->state.enabled &&
+	    state->usage_power == pwm->state.usage_power)
+		return 0;
+
+	err = chip->ops->apply(chip, pwm, state);
+	trace_pwm_apply(pwm, state, err);
+	if (err)
+		return err;
+
+	pwm->state = *state;
+
+	/*
+	 * only do this after pwm->state was applied as some
+	 * implementations of .get_state depend on this
+	 */
+	pwm_apply_state_debug(pwm, state);
+
+	return err;
+}
+
 /**
  * pwm_apply_state() - atomically apply a new state to a PWM device
  * @pwm: PWM device
@@ -578,32 +799,8 @@ int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
 
 	pwmchip_lock(chip);
 
-	if (!chip->operational) {
-		err = -ENXIO;
-		goto out_unlock;
-	}
+	err = __pwm_apply_state(chip, pwm, state);
 
-	if (state->period == pwm->state.period &&
-	    state->duty_cycle == pwm->state.duty_cycle &&
-	    state->polarity == pwm->state.polarity &&
-	    state->enabled == pwm->state.enabled &&
-	    state->usage_power == pwm->state.usage_power)
-		goto out_unlock;
-
-	err = chip->ops->apply(chip, pwm, state);
-	trace_pwm_apply(pwm, state, err);
-	if (err)
-		goto out_unlock;
-
-	pwm->state = *state;
-
-	/*
-	 * only do this after pwm->state was applied as some
-	 * implementations of .get_state depend on this
-	 */
-	pwm_apply_state_debug(pwm, state);
-
-out_unlock:
 	pwmchip_unlock(chip);
 
 	return err;
diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
index 3a438b29c777..e5bbff32b719 100644
--- a/drivers/pwm/sysfs.c
+++ b/drivers/pwm/sysfs.c
@@ -8,6 +8,7 @@
  */
 
 #include <linux/device.h>
+#include <linux/fs.h>
 #include <linux/mutex.h>
 #include <linux/err.h>
 #include <linux/slab.h>
@@ -509,8 +510,24 @@ void pwmchip_sysfs_unexport(struct pwm_chip *chip)
 	}
 }
 
+dev_t pwm_devt;
+
 static int __init pwm_sysfs_init(void)
 {
-	return class_register(&pwm_class);
+	int ret;
+
+	ret = alloc_chrdev_region(&pwm_devt, 0, 256, "pwm");
+	if (ret) {
+		pr_warn("Failed to initialize chrdev region for PWM usage\n");
+		return ret;
+	}
+
+	ret = class_register(&pwm_class);
+	if (ret) {
+		pr_warn("Failed to register PWM class\n");
+		unregister_chrdev_region(pwm_devt, 256);
+	}
+
+	return ret;
 }
 subsys_initcall(pwm_sysfs_init);
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 535bd5fea52a..fd6d11202d2b 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -2,6 +2,7 @@
 #ifndef __LINUX_PWM_H
 #define __LINUX_PWM_H
 
+#include <linux/cdev.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/mutex.h>
@@ -294,6 +295,7 @@ struct pwm_ops {
  */
 struct pwm_chip {
 	struct device dev;
+	struct cdev cdev;
 	const struct pwm_ops *ops;
 	struct module *owner;
 	unsigned int id;
diff --git a/include/uapi/linux/pwm.h b/include/uapi/linux/pwm.h
new file mode 100644
index 000000000000..22f1bf8df54d
--- /dev/null
+++ b/include/uapi/linux/pwm.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
+
+#ifndef _UAPI_PWM_H_
+#define _UAPI_PWM_H_
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+struct pwmchip_state {
+	/* Make alignment arch-independant */
+	unsigned int hwpwm;
+	__u64 period;
+	__u64 duty_cycle;
+	__u64 duty_offset;
+};
+
+#define PWM_IOCTL_GET_NUM_PWMS	_IO(0x75, 0)
+#define PWM_IOCTL_REQUEST	_IOW(0x75, 1, unsigned int)
+#define PWM_IOCTL_FREE		_IOW(0x75, 2, unsigned int)
+#define PWM_IOCTL_APPLY		_IOW(0x75, 3, struct pwmchip_state)
+#define PWM_IOCTL_GET		_IOWR(0x75, 4, struct pwmchip_state)
+
+#endif /* _UAPI_PWM_H_ */
-- 
2.42.0

Re: [PATCH v4 086/115] pwm: rockchip: Make use of devm_pwmchip_alloc() function

[Heiko Stübner]

Am Mittwoch, 6. Dezember 2023, 12:44:40 CET schrieb Uwe Kleine-König:
> This prepares the pwm-rockchip driver to further changes of the pwm core
> outlined in the commit introducing devm_pwmchip_alloc(). There is no
> intended semantical change and the driver should behave as before.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

I looked the important patches up on lore (adding devm_pwmchip_alloc
for example) and the change looks correct, so

Reviewed-by: Heiko Stuebner <heiko@sntech.de>

Re: [PATCH v4 097/115] pwm: sun4i: Make use of devm_pwmchip_alloc() function

[Andre Przywara]

On Wed,  6 Dec 2023 12:44:51 +0100
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote:

Hi,

> This prepares the pwm-sun4i driver to further changes of the pwm core
> outlined in the commit introducing devm_pwmchip_alloc(). There is no
> intended semantical change and the driver should behave as before.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

That looks alright to me, it's really only wrapping the access to
struct sun4i_pwm_chip using the newly provided functions.

Reviewed-by: Andre Przywara <andre.przywara@arm.com>

Cheers,
Andre

> ---
>  drivers/pwm/pwm-sun4i.c | 34 +++++++++++++++++++---------------
>  1 file changed, 19 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c
> index 44edf1ce5739..36a8dc65b19c 100644
> --- a/drivers/pwm/pwm-sun4i.c
> +++ b/drivers/pwm/pwm-sun4i.c
> @@ -81,7 +81,6 @@ struct sun4i_pwm_data {
>  };
>  
>  struct sun4i_pwm_chip {
> -	struct pwm_chip chip;
>  	struct clk *bus_clk;
>  	struct clk *clk;
>  	struct reset_control *rst;
> @@ -92,7 +91,7 @@ struct sun4i_pwm_chip {
>  
>  static inline struct sun4i_pwm_chip *to_sun4i_pwm_chip(struct pwm_chip *chip)
>  {
> -	return container_of(chip, struct sun4i_pwm_chip, chip);
> +	return pwmchip_get_drvdata(chip);
>  }
>  
>  static inline u32 sun4i_pwm_readl(struct sun4i_pwm_chip *chip,
> @@ -384,17 +383,22 @@ MODULE_DEVICE_TABLE(of, sun4i_pwm_dt_ids);
>  
>  static int sun4i_pwm_probe(struct platform_device *pdev)
>  {
> +	struct pwm_chip *chip;
>  	struct sun4i_pwm_chip *sun4ichip;
> +	const struct sun4i_pwm_data *data;
>  	int ret;
>  
> -	sun4ichip = devm_kzalloc(&pdev->dev, sizeof(*sun4ichip), GFP_KERNEL);
> -	if (!sun4ichip)
> -		return -ENOMEM;
> -
> -	sun4ichip->data = of_device_get_match_data(&pdev->dev);
> -	if (!sun4ichip->data)
> +	data = of_device_get_match_data(&pdev->dev);
> +	if (!data)
>  		return -ENODEV;
>  
> +	chip = devm_pwmchip_alloc(&pdev->dev, data->npwm, sizeof(*sun4ichip));
> +	if (IS_ERR(chip))
> +		return PTR_ERR(chip);
> +	sun4ichip = to_sun4i_pwm_chip(chip);
> +
> +	sun4ichip->data = data;
> +
>  	sun4ichip->base = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(sun4ichip->base))
>  		return PTR_ERR(sun4ichip->base);
> @@ -451,19 +455,18 @@ static int sun4i_pwm_probe(struct platform_device *pdev)
>  		goto err_bus;
>  	}
>  
> -	sun4ichip->chip.dev = &pdev->dev;
> -	sun4ichip->chip.ops = &sun4i_pwm_ops;
> -	sun4ichip->chip.npwm = sun4ichip->data->npwm;
> +	chip->ops = &sun4i_pwm_ops;
> +	chip->npwm = sun4ichip->data->npwm;
>  
>  	spin_lock_init(&sun4ichip->ctrl_lock);
>  
> -	ret = pwmchip_add(&sun4ichip->chip);
> +	ret = pwmchip_add(chip);
>  	if (ret < 0) {
>  		dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
>  		goto err_pwm_add;
>  	}
>  
> -	platform_set_drvdata(pdev, sun4ichip);
> +	platform_set_drvdata(pdev, chip);
>  
>  	return 0;
>  
> @@ -477,9 +480,10 @@ static int sun4i_pwm_probe(struct platform_device *pdev)
>  
>  static void sun4i_pwm_remove(struct platform_device *pdev)
>  {
> -	struct sun4i_pwm_chip *sun4ichip = platform_get_drvdata(pdev);
> +	struct pwm_chip *chip = platform_get_drvdata(pdev);
> +	struct sun4i_pwm_chip *sun4ichip = to_sun4i_pwm_chip(chip);
>  
> -	pwmchip_remove(&sun4ichip->chip);
> +	pwmchip_remove(chip);
>  
>  	clk_disable_unprepare(sun4ichip->bus_clk);
>  	reset_control_assert(sun4ichip->rst);

Re: [PATCH v4 006/115] pwm: cros-ec: Change prototype of helpers to prepare further changes

[Tzung-Bi Shih]

On Wed, Dec 06, 2023 at 12:43:20PM +0100, Uwe Kleine-König wrote:
> pwm_chip allocation and registration is about to change. For that the
> number of PWM devices must be known earlier in cros_ec_pwm_probe(). So
> make cros_ec_pwm_get_duty() and cros_ec_num_pwms() independent of
> struct cros_ec_pwm_device which is only available later.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>

Re: [PATCH v4 057/115] pwm: cros-ec: Make use of devm_pwmchip_alloc() function

[Tzung-Bi Shih]

On Wed, Dec 06, 2023 at 12:44:11PM +0100, Uwe Kleine-König wrote:
> This prepares the pwm-cros-ec driver to further changes of the pwm core
> outlined in the commit introducing devm_pwmchip_alloc(). There is no
> intended semantical change and the driver should behave as before.
> The probe function had to be changed a bit because the number of PWMs
> must be determined before allocation of the pwm_chip and its private
> data now.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>

Re: [PATCH v4 108/115] leds: qcom-lpg: Make use of devm_pwmchip_alloc() function

[Lee Jones]

On Wed, 06 Dec 2023, Uwe Kleine-König wrote:

> This prepares the pwm sub-driver to further changes of the pwm core
> outlined in the commit introducing devm_pwmchip_alloc(). There is no
> intended semantical change and the driver should behave as before.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> ---
>  drivers/leds/rgb/leds-qcom-lpg.c | 16 ++++++++++------
>  1 file changed, 10 insertions(+), 6 deletions(-)

Acked-by: Lee Jones <lee@kernel.org>

> diff --git a/drivers/leds/rgb/leds-qcom-lpg.c b/drivers/leds/rgb/leds-qcom-lpg.c
> index 156b73d1f4a2..0a7acf59a420 100644
> --- a/drivers/leds/rgb/leds-qcom-lpg.c
> +++ b/drivers/leds/rgb/leds-qcom-lpg.c
> @@ -77,7 +77,7 @@ struct lpg {
>  
>  	struct mutex lock;
>  
> -	struct pwm_chip pwm;
> +	struct pwm_chip *pwm;
>  
>  	const struct lpg_data *data;
>  
> @@ -978,7 +978,7 @@ static int lpg_pattern_mc_clear(struct led_classdev *cdev)
>  
>  static inline struct lpg *lpg_pwm_from_chip(struct pwm_chip *chip)
>  {
> -	return container_of(chip, struct lpg, pwm);
> +	return pwmchip_get_drvdata(chip);
>  }
>  
>  static int lpg_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
> @@ -1093,13 +1093,17 @@ static const struct pwm_ops lpg_pwm_ops = {
>  
>  static int lpg_add_pwm(struct lpg *lpg)
>  {
> +	struct pwm_chip *chip;
>  	int ret;
>  
> -	lpg->pwm.dev = lpg->dev;
> -	lpg->pwm.npwm = lpg->num_channels;
> -	lpg->pwm.ops = &lpg_pwm_ops;
> +	lpg->pwm = chip = devm_pwmchip_alloc(lpg->dev, lpg->num_channels, 0);
> +	if (IS_ERR(chip))
> +		return PTR_ERR(chip);
>  
> -	ret = devm_pwmchip_add(lpg->dev, &lpg->pwm);
> +	chip->ops = &lpg_pwm_ops;
> +	pwmchip_set_drvdata(chip, lpg);
> +
> +	ret = devm_pwmchip_add(lpg->dev, chip);
>  	if (ret)
>  		dev_err_probe(lpg->dev, ret, "failed to add PWM chip\n");
>  
> -- 
> 2.42.0
> 

-- 
Lee Jones [李琼斯]

Re: [PATCH v4 089/115] pwm: sifive: Make use of devm_pwmchip_alloc() function

[Emil Renner Berthing]

Uwe Kleine-König wrote:
> This prepares the pwm-sifive driver to further changes of the pwm core
> outlined in the commit introducing devm_pwmchip_alloc(). There is no
> intended semantical change and the driver should behave as before.
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> ---
>  drivers/pwm/pwm-sifive.c | 28 ++++++++++++++--------------
>  1 file changed, 14 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/pwm/pwm-sifive.c b/drivers/pwm/pwm-sifive.c
> index c1b412905d9e..cf3fcffe7b3a 100644
> --- a/drivers/pwm/pwm-sifive.c
> +++ b/drivers/pwm/pwm-sifive.c
> @@ -41,7 +41,7 @@
>  #define PWM_SIFIVE_DEFAULT_PERIOD	10000000
>
>  struct pwm_sifive_ddata {
> -	struct pwm_chip	chip;
> +	struct pwm_chip *chip;

In patch 43 you do ddata = (void *)chip + sizeof(*chip). Shouldn't we
be able to get
the chip pointer from ddata using chip = (void *)ddata - sizeof(*chip)?

>  	struct mutex lock; /* lock to protect user_count and approx_period */
>  	struct notifier_block notifier;
>  	struct clk *clk;
> @@ -54,7 +54,7 @@ struct pwm_sifive_ddata {
>  static inline
>  struct pwm_sifive_ddata *pwm_sifive_chip_to_ddata(struct pwm_chip *chip)
>  {
> -	return container_of(chip, struct pwm_sifive_ddata, chip);
> +	return pwmchip_get_drvdata(chip);
>  }
>
>  static int pwm_sifive_request(struct pwm_chip *chip, struct pwm_device *pwm)
> @@ -102,7 +102,7 @@ static void pwm_sifive_update_clock(struct pwm_sifive_ddata *ddata,
>  	/* As scale <= 15 the shift operation cannot overflow. */
>  	num = (unsigned long long)NSEC_PER_SEC << (PWM_SIFIVE_CMPWIDTH + scale);
>  	ddata->real_period = div64_ul(num, rate);
> -	dev_dbg(pwmchip_parent(&ddata->chip),
> +	dev_dbg(pwmchip_parent(ddata->chip),
>  		"New real_period = %u ns\n", ddata->real_period);
>  }
>
> @@ -230,15 +230,14 @@ static int pwm_sifive_probe(struct platform_device *pdev)
>  	u32 val;
>  	unsigned int enabled_pwms = 0, enabled_clks = 1;
>
> -	ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
> -	if (!ddata)
> -		return -ENOMEM;
> +	chip = devm_pwmchip_alloc(dev, 4, sizeof(*ddata));
> +	if (IS_ERR(chip))
> +		return PTR_ERR(chip);
> +	ddata = pwm_sifive_chip_to_ddata(chip);
> +	ddata->chip = chip;
>
>  	mutex_init(&ddata->lock);
> -	chip = &ddata->chip;
> -	chip->dev = dev;
>  	chip->ops = &pwm_sifive_ops;
> -	chip->npwm = 4;
>
>  	ddata->regs = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(ddata->regs))
> @@ -296,7 +295,7 @@ static int pwm_sifive_probe(struct platform_device *pdev)
>  		goto unregister_clk;
>  	}
>
> -	platform_set_drvdata(pdev, ddata);
> +	platform_set_drvdata(pdev, chip);
>  	dev_dbg(dev, "SiFive PWM chip registered %d PWMs\n", chip->npwm);
>
>  	return 0;
> @@ -314,15 +313,16 @@ static int pwm_sifive_probe(struct platform_device *pdev)
>
>  static void pwm_sifive_remove(struct platform_device *dev)
>  {
> -	struct pwm_sifive_ddata *ddata = platform_get_drvdata(dev);
> +	struct pwm_chip *chip = platform_get_drvdata(dev);
> +	struct pwm_sifive_ddata *ddata = pwm_sifive_chip_to_ddata(chip);
>  	struct pwm_device *pwm;
>  	int ch;
>
> -	pwmchip_remove(&ddata->chip);
> +	pwmchip_remove(chip);
>  	clk_notifier_unregister(ddata->clk, &ddata->notifier);
>
> -	for (ch = 0; ch < ddata->chip.npwm; ch++) {
> -		pwm = &ddata->chip.pwms[ch];
> +	for (ch = 0; ch < chip->npwm; ch++) {
> +		pwm = &chip->pwms[ch];
>  		if (pwm->state.enabled)
>  			clk_disable(ddata->clk);
>  	}
> --
> 2.42.0
>
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

Re: [PATCH v4 089/115] pwm: sifive: Make use of devm_pwmchip_alloc() function

[Uwe Kleine-König]

[-- Attachment #1: Type: text/plain, Size: 1822 bytes --]

Hello Emil,

On Fri, Dec 08, 2023 at 04:30:41AM -0500, Emil Renner Berthing wrote:
> Uwe Kleine-König wrote:
> > This prepares the pwm-sifive driver to further changes of the pwm core
> > outlined in the commit introducing devm_pwmchip_alloc(). There is no
> > intended semantical change and the driver should behave as before.
> >
> > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> > ---
> >  drivers/pwm/pwm-sifive.c | 28 ++++++++++++++--------------
> >  1 file changed, 14 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/pwm/pwm-sifive.c b/drivers/pwm/pwm-sifive.c
> > index c1b412905d9e..cf3fcffe7b3a 100644
> > --- a/drivers/pwm/pwm-sifive.c
> > +++ b/drivers/pwm/pwm-sifive.c
> > @@ -41,7 +41,7 @@
> >  #define PWM_SIFIVE_DEFAULT_PERIOD	10000000
> >
> >  struct pwm_sifive_ddata {
> > -	struct pwm_chip	chip;
> > +	struct pwm_chip *chip;
> 
> In patch 43 you do ddata = (void *)chip + sizeof(*chip). Shouldn't we
> be able to get
> the chip pointer from ddata using chip = (void *)ddata - sizeof(*chip)?

