[PATCH v2 00/28] drivers: Consolidate device lookup helpers

[PATCH v2 00/28] drivers: Consolidate device lookup helpers

[Suzuki K Poulose]

We have device iterators to find a particular device matching a criteria
for a given bus/class/driver. i.e, {bus,class,driver}_find_device() APIs.
The matching criteria is a function pointer for the APIs. Often the lookup
is based on a generic property of a device (e.g, name, fwnode, of node pointer
or device type) rather than a driver specific information. However, each driver
writes up its own "match" function, spilling the similar match functions all
over the driver subsystems.

Additionally the prototype for the "match" functions accepted by the above APIs
have a minute difference which prevents us otherwise sharing the match functions.
i.e,
	int (*match)(struct device *dev, void *data) for {bus/driver}_find_device()
	  vs
	int (*match)(struct device *dev, const void *) for class_find_device()

If we promote the former to accept a "const void*" parameter, we could share one
single match function for all the helpers. This series achieves the following:

 a) [Patches 03-05] Unify the prototype for "match" functions accepted by the
     device lookup APIs.
 b) [Patches 06-11] Introduce generic match functions to match devices by the
     generic attributes of a device (e.g, name, fwnode, of_node and devt).

 c) [Patches 12-27] Also, in order to prevent creation of such match functions
    in the future, we introduce wrapper functions for the look up APIs, which
    automatically uses the appropriate match functions.

    i.e,
	{bus/class/driver}_find_device_by_name
	{bus/class/driver}_find_device_by_of_node
	{bus/class/driver}_find_device_by_fwnode
	{bus/class/driver}_find_device_by_devt
	{bus/class/driver}_find_device_by_acpi_dev
	{bus/class/driver}_find_next_device

     and converts the existing users to switch to the new helpers.

 d) [Patch 28] Additionally, this series also adds wrapper for finding a
    device by matching a device driver for platform bus devices -

		 platform_find_device_by_driver()

    to avoid a few drivers hard coding the platform bus specific details.

Applies on v5.2-rc4, available at [0]

    [0] git://linux-arm.org/linux-skp.git driver-cleanup/v2
RFC [1] https://marc.info/?i=1559577023-558-1-git-send-email-suzuki.poulose@arm.com
V1  [2] https://marc.info/?i=1559747630-28065-1-git-send-email-suzuki.poulose@arm.com

Changes since v1:
 - Drop start parameter for *_find_device_by_devt().
 - Fix build warnings for s390
 - Add *_find_device_by_acpi_dev() wrappers.
 - Group wrappers and the consumers into single patch, reducing
   the total patches to 28 from 57. (Rafael).
 - Better description for acpi cleanup patch.
 - Added tags from v1.

Cc: Alan Tull <atull@kernel.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexander Aring <alex.aring@gmail.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Andreas Noever <andreas.noever@gmail.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Corey Minyard <minyard@acm.org>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Dan Murphy <dmurphy@ti.com>
Cc: David Airlie <airlied@linux.ie>
Cc: David Kershner <david.kershner@unisys.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Doug Ledford <dledford@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Cc: Elie Morisse <syniurge@gmail.com>
Cc: Eric Anholt <eric@anholt.net>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Grant Likely <grant.likely@arm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Harald Freudenberger <freude@linux.ibm.com>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: "Heiko Stübner" <heiko@sntech.de>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Heiner Kallweit <hkallweit1@gmail.com>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Joe Perches <joe@perches.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Len Brown <lenb@kernel.org
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Michael Jamet <michael.jamet@intel.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Moritz Fischer <mdf@kernel.org>
Cc: Nehal Shah <nehal-bakulchandra.shah@amd.com>
Cc: Oliver Neukum <oneukum@suse.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Peter Oberparleiter <oberpar@linux.ibm.com>
Cc: Peter Rosin <peda@axentia.se>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Sandy Huang <hjc@rock-chips.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Sebastian Ott <sebott@linux.ibm.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Shyam Sundar S K <shyam-sundar.s-k@amd.com>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Stefan Schmidt <stefan@datenfreihafen.org>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Thor Thayer <thor.thayer@linux.intel.com>
Cc: Tomas Winkler <tomas.winkler@intel.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: devicetree@vger.kernel.org
Cc: linux-acpi@vger.kernel.org
Cc: linux-fpga@vger.kernel.org
Cc: linux-i2c@vger.kernel.org
Cc: linux-leds@vger.kernel.org
Cc: linux-rockchip@lists.infradead.org
Cc: linux-rtc@vger.kernel.org
Cc: linux-spi@vger.kernel.org
Cc: linux-usb@vger.kernel.org
Cc: linux-wpan@vger.kernel.org

