[PATCH v3 0/5] pwm: support backward compatibility of DTB extending PWM args

[PATCH v3 0/5] pwm: support backward compatibility of DTB extending PWM args

[Vladimir Zapolskiy]

Please review this alternative in-house version of supporting backward
compatibility of DTB files (new kernel/PWM driver and old DTS), overcoming
a problem that pwms arguments of existing PWM drivers are to be extended
with polarity field.

Unfortunately I've firstly created the change and only after that
found that Lothar Waßmann is working on his version, so I won't insist
on formal preference, but still I like to share my variant since it
technically different from Lothar's one.

Changes from v2 to v3:
- improved commit messages
- added two more patches removing of_pwm_xlate_with_flags()

Changes from v1 to v2:
- corrected the proper kernel log level, thanks to Lothar Waßmann.

Vladimir Zapolskiy (5):
  pwm: process pwm polarity argument in of_pwm_simple_xlate()
  pwm: push up dynamic printk level on errors in of_pwm_get()
  pwm: set the actual number of pwms arguments defined in board dts
  pwm: do not set of_pwm_xlate_with_flags() as a callback
  pwm: remove of_pwm_xlate_with_flags() function

 drivers/pwm/core.c            |   42 ++++++++++++-----------------------------
 drivers/pwm/pwm-atmel-hlcdc.c |    2 --
 drivers/pwm/pwm-atmel-tcb.c   |    2 --
 drivers/pwm/pwm-atmel.c       |    6 ------
 drivers/pwm/pwm-bcm-kona.c    |    2 --
 drivers/pwm/pwm-fsl-ftm.c     |    2 --
 drivers/pwm/pwm-renesas-tpu.c |    2 --
 drivers/pwm/pwm-rockchip.c    |    5 -----
 drivers/pwm/pwm-samsung.c     |    3 ---
 drivers/pwm/pwm-tiecap.c      |    2 --
 drivers/pwm/pwm-tiehrpwm.c    |    2 --
 drivers/pwm/pwm-vt8500.c      |    2 --
 include/linux/pwm.h           |    3 ---
 13 files changed, 12 insertions(+), 63 deletions(-)

-- 
1.7.10.4

[PATCH 1/5] pwm: process pwm polarity argument in of_pwm_simple_xlate()

[Vladimir Zapolskiy]

The third optional argument of pwms is well defined as polarity and it
is already used in a number of pwm drivers, so, to minimize changes in
the remaining drivers which are to be updated accordingly set polarity
in default of_xlate() function.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Cc: Lothar Waßmann <LW@KARO-electronics.de>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
---
 drivers/pwm/core.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 966497d..681d154 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -174,6 +174,13 @@ of_pwm_simple_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
 
 	pwm_set_period(pwm, args->args[1]);
 
+	if (pc->of_pwm_n_cells > 2) {
+		if (args->args[2] & PWM_POLARITY_INVERTED)
+			pwm_set_polarity(pwm, PWM_POLARITY_INVERSED);
+		else
+			pwm_set_polarity(pwm, PWM_POLARITY_NORMAL);
+	}
+
 	return pwm;
 }
 
-- 
1.7.10.4

[PATCH 2/5] pwm: push up dynamic printk level on errors in of_pwm_get()

[Vladimir Zapolskiy]

The changed three user messages on fault are printed under pr_debug(),
however all of them are unrecoverable and result in failed pwm device
registration, report this to a user.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Cc: Lothar Waßmann <LW@KARO-electronics.de>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
---
 drivers/pwm/core.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 681d154..f6231c6 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -532,19 +532,19 @@ struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id)
 	err = of_parse_phandle_with_args(np, "pwms", "#pwm-cells", index,
 					 &args);
 	if (err) {
-		pr_debug("%s(): can't parse \"pwms\" property\n", __func__);
+		pr_err("%s(): can't parse \"pwms\" property\n", __func__);
 		return ERR_PTR(err);
 	}
 
 	pc = of_node_to_pwmchip(args.np);
 	if (IS_ERR(pc)) {
-		pr_debug("%s(): PWM chip not found\n", __func__);
+		pr_err("%s(): PWM chip not found\n", __func__);
 		pwm = ERR_CAST(pc);
 		goto put;
 	}
 
 	if (args.args_count != pc->of_pwm_n_cells) {
-		pr_debug("%s: wrong #pwm-cells for %s\n", np->full_name,
+		pr_err("%s: wrong #pwm-cells for %s\n", np->full_name,
 			 args.np->full_name);
 		pwm = ERR_PTR(-EINVAL);
 		goto put;
-- 
1.7.10.4

[PATCH 3/5] pwm: set the actual number of pwms arguments defined in board dts

[Vladimir Zapolskiy]

For backward compatibility board device tree may define amount of only
mandatory pwm properties, which is compared to a pwm driver specific
value, by default it is 2 and may be overwritten by a driver.