That would work, but I don't want to use that implementation detail in
lowlevel drivers. Also it's a bit obscure because not all drivers use
the driver data located after the pwmchip. Another difficulty is that
starting with patch #111 the memory layout changes and you can only
determine the chip from the driver data if you know the value of npwm.
(So you need information from the chip to get access to the chip. huch)

> >  	struct mutex lock; /* lock to protect user_count and approx_period */
> >  	struct notifier_block notifier;
> >  	struct clk *clk;

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

Re: [PATCH v4 089/115] pwm: sifive: Make use of devm_pwmchip_alloc() function

[Emil Renner Berthing]

Uwe Kleine-König wrote:
> Hello Emil,
>
> On Fri, Dec 08, 2023 at 04:30:41AM -0500, Emil Renner Berthing wrote:
> > Uwe Kleine-König wrote:
> > > This prepares the pwm-sifive driver to further changes of the pwm core
> > > outlined in the commit introducing devm_pwmchip_alloc(). There is no
> > > intended semantical change and the driver should behave as before.
> > >
> > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> > > ---
> > >  drivers/pwm/pwm-sifive.c | 28 ++++++++++++++--------------
> > >  1 file changed, 14 insertions(+), 14 deletions(-)
> > >
> > > diff --git a/drivers/pwm/pwm-sifive.c b/drivers/pwm/pwm-sifive.c
> > > index c1b412905d9e..cf3fcffe7b3a 100644
> > > --- a/drivers/pwm/pwm-sifive.c
> > > +++ b/drivers/pwm/pwm-sifive.c
> > > @@ -41,7 +41,7 @@
> > >  #define PWM_SIFIVE_DEFAULT_PERIOD	10000000
> > >
> > >  struct pwm_sifive_ddata {
> > > -	struct pwm_chip	chip;
> > > +	struct pwm_chip *chip;
> >
> > In patch 43 you do ddata = (void *)chip + sizeof(*chip). Shouldn't we
> > be able to get
> > the chip pointer from ddata using chip = (void *)ddata - sizeof(*chip)?
>
> That would work, but I don't want to use that implementation detail in
> lowlevel drivers. Also it's a bit obscure because not all drivers use
> the driver data located after the pwmchip. Another difficulty is that
> starting with patch #111 the memory layout changes and you can only
> determine the chip from the driver data if you know the value of npwm.
> (So you need information from the chip to get access to the chip. huch)

Ah, yeah it would of course need wrappers so drivers won't need to do the
calculation, but the last past definitely makes sense.

>
> > >  	struct mutex lock; /* lock to protect user_count and approx_period */
> > >  	struct notifier_block notifier;
> > >  	struct clk *clk;
>
> Best regards
> Uwe
>
> --
> Pengutronix e.K.                           | Uwe Kleine-König            |
> Industrial Linux Solutions                 | https://www.pengutronix.de/ |

Re: [PATCH v4 000/115] pwm: Fix lifetime issues for pwm_chips

[Thierry Reding]

[-- Attachment #1.1: Type: text/plain, Size: 3140 bytes --]

On Wed, Dec 06, 2023 at 12:43:14PM +0100, Uwe Kleine-König wrote:
> Hello,
> 
> This series is based on Thierry's for-next.
> 
> It starts with some cleanups that were all sent out separately already:
> 
>  - "pwm: Reduce number of pointer dereferences in pwm_device_request()"
>    https://lore.kernel.org/linux-pwm/20231130072105.966848-1-u.kleine-koenig@pengutronix.de
>  - "pwm: crc: Use consistent variable naming for driver data"
>    https://lore.kernel.org/linux-pwm/20231130074133.969806-1-u.kleine-koenig@pengutronix.de
>  - Two leds/qcom-lpg patches
>    https://lore.kernel.org/linux-leds/20231126095230.683204-1-u.kleine-koenig@pengutronix.de
>    Lee already claimed to have taken the series already, but it's not yet in
>    next.
>  - "leds: qcom-lpg: Introduce a wrapper for getting driver data from a pwm chip"
>    https://lore.kernel.org/linux-leds/20231124215208.616551-3-u.kleine-koenig@pengutronix.de
> 
> In the following patches I changed:
> 
>  - "pwm: cros-ec: Change prototype of helper to prepare further changes" +
>    This was simplified in response to feedback by Tzung-Bi Shih
>  - Make pwmchip_priv() static (and don't export it), let drivers use a new
>    pwmchip_get_drvdata() instead.
>  - For drm/ti-sn65dsi86.c and leds/qcom-lpg make use of
>    pwmchip_set_drvdata() which makes the conversion to
>    devm_pwmchip_alloc() much prettier.
>  - Some cleanups here and there
>  - Add review tags received in v3
>    I kept all tags even though the pwmchip_alloc() patches changed
>    slightly. Most of the time that's only
>    s/pwmchip_priv/pwmchip_get_drvdata/ though. Still, if you object,
>    just tell me. (This affects Paul Cercueil on patch #68, Conor Dooley
>    on patch #76 and Greg for patch #109.)
> 
> I kept the pwmchip_alloc() + pwmchip_register() approach despite Bart
> not liking it. To balance that out I don't like Bart's alternative
> approach. There are no technically relevant differences between the two
> approaches and no benchmarks that show either of the two to be better
> than the other. Conceptually the design ideas around pwmchip_alloc() +
> pwmchip_register() are used in several other subsystems, so it's a
> proven way to do things.

[Trimming the recipients, keeping only Bart and the mailing lists.]

I do think there are technically relevant differences. For one, the
better we isolate the internal data structure, the easier this becomes
to manage. I'm attaching a patch that I've prototyped which should
basically get us to somewhere around patch 110 of this series but with
something like 1/8th of the changes. It doesn't need every driver to
change and (mostly) decouples driver code from the core code.

Now, I know that you think this is all bad because it's not a single
allocation, but I much prefer the end result because it's got the driver
and internals much more cleanly separated. Going forward I think it
would be easier to apply all the ref-counting on top of that because we
only need to keep the PWM framework-internal data structure alive after
a PWM chip has gone away.

Thierry

[-- Attachment #1.2: 0001-pwm-Isolate-internal-data-into-a-separate-structure.patch --]
[-- Type: text/plain, Size: 32685 bytes --]

From 72ea79887d96850f9ccc832ce52b907ca276c940 Mon Sep 17 00:00:00 2001
From: Thierry Reding <thierry.reding@gmail.com>
Date: Tue, 28 Nov 2023 15:42:39 +0100
Subject: [PATCH] pwm: Isolate internal data into a separate structure

In order to prepare for proper reference counting of PWM chips and PWM
devices, move the internal data from the public PWM chip to a private
PWM chip structure. This ensures that the data that the subsystem core
may need to reference later on can stick around beyond the lifetime of
the driver-private data.

Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
---
 drivers/pwm/core.c            | 185 +++++++++++++++++++++-------------
 drivers/pwm/internal.h        |  38 +++++++
 drivers/pwm/pwm-atmel-hlcdc.c |   8 +-
 drivers/pwm/pwm-fsl-ftm.c     |   6 +-
 drivers/pwm/pwm-lpc18xx-sct.c |   4 +-
 drivers/pwm/pwm-lpss.c        |  14 +--
 drivers/pwm/pwm-pca9685.c     |   6 +-
 drivers/pwm/pwm-samsung.c     |   6 +-
 drivers/pwm/pwm-sifive.c      |   4 +-
 drivers/pwm/pwm-stm32-lp.c    |   6 +-
 drivers/pwm/pwm-stm32.c       |   6 +-
 drivers/pwm/pwm-tiecap.c      |   6 +-
 drivers/pwm/pwm-tiehrpwm.c    |   6 +-
 drivers/pwm/sysfs.c           |  48 ++++-----
 include/linux/pwm.h           |  26 +----
 15 files changed, 228 insertions(+), 141 deletions(-)
 create mode 100644 drivers/pwm/internal.h

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index f60b715abe62..54d57dec6dce 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -24,17 +24,19 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/pwm.h>
 
+#include "internal.h"
+
 static DEFINE_MUTEX(pwm_lookup_lock);
 static LIST_HEAD(pwm_lookup_list);
 
-/* protects access to pwmchip_idr */
+/* protects access to pwm_chips */
 static DEFINE_MUTEX(pwm_lock);
 
-static DEFINE_IDR(pwmchip_idr);
+static DEFINE_IDR(pwm_chips);
 
 static struct pwm_chip *pwmchip_find_by_name(const char *name)
 {
-	struct pwm_chip *chip;
+	struct pwm_chip_private *priv;
 	unsigned long id, tmp;
 
 	if (!name)
@@ -42,12 +44,12 @@ static struct pwm_chip *pwmchip_find_by_name(const char *name)
 
 	mutex_lock(&pwm_lock);
 
-	idr_for_each_entry_ul(&pwmchip_idr, chip, tmp, id) {
-		const char *chip_name = dev_name(chip->dev);
+	idr_for_each_entry_ul(&pwm_chips, priv, tmp, id) {
+		const char *chip_name = dev_name(priv->chip->dev);
 
 		if (chip_name && strcmp(chip_name, name) == 0) {
 			mutex_unlock(&pwm_lock);
-			return chip;
+			return priv->chip;
 		}
 	}
 
@@ -58,23 +60,24 @@ static struct pwm_chip *pwmchip_find_by_name(const char *name)
 
 static int pwm_device_request(struct pwm_device *pwm, const char *label)
 {
+	struct pwm_chip *chip = pwm->priv->chip;
 	int err;
 
 	if (test_bit(PWMF_REQUESTED, &pwm->flags))
 		return -EBUSY;
 
-	if (!try_module_get(pwm->chip->owner))
+	if (!try_module_get(pwm->priv->owner))
 		return -ENODEV;
 
-	if (pwm->chip->ops->request) {
-		err = pwm->chip->ops->request(pwm->chip, pwm);
+	if (chip->ops->request) {
+		err = chip->ops->request(chip, pwm);
 		if (err) {
-			module_put(pwm->chip->owner);
+			module_put(pwm->priv->owner);
 			return err;
 		}
 	}
 
-	if (pwm->chip->ops->get_state) {
+	if (chip->ops->get_state) {
 		/*
 		 * Zero-initialize state because most drivers are unaware of
 		 * .usage_power. The other members of state are supposed to be
@@ -84,7 +87,7 @@ static int pwm_device_request(struct pwm_device *pwm, const char *label)
 		 */
 		struct pwm_state state = { 0, };
 
-		err = pwm->chip->ops->get_state(pwm->chip, pwm, &state);
+		err = chip->ops->get_state(chip, pwm, &state);
 		trace_pwm_get(pwm, &state, err);
 
 		if (!err)
@@ -196,6 +199,64 @@ static bool pwm_ops_check(const struct pwm_chip *chip)
 	return true;
 }
 
+static struct pwm_chip_private *pwmchip_alloc(struct pwm_chip *chip,
+					      struct module *owner)
+{
+	struct pwm_chip_private *priv;
+	struct pwm_device *pwm;
+	unsigned int i;
+	int err;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return ERR_PTR(-ENOMEM);
+
+	priv->pwms = kcalloc(chip->npwm, sizeof(*pwm), GFP_KERNEL);
+	if (!priv->pwms) {
+		err = -ENOMEM;
+		goto free;
+	}
+
+	priv->owner = owner;
+	priv->chip = chip;
+
+	for (i = 0; i < chip->npwm; i++) {
+		struct pwm_device *pwm = &priv->pwms[i];
+
+		pwm->priv = priv;
+		pwm->hwpwm = i;
+	}
+
+	mutex_lock(&pwm_lock);
+
+	err = idr_alloc(&pwm_chips, priv, 0, 0, GFP_KERNEL);
+	if (err < 0) {
+		mutex_unlock(&pwm_lock);
+		goto free;
+	}
+
+	mutex_unlock(&pwm_lock);
+
+	priv->id = err;
+
+	return priv;
+
+free:
+	kfree(priv->pwms);
+	kfree(priv);
+	return ERR_PTR(err);
+}
+
+static void pwmchip_free(struct pwm_chip_private *priv)
+{
+	mutex_lock(&pwm_lock);
+	idr_remove(&pwm_chips, priv->id);
+	mutex_unlock(&pwm_lock);
+
+	kfree(priv->pwms);
+	kfree(priv);
+}
+
 /**
  * __pwmchip_add() - register a new PWM chip
  * @chip: the PWM chip to add
@@ -208,8 +269,7 @@ static bool pwm_ops_check(const struct pwm_chip *chip)
  */
 int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
 {
-	unsigned int i;
-	int ret;
+	struct pwm_chip_private *priv;
 
 	if (!chip || !chip->dev || !chip->ops || !chip->npwm)
 		return -EINVAL;
@@ -217,36 +277,16 @@ int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
 	if (!pwm_ops_check(chip))
 		return -EINVAL;
 
-	chip->owner = owner;
-
-	chip->pwms = kcalloc(chip->npwm, sizeof(*chip->pwms), GFP_KERNEL);
-	if (!chip->pwms)
+	priv = pwmchip_alloc(chip, owner);
+	if (!priv)
 		return -ENOMEM;
 
-	mutex_lock(&pwm_lock);
-
-	ret = idr_alloc(&pwmchip_idr, chip, 0, 0, GFP_KERNEL);
-	if (ret < 0) {
-		mutex_unlock(&pwm_lock);
-		kfree(chip->pwms);
-		return ret;
-	}
-
-	chip->id = ret;
-
-	for (i = 0; i < chip->npwm; i++) {
-		struct pwm_device *pwm = &chip->pwms[i];
-
-		pwm->chip = chip;
-		pwm->hwpwm = i;
-	}
-
-	mutex_unlock(&pwm_lock);
+	chip->priv = priv;
 
 	if (IS_ENABLED(CONFIG_OF))
 		of_pwmchip_add(chip);
 
-	pwmchip_sysfs_export(chip);
+	pwmchip_sysfs_export(priv);
 
 	return 0;
 }
@@ -260,18 +300,14 @@ EXPORT_SYMBOL_GPL(__pwmchip_add);
  */
 void pwmchip_remove(struct pwm_chip *chip)
 {
-	pwmchip_sysfs_unexport(chip);
-
-	if (IS_ENABLED(CONFIG_OF))
-		of_pwmchip_remove(chip);
-
 	mutex_lock(&pwm_lock);
 
-	idr_remove(&pwmchip_idr, chip->id);
+	pwmchip_sysfs_unexport(chip->priv);
 
-	mutex_unlock(&pwm_lock);
+	if (IS_ENABLED(CONFIG_OF))
+		of_pwmchip_remove(chip);
 
-	kfree(chip->pwms);
+	pwmchip_free(chip->priv);
 }
 EXPORT_SYMBOL_GPL(pwmchip_remove);
 
@@ -315,7 +351,7 @@ struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
 		return ERR_PTR(-EINVAL);
 
 	mutex_lock(&pwm_lock);
-	pwm = &chip->pwms[index];
+	pwm = &chip->priv->pwms[index];
 
 	err = pwm_device_request(pwm, label);
 	if (err < 0)
@@ -329,9 +365,9 @@ EXPORT_SYMBOL_GPL(pwm_request_from_chip);
 static void pwm_apply_state_debug(struct pwm_device *pwm,
 				  const struct pwm_state *state)
 {
-	struct pwm_state *last = &pwm->last;
-	struct pwm_chip *chip = pwm->chip;
+	struct pwm_chip *chip = pwm->priv->chip;
 	struct pwm_state s1 = { 0 }, s2 = { 0 };
+	struct pwm_state *last = &pwm->last;
 	int err;
 
 	if (!IS_ENABLED(CONFIG_PWM_DEBUG))
@@ -439,7 +475,6 @@ static void pwm_apply_state_debug(struct pwm_device *pwm,
  */
 int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
 {
-	struct pwm_chip *chip;
 	int err;
 