Suzuki K Poulose (28):
  staging: most-core: Use bus_find_device_by_name
  mfd: Remove unused helper syscon_regmap_lookup_by_pdevname
  acpi: utils: Cleanup acpi_dev_match_cb
  bus_find_device: Unify the match callback with class_find_device
  driver_find_device: Unify the match function with class_find_device()
  drivers: Add generic helper to match by of_node
  drivers: Add generic helper to match by fwnode
  drivers: Add generic helper to match by device type
  drivers: Add generic match helper by ACPI_COMPANION device
  drivers: Add generic helper to match by name
  drivers: Add generic helper to match any device
  drivers: Introduce class_find_device_by_name() helper
  drivers: Introduce class_find_device_by_of_node() helper
  drivers: Introduce class_find_device_by_fwnode() helper
  drivers: Introduce class_find_device_by_devt() helper
  drivers: Introduce class_find_device_by_acpi_dev() helper
  drivers: Introduce bus_find_device_by_of_node() helper
  drivers: Introduce bus_find_device_by_fwnode() helper
  drivers: Introduce bus_find_device_by_devt() helper
  drivers: Introduce bus_find_next_device() helper
  drivers: Introduce bus_find_device_by_acpi_dev() helper
  drivers: Introduce driver_find_device_by_name() helper
  drivers: Introduce driver_find_device_by_of_node() helper
  drivers: Introduce driver_find_device_by_fwnode() helper
  drivers: Introduce driver_find_device_by_devt() helper
  drivers: Introduce driver_find_next_device() helper
  drivers: Introduce driver_find_device_by_acpi_dev() helper
  platform: Add platform_find_device_by_driver() helper