Any additional arguments shall be considered as optional and they are
taken into account, only if #pwm-cells is increased accordingly.

As a positive side effect specific pwm-specifier array may have
variable size of #pwm-cells (but not less than amount of mandatory
arguments), which allows to omit optional arguments. The parameters
array of a specific PWM is updated according to the actual data taken
from device tree file.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Cc: Lothar Waßmann <LW@KARO-electronics.de>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
---
 drivers/pwm/core.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index f6231c6..4d9fc7f 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -543,12 +543,13 @@ struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id)
 		goto put;
 	}
 
-	if (args.args_count != pc->of_pwm_n_cells) {
+	if (args.args_count < pc->of_pwm_n_cells) {
 		pr_err("%s: wrong #pwm-cells for %s\n", np->full_name,
 			 args.np->full_name);
 		pwm = ERR_PTR(-EINVAL);
 		goto put;
 	}
+	pc->of_pwm_n_cells = args.args_count;
 
 	pwm = pc->of_xlate(pc, &args);
 	if (IS_ERR(pwm))
-- 
1.7.10.4

[PATCH 4/5] pwm: do not set of_pwm_xlate_with_flags() as a callback

[Vladimir Zapolskiy]

The default of_pwm_simple_xlate() function is capable to process PWM
inverted signal polarity flag, there is no need to use exported
of_pwm_xlate_with_flags() by the drivers.

The minimal expected by of_pwm_simple_xlate() amount of pwms arguments
is changed from 3 to 2, it allows to specify less PWM arguments in the
device tree omitting secondary configuration options (in this case it
is signal polarity value). The change has side effects, only if

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Lothar Waßmann <LW@KARO-electronics.de>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Tony Prisk <linux@prisktech.co.nz>
Cc: linux-pwm@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-rockchip@lists.infradead.org
---
 drivers/pwm/pwm-atmel-hlcdc.c |    2 --
 drivers/pwm/pwm-atmel-tcb.c   |    2 --
 drivers/pwm/pwm-atmel.c       |    6 ------
 drivers/pwm/pwm-bcm-kona.c    |    2 --
 drivers/pwm/pwm-fsl-ftm.c     |    2 --
 drivers/pwm/pwm-renesas-tpu.c |    2 --
 drivers/pwm/pwm-rockchip.c    |    5 -----
 drivers/pwm/pwm-samsung.c     |    3 ---
 drivers/pwm/pwm-tiecap.c      |    2 --
 drivers/pwm/pwm-tiehrpwm.c    |    2 --
 drivers/pwm/pwm-vt8500.c      |    2 --
 11 files changed, 30 deletions(-)

diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
index eaf8b12..492a1b5 100644
--- a/drivers/pwm/pwm-atmel-hlcdc.c
+++ b/drivers/pwm/pwm-atmel-hlcdc.c
@@ -209,8 +209,6 @@ static int atmel_hlcdc_pwm_probe(struct platform_device *pdev)
 	chip->chip.dev = dev;
 	chip->chip.base = -1;
 	chip->chip.npwm = 1;
-	chip->chip.of_xlate = of_pwm_xlate_with_flags;
-	chip->chip.of_pwm_n_cells = 3;
 	chip->chip.can_sleep = 1;
 
 	ret = pwmchip_add(&chip->chip);
diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c
index d56e5b7..cbc46ad 100644
--- a/drivers/pwm/pwm-atmel-tcb.c
+++ b/drivers/pwm/pwm-atmel-tcb.c
@@ -394,8 +394,6 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
 
 	tcbpwm->chip.dev = &pdev->dev;
 	tcbpwm->chip.ops = &atmel_tcb_pwm_ops;
-	tcbpwm->chip.of_xlate = of_pwm_xlate_with_flags;
-	tcbpwm->chip.of_pwm_n_cells = 3;
 	tcbpwm->chip.base = -1;
 	tcbpwm->chip.npwm = NPWM;
 	tcbpwm->tc = tc;
diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index d3c22de..b57079d 100644
--- a/drivers/pwm/pwm-atmel.c
+++ b/drivers/pwm/pwm-atmel.c
@@ -347,12 +347,6 @@ static int atmel_pwm_probe(struct platform_device *pdev)
 