 	/*
@@ -455,8 +490,6 @@ int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
 	    state->duty_cycle > state->period)
 		return -EINVAL;
 
-	chip = pwm->chip;
-
 	if (state->period == pwm->state.period &&
 	    state->duty_cycle == pwm->state.duty_cycle &&
 	    state->polarity == pwm->state.polarity &&
@@ -464,7 +497,7 @@ int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
 	    state->usage_power == pwm->state.usage_power)
 		return 0;
 
-	err = chip->ops->apply(chip, pwm, state);
+	err = pwm->priv->chip->ops->apply(pwm->priv->chip, pwm, state);
 	trace_pwm_apply(pwm, state, err);
 	if (err)
 		return err;
@@ -492,16 +525,19 @@ EXPORT_SYMBOL_GPL(pwm_apply_state);
 int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result,
 		unsigned long timeout)
 {
+	struct pwm_chip *chip;
 	int err;
 
-	if (!pwm || !pwm->chip->ops)
+	if (!pwm)
 		return -EINVAL;
 
-	if (!pwm->chip->ops->capture)
+	chip = pwm->priv->chip;
+
+	if (!chip || !chip->ops || !chip->ops->capture)
 		return -ENOSYS;
 
 	mutex_lock(&pwm_lock);
-	err = pwm->chip->ops->capture(pwm->chip, pwm, result, timeout);
+	err = chip->ops->capture(chip, pwm, result, timeout);
 	mutex_unlock(&pwm_lock);
 
 	return err;
@@ -566,16 +602,19 @@ EXPORT_SYMBOL_GPL(pwm_adjust_config);
 
 static struct pwm_chip *fwnode_to_pwmchip(struct fwnode_handle *fwnode)
 {
-	struct pwm_chip *chip;
+	struct pwm_chip_private *priv;
 	unsigned long id, tmp;
 
 	mutex_lock(&pwm_lock);
 
-	idr_for_each_entry_ul(&pwmchip_idr, chip, tmp, id)
+	idr_for_each_entry_ul(&pwm_chips, priv, tmp, id) {
+		struct pwm_chip *chip = priv->chip;
+
 		if (chip->dev && device_match_fwnode(chip->dev, fwnode)) {
 			mutex_unlock(&pwm_lock);
 			return chip;
 		}
+	}
 
 	mutex_unlock(&pwm_lock);
 
@@ -585,6 +624,7 @@ static struct pwm_chip *fwnode_to_pwmchip(struct fwnode_handle *fwnode)
 static struct device_link *pwm_device_link_add(struct device *dev,
 					       struct pwm_device *pwm)
 {
+	struct pwm_chip *chip = pwm->priv->chip;
 	struct device_link *dl;
 
 	if (!dev) {
@@ -593,15 +633,15 @@ static struct device_link *pwm_device_link_add(struct device *dev,
 		 * impact the PM sequence ordering: the PWM supplier may get
 		 * suspended before the consumer.
 		 */
-		dev_warn(pwm->chip->dev,
+		dev_warn(chip->dev,
 			 "No consumer device specified to create a link to\n");
 		return NULL;
 	}
 
-	dl = device_link_add(dev, pwm->chip->dev, DL_FLAG_AUTOREMOVE_CONSUMER);
+	dl = device_link_add(dev, chip->dev, DL_FLAG_AUTOREMOVE_CONSUMER);
 	if (!dl) {
 		dev_err(dev, "failed to create device link to %s\n",
-			dev_name(pwm->chip->dev));
+			dev_name(chip->dev));
 		return ERR_PTR(-EINVAL);
 	}
 
@@ -918,12 +958,12 @@ void pwm_put(struct pwm_device *pwm)
 		goto out;
 	}
 
-	if (pwm->chip->ops->free)
-		pwm->chip->ops->free(pwm->chip, pwm);
+	if (pwm->priv->chip->ops->free)
+		pwm->priv->chip->ops->free(pwm->priv->chip, pwm);
 
 	pwm->label = NULL;
 
-	module_put(pwm->chip->owner);
+	module_put(pwm->priv->owner);
 out:
 	mutex_unlock(&pwm_lock);
 }
@@ -997,12 +1037,12 @@ struct pwm_device *devm_fwnode_pwm_get(struct device *dev,
 EXPORT_SYMBOL_GPL(devm_fwnode_pwm_get);
 
 #ifdef CONFIG_DEBUG_FS
-static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s)
+static void pwm_dbg_show(struct pwm_chip_private *priv, struct seq_file *s)
 {
 	unsigned int i;
 
-	for (i = 0; i < chip->npwm; i++) {
-		struct pwm_device *pwm = &chip->pwms[i];
+	for (i = 0; i < priv->chip->npwm; i++) {
+		struct pwm_device *pwm = &priv->pwms[i];
 		struct pwm_state state;
 
 		pwm_get_state(pwm, &state);
@@ -1035,7 +1075,7 @@ static void *pwm_seq_start(struct seq_file *s, loff_t *pos)
 	mutex_lock(&pwm_lock);
 	s->private = "";
 
-	ret = idr_get_next_ul(&pwmchip_idr, &id);
+	ret = idr_get_next_ul(&pwm_chips, &id);
 	*pos = id;
 	return ret;
 }
@@ -1047,7 +1087,7 @@ static void *pwm_seq_next(struct seq_file *s, void *v, loff_t *pos)
 
 	s->private = "\n";
 
-	ret = idr_get_next_ul(&pwmchip_idr, &id);
+	ret = idr_get_next_ul(&pwm_chips, &id);
 	*pos = id;
 	return ret;
 }
@@ -1059,15 +1099,16 @@ static void pwm_seq_stop(struct seq_file *s, void *v)
 
 static int pwm_seq_show(struct seq_file *s, void *v)
 {
-	struct pwm_chip *chip = v;
+	struct pwm_chip_private *priv = v;
+	struct pwm_chip *chip = priv->chip;
 
 	seq_printf(s, "%s%d: %s/%s, %d PWM device%s\n",
-		   (char *)s->private, chip->id,
+		   (char *)s->private, priv->id,
 		   chip->dev->bus ? chip->dev->bus->name : "no-bus",
 		   dev_name(chip->dev), chip->npwm,
 		   (chip->npwm != 1) ? "s" : "");
 
-	pwm_dbg_show(chip, s);
+	pwm_dbg_show(priv, s);
 
 	return 0;
 }
diff --git a/drivers/pwm/internal.h b/drivers/pwm/internal.h
new file mode 100644
index 000000000000..44fffd3b6744
--- /dev/null
+++ b/drivers/pwm/internal.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef PWM_INTERNAL_H
+#define PWM_INTERNAL_H
+
+#include <linux/list.h>
+
+struct pwm_chip;
+struct pwm_device;
+
+/**
+ * struct pwm_chip_private - subsystem-private PWM chip data
+ * @chip: driver-private PWM chip data
+ * @owner: module providing the chip
+ * @pwms: array of PWM devices allocated by the framework
+ * @base: number of first PWM controlled by this chip
+ */
+struct pwm_chip_private {
+	struct pwm_chip *chip;
+	struct module *owner;
+	struct pwm_device *pwms;
+	unsigned int id;
+};
+
+#ifdef CONFIG_PWM_SYSFS
+void pwmchip_sysfs_export(struct pwm_chip_private *priv);
+void pwmchip_sysfs_unexport(struct pwm_chip_private *priv);
+#else
+static inline void pwmchip_sysfs_export(struct pwm_chip_private *priv)
+{
+}
+
+static inline void pwmchip_sysfs_unexport(struct pwm_chip_private *priv)
+{
+}
+#endif /* CONFIG_PWM_SYSFS */
+
+#endif /* PWM_INTERNAL_H */
diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
index 3f2c5031a3ba..6bbbfaa582c1 100644
--- a/drivers/pwm/pwm-atmel-hlcdc.c
+++ b/drivers/pwm/pwm-atmel-hlcdc.c
@@ -15,6 +15,8 @@
 #include <linux/pwm.h>
 #include <linux/regmap.h>
 
+#include "internal.h"
+
 #define ATMEL_HLCDC_PWMCVAL_MASK	GENMASK(15, 8)
 #define ATMEL_HLCDC_PWMCVAL(x)		(((x) << 8) & ATMEL_HLCDC_PWMCVAL_MASK)
 #define ATMEL_HLCDC_PWMPOL		BIT(4)
@@ -185,7 +187,7 @@ static int atmel_hlcdc_pwm_suspend(struct device *dev)
 	struct atmel_hlcdc_pwm *atmel = dev_get_drvdata(dev);
 
 	/* Keep the periph clock enabled if the PWM is still running. */
-	if (pwm_is_enabled(&atmel->chip.pwms[0]))
+	if (pwm_is_enabled(&atmel->chip.priv->pwms[0]))
 		clk_disable_unprepare(atmel->hlcdc->periph_clk);
 
 	return 0;
@@ -197,7 +199,7 @@ static int atmel_hlcdc_pwm_resume(struct device *dev)
 	struct pwm_state state;
 	int ret;
 
-	pwm_get_state(&atmel->chip.pwms[0], &state);
+	pwm_get_state(&atmel->chip.priv->pwms[0], &state);
 
 	/* Re-enable the periph clock it was stopped during suspend. */
 	if (!state.enabled) {
@@ -206,7 +208,7 @@ static int atmel_hlcdc_pwm_resume(struct device *dev)
 			return ret;
 	}
 
-	return atmel_hlcdc_pwm_apply(&atmel->chip, &atmel->chip.pwms[0],
+	return atmel_hlcdc_pwm_apply(&atmel->chip, &atmel->chip.priv->pwms[0],
 				     &state);
 }
 
diff --git a/drivers/pwm/pwm-fsl-ftm.c b/drivers/pwm/pwm-fsl-ftm.c
index d1b6d1aa4773..72467d620a90 100644
--- a/drivers/pwm/pwm-fsl-ftm.c
+++ b/drivers/pwm/pwm-fsl-ftm.c
@@ -19,6 +19,8 @@
 #include <linux/slab.h>
 #include <linux/fsl/ftm.h>
 
+#include "internal.h"
+
 #define FTM_SC_CLK(c)	(((c) + 1) << FTM_SC_CLK_MASK_SHIFT)
 
 enum fsl_pwm_clk {
@@ -468,7 +470,7 @@ static int fsl_pwm_suspend(struct device *dev)
 	regcache_mark_dirty(fpc->regmap);
 
 	for (i = 0; i < fpc->chip.npwm; i++) {
-		struct pwm_device *pwm = &fpc->chip.pwms[i];
+		struct pwm_device *pwm = &fpc->chip.priv->pwms[i];
 
 		if (!test_bit(PWMF_REQUESTED, &pwm->flags))
 			continue;
@@ -491,7 +493,7 @@ static int fsl_pwm_resume(struct device *dev)
 	int i;
 
 	for (i = 0; i < fpc->chip.npwm; i++) {
-		struct pwm_device *pwm = &fpc->chip.pwms[i];
+		struct pwm_device *pwm = &fpc->chip.priv->pwms[i];
 
 		if (!test_bit(PWMF_REQUESTED, &pwm->flags))
 			continue;
diff --git a/drivers/pwm/pwm-lpc18xx-sct.c b/drivers/pwm/pwm-lpc18xx-sct.c
index b3d4a955aa31..80f89ad2bc8f 100644
--- a/drivers/pwm/pwm-lpc18xx-sct.c
+++ b/drivers/pwm/pwm-lpc18xx-sct.c
@@ -27,6 +27,8 @@
 #include <linux/platform_device.h>
 #include <linux/pwm.h>
 
+#include "internal.h"
+
 /* LPC18xx SCT registers */
 #define LPC18XX_PWM_CONFIG		0x000
 #define LPC18XX_PWM_CONFIG_UNIFY	BIT(0)
@@ -224,7 +226,7 @@ static int lpc18xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	    !lpc18xx_pwm->period_ns) {
 		lpc18xx_pwm->period_ns = period_ns;
 		for (i = 0; i < chip->npwm; i++)
-			pwm_set_period(&chip->pwms[i], period_ns);
+			pwm_set_period(&chip->priv->pwms[i], period_ns);
 		lpc18xx_pwm_config_period(chip, period_ns);
 	}
 
diff --git a/drivers/pwm/pwm-lpss.c b/drivers/pwm/pwm-lpss.c
index a6ea3ce7e019..085d3c17f96b 100644
--- a/drivers/pwm/pwm-lpss.c
+++ b/drivers/pwm/pwm-lpss.c
@@ -19,6 +19,8 @@
 #include <linux/pm_runtime.h>
 #include <linux/time.h>
 
+#include "internal.h"
+
 #define DEFAULT_SYMBOL_NAMESPACE PWM_LPSS
 
 #include "pwm-lpss.h"
@@ -73,21 +75,21 @@ static inline struct pwm_lpss_chip *to_lpwm(struct pwm_chip *chip)
 
 static inline u32 pwm_lpss_read(const struct pwm_device *pwm)
 {
-	struct pwm_lpss_chip *lpwm = to_lpwm(pwm->chip);
+	struct pwm_lpss_chip *lpwm = to_lpwm(pwm->priv->chip);
 
 	return readl(lpwm->regs + pwm->hwpwm * PWM_SIZE + PWM);
 }
 
 static inline void pwm_lpss_write(const struct pwm_device *pwm, u32 value)
 {
-	struct pwm_lpss_chip *lpwm = to_lpwm(pwm->chip);
+	struct pwm_lpss_chip *lpwm = to_lpwm(pwm->priv->chip);
 
 	writel(value, lpwm->regs + pwm->hwpwm * PWM_SIZE + PWM);
 }
 
 static int pwm_lpss_wait_for_update(struct pwm_device *pwm)
 {
-	struct pwm_lpss_chip *lpwm = to_lpwm(pwm->chip);
+	struct pwm_lpss_chip *lpwm = to_lpwm(pwm->priv->chip);
 	const void __iomem *addr = lpwm->regs + pwm->hwpwm * PWM_SIZE + PWM;
 	const unsigned int ms = 500 * USEC_PER_MSEC;
 	u32 val;
@@ -106,7 +108,7 @@ static int pwm_lpss_wait_for_update(struct pwm_device *pwm)
 	 */
 	err = readl_poll_timeout(addr, val, !(val & PWM_SW_UPDATE), 40, ms);
 	if (err)
-		dev_err(pwm->chip->dev, "PWM_SW_UPDATE was not cleared\n");
+		dev_err(pwm->priv->chip->dev, "PWM_SW_UPDATE was not cleared\n");
 
 	return err;
 }
@@ -114,7 +116,7 @@ static int pwm_lpss_wait_for_update(struct pwm_device *pwm)
 static inline int pwm_lpss_is_updating(struct pwm_device *pwm)
 {
 	if (pwm_lpss_read(pwm) & PWM_SW_UPDATE) {
-		dev_err(pwm->chip->dev, "PWM_SW_UPDATE is still set, skipping update\n");
+		dev_err(pwm->priv->chip->dev, "PWM_SW_UPDATE is still set, skipping update\n");
 		return -EBUSY;
 	}
 
@@ -278,7 +280,7 @@ struct pwm_lpss_chip *devm_pwm_lpss_probe(struct device *dev, void __iomem *base
 	}
 
 	for (i = 0; i < lpwm->info->npwm; i++) {
-		ctrl = pwm_lpss_read(&lpwm->chip.pwms[i]);
+		ctrl = pwm_lpss_read(&lpwm->chip.priv->pwms[i]);
 		if (ctrl & PWM_ENABLE)
 			pm_runtime_get(dev);
 	}
diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c
index e79b1de8c4d8..d82cca90dba9 100644
--- a/drivers/pwm/pwm-pca9685.c
+++ b/drivers/pwm/pwm-pca9685.c
@@ -22,6 +22,8 @@
 #include <linux/pm_runtime.h>
 #include <linux/bitmap.h>
 
+#include "internal.h"
+
 /*
  * Because the PCA9685 has only one prescaler per chip, only the first channel
  * that is enabled is allowed to change the prescale register.
@@ -134,7 +136,7 @@ static int pca9685_write_reg(struct pca9685 *pca, unsigned int reg, unsigned int
 /* Helper function to set the duty cycle ratio to duty/4096 (e.g. duty=2048 -> 50%) */
 static void pca9685_pwm_set_duty(struct pca9685 *pca, int channel, unsigned int duty)
 {
-	struct pwm_device *pwm = &pca->chip.pwms[channel];
+	struct pwm_device *pwm = &pca->chip.priv->pwms[channel];
 	unsigned int on, off;
 
 	if (duty == 0) {
@@ -173,7 +175,7 @@ static void pca9685_pwm_set_duty(struct pca9685 *pca, int channel, unsigned int
 
 static unsigned int pca9685_pwm_get_duty(struct pca9685 *pca, int channel)
 {
-	struct pwm_device *pwm = &pca->chip.pwms[channel];
+	struct pwm_device *pwm = &pca->chip.priv->pwms[channel];
 	unsigned int off = 0, on = 0, val = 0;
 
 	if (WARN_ON(channel >= PCA9685_MAXCHAN)) {
diff --git a/drivers/pwm/pwm-samsung.c b/drivers/pwm/pwm-samsung.c
index 6e77302f7368..e1baede405bc 100644
--- a/drivers/pwm/pwm-samsung.c
+++ b/drivers/pwm/pwm-samsung.c
@@ -26,6 +26,8 @@
 /* For struct samsung_timer_variant and samsung_pwm_lock. */
 #include <clocksource/samsung_pwm.h>
 