 arch/powerpc/platforms/pseries/ibmebus.c           |   4 +-
 drivers/acpi/acpi_lpss.c                           |   4 +-
 drivers/acpi/sleep.c                               |   2 +-
 drivers/acpi/utils.c                               |  11 +-
 drivers/amba/tegra-ahb.c                           |  11 +-
 drivers/base/bus.c                                 |  28 +--
 drivers/base/core.c                                |  45 +++-
 drivers/base/devcon.c                              |   8 +-
 drivers/base/driver.c                              |   4 +-
 drivers/base/platform.c                            |  14 ++
 drivers/char/ipmi/ipmi_msghandler.c                |   8 +-
 drivers/char/ipmi/ipmi_si_platform.c               |   2 +-
 drivers/firmware/efi/dev-path-parser.c             |   4 +-
 drivers/fpga/fpga-bridge.c                         |   8 +-
 drivers/fpga/fpga-mgr.c                            |   8 +-
 drivers/fpga/of-fpga-region.c                      |   7 +-
 drivers/gpu/drm/drm_mipi_dsi.c                     |   7 +-
 drivers/gpu/drm/exynos/exynos_drm_drv.c            |   9 +-
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c        |   3 +-
 drivers/gpu/drm/tegra/dc.c                         |   4 +-
 drivers/gpu/drm/vc4/vc4_drv.c                      |   3 +-
 drivers/hwtracing/coresight/coresight.c            |   6 +-
 drivers/hwtracing/coresight/of_coresight.c         |  11 +-
 drivers/hwtracing/intel_th/core.c                  |  11 +-
 drivers/hwtracing/stm/core.c                       |   9 +-
 drivers/i2c/busses/i2c-amd-mp2-pci.c               |   8 +-
 drivers/i2c/i2c-core-acpi.c                        |  10 +-
 drivers/i2c/i2c-core-of.c                          |   9 +-
 drivers/iio/inkern.c                               |   2 +-
 drivers/infiniband/hw/hns/hns_roce_hw_v1.c         |   8 +-
 drivers/iommu/arm-smmu-v3.c                        |   9 +-
 drivers/iommu/arm-smmu.c                           |   9 +-
 drivers/leds/led-class.c                           |   9 +-
 drivers/mfd/altera-sysmgr.c                        |  14 +-
 drivers/mfd/syscon.c                               |  21 --
 drivers/misc/mei/main.c                            |   9 +-
 drivers/mux/core.c                                 |   7 +-
 drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c |   8 +-
 drivers/net/ethernet/ti/cpsw-phy-sel.c             |   4 +-
 drivers/net/ethernet/ti/davinci_emac.c             |   2 +-
 drivers/net/ethernet/toshiba/tc35815.c             |   4 +-
 drivers/net/phy/mdio_bus.c                         |   9 +-
 drivers/nvmem/core.c                               |   7 +-
 drivers/of/of_mdio.c                               |   8 +-
 drivers/of/platform.c                              |   7 +-
 drivers/pci/probe.c                                |   7 +-
 drivers/pci/search.c                               |   4 +-
 drivers/regulator/of_regulator.c                   |   7 +-
 drivers/rtc/interface.c                            |  11 +-
 drivers/s390/cio/ccwgroup.c                        |  18 +-
 drivers/s390/cio/chsc_sch.c                        |   2 +-
 drivers/s390/cio/css.c                             |   4 +-
 drivers/s390/cio/device.c                          |  21 +-
 drivers/s390/cio/scm.c                             |   4 +-
 drivers/s390/crypto/ap_bus.c                       |   8 +-
 drivers/s390/crypto/zcrypt_api.c                   |  22 +-
 drivers/scsi/scsi_proc.c                           |   9 +-
 drivers/spi/spi.c                                  |  28 +--
 drivers/staging/most/core.c                        |   9 +-
 drivers/thunderbolt/switch.c                       |   4 +-
 drivers/tty/tty_io.c                               |   8 +-
 drivers/usb/core/devio.c                           |   8 +-
 drivers/usb/core/usb.c                             |   4 +-
 drivers/usb/phy/phy-am335x-control.c               |   4 +-
 drivers/usb/phy/phy-isp1301.c                      |   4 +-
 drivers/usb/roles/class.c                          |  16 +-
 drivers/usb/typec/class.c                          |  16 +-
 drivers/visorbus/visorbus_main.c                   |   4 +-
 include/linux/device.h                             | 247 ++++++++++++++++++++-
 include/linux/mfd/syscon.h                         |   6 -
 include/linux/platform_device.h                    |   3 +
 net/ieee802154/core.c                              |   7 +-
 sound/soc/rockchip/rk3399_gru_sound.c              |   9 +-
 73 files changed, 407 insertions(+), 482 deletions(-)

-- 
2.7.4

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[PATCH v2 17/28] drivers: Introduce bus_find_device_by_of_node() helper

[Suzuki K Poulose]

Add a wrapper to bus_find_device() to search for a device
by the of_node pointer, reusing the generic match function.
Also convert the existing users to make use of the new helper.

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: dri-devel@lists.freedesktop.org
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: devicetree@vger.kernel.org
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: linux-i2c@vger.kernel.org
Cc: linux-rockchip@lists.infradead.org
Cc: linux-spi@vger.kernel.org
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/gpu/drm/drm_mipi_dsi.c             |  7 +------
 drivers/hwtracing/coresight/of_coresight.c | 11 ++---------
 drivers/i2c/i2c-core-of.c                  |  7 +------
 drivers/nvmem/core.c                       |  7 +------
 drivers/of/of_mdio.c                       |  8 +-------
 drivers/of/platform.c                      |  7 +------
 drivers/spi/spi.c                          |  9 ++-------
 include/linux/device.h                     | 12 ++++++++++++
 sound/soc/rockchip/rk3399_gru_sound.c      |  9 ++-------
 9 files changed, 23 insertions(+), 54 deletions(-)

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index ad19df0..bd2498b 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -93,11 +93,6 @@ static struct bus_type mipi_dsi_bus_type = {
 	.pm = &mipi_dsi_device_pm_ops,
 };
 