 	atmel_pwm->chip.dev = &pdev->dev;
 	atmel_pwm->chip.ops = &atmel_pwm_ops;
-
-	if (pdev->dev.of_node) {
-		atmel_pwm->chip.of_xlate = of_pwm_xlate_with_flags;
-		atmel_pwm->chip.of_pwm_n_cells = 3;
-	}
-
 	atmel_pwm->chip.base = -1;
 	atmel_pwm->chip.npwm = 4;
 	atmel_pwm->chip.can_sleep = true;
diff --git a/drivers/pwm/pwm-bcm-kona.c b/drivers/pwm/pwm-bcm-kona.c
index 02bc048..df2e03d 100644
--- a/drivers/pwm/pwm-bcm-kona.c
+++ b/drivers/pwm/pwm-bcm-kona.c
@@ -244,8 +244,6 @@ static int kona_pwmc_probe(struct platform_device *pdev)
 	kp->chip.ops = &kona_pwm_ops;
 	kp->chip.base = -1;
 	kp->chip.npwm = 6;
-	kp->chip.of_xlate = of_pwm_xlate_with_flags;
-	kp->chip.of_pwm_n_cells = 3;
 	kp->chip.can_sleep = true;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
diff --git a/drivers/pwm/pwm-fsl-ftm.c b/drivers/pwm/pwm-fsl-ftm.c
index 0f2cc7e..366d55b 100644
--- a/drivers/pwm/pwm-fsl-ftm.c
+++ b/drivers/pwm/pwm-fsl-ftm.c
@@ -454,8 +454,6 @@ static int fsl_pwm_probe(struct platform_device *pdev)
 		return PTR_ERR(fpc->clk[FSL_PWM_CLK_CNTEN]);
 
 	fpc->chip.ops = &fsl_pwm_ops;
-	fpc->chip.of_xlate = of_pwm_xlate_with_flags;
-	fpc->chip.of_pwm_n_cells = 3;
 	fpc->chip.base = -1;
 	fpc->chip.npwm = 8;
 	fpc->chip.can_sleep = true;
diff --git a/drivers/pwm/pwm-renesas-tpu.c b/drivers/pwm/pwm-renesas-tpu.c
index 3b71b42..46bc415 100644
--- a/drivers/pwm/pwm-renesas-tpu.c
+++ b/drivers/pwm/pwm-renesas-tpu.c
@@ -418,8 +418,6 @@ static int tpu_probe(struct platform_device *pdev)
 
 	tpu->chip.dev = &pdev->dev;
 	tpu->chip.ops = &tpu_pwm_ops;
-	tpu->chip.of_xlate = of_pwm_xlate_with_flags;
-	tpu->chip.of_pwm_n_cells = 3;
 	tpu->chip.base = -1;
 	tpu->chip.npwm = TPU_CHANNEL_MAX;
 
diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c
index 9442df2..8dc09e8 100644
--- a/drivers/pwm/pwm-rockchip.c
+++ b/drivers/pwm/pwm-rockchip.c
@@ -265,11 +265,6 @@ static int rockchip_pwm_probe(struct platform_device *pdev)
 	pc->chip.base = -1;
 	pc->chip.npwm = 1;
 
-	if (pc->data->ops->set_polarity) {
-		pc->chip.of_xlate = of_pwm_xlate_with_flags;
-		pc->chip.of_pwm_n_cells = 3;
-	}
-
 	ret = pwmchip_add(&pc->chip);
 	if (ret < 0) {
 		clk_unprepare(pc->clk);
diff --git a/drivers/pwm/pwm-samsung.c b/drivers/pwm/pwm-samsung.c
index ba6b650..6cc6913 100644
--- a/drivers/pwm/pwm-samsung.c
+++ b/drivers/pwm/pwm-samsung.c
@@ -482,9 +482,6 @@ static int pwm_samsung_probe(struct platform_device *pdev)
 		ret = pwm_samsung_parse_dt(chip);
 		if (ret)
 			return ret;
-
-		chip->chip.of_xlate = of_pwm_xlate_with_flags;
-		chip->chip.of_pwm_n_cells = 3;
 	} else {
 		if (!pdev->dev.platform_data) {
 			dev_err(&pdev->dev, "no platform data specified\n");
diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
index 74efbe7..bd6f477 100644
--- a/drivers/pwm/pwm-tiecap.c
+++ b/drivers/pwm/pwm-tiecap.c
@@ -226,8 +226,6 @@ static int ecap_pwm_probe(struct platform_device *pdev)
 