+#include "internal.h"
+
 #define REG_TCFG0			0x00
 #define REG_TCFG1			0x04
 #define REG_TCON			0x08
@@ -627,10 +629,10 @@ static int pwm_samsung_resume(struct device *dev)
 	unsigned int i;
 
 	for (i = 0; i < SAMSUNG_PWM_NUM; i++) {
-		struct pwm_device *pwm = &chip->pwms[i];
+		struct pwm_device *pwm = &chip->priv->pwms[i];
 		struct samsung_pwm_channel *chan = &our_chip->channel[i];
 
-		if (!test_bit(PWMF_REQUESTED, &pwm->flags))
+		if (WARN_ON(!pwm) || !test_bit(PWMF_REQUESTED, &pwm->flags))
 			continue;
 
 		if (our_chip->variant.output_mask & BIT(i))
diff --git a/drivers/pwm/pwm-sifive.c b/drivers/pwm/pwm-sifive.c
index 089e50bdbbf0..e1dccaf33398 100644
--- a/drivers/pwm/pwm-sifive.c
+++ b/drivers/pwm/pwm-sifive.c
@@ -20,6 +20,8 @@
 #include <linux/slab.h>
 #include <linux/bitfield.h>
 
+#include "internal.h"
+
 /* Register offsets */
 #define PWM_SIFIVE_PWMCFG		0x0
 #define PWM_SIFIVE_PWMCOUNT		0x8
@@ -322,7 +324,7 @@ static void pwm_sifive_remove(struct platform_device *dev)
 	clk_notifier_unregister(ddata->clk, &ddata->notifier);
 
 	for (ch = 0; ch < ddata->chip.npwm; ch++) {
-		pwm = &ddata->chip.pwms[ch];
+		pwm = &ddata->chip.priv->pwms[ch];
 		if (pwm->state.enabled)
 			clk_disable(ddata->clk);
 	}
diff --git a/drivers/pwm/pwm-stm32-lp.c b/drivers/pwm/pwm-stm32-lp.c
index 439068f3eca1..cb32caf5368a 100644
--- a/drivers/pwm/pwm-stm32-lp.c
+++ b/drivers/pwm/pwm-stm32-lp.c
@@ -17,6 +17,8 @@
 #include <linux/platform_device.h>
 #include <linux/pwm.h>
 
+#include "internal.h"
+
 struct stm32_pwm_lp {
 	struct pwm_chip chip;
 	struct clk *clk;
@@ -223,10 +225,10 @@ static int stm32_pwm_lp_suspend(struct device *dev)
 	struct stm32_pwm_lp *priv = dev_get_drvdata(dev);
 	struct pwm_state state;
 
-	pwm_get_state(&priv->chip.pwms[0], &state);
+	pwm_get_state(&priv->chip.priv->pwms[0], &state);
 	if (state.enabled) {
 		dev_err(dev, "The consumer didn't stop us (%s)\n",
-			priv->chip.pwms[0].label);
+			priv->chip.priv->pwms[0].label);
 		return -EBUSY;
 	}
 
diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c
index 5f10cba492ec..81933df80768 100644
--- a/drivers/pwm/pwm-stm32.c
+++ b/drivers/pwm/pwm-stm32.c
@@ -16,6 +16,8 @@
 #include <linux/platform_device.h>
 #include <linux/pwm.h>
 
+#include "internal.h"
+
 #define CCMR_CHANNEL_SHIFT 8
 #define CCMR_CHANNEL_MASK  0xFF
 #define MAX_BREAKINPUT 2
@@ -127,7 +129,7 @@ static int stm32_pwm_raw_capture(struct stm32_pwm *priv, struct pwm_device *pwm,
 		*raw_prd = priv->max_arr - priv->capture[0] + priv->capture[2];
 
 	/* Duty cycle capture requires at least two capture units */
-	if (pwm->chip->npwm < 2)
+	if (priv->chip.npwm < 2)
 		*raw_dty = 0;
 	else if (priv->capture[0] <= priv->capture[3])
 		*raw_dty = priv->capture[3] - priv->capture[0];
@@ -682,7 +684,7 @@ static int stm32_pwm_suspend(struct device *dev)
 		mask = TIM_CCER_CC1E << (i * 4);
 		if (ccer & mask) {
 			dev_err(dev, "PWM %u still in use by consumer %s\n",
-				i, priv->chip.pwms[i].label);
+				i, priv->chip.priv->pwms[i].label);
 			return -EBUSY;
 		}
 	}
diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
index d974f4414ac9..f089257051d1 100644
--- a/drivers/pwm/pwm-tiecap.c
+++ b/drivers/pwm/pwm-tiecap.c
@@ -14,6 +14,8 @@
 #include <linux/pwm.h>
 #include <linux/of.h>
 
+#include "internal.h"
+
 /* ECAP registers and bits definitions */
 #define CAP1			0x08
 #define CAP2			0x0C
@@ -288,7 +290,7 @@ static void ecap_pwm_restore_context(struct ecap_pwm_chip *pc)
 static int ecap_pwm_suspend(struct device *dev)
 {
 	struct ecap_pwm_chip *pc = dev_get_drvdata(dev);
-	struct pwm_device *pwm = pc->chip.pwms;
+	struct pwm_device *pwm = pc->chip.priv->pwms;
 
 	ecap_pwm_save_context(pc);
 
@@ -302,7 +304,7 @@ static int ecap_pwm_suspend(struct device *dev)
 static int ecap_pwm_resume(struct device *dev)
 {
 	struct ecap_pwm_chip *pc = dev_get_drvdata(dev);
-	struct pwm_device *pwm = pc->chip.pwms;
+	struct pwm_device *pwm = pc->chip.priv->pwms;
 
 	/* Enable explicitly if PWM was running */
 	if (pwm_is_enabled(pwm))
diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
index af231fa74fa9..0d137100b040 100644
--- a/drivers/pwm/pwm-tiehrpwm.c
+++ b/drivers/pwm/pwm-tiehrpwm.c
@@ -14,6 +14,8 @@
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
 
+#include "internal.h"
+
 /* EHRPWM registers and bits definitions */
 
 /* Time base module registers */
@@ -557,7 +559,7 @@ static int ehrpwm_pwm_suspend(struct device *dev)
 	ehrpwm_pwm_save_context(pc);
 
 	for (i = 0; i < pc->chip.npwm; i++) {
-		struct pwm_device *pwm = &pc->chip.pwms[i];
+		struct pwm_device *pwm = &pc->chip.priv->pwms[i];
 
 		if (!pwm_is_enabled(pwm))
 			continue;
@@ -575,7 +577,7 @@ static int ehrpwm_pwm_resume(struct device *dev)
 	unsigned int i;
 
 	for (i = 0; i < pc->chip.npwm; i++) {
-		struct pwm_device *pwm = &pc->chip.pwms[i];
+		struct pwm_device *pwm = &pc->chip.priv->pwms[i];
 
 		if (!pwm_is_enabled(pwm))
 			continue;
diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
index 4edb994fa2e1..653df20afe1c 100644
--- a/drivers/pwm/sysfs.c
+++ b/drivers/pwm/sysfs.c
@@ -14,6 +14,8 @@
 #include <linux/kdev_t.h>
 #include <linux/pwm.h>
 
+#include "internal.h"
+
 struct pwm_export {
 	struct device child;
 	struct pwm_device *pwm;
@@ -311,7 +313,7 @@ static ssize_t export_store(struct device *parent,
 			    struct device_attribute *attr,
 			    const char *buf, size_t len)
 {
-	struct pwm_chip *chip = dev_get_drvdata(parent);
+	struct pwm_chip_private *priv = dev_get_drvdata(parent);
 	struct pwm_device *pwm;
 	unsigned int hwpwm;
 	int ret;
@@ -320,10 +322,10 @@ static ssize_t export_store(struct device *parent,
 	if (ret < 0)
 		return ret;
 
-	if (hwpwm >= chip->npwm)
+	if (hwpwm >= priv->chip->npwm)
 		return -ENODEV;
 
-	pwm = pwm_request_from_chip(chip, hwpwm, "sysfs");
+	pwm = pwm_request_from_chip(priv->chip, hwpwm, "sysfs");
 	if (IS_ERR(pwm))
 		return PTR_ERR(pwm);
 
@@ -339,7 +341,7 @@ static ssize_t unexport_store(struct device *parent,
 			      struct device_attribute *attr,
 			      const char *buf, size_t len)
 {
-	struct pwm_chip *chip = dev_get_drvdata(parent);
+	struct pwm_chip_private *priv = dev_get_drvdata(parent);
 	unsigned int hwpwm;
 	int ret;
 
@@ -347,10 +349,10 @@ static ssize_t unexport_store(struct device *parent,
 	if (ret < 0)
 		return ret;
 
-	if (hwpwm >= chip->npwm)
+	if (hwpwm >= priv->chip->npwm)
 		return -ENODEV;
 
-	ret = pwm_unexport_child(parent, &chip->pwms[hwpwm]);
+	ret = pwm_unexport_child(parent, &priv->pwms[hwpwm]);
 
 	return ret ? : len;
 }
@@ -359,9 +361,9 @@ static DEVICE_ATTR_WO(unexport);
 static ssize_t npwm_show(struct device *parent, struct device_attribute *attr,
 			 char *buf)
 {
-	const struct pwm_chip *chip = dev_get_drvdata(parent);
+	const struct pwm_chip_private *priv = dev_get_drvdata(parent);
 
-	return sysfs_emit(buf, "%u\n", chip->npwm);
+	return sysfs_emit(buf, "%u\n", priv->chip->npwm);
 }
 static DEVICE_ATTR_RO(npwm);
 
@@ -411,12 +413,12 @@ static int pwm_class_apply_state(struct pwm_export *export,
 
 static int pwm_class_resume_npwm(struct device *parent, unsigned int npwm)
 {
-	struct pwm_chip *chip = dev_get_drvdata(parent);
+	struct pwm_chip_private *priv = dev_get_drvdata(parent);
 	unsigned int i;
 	int ret = 0;
 
 	for (i = 0; i < npwm; i++) {
-		struct pwm_device *pwm = &chip->pwms[i];
+		struct pwm_device *pwm = &priv->pwms[i];
 		struct pwm_state state;
 		struct pwm_export *export;
 
@@ -442,12 +444,12 @@ static int pwm_class_resume_npwm(struct device *parent, unsigned int npwm)
 
 static int pwm_class_suspend(struct device *parent)
 {
-	struct pwm_chip *chip = dev_get_drvdata(parent);
+	struct pwm_chip_private *priv = dev_get_drvdata(parent);
 	unsigned int i;
 	int ret = 0;
 
-	for (i = 0; i < chip->npwm; i++) {
-		struct pwm_device *pwm = &chip->pwms[i];
+	for (i = 0; i < priv->chip->npwm; i++) {
+		struct pwm_device *pwm = &priv->pwms[i];
 		struct pwm_state state;
 		struct pwm_export *export;
 
@@ -483,9 +485,9 @@ static int pwm_class_suspend(struct device *parent)
 
 static int pwm_class_resume(struct device *parent)
 {
-	struct pwm_chip *chip = dev_get_drvdata(parent);
+	struct pwm_chip_private *priv = dev_get_drvdata(parent);
 
-	return pwm_class_resume_npwm(parent, chip->npwm);
+	return pwm_class_resume_npwm(parent, priv->chip->npwm);
 }
 
 static DEFINE_SIMPLE_DEV_PM_OPS(pwm_class_pm_ops, pwm_class_suspend, pwm_class_resume);
@@ -501,7 +503,7 @@ static int pwmchip_sysfs_match(struct device *parent, const void *data)
 	return dev_get_drvdata(parent) == data;
 }
 
-void pwmchip_sysfs_export(struct pwm_chip *chip)
+void pwmchip_sysfs_export(struct pwm_chip_private *priv)
 {
 	struct device *parent;
 
@@ -509,26 +511,26 @@ void pwmchip_sysfs_export(struct pwm_chip *chip)
 	 * If device_create() fails the pwm_chip is still usable by
 	 * the kernel it's just not exported.
 	 */
-	parent = device_create(&pwm_class, chip->dev, MKDEV(0, 0), chip,
-			       "pwmchip%d", chip->id);
+	parent = device_create(&pwm_class, priv->chip->dev, MKDEV(0, 0), priv,
+			       "pwmchip%d", priv->id);
 	if (IS_ERR(parent)) {
-		dev_warn(chip->dev,
+		dev_warn(priv->chip->dev,
 			 "device_create failed for pwm_chip sysfs export\n");
 	}
 }
 
-void pwmchip_sysfs_unexport(struct pwm_chip *chip)
+void pwmchip_sysfs_unexport(struct pwm_chip_private *priv)
 {
 	struct device *parent;
 	unsigned int i;
 
-	parent = class_find_device(&pwm_class, NULL, chip,
+	parent = class_find_device(&pwm_class, NULL, priv,
 				   pwmchip_sysfs_match);
 	if (!parent)
 		return;
 
-	for (i = 0; i < chip->npwm; i++) {
-		struct pwm_device *pwm = &chip->pwms[i];
+	for (i = 0; i < priv->chip->npwm; i++) {
+		struct pwm_device *pwm = &priv->pwms[i];
 
 		if (test_bit(PWMF_EXPORTED, &pwm->flags))
 			pwm_unexport_child(parent, pwm);
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index f87655c06c82..5c478cd592d7 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -6,6 +6,7 @@
 #include <linux/mutex.h>
 #include <linux/of.h>
 
+struct pwm_chip_private;
 struct pwm_chip;
 
 /**
@@ -79,11 +80,12 @@ struct pwm_device {
 	const char *label;
 	unsigned long flags;
 	unsigned int hwpwm;
-	struct pwm_chip *chip;
 
 	struct pwm_args args;
 	struct pwm_state state;
 	struct pwm_state last;
+
+	struct pwm_chip_private *priv;
 };
 
 /**
@@ -280,26 +282,21 @@ struct pwm_ops {
  * struct pwm_chip - abstract a PWM controller
  * @dev: device providing the PWMs
  * @ops: callbacks for this PWM controller
- * @owner: module providing this chip
- * @id: unique number of this PWM chip
  * @npwm: number of PWMs controlled by this chip
  * @of_xlate: request a PWM device given a device tree PWM specifier
  * @of_pwm_n_cells: number of cells expected in the device tree PWM specifier
- * @pwms: array of PWM devices allocated by the framework
+ * @priv: subsystem internal chip data
  */
 struct pwm_chip {
 	struct device *dev;
 	const struct pwm_ops *ops;
-	struct module *owner;
-	unsigned int id;
 	unsigned int npwm;
 
 	struct pwm_device * (*of_xlate)(struct pwm_chip *chip,
 					const struct of_phandle_args *args);
 	unsigned int of_pwm_n_cells;
 
-	/* only used internally by the PWM framework */
-	struct pwm_device *pwms;
+	struct pwm_chip_private *priv;
 };
 
 #if IS_ENABLED(CONFIG_PWM)
@@ -564,17 +561,4 @@ static inline void pwm_remove_table(struct pwm_lookup *table, size_t num)
 }
 #endif
 
-#ifdef CONFIG_PWM_SYSFS
-void pwmchip_sysfs_export(struct pwm_chip *chip);
-void pwmchip_sysfs_unexport(struct pwm_chip *chip);
-#else
-static inline void pwmchip_sysfs_export(struct pwm_chip *chip)
-{
-}
-
-static inline void pwmchip_sysfs_unexport(struct pwm_chip *chip)
-{
-}
-#endif /* CONFIG_PWM_SYSFS */
-
 #endif /* __LINUX_PWM_H */
-- 
2.43.0


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Re: [PATCH v4 000/115] pwm: Fix lifetime issues for pwm_chips

[Uwe Kleine-König]

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Hello Thierry,

On Fri, Dec 08, 2023 at 04:41:39PM +0100, Thierry Reding wrote:
> On Wed, Dec 06, 2023 at 12:43:14PM +0100, Uwe Kleine-König wrote:
> > This series is based on Thierry's for-next.
> > 
> > It starts with some cleanups that were all sent out separately already:
> > 
> >  - "pwm: Reduce number of pointer dereferences in pwm_device_request()"
> >    https://lore.kernel.org/linux-pwm/20231130072105.966848-1-u.kleine-koenig@pengutronix.de
> >  - "pwm: crc: Use consistent variable naming for driver data"
> >    https://lore.kernel.org/linux-pwm/20231130074133.969806-1-u.kleine-koenig@pengutronix.de
> >  - Two leds/qcom-lpg patches
> >    https://lore.kernel.org/linux-leds/20231126095230.683204-1-u.kleine-koenig@pengutronix.de
> >    Lee already claimed to have taken the series already, but it's not yet in
> >    next.
> >  - "leds: qcom-lpg: Introduce a wrapper for getting driver data from a pwm chip"
> >    https://lore.kernel.org/linux-leds/20231124215208.616551-3-u.kleine-koenig@pengutronix.de
> > 
> > In the following patches I changed:
> > 
> >  - "pwm: cros-ec: Change prototype of helper to prepare further changes" +
> >    This was simplified in response to feedback by Tzung-Bi Shih
> >  - Make pwmchip_priv() static (and don't export it), let drivers use a new
> >    pwmchip_get_drvdata() instead.
> >  - For drm/ti-sn65dsi86.c and leds/qcom-lpg make use of
> >    pwmchip_set_drvdata() which makes the conversion to
> >    devm_pwmchip_alloc() much prettier.
> >  - Some cleanups here and there
> >  - Add review tags received in v3
> >    I kept all tags even though the pwmchip_alloc() patches changed
> >    slightly. Most of the time that's only
> >    s/pwmchip_priv/pwmchip_get_drvdata/ though. Still, if you object,
> >    just tell me. (This affects Paul Cercueil on patch #68, Conor Dooley
> >    on patch #76 and Greg for patch #109.)
> > 
> > I kept the pwmchip_alloc() + pwmchip_register() approach despite Bart
> > not liking it. To balance that out I don't like Bart's alternative
> > approach. There are no technically relevant differences between the two
> > approaches and no benchmarks that show either of the two to be better
> > than the other. Conceptually the design ideas around pwmchip_alloc() +
> > pwmchip_register() are used in several other subsystems, so it's a
> > proven way to do things.
> 
> [Trimming the recipients, keeping only Bart and the mailing lists.]
> 
> I do think there are technically relevant differences. For one, the
> better we isolate the internal data structure, the easier this becomes
> to manage. I'm attaching a patch that I've prototyped which should
> basically get us to somewhere around patch 110 of this series but with
> something like 1/8th of the changes. It doesn't need every driver to
> change and (mostly) decouples driver code from the core code.