-static int of_device_match(struct device *dev, const void *data)
-{
-	return dev->of_node == data;
-}
-
 /**
  * of_find_mipi_dsi_device_by_node() - find the MIPI DSI device matching a
  *    device tree node
@@ -110,7 +105,7 @@ struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np)
 {
 	struct device *dev;
 
-	dev = bus_find_device(&mipi_dsi_bus_type, NULL, np, of_device_match);
+	dev = bus_find_device_by_of_node(&mipi_dsi_bus_type, np);
 
 	return dev ? to_mipi_dsi_device(dev) : NULL;
 }
diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
index 3fc200e..f417f76 100644
--- a/drivers/hwtracing/coresight/of_coresight.c
+++ b/drivers/hwtracing/coresight/of_coresight.c
@@ -18,11 +18,6 @@
 #include <asm/smp_plat.h>
 
 
-static int of_dev_node_match(struct device *dev, const void *data)
-{
-	return dev->of_node == data;
-}
-
 static struct device *
 of_coresight_get_endpoint_device(struct device_node *endpoint)
 {
@@ -32,8 +27,7 @@ of_coresight_get_endpoint_device(struct device_node *endpoint)
 	 * If we have a non-configurable replicator, it will be found on the
 	 * platform bus.
 	 */
-	dev = bus_find_device(&platform_bus_type, NULL,
-			      endpoint, of_dev_node_match);
+	dev = bus_find_device_by_of_node(&platform_bus_type, endpoint);
 	if (dev)
 		return dev;
 
@@ -41,8 +35,7 @@ of_coresight_get_endpoint_device(struct device_node *endpoint)
 	 * We have a configurable component - circle through the AMBA bus
 	 * looking for the device that matches the endpoint node.
 	 */
-	return bus_find_device(&amba_bustype, NULL,
-			       endpoint, of_dev_node_match);
+	return bus_find_device_by_of_node(&amba_bustype, endpoint);
 }
 
 static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep)
diff --git a/drivers/i2c/i2c-core-of.c b/drivers/i2c/i2c-core-of.c
index 2eb59a2..74a4126 100644
--- a/drivers/i2c/i2c-core-of.c
+++ b/drivers/i2c/i2c-core-of.c
@@ -112,11 +112,6 @@ void of_i2c_register_devices(struct i2c_adapter *adap)
 	of_node_put(bus);
 }
 
-static int of_dev_node_match(struct device *dev, const void *data)
-{
-	return dev->of_node == data;
-}
-
 static int of_dev_or_parent_node_match(struct device *dev, const void *data)
 {
 	if (dev->of_node == data)
@@ -134,7 +129,7 @@ struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
 	struct device *dev;
 	struct i2c_client *client;
 
-	dev = bus_find_device(&i2c_bus_type, NULL, node, of_dev_node_match);
+	dev = bus_find_device_by_of_node(&i2c_bus_type, node);
 	if (!dev)
 		return NULL;
 
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index ac5d945..057d1ff 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -76,11 +76,6 @@ static struct bus_type nvmem_bus_type = {
 	.name		= "nvmem",
 };
 
-static int of_nvmem_match(struct device *dev, const void *nvmem_np)
-{
-	return dev->of_node == nvmem_np;
-}
-
 static struct nvmem_device *of_nvmem_find(struct device_node *nvmem_np)
 {
 	struct device *d;
@@ -88,7 +83,7 @@ static struct nvmem_device *of_nvmem_find(struct device_node *nvmem_np)
 	if (!nvmem_np)
 		return NULL;
 
-	d = bus_find_device(&nvmem_bus_type, NULL, nvmem_np, of_nvmem_match);
+	d = bus_find_device_by_of_node(&nvmem_bus_type, nvmem_np);
 
 	if (!d)
 		return NULL;
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 44f5349..000b957 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -280,12 +280,6 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
 }
 EXPORT_SYMBOL(of_mdiobus_register);
 
-/* Helper function for of_phy_find_device */
-static int of_phy_match(struct device *dev, const void *phy_np)
-{
-	return dev->of_node == phy_np;
-}
-
 /**
  * of_phy_find_device - Give a PHY node, find the phy_device
  * @phy_np: Pointer to the phy's device tree node
@@ -301,7 +295,7 @@ struct phy_device *of_phy_find_device(struct device_node *phy_np)
 	if (!phy_np)
 		return NULL;
 