 	pc->chip.dev = &pdev->dev;
 	pc->chip.ops = &ecap_pwm_ops;
-	pc->chip.of_xlate = of_pwm_xlate_with_flags;
-	pc->chip.of_pwm_n_cells = 3;
 	pc->chip.base = -1;
 	pc->chip.npwm = 1;
 
diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
index cb75133..43c164e 100644
--- a/drivers/pwm/pwm-tiehrpwm.c
+++ b/drivers/pwm/pwm-tiehrpwm.c
@@ -457,8 +457,6 @@ static int ehrpwm_pwm_probe(struct platform_device *pdev)
 
 	pc->chip.dev = &pdev->dev;
 	pc->chip.ops = &ehrpwm_pwm_ops;
-	pc->chip.of_xlate = of_pwm_xlate_with_flags;
-	pc->chip.of_pwm_n_cells = 3;
 	pc->chip.base = -1;
 	pc->chip.npwm = NUM_PWM_CHANNEL;
 
diff --git a/drivers/pwm/pwm-vt8500.c b/drivers/pwm/pwm-vt8500.c
index 652e6b5..234c356 100644
--- a/drivers/pwm/pwm-vt8500.c
+++ b/drivers/pwm/pwm-vt8500.c
@@ -216,8 +216,6 @@ static int vt8500_pwm_probe(struct platform_device *pdev)
 
 	chip->chip.dev = &pdev->dev;
 	chip->chip.ops = &vt8500_pwm_ops;
-	chip->chip.of_xlate = of_pwm_xlate_with_flags;
-	chip->chip.of_pwm_n_cells = 3;
 	chip->chip.base = -1;
 	chip->chip.npwm = VT8500_NR_PWMS;
 
-- 
1.7.10.4

[PATCH 5/5] pwm: remove of_pwm_xlate_with_flags() function

[Vladimir Zapolskiy]

Default of_pwm_simple_xlate() is good enough to replace
of_pwm_xlate_with_flags() function, since the latter has no more
users, remove it from the PWM framework.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Cc: Lothar Waßmann <LW@KARO-electronics.de>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Thierry Reding <thierry.reding@gmail.com>
---
 drivers/pwm/core.c  |   26 --------------------------
 include/linux/pwm.h |    3 ---
 2 files changed, 29 deletions(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 4d9fc7f..33cc1da 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -131,32 +131,6 @@ static int pwm_device_request(struct pwm_device *pwm, const char *label)
 	return 0;
 }
 
-struct pwm_device *
-of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args)
-{
-	struct pwm_device *pwm;
-
-	if (pc->of_pwm_n_cells < 3)
-		return ERR_PTR(-EINVAL);
-
-	if (args->args[0] >= pc->npwm)
-		return ERR_PTR(-EINVAL);
-
-	pwm = pwm_request_from_chip(pc, args->args[0], NULL);
-	if (IS_ERR(pwm))
-		return pwm;
-
-	pwm_set_period(pwm, args->args[1]);
-
-	if (args->args[2] & PWM_POLARITY_INVERTED)
-		pwm_set_polarity(pwm, PWM_POLARITY_INVERSED);
-	else
-		pwm_set_polarity(pwm, PWM_POLARITY_NORMAL);
-
-	return pwm;
-}
-EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags);
-
 static struct pwm_device *
 of_pwm_simple_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
 {
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index e90628c..66f6e7c 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -188,9 +188,6 @@ struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
 					 unsigned int index,
 					 const char *label);
 
-struct pwm_device *of_pwm_xlate_with_flags(struct pwm_chip *pc,
-		const struct of_phandle_args *args);
-
 struct pwm_device *pwm_get(struct device *dev, const char *con_id);
 struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id);
 void pwm_put(struct pwm_device *pwm);
-- 
1.7.10.4

Re: [PATCH v3 0/5] pwm: support backward compatibility of DTB extending PWM args

[Vladimir Zapolskiy]