You don't need to touch all drivers because you didn't change struct
pwm_chip::dev yet. (If you really want, you don't need to change that,
but then you have some duplication as chip->dev holds the same value as
priv->dev.parent in the end.)

> Now, I know that you think this is all bad because it's not a single
> allocation, but I much prefer the end result because it's got the driver
> and internals much more cleanly separated. Going forward I think it
> would be easier to apply all the ref-counting on top of that because we
> only need to keep the PWM framework-internal data structure alive after
> a PWM chip has gone away.

Nearly all drivers need driver private data. Isn't it a nice service by
the pwm core to make handling this private data easier for the lowlevel
drivers?

> From 72ea79887d96850f9ccc832ce52b907ca276c940 Mon Sep 17 00:00:00 2001
> From: Thierry Reding <thierry.reding@gmail.com>
> Date: Tue, 28 Nov 2023 15:42:39 +0100
> Subject: [PATCH] pwm: Isolate internal data into a separate structure
> 
> In order to prepare for proper reference counting of PWM chips and PWM
> devices, move the internal data from the public PWM chip to a private
> PWM chip structure. This ensures that the data that the subsystem core
> may need to reference later on can stick around beyond the lifetime of
> the driver-private data.
> 
> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
> ---
>  drivers/pwm/core.c            | 185 +++++++++++++++++++++-------------
>  drivers/pwm/internal.h        |  38 +++++++
>  drivers/pwm/pwm-atmel-hlcdc.c |   8 +-
>  drivers/pwm/pwm-fsl-ftm.c     |   6 +-
>  drivers/pwm/pwm-lpc18xx-sct.c |   4 +-
>  drivers/pwm/pwm-lpss.c        |  14 +--
>  drivers/pwm/pwm-pca9685.c     |   6 +-
>  drivers/pwm/pwm-samsung.c     |   6 +-
>  drivers/pwm/pwm-sifive.c      |   4 +-
>  drivers/pwm/pwm-stm32-lp.c    |   6 +-
>  drivers/pwm/pwm-stm32.c       |   6 +-
>  drivers/pwm/pwm-tiecap.c      |   6 +-
>  drivers/pwm/pwm-tiehrpwm.c    |   6 +-
>  drivers/pwm/sysfs.c           |  48 ++++-----
>  include/linux/pwm.h           |  26 +----
>  15 files changed, 228 insertions(+), 141 deletions(-)
>  create mode 100644 drivers/pwm/internal.h
> 
> diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
> index f60b715abe62..54d57dec6dce 100644
> --- a/drivers/pwm/core.c
> +++ b/drivers/pwm/core.c
> @@ -24,17 +24,19 @@
>  #define CREATE_TRACE_POINTS
>  #include <trace/events/pwm.h>
>  
> +#include "internal.h"
> +
>  static DEFINE_MUTEX(pwm_lookup_lock);
>  static LIST_HEAD(pwm_lookup_list);
>  
> -/* protects access to pwmchip_idr */
> +/* protects access to pwm_chips */
>  static DEFINE_MUTEX(pwm_lock);
>  
> -static DEFINE_IDR(pwmchip_idr);
> +static DEFINE_IDR(pwm_chips);

That's an unrelated change.

>  static struct pwm_chip *pwmchip_find_by_name(const char *name)
>  {
> -	struct pwm_chip *chip;
> +	struct pwm_chip_private *priv;
>  	unsigned long id, tmp;
>  
>  	if (!name)
> @@ -42,12 +44,12 @@ static struct pwm_chip *pwmchip_find_by_name(const char *name)
>  
>  	mutex_lock(&pwm_lock);
>  
> -	idr_for_each_entry_ul(&pwmchip_idr, chip, tmp, id) {
> -		const char *chip_name = dev_name(chip->dev);
> +	idr_for_each_entry_ul(&pwm_chips, priv, tmp, id) {
> +		const char *chip_name = dev_name(priv->chip->dev);

two pointer dereferences instead of one before.

>  		if (chip_name && strcmp(chip_name, name) == 0) {
>  			mutex_unlock(&pwm_lock);
> -			return chip;
> +			return priv->chip;

one pointer reference instead of none before.

>  		}
>  	}
>  
> @@ -58,23 +60,24 @@ static struct pwm_chip *pwmchip_find_by_name(const char *name)
>  
>  static int pwm_device_request(struct pwm_device *pwm, const char *label)
>  {
> +	struct pwm_chip *chip = pwm->priv->chip;

With my approach getting the chip of a struct pwm_device is only one
pointer dereference away. You need two.

>  	int err;
>  
>  	if (test_bit(PWMF_REQUESTED, &pwm->flags))
>  		return -EBUSY;
>  
> -	if (!try_module_get(pwm->chip->owner))
> +	if (!try_module_get(pwm->priv->owner))
>  		return -ENODEV;
>  
> -	if (pwm->chip->ops->request) {
> -		err = pwm->chip->ops->request(pwm->chip, pwm);
> +	if (chip->ops->request) {
> +		err = chip->ops->request(chip, pwm);

You seem to have reimplemented half of
https://lore.kernel.org/linux-pwm/20231130072105.966848-1-u.kleine-koenig@pengutronix.de
here.

>  		if (err) {
> -			module_put(pwm->chip->owner);
> +			module_put(pwm->priv->owner);
>  			return err;
>  		}
>  	}
>  
> -	if (pwm->chip->ops->get_state) {
> +	if (chip->ops->get_state) {
>  		/*
>  		 * Zero-initialize state because most drivers are unaware of
>  		 * .usage_power. The other members of state are supposed to be
> @@ -84,7 +87,7 @@ static int pwm_device_request(struct pwm_device *pwm, const char *label)
>  		 */
>  		struct pwm_state state = { 0, };
>  
> -		err = pwm->chip->ops->get_state(pwm->chip, pwm, &state);
> +		err = chip->ops->get_state(chip, pwm, &state);
>  		trace_pwm_get(pwm, &state, err);
>  
>  		if (!err)
> @@ -196,6 +199,64 @@ static bool pwm_ops_check(const struct pwm_chip *chip)
>  	return true;
>  }
>  
> +static struct pwm_chip_private *pwmchip_alloc(struct pwm_chip *chip,
> +					      struct module *owner)
> +{
> +	struct pwm_chip_private *priv;
> +	struct pwm_device *pwm;
> +	unsigned int i;
> +	int err;
> +
> +	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return ERR_PTR(-ENOMEM);
> +
> +	priv->pwms = kcalloc(chip->npwm, sizeof(*pwm), GFP_KERNEL);
> +	if (!priv->pwms) {
> +		err = -ENOMEM;
> +		goto free;
> +	}

Oh, so you don't use one additional allocation but two.

> +	priv->owner = owner;
> +	priv->chip = chip;
> +
> +	for (i = 0; i < chip->npwm; i++) {
> +		struct pwm_device *pwm = &priv->pwms[i];
> +
> +		pwm->priv = priv;
> +		pwm->hwpwm = i;
> +	}
> +
> +	mutex_lock(&pwm_lock);
> +
> +	err = idr_alloc(&pwm_chips, priv, 0, 0, GFP_KERNEL);
> +	if (err < 0) {
> +		mutex_unlock(&pwm_lock);
> +		goto free;
> +	}
> +
> +	mutex_unlock(&pwm_lock);
> +
> +	priv->id = err;
> +
> +	return priv;
> +
> +free:
> +	kfree(priv->pwms);
> +	kfree(priv);
> +	return ERR_PTR(err);
> +}
> +
> +static void pwmchip_free(struct pwm_chip_private *priv)
> +{
> +	mutex_lock(&pwm_lock);
> +	idr_remove(&pwm_chips, priv->id);
> +	mutex_unlock(&pwm_lock);
> +
> +	kfree(priv->pwms);
> +	kfree(priv);
> +}
> +
>  /**
>   * __pwmchip_add() - register a new PWM chip
>   * @chip: the PWM chip to add
> @@ -208,8 +269,7 @@ static bool pwm_ops_check(const struct pwm_chip *chip)
>   */
>  int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
>  {
> -	unsigned int i;
> -	int ret;
> +	struct pwm_chip_private *priv;
>  
>  	if (!chip || !chip->dev || !chip->ops || !chip->npwm)
>  		return -EINVAL;
> @@ -217,36 +277,16 @@ int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
>  	if (!pwm_ops_check(chip))
>  		return -EINVAL;
>  
> -	chip->owner = owner;
> -
> -	chip->pwms = kcalloc(chip->npwm, sizeof(*chip->pwms), GFP_KERNEL);
> -	if (!chip->pwms)
> +	priv = pwmchip_alloc(chip, owner);
> +	if (!priv)
>  		return -ENOMEM;
>  
> -	mutex_lock(&pwm_lock);
> -
> -	ret = idr_alloc(&pwmchip_idr, chip, 0, 0, GFP_KERNEL);
> -	if (ret < 0) {
> -		mutex_unlock(&pwm_lock);
> -		kfree(chip->pwms);
> -		return ret;
> -	}
> -
> -	chip->id = ret;
> -
> -	for (i = 0; i < chip->npwm; i++) {
> -		struct pwm_device *pwm = &chip->pwms[i];
> -
> -		pwm->chip = chip;
> -		pwm->hwpwm = i;
> -	}
> -
> -	mutex_unlock(&pwm_lock);
> +	chip->priv = priv;
>  
>  	if (IS_ENABLED(CONFIG_OF))
>  		of_pwmchip_add(chip);
>  
> -	pwmchip_sysfs_export(chip);
> +	pwmchip_sysfs_export(priv);
>  
>  	return 0;
>  }
> @@ -260,18 +300,14 @@ EXPORT_SYMBOL_GPL(__pwmchip_add);
>   */
>  void pwmchip_remove(struct pwm_chip *chip)
>  {
> -	pwmchip_sysfs_unexport(chip);
> -
> -	if (IS_ENABLED(CONFIG_OF))
> -		of_pwmchip_remove(chip);
> -
>  	mutex_lock(&pwm_lock);
>  
> -	idr_remove(&pwmchip_idr, chip->id);
> +	pwmchip_sysfs_unexport(chip->priv);
>  
> -	mutex_unlock(&pwm_lock);
> +	if (IS_ENABLED(CONFIG_OF))
> +		of_pwmchip_remove(chip);
>  
> -	kfree(chip->pwms);
> +	pwmchip_free(chip->priv);
>  }
>  EXPORT_SYMBOL_GPL(pwmchip_remove);
>  
> @@ -315,7 +351,7 @@ struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
>  		return ERR_PTR(-EINVAL);
>  
>  	mutex_lock(&pwm_lock);
> -	pwm = &chip->pwms[index];
> +	pwm = &chip->priv->pwms[index];

two pointer dereferences instead of one before.

>  	err = pwm_device_request(pwm, label);
>  	if (err < 0)
> @@ -329,9 +365,9 @@ EXPORT_SYMBOL_GPL(pwm_request_from_chip);
>  static void pwm_apply_state_debug(struct pwm_device *pwm,
>  				  const struct pwm_state *state)
>  {
> -	struct pwm_state *last = &pwm->last;
> -	struct pwm_chip *chip = pwm->chip;
> +	struct pwm_chip *chip = pwm->priv->chip;
>  	struct pwm_state s1 = { 0 }, s2 = { 0 };
> +	struct pwm_state *last = &pwm->last;
>  	int err;
>  
>  	if (!IS_ENABLED(CONFIG_PWM_DEBUG))
> @@ -439,7 +475,6 @@ static void pwm_apply_state_debug(struct pwm_device *pwm,
>   */
>  int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
>  {
> -	struct pwm_chip *chip;
>  	int err;
>  
>  	/*
> @@ -455,8 +490,6 @@ int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
>  	    state->duty_cycle > state->period)
>  		return -EINVAL;
>  
> -	chip = pwm->chip;
> -
>  	if (state->period == pwm->state.period &&
>  	    state->duty_cycle == pwm->state.duty_cycle &&
>  	    state->polarity == pwm->state.polarity &&
> @@ -464,7 +497,7 @@ int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
>  	    state->usage_power == pwm->state.usage_power)
>  		return 0;
>  
> -	err = chip->ops->apply(chip, pwm, state);
> +	err = pwm->priv->chip->ops->apply(pwm->priv->chip, pwm, state);

four pointer dereferences instead of two before.

>  	trace_pwm_apply(pwm, state, err);
>  	if (err)
>  		return err;
> @@ -492,16 +525,19 @@ EXPORT_SYMBOL_GPL(pwm_apply_state);
>  int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result,
>  		unsigned long timeout)
>  {
> +	struct pwm_chip *chip;
>  	int err;
>  
> -	if (!pwm || !pwm->chip->ops)
> +	if (!pwm)
>  		return -EINVAL;
>  
> -	if (!pwm->chip->ops->capture)
> +	chip = pwm->priv->chip;

One pointer deference more than before (assuming sensible compilation).

> +	if (!chip || !chip->ops || !chip->ops->capture)
>  		return -ENOSYS;

Changing the return code for !chip->ops isn't intended, is it?

>  	mutex_lock(&pwm_lock);
> -	err = pwm->chip->ops->capture(pwm->chip, pwm, result, timeout);
> +	err = chip->ops->capture(chip, pwm, result, timeout);
>  	mutex_unlock(&pwm_lock);
>  
>  	return err;
> @@ -566,16 +602,19 @@ EXPORT_SYMBOL_GPL(pwm_adjust_config);
>  
>  static struct pwm_chip *fwnode_to_pwmchip(struct fwnode_handle *fwnode)
>  {
> -	struct pwm_chip *chip;
> +	struct pwm_chip_private *priv;
>  	unsigned long id, tmp;
>  
>  	mutex_lock(&pwm_lock);
>  
> -	idr_for_each_entry_ul(&pwmchip_idr, chip, tmp, id)
> +	idr_for_each_entry_ul(&pwm_chips, priv, tmp, id) {
> +		struct pwm_chip *chip = priv->chip;
> +

One pointer dereference more per iteration than before.

>  		if (chip->dev && device_match_fwnode(chip->dev, fwnode)) {
>  			mutex_unlock(&pwm_lock);
>  			return chip;
>  		}
> +	}
>  
>  	mutex_unlock(&pwm_lock);
>  
> @@ -585,6 +624,7 @@ static struct pwm_chip *fwnode_to_pwmchip(struct fwnode_handle *fwnode)
>  static struct device_link *pwm_device_link_add(struct device *dev,
>  					       struct pwm_device *pwm)
>  {
> +	struct pwm_chip *chip = pwm->priv->chip;
>  	struct device_link *dl;
>  
>  	if (!dev) {
> @@ -593,15 +633,15 @@ static struct device_link *pwm_device_link_add(struct device *dev,
>  		 * impact the PM sequence ordering: the PWM supplier may get
>  		 * suspended before the consumer.
>  		 */
> -		dev_warn(pwm->chip->dev,
> +		dev_warn(chip->dev,

One pointer deference more than before (assuming sensible compilation).

>  			 "No consumer device specified to create a link to\n");
>  		return NULL;
>  	}
>  
> -	dl = device_link_add(dev, pwm->chip->dev, DL_FLAG_AUTOREMOVE_CONSUMER);
> +	dl = device_link_add(dev, chip->dev, DL_FLAG_AUTOREMOVE_CONSUMER);
>  	if (!dl) {
>  		dev_err(dev, "failed to create device link to %s\n",
> -			dev_name(pwm->chip->dev));
> +			dev_name(chip->dev));
>  		return ERR_PTR(-EINVAL);
>  	}
>  
> @@ -918,12 +958,12 @@ void pwm_put(struct pwm_device *pwm)
>  		goto out;
>  	}
>  
> -	if (pwm->chip->ops->free)
> -		pwm->chip->ops->free(pwm->chip, pwm);
> +	if (pwm->priv->chip->ops->free)
> +		pwm->priv->chip->ops->free(pwm->priv->chip, pwm);

One pointer deference more than before (assuming sensible compilation).