-	d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
+	d = bus_find_device_by_of_node(&mdio_bus_type, phy_np);
 	if (d) {
 		mdiodev = to_mdio_device(d);
 		if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 008d79e..de11905 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -37,11 +37,6 @@ static const struct of_device_id of_skipped_node_table[] = {
 	{} /* Empty terminated list */
 };
 
-static int of_dev_node_match(struct device *dev, const void *data)
-{
-	return dev->of_node == data;
-}
-
 /**
  * of_find_device_by_node - Find the platform_device associated with a node
  * @np: Pointer to device tree node
@@ -55,7 +50,7 @@ struct platform_device *of_find_device_by_node(struct device_node *np)
 {
 	struct device *dev;
 
-	dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match);
+	dev = bus_find_device_by_of_node(&platform_bus_type, np);
 	return dev ? to_platform_device(dev) : NULL;
 }
 EXPORT_SYMBOL(of_find_device_by_node);
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index a256be5..cc4d83e 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -3538,16 +3538,11 @@ EXPORT_SYMBOL_GPL(spi_write_then_read);
 /*-------------------------------------------------------------------------*/
 
 #if IS_ENABLED(CONFIG_OF)
-static int __spi_of_device_match(struct device *dev, const void *data)
-{
-	return dev->of_node == data;
-}
-
 /* must call put_device() when done with returned spi_device device */
 struct spi_device *of_find_spi_device_by_node(struct device_node *node)
 {
-	struct device *dev = bus_find_device(&spi_bus_type, NULL, node,
-						__spi_of_device_match);
+	struct device *dev = bus_find_device_by_of_node(&spi_bus_type, node);
+
 	return dev ? to_spi_device(dev) : NULL;
 }
 EXPORT_SYMBOL_GPL(of_find_spi_device_by_node);
diff --git a/include/linux/device.h b/include/linux/device.h
index b1b8c90..35f51d6 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -189,6 +189,18 @@ static inline struct device *bus_find_device_by_name(struct bus_type *bus,
 	return bus_find_device(bus, start, name, device_match_name);
 }
 
+/**
+ * bus_find_device_by_of_node : device iterator for locating a particular device
+ * matching the of_node.
+ * @bus: bus type
+ * @np: of_node of the device to match.
+ */
+static inline struct device *
+bus_find_device_by_of_node(struct bus_type *bus, const struct device_node *np)
+{
+	return bus_find_device(bus, NULL, np, device_match_of_node);
+}
+
 struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
 					struct device *hint);
 int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
diff --git a/sound/soc/rockchip/rk3399_gru_sound.c b/sound/soc/rockchip/rk3399_gru_sound.c
index c04c9ed..2fb7f8e 100644
--- a/sound/soc/rockchip/rk3399_gru_sound.c
+++ b/sound/soc/rockchip/rk3399_gru_sound.c
@@ -405,11 +405,6 @@ static const struct dailink_match_data dailink_match[] = {
 	},
 };
 
-static int of_dev_node_match(struct device *dev, const void *data)
-{
-	return dev->of_node == data;
-}
-
 static int rockchip_sound_codec_node_match(struct device_node *np_codec)
 {
 	struct device *dev;
@@ -421,8 +416,8 @@ static int rockchip_sound_codec_node_match(struct device_node *np_codec)
 			continue;
 
 		if (dailink_match[i].bus_type) {
-			dev = bus_find_device(dailink_match[i].bus_type, NULL,
-					      np_codec, of_dev_node_match);
+			dev = bus_find_device_by_of_node(dailink_match[i].bus_type,
+							 np_codec);
 			if (!dev)
 				continue;
 			put_device(dev);
-- 
2.7.4

Re: [PATCH v2 17/28] drivers: Introduce bus_find_device_by_of_node() helper

[Wolfram Sang]