Hello Thierry,

On 18.11.2014 21:37, Vladimir Zapolskiy wrote:
> Please review this alternative in-house version of supporting backward
> compatibility of DTB files (new kernel/PWM driver and old DTS), overcoming
> a problem that pwms arguments of existing PWM drivers are to be extended
> with polarity field.
> 
> Unfortunately I've firstly created the change and only after that
> found that Lothar Waßmann is working on his version, so I won't insist
> on formal preference, but still I like to share my variant since it
> technically different from Lothar's one.
> 
> Changes from v2 to v3:
> - improved commit messages
> - added two more patches removing of_pwm_xlate_with_flags()
> 
> Changes from v1 to v2:
> - corrected the proper kernel log level, thanks to Lothar Waßmann.
> 
> Vladimir Zapolskiy (5):
>   pwm: process pwm polarity argument in of_pwm_simple_xlate()
>   pwm: push up dynamic printk level on errors in of_pwm_get()
>   pwm: set the actual number of pwms arguments defined in board dts
>   pwm: do not set of_pwm_xlate_with_flags() as a callback
>   pwm: remove of_pwm_xlate_with_flags() function
> 
>  drivers/pwm/core.c            |   42 ++++++++++++-----------------------------
>  drivers/pwm/pwm-atmel-hlcdc.c |    2 --
>  drivers/pwm/pwm-atmel-tcb.c   |    2 --
>  drivers/pwm/pwm-atmel.c       |    6 ------
>  drivers/pwm/pwm-bcm-kona.c    |    2 --
>  drivers/pwm/pwm-fsl-ftm.c     |    2 --
>  drivers/pwm/pwm-renesas-tpu.c |    2 --
>  drivers/pwm/pwm-rockchip.c    |    5 -----
>  drivers/pwm/pwm-samsung.c     |    3 ---
>  drivers/pwm/pwm-tiecap.c      |    2 --
>  drivers/pwm/pwm-tiehrpwm.c    |    2 --
>  drivers/pwm/pwm-vt8500.c      |    2 --
>  include/linux/pwm.h           |    3 ---
>  13 files changed, 12 insertions(+), 63 deletions(-)
> 

could you please review this PWM DTB backward compatibility change?

Thank you in advance.

--
With best wishes,
Vladimir

Re: [PATCH v3 0/5] pwm: support backward compatibility of DTB extending PWM args

[Vladimir Zapolskiy]

Hello Thierry,

On 01.12.2014 16:50, Vladimir Zapolskiy wrote:
> Hello Thierry,
> 
> On 18.11.2014 21:37, Vladimir Zapolskiy wrote:
>> Please review this alternative in-house version of supporting backward
>> compatibility of DTB files (new kernel/PWM driver and old DTS), overcoming
>> a problem that pwms arguments of existing PWM drivers are to be extended
>> with polarity field.
>>
>> Unfortunately I've firstly created the change and only after that
>> found that Lothar Waßmann is working on his version, so I won't insist
>> on formal preference, but still I like to share my variant since it
>> technically different from Lothar's one.
>>
>> Changes from v2 to v3:
>> - improved commit messages
>> - added two more patches removing of_pwm_xlate_with_flags()
>>
>> Changes from v1 to v2:
>> - corrected the proper kernel log level, thanks to Lothar Waßmann.
>>
>> Vladimir Zapolskiy (5):
>>   pwm: process pwm polarity argument in of_pwm_simple_xlate()
>>   pwm: push up dynamic printk level on errors in of_pwm_get()
>>   pwm: set the actual number of pwms arguments defined in board dts
>>   pwm: do not set of_pwm_xlate_with_flags() as a callback
>>   pwm: remove of_pwm_xlate_with_flags() function
>>
>>  drivers/pwm/core.c            |   42 ++++++++++++-----------------------------
>>  drivers/pwm/pwm-atmel-hlcdc.c |    2 --
>>  drivers/pwm/pwm-atmel-tcb.c   |    2 --
>>  drivers/pwm/pwm-atmel.c       |    6 ------
>>  drivers/pwm/pwm-bcm-kona.c    |    2 --
>>  drivers/pwm/pwm-fsl-ftm.c     |    2 --
>>  drivers/pwm/pwm-renesas-tpu.c |    2 --
>>  drivers/pwm/pwm-rockchip.c    |    5 -----
>>  drivers/pwm/pwm-samsung.c     |    3 ---
>>  drivers/pwm/pwm-tiecap.c      |    2 --
>>  drivers/pwm/pwm-tiehrpwm.c    |    2 --
>>  drivers/pwm/pwm-vt8500.c      |    2 --
>>  include/linux/pwm.h           |    3 ---
>>  13 files changed, 12 insertions(+), 63 deletions(-)
>>
> 
> could you please review this PWM DTB backward compatibility change?
> 
> Thank you in advance.
> 

the first three patches are unmodified since October 2014, but still not
reviewed...

Could you please review the changeset?

Thank you in advance.

--
With best wishes,
Vladimir