>  	pwm->label = NULL;
>  
> -	module_put(pwm->chip->owner);
> +	module_put(pwm->priv->owner);
>  out:
>  	mutex_unlock(&pwm_lock);
>  }
> @@ -997,12 +1037,12 @@ struct pwm_device *devm_fwnode_pwm_get(struct device *dev,
>  EXPORT_SYMBOL_GPL(devm_fwnode_pwm_get);
>  
>  #ifdef CONFIG_DEBUG_FS
> -static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s)
> +static void pwm_dbg_show(struct pwm_chip_private *priv, struct seq_file *s)
>  {
>  	unsigned int i;
>  
> -	for (i = 0; i < chip->npwm; i++) {
> -		struct pwm_device *pwm = &chip->pwms[i];
> +	for (i = 0; i < priv->chip->npwm; i++) {
> +		struct pwm_device *pwm = &priv->pwms[i];
>  		struct pwm_state state;
>  
>  		pwm_get_state(pwm, &state);
> @@ -1035,7 +1075,7 @@ static void *pwm_seq_start(struct seq_file *s, loff_t *pos)
>  	mutex_lock(&pwm_lock);
>  	s->private = "";
>  
> -	ret = idr_get_next_ul(&pwmchip_idr, &id);
> +	ret = idr_get_next_ul(&pwm_chips, &id);
>  	*pos = id;
>  	return ret;
>  }
> @@ -1047,7 +1087,7 @@ static void *pwm_seq_next(struct seq_file *s, void *v, loff_t *pos)
>  
>  	s->private = "\n";
>  
> -	ret = idr_get_next_ul(&pwmchip_idr, &id);
> +	ret = idr_get_next_ul(&pwm_chips, &id);
>  	*pos = id;
>  	return ret;
>  }
> @@ -1059,15 +1099,16 @@ static void pwm_seq_stop(struct seq_file *s, void *v)
>  
>  static int pwm_seq_show(struct seq_file *s, void *v)
>  {
> -	struct pwm_chip *chip = v;
> +	struct pwm_chip_private *priv = v;
> +	struct pwm_chip *chip = priv->chip;

And another additional pointer dereference.

>  	seq_printf(s, "%s%d: %s/%s, %d PWM device%s\n",
> -		   (char *)s->private, chip->id,
> +		   (char *)s->private, priv->id,
>  		   chip->dev->bus ? chip->dev->bus->name : "no-bus",
>  		   dev_name(chip->dev), chip->npwm,
>  		   (chip->npwm != 1) ? "s" : "");
>  
> -	pwm_dbg_show(chip, s);
> +	pwm_dbg_show(priv, s);
>  
>  	return 0;
>  }
> diff --git a/drivers/pwm/internal.h b/drivers/pwm/internal.h
> new file mode 100644
> index 000000000000..44fffd3b6744
> --- /dev/null
> +++ b/drivers/pwm/internal.h
> @@ -0,0 +1,38 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +#ifndef PWM_INTERNAL_H
> +#define PWM_INTERNAL_H
> +
> +#include <linux/list.h>

This is unused?

> +struct pwm_chip;
> +struct pwm_device;
> +
> +/**
> + * struct pwm_chip_private - subsystem-private PWM chip data
> + * @chip: driver-private PWM chip data
> + * @owner: module providing the chip
> + * @pwms: array of PWM devices allocated by the framework
> + * @base: number of first PWM controlled by this chip
> + */
> +struct pwm_chip_private {
> +	struct pwm_chip *chip;
> +	struct module *owner;
> +	struct pwm_device *pwms;
> +	unsigned int id;
> +};

With my approach the struct pwm_chip * pointer isn't needed because it's
all in one structure. So you have two structures where I only have one
and your two are bigger in sum than my single one (not counting memory
management overhead and alignment).

> +#ifdef CONFIG_PWM_SYSFS
> +void pwmchip_sysfs_export(struct pwm_chip_private *priv);
> +void pwmchip_sysfs_unexport(struct pwm_chip_private *priv);
> +#else
> +static inline void pwmchip_sysfs_export(struct pwm_chip_private *priv)
> +{
> +}
> +
> +static inline void pwmchip_sysfs_unexport(struct pwm_chip_private *priv)
> +{
> +}
> +#endif /* CONFIG_PWM_SYSFS */
> +
> +#endif /* PWM_INTERNAL_H */
> diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
> index 3f2c5031a3ba..6bbbfaa582c1 100644
> --- a/drivers/pwm/pwm-atmel-hlcdc.c
> +++ b/drivers/pwm/pwm-atmel-hlcdc.c
> @@ -15,6 +15,8 @@
>  #include <linux/pwm.h>
>  #include <linux/regmap.h>
>  
> +#include "internal.h"
> +
>  #define ATMEL_HLCDC_PWMCVAL_MASK	GENMASK(15, 8)
>  #define ATMEL_HLCDC_PWMCVAL(x)		(((x) << 8) & ATMEL_HLCDC_PWMCVAL_MASK)
>  #define ATMEL_HLCDC_PWMPOL		BIT(4)
> @@ -185,7 +187,7 @@ static int atmel_hlcdc_pwm_suspend(struct device *dev)
>  	struct atmel_hlcdc_pwm *atmel = dev_get_drvdata(dev);
>  
>  	/* Keep the periph clock enabled if the PWM is still running. */
> -	if (pwm_is_enabled(&atmel->chip.pwms[0]))
> +	if (pwm_is_enabled(&atmel->chip.priv->pwms[0]))

Didn't work so well to hide the internals of pwm_chip_private from the
drivers?

>  		clk_disable_unprepare(atmel->hlcdc->periph_clk);
>  
>  	return 0;
>  

[... a few more drivers where hiding the internals failed ...]

> diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
> index 4edb994fa2e1..653df20afe1c 100644
> --- a/drivers/pwm/sysfs.c
> +++ b/drivers/pwm/sysfs.c
> @@ -14,6 +14,8 @@
>  #include <linux/kdev_t.h>
>  #include <linux/pwm.h>
>  
> +#include "internal.h"
> +
>  struct pwm_export {
>  	struct device child;
>  	struct pwm_device *pwm;
> @@ -311,7 +313,7 @@ static ssize_t export_store(struct device *parent,
>  			    struct device_attribute *attr,
>  			    const char *buf, size_t len)
>  {
> -	struct pwm_chip *chip = dev_get_drvdata(parent);
> +	struct pwm_chip_private *priv = dev_get_drvdata(parent);
>  	struct pwm_device *pwm;
>  	unsigned int hwpwm;
>  	int ret;
> @@ -320,10 +322,10 @@ static ssize_t export_store(struct device *parent,
>  	if (ret < 0)
>  		return ret;
>  
> -	if (hwpwm >= chip->npwm)
> +	if (hwpwm >= priv->chip->npwm)

One more pointer dereference than before. You could trade that for some
data duplication by copying npwm to struct pwmchip_priv for the case
when you need .npwm but the chip is already gone.

>  		return -ENODEV;
>  
> -	pwm = pwm_request_from_chip(chip, hwpwm, "sysfs");
> +	pwm = pwm_request_from_chip(priv->chip, hwpwm, "sysfs");
>  	if (IS_ERR(pwm))
>  		return PTR_ERR(pwm);
>  
> @@ -339,7 +341,7 @@ static ssize_t unexport_store(struct device *parent,
>  			      struct device_attribute *attr,
>  			      const char *buf, size_t len)
>  {
> -	struct pwm_chip *chip = dev_get_drvdata(parent);
> +	struct pwm_chip_private *priv = dev_get_drvdata(parent);
>  	unsigned int hwpwm;
>  	int ret;
>  
> @@ -347,10 +349,10 @@ static ssize_t unexport_store(struct device *parent,
>  	if (ret < 0)
>  		return ret;
>  
> -	if (hwpwm >= chip->npwm)
> +	if (hwpwm >= priv->chip->npwm)

One more pointer dereference than before.

>  		return -ENODEV;
>  
> -	ret = pwm_unexport_child(parent, &chip->pwms[hwpwm]);
> +	ret = pwm_unexport_child(parent, &priv->pwms[hwpwm]);
>  
>  	return ret ? : len;
>  }
> @@ -359,9 +361,9 @@ static DEVICE_ATTR_WO(unexport);
>  static ssize_t npwm_show(struct device *parent, struct device_attribute *attr,
>  			 char *buf)
>  {
> -	const struct pwm_chip *chip = dev_get_drvdata(parent);
> +	const struct pwm_chip_private *priv = dev_get_drvdata(parent);
>  
> -	return sysfs_emit(buf, "%u\n", chip->npwm);
> +	return sysfs_emit(buf, "%u\n", priv->chip->npwm);
>  }
>  static DEVICE_ATTR_RO(npwm);
>  
> @@ -411,12 +413,12 @@ static int pwm_class_apply_state(struct pwm_export *export,
>  
>  static int pwm_class_resume_npwm(struct device *parent, unsigned int npwm)
>  {
> -	struct pwm_chip *chip = dev_get_drvdata(parent);
> +	struct pwm_chip_private *priv = dev_get_drvdata(parent);
>  	unsigned int i;
>  	int ret = 0;
>  
>  	for (i = 0; i < npwm; i++) {
> -		struct pwm_device *pwm = &chip->pwms[i];
> +		struct pwm_device *pwm = &priv->pwms[i];
>  		struct pwm_state state;
>  		struct pwm_export *export;
>  
> @@ -442,12 +444,12 @@ static int pwm_class_resume_npwm(struct device *parent, unsigned int npwm)
>  
>  static int pwm_class_suspend(struct device *parent)
>  {
> -	struct pwm_chip *chip = dev_get_drvdata(parent);
> +	struct pwm_chip_private *priv = dev_get_drvdata(parent);
>  	unsigned int i;
>  	int ret = 0;
>  
> -	for (i = 0; i < chip->npwm; i++) {
> -		struct pwm_device *pwm = &chip->pwms[i];
> +	for (i = 0; i < priv->chip->npwm; i++) {
> +		struct pwm_device *pwm = &priv->pwms[i];
>  		struct pwm_state state;
>  		struct pwm_export *export;
>  
> @@ -483,9 +485,9 @@ static int pwm_class_suspend(struct device *parent)
>  
>  static int pwm_class_resume(struct device *parent)
>  {
> -	struct pwm_chip *chip = dev_get_drvdata(parent);
> +	struct pwm_chip_private *priv = dev_get_drvdata(parent);
>  
> -	return pwm_class_resume_npwm(parent, chip->npwm);
> +	return pwm_class_resume_npwm(parent, priv->chip->npwm);

One more pointer dereference than before.

>  }
>  
>  static DEFINE_SIMPLE_DEV_PM_OPS(pwm_class_pm_ops, pwm_class_suspend, pwm_class_resume);
> @@ -501,7 +503,7 @@ static int pwmchip_sysfs_match(struct device *parent, const void *data)
>  	return dev_get_drvdata(parent) == data;
>  }
>  
> -void pwmchip_sysfs_export(struct pwm_chip *chip)
> +void pwmchip_sysfs_export(struct pwm_chip_private *priv)
>  {
>  	struct device *parent;
>  
> @@ -509,26 +511,26 @@ void pwmchip_sysfs_export(struct pwm_chip *chip)
>  	 * If device_create() fails the pwm_chip is still usable by
>  	 * the kernel it's just not exported.
>  	 */
> -	parent = device_create(&pwm_class, chip->dev, MKDEV(0, 0), chip,
> -			       "pwmchip%d", chip->id);
> +	parent = device_create(&pwm_class, priv->chip->dev, MKDEV(0, 0), priv,
> +			       "pwmchip%d", priv->id);
>  	if (IS_ERR(parent)) {
> -		dev_warn(chip->dev,
> +		dev_warn(priv->chip->dev,

One more pointer dereference than before.

>  			 "device_create failed for pwm_chip sysfs export\n");
>  	}
>  }

The TL;DR; is essentially what I already wrote in my last reply to Bart
in the v3 thread[1]:

 - My approach needs more changes to the individual drivers (which I
   don't consider a relevant disadvantage given that the resulting code
   is better);
 - My approach works with less pointer dereferences which IMHO also
   simplifies understanding the code as all relevant data is in a single
   place.
 - My approach has a weaker separation between the core and the lowlevel
   drivers. That's ok in my book given that this doesn't complicate the
   lowlevel drivers and that hiding details considerably better doesn't
   work anyhow (see the drivers that need internal.h in your patch).

For me the single allocation issue is only an added bonus. The relevant
advantage of my approach is that the code is easier and (probably) more
efficient.

Best regards
Uwe

[1] https://lore.kernel.org/linux-pwm/20231205093145.l7p52xtw2ak756ra@pengutronix.de


-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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Re: [PATCH v4 000/115] pwm: Fix lifetime issues for pwm_chips

[Thierry Reding]

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On Fri, Dec 08, 2023 at 07:50:33PM +0100, Uwe Kleine-König wrote:
> Hello Thierry,
> 
> On Fri, Dec 08, 2023 at 04:41:39PM +0100, Thierry Reding wrote:
> > On Wed, Dec 06, 2023 at 12:43:14PM +0100, Uwe Kleine-König wrote:
> > > This series is based on Thierry's for-next.
> > > 
> > > It starts with some cleanups that were all sent out separately already:
> > > 
> > >  - "pwm: Reduce number of pointer dereferences in pwm_device_request()"
> > >    https://lore.kernel.org/linux-pwm/20231130072105.966848-1-u.kleine-koenig@pengutronix.de
> > >  - "pwm: crc: Use consistent variable naming for driver data"
> > >    https://lore.kernel.org/linux-pwm/20231130074133.969806-1-u.kleine-koenig@pengutronix.de
> > >  - Two leds/qcom-lpg patches
> > >    https://lore.kernel.org/linux-leds/20231126095230.683204-1-u.kleine-koenig@pengutronix.de
> > >    Lee already claimed to have taken the series already, but it's not yet in
> > >    next.
> > >  - "leds: qcom-lpg: Introduce a wrapper for getting driver data from a pwm chip"
> > >    https://lore.kernel.org/linux-leds/20231124215208.616551-3-u.kleine-koenig@pengutronix.de
> > > 
> > > In the following patches I changed:
> > > 
> > >  - "pwm: cros-ec: Change prototype of helper to prepare further changes" +
> > >    This was simplified in response to feedback by Tzung-Bi Shih
> > >  - Make pwmchip_priv() static (and don't export it), let drivers use a new
> > >    pwmchip_get_drvdata() instead.
> > >  - For drm/ti-sn65dsi86.c and leds/qcom-lpg make use of
> > >    pwmchip_set_drvdata() which makes the conversion to
> > >    devm_pwmchip_alloc() much prettier.
> > >  - Some cleanups here and there
> > >  - Add review tags received in v3
> > >    I kept all tags even though the pwmchip_alloc() patches changed
> > >    slightly. Most of the time that's only
> > >    s/pwmchip_priv/pwmchip_get_drvdata/ though. Still, if you object,
> > >    just tell me. (This affects Paul Cercueil on patch #68, Conor Dooley
> > >    on patch #76 and Greg for patch #109.)
> > > 
> > > I kept the pwmchip_alloc() + pwmchip_register() approach despite Bart
> > > not liking it. To balance that out I don't like Bart's alternative
> > > approach. There are no technically relevant differences between the two
> > > approaches and no benchmarks that show either of the two to be better
> > > than the other. Conceptually the design ideas around pwmchip_alloc() +
> > > pwmchip_register() are used in several other subsystems, so it's a
> > > proven way to do things.
> > 
> > [Trimming the recipients, keeping only Bart and the mailing lists.]
> > 
> > I do think there are technically relevant differences. For one, the
> > better we isolate the internal data structure, the easier this becomes
> > to manage. I'm attaching a patch that I've prototyped which should
> > basically get us to somewhere around patch 110 of this series but with
> > something like 1/8th of the changes. It doesn't need every driver to
> > change and (mostly) decouples driver code from the core code.
> 
> You don't need to touch all drivers because you didn't change struct
> pwm_chip::dev yet. (If you really want, you don't need to change that,
> but then you have some duplication as chip->dev holds the same value as
> priv->dev.parent in the end.)

I don't think that's a problem. These are for two logically separate
things, after all. Duplication can also sometimes be useful to simplify
things. There are plently of cases where we use local variables for the
same reason.

> > Now, I know that you think this is all bad because it's not a single
> > allocation, but I much prefer the end result because it's got the driver
> > and internals much more cleanly separated. Going forward I think it
> > would be easier to apply all the ref-counting on top of that because we
> > only need to keep the PWM framework-internal data structure alive after
> > a PWM chip has gone away.
> 
> Nearly all drivers need driver private data. Isn't it a nice service by
> the pwm core to make handling this private data easier for the lowlevel
> drivers?

That's only true if you think pwmchip_alloc() makes it easier. I happen
to think that it doesn't. On the contrary, I think having drivers pass
in a PWM chip descriptor that can be embedded in driver-private data is
much easier.