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On Fri, Jun 14, 2019 at 06:54:12PM +0100, Suzuki K Poulose wrote:
> Add a wrapper to bus_find_device() to search for a device
> by the of_node pointer, reusing the generic match function.
> Also convert the existing users to make use of the new helper.
> 
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maxime Ripard <maxime.ripard@bootlin.com>
> Cc: dri-devel@lists.freedesktop.org
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: devicetree@vger.kernel.org
> Cc: Florian Fainelli <f.fainelli@gmail.com>
> Cc: Frank Rowand <frowand.list@gmail.com>
> Cc: Heiko Stuebner <heiko@sntech.de>
> Cc: Liam Girdwood <lgirdwood@gmail.com>
> Cc: linux-i2c@vger.kernel.org
> Cc: linux-rockchip@lists.infradead.org
> Cc: linux-spi@vger.kernel.org
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> Cc: Takashi Iwai <tiwai@suse.com>
> Cc: Wolfram Sang <wsa@the-dreams.de>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>

Acked-by: Wolfram Sang <wsa@the-dreams.de> # for the I2C parts


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[-- Attachment #2: Type: text/plain, Size: 159 bytes --]

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Re: [PATCH v2 00/28] drivers: Consolidate device lookup helpers

[Greg KH]

On Fri, Jun 14, 2019 at 06:53:55PM +0100, Suzuki K Poulose wrote:
> We have device iterators to find a particular device matching a criteria
> for a given bus/class/driver. i.e, {bus,class,driver}_find_device() APIs.
> The matching criteria is a function pointer for the APIs. Often the lookup
> is based on a generic property of a device (e.g, name, fwnode, of node pointer
> or device type) rather than a driver specific information. However, each driver
> writes up its own "match" function, spilling the similar match functions all
> over the driver subsystems.
> 
> Additionally the prototype for the "match" functions accepted by the above APIs
> have a minute difference which prevents us otherwise sharing the match functions.
> i.e,
> 	int (*match)(struct device *dev, void *data) for {bus/driver}_find_device()
> 	  vs
> 	int (*match)(struct device *dev, const void *) for class_find_device()
> 
> If we promote the former to accept a "const void*" parameter, we could share one
> single match function for all the helpers. This series achieves the following:
> 
>  a) [Patches 03-05] Unify the prototype for "match" functions accepted by the
>      device lookup APIs.

I've applied the first 6 patches of this series to my tree now.  Let's
see how that goes, and this should give you a more solid base to redo
the rest of the series off of.

thanks,

greg k-h
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Re: [PATCH v2 17/28] drivers: Introduce bus_find_device_by_of_node() helper

[Rob Herring]

On Fri, 14 Jun 2019 18:54:12 +0100, Suzuki K Poulose wrote:
> Add a wrapper to bus_find_device() to search for a device
> by the of_node pointer, reusing the generic match function.
> Also convert the existing users to make use of the new helper.
> 
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maxime Ripard <maxime.ripard@bootlin.com>
> Cc: dri-devel@lists.freedesktop.org
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: devicetree@vger.kernel.org
> Cc: Florian Fainelli <f.fainelli@gmail.com>
> Cc: Frank Rowand <frowand.list@gmail.com>
> Cc: Heiko Stuebner <heiko@sntech.de>
> Cc: Liam Girdwood <lgirdwood@gmail.com>
> Cc: linux-i2c@vger.kernel.org
> Cc: linux-rockchip@lists.infradead.org
> Cc: linux-spi@vger.kernel.org
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> Cc: Takashi Iwai <tiwai@suse.com>
> Cc: Wolfram Sang <wsa@the-dreams.de>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  drivers/gpu/drm/drm_mipi_dsi.c             |  7 +------
>  drivers/hwtracing/coresight/of_coresight.c | 11 ++---------
>  drivers/i2c/i2c-core-of.c                  |  7 +------
>  drivers/nvmem/core.c                       |  7 +------
>  drivers/of/of_mdio.c                       |  8 +-------
>  drivers/of/platform.c                      |  7 +------
>  drivers/spi/spi.c                          |  9 ++-------
>  include/linux/device.h                     | 12 ++++++++++++
>  sound/soc/rockchip/rk3399_gru_sound.c      |  9 ++-------
>  9 files changed, 23 insertions(+), 54 deletions(-)
> 

Reviewed-by: Rob Herring <robh@kernel.org>