> > From 72ea79887d96850f9ccc832ce52b907ca276c940 Mon Sep 17 00:00:00 2001
> > From: Thierry Reding <thierry.reding@gmail.com>
> > Date: Tue, 28 Nov 2023 15:42:39 +0100
> > Subject: [PATCH] pwm: Isolate internal data into a separate structure
> > 
> > In order to prepare for proper reference counting of PWM chips and PWM
> > devices, move the internal data from the public PWM chip to a private
> > PWM chip structure. This ensures that the data that the subsystem core
> > may need to reference later on can stick around beyond the lifetime of
> > the driver-private data.
> > 
> > Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
> > ---
> >  drivers/pwm/core.c            | 185 +++++++++++++++++++++-------------
> >  drivers/pwm/internal.h        |  38 +++++++
> >  drivers/pwm/pwm-atmel-hlcdc.c |   8 +-
> >  drivers/pwm/pwm-fsl-ftm.c     |   6 +-
> >  drivers/pwm/pwm-lpc18xx-sct.c |   4 +-
> >  drivers/pwm/pwm-lpss.c        |  14 +--
> >  drivers/pwm/pwm-pca9685.c     |   6 +-
> >  drivers/pwm/pwm-samsung.c     |   6 +-
> >  drivers/pwm/pwm-sifive.c      |   4 +-
> >  drivers/pwm/pwm-stm32-lp.c    |   6 +-
> >  drivers/pwm/pwm-stm32.c       |   6 +-
> >  drivers/pwm/pwm-tiecap.c      |   6 +-
> >  drivers/pwm/pwm-tiehrpwm.c    |   6 +-
> >  drivers/pwm/sysfs.c           |  48 ++++-----
> >  include/linux/pwm.h           |  26 +----
> >  15 files changed, 228 insertions(+), 141 deletions(-)
> >  create mode 100644 drivers/pwm/internal.h
> > 
> > diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
> > index f60b715abe62..54d57dec6dce 100644
> > --- a/drivers/pwm/core.c
> > +++ b/drivers/pwm/core.c
> > @@ -24,17 +24,19 @@
> >  #define CREATE_TRACE_POINTS
> >  #include <trace/events/pwm.h>
> >  
> > +#include "internal.h"
> > +
> >  static DEFINE_MUTEX(pwm_lookup_lock);
> >  static LIST_HEAD(pwm_lookup_list);
> >  
> > -/* protects access to pwmchip_idr */
> > +/* protects access to pwm_chips */
> >  static DEFINE_MUTEX(pwm_lock);
> >  
> > -static DEFINE_IDR(pwmchip_idr);
> > +static DEFINE_IDR(pwm_chips);
> 
> That's an unrelated change.

Yeah, it should probably go into the patch that changes the list to an
IDR. There's really no reason why this needed to change in the first
place.

> 
> >  static struct pwm_chip *pwmchip_find_by_name(const char *name)
> >  {
> > -	struct pwm_chip *chip;
> > +	struct pwm_chip_private *priv;
> >  	unsigned long id, tmp;
> >  
> >  	if (!name)
> > @@ -42,12 +44,12 @@ static struct pwm_chip *pwmchip_find_by_name(const char *name)
> >  
> >  	mutex_lock(&pwm_lock);
> >  
> > -	idr_for_each_entry_ul(&pwmchip_idr, chip, tmp, id) {
> > -		const char *chip_name = dev_name(chip->dev);
> > +	idr_for_each_entry_ul(&pwm_chips, priv, tmp, id) {
> > +		const char *chip_name = dev_name(priv->chip->dev);
> 
> two pointer dereferences instead of one before.
> 
> >  		if (chip_name && strcmp(chip_name, name) == 0) {
> >  			mutex_unlock(&pwm_lock);
> > -			return chip;
> > +			return priv->chip;
> 
> one pointer reference instead of none before.
> 
> >  		}
> >  	}
> >  
> > @@ -58,23 +60,24 @@ static struct pwm_chip *pwmchip_find_by_name(const char *name)
> >  
> >  static int pwm_device_request(struct pwm_device *pwm, const char *label)
> >  {
> > +	struct pwm_chip *chip = pwm->priv->chip;
> 
> With my approach getting the chip of a struct pwm_device is only one
> pointer dereference away. You need two.

None of the functions here are called very often, so even if this isn't
optimized away it would hardly matter.

> >  	int err;
> >  
> >  	if (test_bit(PWMF_REQUESTED, &pwm->flags))
> >  		return -EBUSY;
> >  
> > -	if (!try_module_get(pwm->chip->owner))
> > +	if (!try_module_get(pwm->priv->owner))
> >  		return -ENODEV;
> >  
> > -	if (pwm->chip->ops->request) {
> > -		err = pwm->chip->ops->request(pwm->chip, pwm);
> > +	if (chip->ops->request) {
> > +		err = chip->ops->request(chip, pwm);
> 
> You seem to have reimplemented half of
> https://lore.kernel.org/linux-pwm/20231130072105.966848-1-u.kleine-koenig@pengutronix.de
> here.

I started prototyping this before you sent out that patch.

> >  		if (err) {
> > -			module_put(pwm->chip->owner);
> > +			module_put(pwm->priv->owner);
> >  			return err;
> >  		}
> >  	}
> >  
> > -	if (pwm->chip->ops->get_state) {
> > +	if (chip->ops->get_state) {
> >  		/*
> >  		 * Zero-initialize state because most drivers are unaware of
> >  		 * .usage_power. The other members of state are supposed to be
> > @@ -84,7 +87,7 @@ static int pwm_device_request(struct pwm_device *pwm, const char *label)
> >  		 */
> >  		struct pwm_state state = { 0, };
> >  
> > -		err = pwm->chip->ops->get_state(pwm->chip, pwm, &state);
> > +		err = chip->ops->get_state(chip, pwm, &state);
> >  		trace_pwm_get(pwm, &state, err);
> >  
> >  		if (!err)
> > @@ -196,6 +199,64 @@ static bool pwm_ops_check(const struct pwm_chip *chip)
> >  	return true;
> >  }
> >  
> > +static struct pwm_chip_private *pwmchip_alloc(struct pwm_chip *chip,
> > +					      struct module *owner)
> > +{
> > +	struct pwm_chip_private *priv;
> > +	struct pwm_device *pwm;
> > +	unsigned int i;
> > +	int err;
> > +
> > +	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> > +	if (!priv)
> > +		return ERR_PTR(-ENOMEM);
> > +
> > +	priv->pwms = kcalloc(chip->npwm, sizeof(*pwm), GFP_KERNEL);
> > +	if (!priv->pwms) {
> > +		err = -ENOMEM;
> > +		goto free;
> > +	}
> 
> Oh, so you don't use one additional allocation but two.

This could easily be folded into one, but we already determined that we
both have different opinions about whether this matters a lot or not.

> 
> > +	priv->owner = owner;
> > +	priv->chip = chip;
> > +
> > +	for (i = 0; i < chip->npwm; i++) {
> > +		struct pwm_device *pwm = &priv->pwms[i];
> > +
> > +		pwm->priv = priv;
> > +		pwm->hwpwm = i;
> > +	}
> > +
> > +	mutex_lock(&pwm_lock);
> > +
> > +	err = idr_alloc(&pwm_chips, priv, 0, 0, GFP_KERNEL);
> > +	if (err < 0) {
> > +		mutex_unlock(&pwm_lock);
> > +		goto free;
> > +	}
> > +
> > +	mutex_unlock(&pwm_lock);
> > +
> > +	priv->id = err;
> > +
> > +	return priv;
> > +
> > +free:
> > +	kfree(priv->pwms);
> > +	kfree(priv);
> > +	return ERR_PTR(err);
> > +}
> > +
> > +static void pwmchip_free(struct pwm_chip_private *priv)
> > +{
> > +	mutex_lock(&pwm_lock);
> > +	idr_remove(&pwm_chips, priv->id);
> > +	mutex_unlock(&pwm_lock);
> > +
> > +	kfree(priv->pwms);
> > +	kfree(priv);
> > +}
> > +
> >  /**
> >   * __pwmchip_add() - register a new PWM chip
> >   * @chip: the PWM chip to add
> > @@ -208,8 +269,7 @@ static bool pwm_ops_check(const struct pwm_chip *chip)
> >   */
> >  int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
> >  {
> > -	unsigned int i;
> > -	int ret;
> > +	struct pwm_chip_private *priv;
> >  
> >  	if (!chip || !chip->dev || !chip->ops || !chip->npwm)
> >  		return -EINVAL;
> > @@ -217,36 +277,16 @@ int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
> >  	if (!pwm_ops_check(chip))
> >  		return -EINVAL;
> >  
> > -	chip->owner = owner;
> > -
> > -	chip->pwms = kcalloc(chip->npwm, sizeof(*chip->pwms), GFP_KERNEL);
> > -	if (!chip->pwms)
> > +	priv = pwmchip_alloc(chip, owner);
> > +	if (!priv)
> >  		return -ENOMEM;
> >  
> > -	mutex_lock(&pwm_lock);
> > -
> > -	ret = idr_alloc(&pwmchip_idr, chip, 0, 0, GFP_KERNEL);
> > -	if (ret < 0) {
> > -		mutex_unlock(&pwm_lock);
> > -		kfree(chip->pwms);
> > -		return ret;
> > -	}
> > -
> > -	chip->id = ret;
> > -
> > -	for (i = 0; i < chip->npwm; i++) {
> > -		struct pwm_device *pwm = &chip->pwms[i];
> > -
> > -		pwm->chip = chip;
> > -		pwm->hwpwm = i;
> > -	}
> > -
> > -	mutex_unlock(&pwm_lock);
> > +	chip->priv = priv;
> >  
> >  	if (IS_ENABLED(CONFIG_OF))
> >  		of_pwmchip_add(chip);
> >  
> > -	pwmchip_sysfs_export(chip);
> > +	pwmchip_sysfs_export(priv);
> >  
> >  	return 0;
> >  }
> > @@ -260,18 +300,14 @@ EXPORT_SYMBOL_GPL(__pwmchip_add);
> >   */
> >  void pwmchip_remove(struct pwm_chip *chip)
> >  {
> > -	pwmchip_sysfs_unexport(chip);
> > -
> > -	if (IS_ENABLED(CONFIG_OF))
> > -		of_pwmchip_remove(chip);
> > -
> >  	mutex_lock(&pwm_lock);
> >  
> > -	idr_remove(&pwmchip_idr, chip->id);
> > +	pwmchip_sysfs_unexport(chip->priv);
> >  
> > -	mutex_unlock(&pwm_lock);
> > +	if (IS_ENABLED(CONFIG_OF))
> > +		of_pwmchip_remove(chip);
> >  
> > -	kfree(chip->pwms);
> > +	pwmchip_free(chip->priv);
> >  }
> >  EXPORT_SYMBOL_GPL(pwmchip_remove);
> >  
> > @@ -315,7 +351,7 @@ struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
> >  		return ERR_PTR(-EINVAL);
> >  
> >  	mutex_lock(&pwm_lock);
> > -	pwm = &chip->pwms[index];
> > +	pwm = &chip->priv->pwms[index];
> 
> two pointer dereferences instead of one before.
> 
> >  	err = pwm_device_request(pwm, label);
> >  	if (err < 0)
> > @@ -329,9 +365,9 @@ EXPORT_SYMBOL_GPL(pwm_request_from_chip);
> >  static void pwm_apply_state_debug(struct pwm_device *pwm,
> >  				  const struct pwm_state *state)
> >  {
> > -	struct pwm_state *last = &pwm->last;
> > -	struct pwm_chip *chip = pwm->chip;
> > +	struct pwm_chip *chip = pwm->priv->chip;
> >  	struct pwm_state s1 = { 0 }, s2 = { 0 };
> > +	struct pwm_state *last = &pwm->last;
> >  	int err;
> >  
> >  	if (!IS_ENABLED(CONFIG_PWM_DEBUG))
> > @@ -439,7 +475,6 @@ static void pwm_apply_state_debug(struct pwm_device *pwm,
> >   */
> >  int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
> >  {
> > -	struct pwm_chip *chip;
> >  	int err;
> >  
> >  	/*
> > @@ -455,8 +490,6 @@ int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
> >  	    state->duty_cycle > state->period)
> >  		return -EINVAL;
> >  
> > -	chip = pwm->chip;
> > -
> >  	if (state->period == pwm->state.period &&
> >  	    state->duty_cycle == pwm->state.duty_cycle &&
> >  	    state->polarity == pwm->state.polarity &&
> > @@ -464,7 +497,7 @@ int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
> >  	    state->usage_power == pwm->state.usage_power)
> >  		return 0;
> >  
> > -	err = chip->ops->apply(chip, pwm, state);
> > +	err = pwm->priv->chip->ops->apply(pwm->priv->chip, pwm, state);
> 
> four pointer dereferences instead of two before.
> 
> >  	trace_pwm_apply(pwm, state, err);
> >  	if (err)
> >  		return err;
> > @@ -492,16 +525,19 @@ EXPORT_SYMBOL_GPL(pwm_apply_state);
> >  int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result,
> >  		unsigned long timeout)
> >  {
> > +	struct pwm_chip *chip;
> >  	int err;
> >  
> > -	if (!pwm || !pwm->chip->ops)
> > +	if (!pwm)
> >  		return -EINVAL;
> >  
> > -	if (!pwm->chip->ops->capture)
> > +	chip = pwm->priv->chip;
> 
> One pointer deference more than before (assuming sensible compilation).
> 
> > +	if (!chip || !chip->ops || !chip->ops->capture)
> >  		return -ENOSYS;
> 
> Changing the return code for !chip->ops isn't intended, is it?

It's a quick prototype, I didn't pay particular attention to keeping all
error codes exactly as they were before.

> > diff --git a/drivers/pwm/internal.h b/drivers/pwm/internal.h
> > new file mode 100644
> > index 000000000000..44fffd3b6744
> > --- /dev/null
> > +++ b/drivers/pwm/internal.h
> > @@ -0,0 +1,38 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +
> > +#ifndef PWM_INTERNAL_H
> > +#define PWM_INTERNAL_H
> > +
> > +#include <linux/list.h>
> 
> This is unused?

Yes, can be dropped now. This was prototyped prior to the IDR rework and
I forgot to drop this after rebasing it on top.

> > +struct pwm_chip;
> > +struct pwm_device;
> > +
> > +/**
> > + * struct pwm_chip_private - subsystem-private PWM chip data
> > + * @chip: driver-private PWM chip data
> > + * @owner: module providing the chip
> > + * @pwms: array of PWM devices allocated by the framework
> > + * @base: number of first PWM controlled by this chip
> > + */
> > +struct pwm_chip_private {
> > +	struct pwm_chip *chip;
> > +	struct module *owner;
> > +	struct pwm_device *pwms;
> > +	unsigned int id;
> > +};
> 
> With my approach the struct pwm_chip * pointer isn't needed because it's
> all in one structure. So you have two structures where I only have one
> and your two are bigger in sum than my single one (not counting memory
> management overhead and alignment).

The split is on purpose and has the benefit of clearly separating the
PWM internal data structures from the driver accessible ones. So in my
book this is an advantage.

> > +#ifdef CONFIG_PWM_SYSFS
> > +void pwmchip_sysfs_export(struct pwm_chip_private *priv);
> > +void pwmchip_sysfs_unexport(struct pwm_chip_private *priv);
> > +#else
> > +static inline void pwmchip_sysfs_export(struct pwm_chip_private *priv)
> > +{
> > +}
> > +
> > +static inline void pwmchip_sysfs_unexport(struct pwm_chip_private *priv)
> > +{
> > +}
> > +#endif /* CONFIG_PWM_SYSFS */
> > +
> > +#endif /* PWM_INTERNAL_H */
> > diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
> > index 3f2c5031a3ba..6bbbfaa582c1 100644
> > --- a/drivers/pwm/pwm-atmel-hlcdc.c
> > +++ b/drivers/pwm/pwm-atmel-hlcdc.c
> > @@ -15,6 +15,8 @@
> >  #include <linux/pwm.h>
> >  #include <linux/regmap.h>
> >  
> > +#include "internal.h"
> > +
> >  #define ATMEL_HLCDC_PWMCVAL_MASK	GENMASK(15, 8)
> >  #define ATMEL_HLCDC_PWMCVAL(x)		(((x) << 8) & ATMEL_HLCDC_PWMCVAL_MASK)
> >  #define ATMEL_HLCDC_PWMPOL		BIT(4)
> > @@ -185,7 +187,7 @@ static int atmel_hlcdc_pwm_suspend(struct device *dev)
> >  	struct atmel_hlcdc_pwm *atmel = dev_get_drvdata(dev);
> >  
> >  	/* Keep the periph clock enabled if the PWM is still running. */
> > -	if (pwm_is_enabled(&atmel->chip.pwms[0]))
> > +	if (pwm_is_enabled(&atmel->chip.priv->pwms[0]))
> 
> Didn't work so well to hide the internals of pwm_chip_private from the
> drivers?
> 
> >  		clk_disable_unprepare(atmel->hlcdc->periph_clk);
> >  
> >  	return 0;
> >  
> 
> [... a few more drivers where hiding the internals failed ...]

Yes, and you'll recall that these are for exactly the cases where in the
past you have argued that the core should take a more active role in
making sure that PWMs get properly disabled. These should be temporary
and once this logic is all moved into the core these should disappear.

> 
> > diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
> > index 4edb994fa2e1..653df20afe1c 100644
> > --- a/drivers/pwm/sysfs.c
> > +++ b/drivers/pwm/sysfs.c
> > @@ -14,6 +14,8 @@
> >  #include <linux/kdev_t.h>
> >  #include <linux/pwm.h>
> >  
> > +#include "internal.h"
> > +
> >  struct pwm_export {
> >  	struct device child;
> >  	struct pwm_device *pwm;
> > @@ -311,7 +313,7 @@ static ssize_t export_store(struct device *parent,
> >  			    struct device_attribute *attr,
> >  			    const char *buf, size_t len)
> >  {
> > -	struct pwm_chip *chip = dev_get_drvdata(parent);
> > +	struct pwm_chip_private *priv = dev_get_drvdata(parent);
> >  	struct pwm_device *pwm;
> >  	unsigned int hwpwm;
> >  	int ret;
> > @@ -320,10 +322,10 @@ static ssize_t export_store(struct device *parent,
> >  	if (ret < 0)
> >  		return ret;
> >  
> > -	if (hwpwm >= chip->npwm)
> > +	if (hwpwm >= priv->chip->npwm)
> 
> One more pointer dereference than before. You could trade that for some
> data duplication by copying npwm to struct pwmchip_priv for the case
> when you need .npwm but the chip is already gone.

When the chip is gone, none of these functions should be doing anything
other than returning an error. None of that is implemented in this yet.
This is merely a preparatory patch.

> 
> >  		return -ENODEV;
> >  
> > -	pwm = pwm_request_from_chip(chip, hwpwm, "sysfs");
> > +	pwm = pwm_request_from_chip(priv->chip, hwpwm, "sysfs");
> >  	if (IS_ERR(pwm))
> >  		return PTR_ERR(pwm);
> >  
> > @@ -339,7 +341,7 @@ static ssize_t unexport_store(struct device *parent,
> >  			      struct device_attribute *attr,
> >  			      const char *buf, size_t len)
> >  {
> > -	struct pwm_chip *chip = dev_get_drvdata(parent);
> > +	struct pwm_chip_private *priv = dev_get_drvdata(parent);
> >  	unsigned int hwpwm;
> >  	int ret;
> >  
> > @@ -347,10 +349,10 @@ static ssize_t unexport_store(struct device *parent,
> >  	if (ret < 0)
> >  		return ret;
> >  
> > -	if (hwpwm >= chip->npwm)
> > +	if (hwpwm >= priv->chip->npwm)
> 
> One more pointer dereference than before.
> 
> >  		return -ENODEV;
> >  
> > -	ret = pwm_unexport_child(parent, &chip->pwms[hwpwm]);
> > +	ret = pwm_unexport_child(parent, &priv->pwms[hwpwm]);
> >  
> >  	return ret ? : len;
> >  }
> > @@ -359,9 +361,9 @@ static DEVICE_ATTR_WO(unexport);
> >  static ssize_t npwm_show(struct device *parent, struct device_attribute *attr,
> >  			 char *buf)
> >  {
> > -	const struct pwm_chip *chip = dev_get_drvdata(parent);
> > +	const struct pwm_chip_private *priv = dev_get_drvdata(parent);
> >  
> > -	return sysfs_emit(buf, "%u\n", chip->npwm);
> > +	return sysfs_emit(buf, "%u\n", priv->chip->npwm);
> >  }
> >  static DEVICE_ATTR_RO(npwm);
> >  
> > @@ -411,12 +413,12 @@ static int pwm_class_apply_state(struct pwm_export *export,
> >  
> >  static int pwm_class_resume_npwm(struct device *parent, unsigned int npwm)
> >  {
> > -	struct pwm_chip *chip = dev_get_drvdata(parent);
> > +	struct pwm_chip_private *priv = dev_get_drvdata(parent);
> >  	unsigned int i;
> >  	int ret = 0;
> >  
> >  	for (i = 0; i < npwm; i++) {
> > -		struct pwm_device *pwm = &chip->pwms[i];
> > +		struct pwm_device *pwm = &priv->pwms[i];
> >  		struct pwm_state state;
> >  		struct pwm_export *export;
> >  
> > @@ -442,12 +444,12 @@ static int pwm_class_resume_npwm(struct device *parent, unsigned int npwm)
> >  
> >  static int pwm_class_suspend(struct device *parent)
> >  {
> > -	struct pwm_chip *chip = dev_get_drvdata(parent);
> > +	struct pwm_chip_private *priv = dev_get_drvdata(parent);
> >  	unsigned int i;
> >  	int ret = 0;
> >  
> > -	for (i = 0; i < chip->npwm; i++) {
> > -		struct pwm_device *pwm = &chip->pwms[i];
> > +	for (i = 0; i < priv->chip->npwm; i++) {
> > +		struct pwm_device *pwm = &priv->pwms[i];
> >  		struct pwm_state state;
> >  		struct pwm_export *export;
> >  
> > @@ -483,9 +485,9 @@ static int pwm_class_suspend(struct device *parent)
> >  
> >  static int pwm_class_resume(struct device *parent)
> >  {
> > -	struct pwm_chip *chip = dev_get_drvdata(parent);
> > +	struct pwm_chip_private *priv = dev_get_drvdata(parent);
> >  
> > -	return pwm_class_resume_npwm(parent, chip->npwm);
> > +	return pwm_class_resume_npwm(parent, priv->chip->npwm);
> 
> One more pointer dereference than before.
> 
> >  }
> >  
> >  static DEFINE_SIMPLE_DEV_PM_OPS(pwm_class_pm_ops, pwm_class_suspend, pwm_class_resume);
> > @@ -501,7 +503,7 @@ static int pwmchip_sysfs_match(struct device *parent, const void *data)
> >  	return dev_get_drvdata(parent) == data;
> >  }
> >  
> > -void pwmchip_sysfs_export(struct pwm_chip *chip)
> > +void pwmchip_sysfs_export(struct pwm_chip_private *priv)
> >  {
> >  	struct device *parent;
> >  
> > @@ -509,26 +511,26 @@ void pwmchip_sysfs_export(struct pwm_chip *chip)
> >  	 * If device_create() fails the pwm_chip is still usable by
> >  	 * the kernel it's just not exported.
> >  	 */
> > -	parent = device_create(&pwm_class, chip->dev, MKDEV(0, 0), chip,
> > -			       "pwmchip%d", chip->id);
> > +	parent = device_create(&pwm_class, priv->chip->dev, MKDEV(0, 0), priv,
> > +			       "pwmchip%d", priv->id);
> >  	if (IS_ERR(parent)) {
> > -		dev_warn(chip->dev,
> > +		dev_warn(priv->chip->dev,
> 
> One more pointer dereference than before.
> 
> >  			 "device_create failed for pwm_chip sysfs export\n");
> >  	}
> >  }
> 
> The TL;DR; is essentially what I already wrote in my last reply to Bart
> in the v3 thread[1]:
> 
>  - My approach needs more changes to the individual drivers (which I
>    don't consider a relevant disadvantage given that the resulting code
>    is better);
>  - My approach works with less pointer dereferences which IMHO also
>    simplifies understanding the code as all relevant data is in a single
>    place.
>  - My approach has a weaker separation between the core and the lowlevel
>    drivers. That's ok in my book given that this doesn't complicate the
>    lowlevel drivers and that hiding details considerably better doesn't
>    work anyhow (see the drivers that need internal.h in your patch).
> 
> For me the single allocation issue is only an added bonus. The relevant
> advantage of my approach is that the code is easier and (probably) more
> efficient.

I happen to disagree. I think adding pwmchip_alloc() makes things much
more complicated for low level drivers.

Thierry

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Re: [PATCH v4 000/115] pwm: Fix lifetime issues for pwm_chips

[Uwe Kleine-König]

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Hello Thierry,

On Mon, Dec 11, 2023 at 12:33:04PM +0100, Thierry Reding wrote:
> On Fri, Dec 08, 2023 at 07:50:33PM +0100, Uwe Kleine-König wrote:
> > The TL;DR; is essentially what I already wrote in my last reply to Bart
> > in the v3 thread[1]:
> > 
> >  - My approach needs more changes to the individual drivers (which I
> >    don't consider a relevant disadvantage given that the resulting code
> >    is better);
> >  - My approach works with less pointer dereferences which IMHO also
> >    simplifies understanding the code as all relevant data is in a single
> >    place.
> >  - My approach has a weaker separation between the core and the lowlevel
> >    drivers. That's ok in my book given that this doesn't complicate the
> >    lowlevel drivers and that hiding details considerably better doesn't
> >    work anyhow (see the drivers that need internal.h in your patch).
> > 
> > For me the single allocation issue is only an added bonus. The relevant
> > advantage of my approach is that the code is easier and (probably) more
> > efficient.
> 
> I happen to disagree. I think adding pwmchip_alloc() makes things much
> more complicated for low level drivers.

Looking at e.g.
https://lore.kernel.org/linux-pwm/2dda818b8bbbe8ba4b9df5ab54f960ff4a4f1ab5.1701860672.git.u.kleine-koenig@pengutronix.de/
I wonder where you see "much more complication". OK, there are two
pointers now for chip and private data, but I'd call that at most a
"mild" complication[1] which is more than balanced out by the
simplifications in the remaining parts of that patch.

Best regards
Uwe

[1] I'm not sure I'd refuse someone suggesting the following patch on
    top of today's next:

	diff --git a/drivers/pwm/pwm-microchip-core.c b/drivers/pwm/pwm-microchip-core.c
	index c0c53968f3e9..d32e65914599 100644
	--- a/drivers/pwm/pwm-microchip-core.c
	+++ b/drivers/pwm/pwm-microchip-core.c
	@@ -448,12 +448,14 @@ MODULE_DEVICE_TABLE(of, mchp_core_of_match);
	 static int mchp_core_pwm_probe(struct platform_device *pdev)
	 {
		struct mchp_core_pwm_chip *mchp_core_pwm;
	+	struct pwm_chip *chip;
		struct resource *regs;
		int ret;
	 
		mchp_core_pwm = devm_kzalloc(&pdev->dev, sizeof(*mchp_core_pwm), GFP_KERNEL);
		if (!mchp_core_pwm)
			return -ENOMEM;
	+	chip = &mchp_core_pwm->chip;
	 
		mchp_core_pwm->base = devm_platform_get_and_ioremap_resource(pdev, 0, &regs);
		if (IS_ERR(mchp_core_pwm->base))
	@@ -470,9 +472,9 @@ static int mchp_core_pwm_probe(struct platform_device *pdev)
	 
		mutex_init(&mchp_core_pwm->lock);
	 
	-	mchp_core_pwm->chip.dev = &pdev->dev;
	-	mchp_core_pwm->chip.ops = &mchp_core_pwm_ops;
	-	mchp_core_pwm->chip.npwm = 16;
	+	chip->dev = &pdev->dev;
	+	chip->ops = &mchp_core_pwm_ops;
	+	chip->npwm = 16;
	 
		mchp_core_pwm->channel_enabled = readb_relaxed(mchp_core_pwm->base + MCHPCOREPWM_EN(0));
		mchp_core_pwm->channel_enabled |=
	@@ -485,7 +487,7 @@ static int mchp_core_pwm_probe(struct platform_device *pdev)
		writel_relaxed(1U, mchp_core_pwm->base + MCHPCOREPWM_SYNC_UPD);
		mchp_core_pwm->update_timestamp = ktime_get();
	 
	-	ret = devm_pwmchip_add(&pdev->dev, &mchp_core_pwm->chip);
	+	ret = devm_pwmchip_add(&pdev->dev, chip);
		if (ret)
			return dev_err_probe(&pdev->dev, ret, "Failed to add pwmchip\n");
 
    With that applied before the above mentioned patch there is no
    complication at all in my eyes.


-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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Re: [PATCH v4 000/115] pwm: Fix lifetime issues for pwm_chips

[Uwe Kleine-König]

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Hello Thierry,

On Mon, Dec 11, 2023 at 12:33:04PM +0100, Thierry Reding wrote:
> On Fri, Dec 08, 2023 at 07:50:33PM +0100, Uwe Kleine-König wrote:
> > You don't need to touch all drivers because you didn't change struct
> > pwm_chip::dev yet. (If you really want, you don't need to change that,
> > but then you have some duplication as chip->dev holds the same value as
> > priv->dev.parent in the end.)
> 
> I don't think that's a problem. These are for two logically separate
> things, after all.

How are they different? I'd say one is the initializer for the other and
(ideally) unused after that. With that interpretation they are indeed
different, but then it's ugly that the initializer keeps staying around.

> Duplication can also sometimes be useful to simplify
> things. There are plently of cases where we use local variables for the
> same reason.

local variables go away though after the respective function is left.
chip->dev and its copy priv->dev.parent stay around for the full
lifetime of the chip.

> > > @@ -58,23 +60,24 @@ static struct pwm_chip *pwmchip_find_by_name(const char *name)
> > >  
> > >  static int pwm_device_request(struct pwm_device *pwm, const char *label)
> > >  {
> > > +	struct pwm_chip *chip = pwm->priv->chip;
> > 
> > With my approach getting the chip of a struct pwm_device is only one
> > pointer dereference away. You need two.
> 
> None of the functions here are called very often, so even if this isn't
> optimized away it would hardly matter.

I'd say pwm_apply_state() at least matters. Also I think that making a
slow path quicker is a good thing. 

I wonder how we'll converge to an approach that can go into the
mainline given that we both have our strong opinions.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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Re: [PATCH v4 097/115] pwm: sun4i: Make use of devm_pwmchip_alloc() function

[Jernej Škrabec]

On Wednesday, December 6, 2023 12:44:51 PM CET Uwe Kleine-König wrote:
> This prepares the pwm-sun4i driver to further changes of the pwm core
> outlined in the commit introducing devm_pwmchip_alloc(). There is no
> intended semantical change and the driver should behave as before.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej

Re: [PATCH v4 107/115] drm/bridge: ti-sn65dsi86: Make use of devm_pwmchip_alloc() function

[Robert Foss]

On Wed, Dec 6, 2023 at 12:49 PM Uwe Kleine-König
<u.kleine-koenig@pengutronix.de> wrote:
>
> This prepares the pwm driver of the ti-sn65dsi86 to further changes of
> the pwm core outlined in the commit introducing devm_pwmchip_alloc().
> There is no intended semantical change and the driver should behave as
> before.
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> ---
>  drivers/gpu/drm/bridge/ti-sn65dsi86.c | 27 ++++++++++++++++++---------
>  1 file changed, 18 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> index c45c07840f64..33eb2ed0a729 100644
> --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> @@ -197,7 +197,7 @@ struct ti_sn65dsi86 {
>         DECLARE_BITMAP(gchip_output, SN_NUM_GPIOS);
>  #endif
>  #if defined(CONFIG_PWM)
> -       struct pwm_chip                 pchip;
> +       struct pwm_chip                 *pchip;
>         bool                            pwm_enabled;
>         atomic_t                        pwm_pin_busy;
>  #endif
> @@ -1372,7 +1372,7 @@ static void ti_sn_pwm_pin_release(struct ti_sn65dsi86 *pdata)
>
>  static struct ti_sn65dsi86 *pwm_chip_to_ti_sn_bridge(struct pwm_chip *chip)
>  {
> -       return container_of(chip, struct ti_sn65dsi86, pchip);
> +       return pwmchip_get_drvdata(chip);
>  }
>
>  static int ti_sn_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
> @@ -1585,22 +1585,31 @@ static const struct pwm_ops ti_sn_pwm_ops = {
>  static int ti_sn_pwm_probe(struct auxiliary_device *adev,
>                            const struct auxiliary_device_id *id)
>  {
> +       struct pwm_chip *chip;
>         struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent);
>
> -       pdata->pchip.dev = pdata->dev;
> -       pdata->pchip.ops = &ti_sn_pwm_ops;
> -       pdata->pchip.npwm = 1;
> -       pdata->pchip.of_xlate = of_pwm_single_xlate;
> -       pdata->pchip.of_pwm_n_cells = 1;
> +       /*
> +        * This should better use adev->dev instead of pdata->dev. See
> +        * https://lore.kernel.org/dri-devel/20231127101547.734061-2-u.kleine-koenig@pengutronix.de
> +        */
> +       pdata->pchip = chip = devm_pwmchip_alloc(pdata->dev, 1, 0);
> +       if (IS_ERR(chip))
> +               return PTR_ERR(chip);
>
> -       return pwmchip_add(&pdata->pchip);
> +       pwmchip_set_drvdata(chip, pdata);
> +
> +       chip->ops = &ti_sn_pwm_ops;
> +       chip->of_xlate = of_pwm_single_xlate;
> +       chip->of_pwm_n_cells = 1;
> +
> +       return pwmchip_add(chip);
>  }
>
>  static void ti_sn_pwm_remove(struct auxiliary_device *adev)
>  {
>         struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent);
>
> -       pwmchip_remove(&pdata->pchip);
> +       pwmchip_remove(pdata->pchip);
>
>         if (pdata->pwm_enabled)
>                 pm_runtime_put_sync(pdata->dev);
> --
> 2.42.0
>

Acked-by: Robert Foss <rfoss@kernel.org>