[PATCH v3 2/7] drivers: Introduce device lookup variants by of_node

[PATCH v3 2/7] drivers: Introduce device lookup variants by of_node

[Suzuki K Poulose]

Introduce wrappers for {bus/driver/class}_find_device() to
locate devices by its of_node.

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: Alan Tull <atull@kernel.org>
Cc: Moritz Fischer <mdf@kernel.org>
Cc: linux-fpga@vger.kernel.org
Cc: Peter Rosin <peda@axentia.se>
Cc: Mark Brown <broonie@kernel.org>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Heiner Kallweit <hkallweit1@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Thor Thayer <thor.thayer@linux.intel.com>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Peter Rosin <peda@axentia.se>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 - Dropped the reviewed-by tags from Thor, Mark, Andrew and Peter as the
   patches are mereged, though there are no functional changes.
---
 drivers/amba/tegra-ahb.c              | 11 +-------
 drivers/fpga/fpga-bridge.c            |  8 +-----
 drivers/fpga/fpga-mgr.c               |  8 +-----
 drivers/gpu/drm/drm_mipi_dsi.c        |  7 +----
 drivers/i2c/i2c-core-of.c             |  7 +----
 drivers/mfd/altera-sysmgr.c           | 14 ++--------
 drivers/mux/core.c                    |  7 +----
 drivers/net/phy/mdio_bus.c            |  9 +------
 drivers/nvmem/core.c                  |  7 +----
 drivers/of/of_mdio.c                  |  8 +-----
 drivers/of/platform.c                 |  7 +----
 drivers/regulator/of_regulator.c      |  7 +----
 drivers/spi/spi.c                     | 20 +++------------
 include/linux/device.h                | 37 +++++++++++++++++++++++++++
 sound/soc/rockchip/rk3399_gru_sound.c |  9 ++-----
 15 files changed, 56 insertions(+), 110 deletions(-)

diff --git a/drivers/amba/tegra-ahb.c b/drivers/amba/tegra-ahb.c
index aa64eece77a6..57d3b2e2d007 100644
--- a/drivers/amba/tegra-ahb.c
+++ b/drivers/amba/tegra-ahb.c
@@ -134,22 +134,13 @@ static inline void gizmo_writel(struct tegra_ahb *ahb, u32 value, u32 offset)
 }
 
 #ifdef CONFIG_TEGRA_IOMMU_SMMU
-static int tegra_ahb_match_by_smmu(struct device *dev, const void *data)
-{
-	struct tegra_ahb *ahb = dev_get_drvdata(dev);
-	const struct device_node *dn = data;
-
-	return (ahb->dev->of_node == dn) ? 1 : 0;
-}
-
 int tegra_ahb_enable_smmu(struct device_node *dn)
 {
 	struct device *dev;
 	u32 val;
 	struct tegra_ahb *ahb;
 
-	dev = driver_find_device(&tegra_ahb_driver.driver, NULL, dn,
-				 tegra_ahb_match_by_smmu);
+	dev = driver_find_device_by_of_node(&tegra_ahb_driver.driver, dn);
 	if (!dev)
 		return -EPROBE_DEFER;
 	ahb = dev_get_drvdata(dev);
diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c
index 80bd8f1b2aa6..4bab9028940a 100644
--- a/drivers/fpga/fpga-bridge.c
+++ b/drivers/fpga/fpga-bridge.c
@@ -19,11 +19,6 @@ static struct class *fpga_bridge_class;
 /* Lock for adding/removing bridges to linked lists*/
 static spinlock_t bridge_list_lock;
 
-static int fpga_bridge_of_node_match(struct device *dev, const void *data)
-{
-	return dev->of_node == data;
-}
-
 /**
  * fpga_bridge_enable - Enable transactions on the bridge
  *
@@ -104,8 +99,7 @@ struct fpga_bridge *of_fpga_bridge_get(struct device_node *np,
 {
 	struct device *dev;
 
-	dev = class_find_device(fpga_bridge_class, NULL, np,
-				fpga_bridge_of_node_match);
+	dev = class_find_device_by_of_node(fpga_bridge_class, np);
 	if (!dev)
 		return ERR_PTR(-ENODEV);
 
diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
index c3866816456a..e05104f5e40c 100644
--- a/drivers/fpga/fpga-mgr.c
+++ b/drivers/fpga/fpga-mgr.c
@@ -482,11 +482,6 @@ struct fpga_manager *fpga_mgr_get(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(fpga_mgr_get);
 
-static int fpga_mgr_of_node_match(struct device *dev, const void *data)
-{
-	return dev->of_node == data;
-}
-
 /**
  * of_fpga_mgr_get - Given a device node, get a reference to a fpga mgr.
  *
@@ -498,8 +493,7 @@ struct fpga_manager *of_fpga_mgr_get(struct device_node *node)
 {
 	struct device *dev;
 
-	dev = class_find_device(fpga_mgr_class, NULL, node,
-				fpga_mgr_of_node_match);
+	dev = class_find_device_by_of_node(fpga_mgr_class, node);
 	if (!dev)
 		return ERR_PTR(-ENODEV);
 
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index ad19df0686c9..bd2498bbd74a 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/i2c/i2c-core-of.c b/drivers/i2c/i2c-core-of.c
index d1c48dec7118..6f632d543fcc 100644
--- a/drivers/i2c/i2c-core-of.c
+++ b/drivers/i2c/i2c-core-of.c
@@ -113,11 +113,6 @@ 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)
@@ -135,7 +130,7 @@ 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/mfd/altera-sysmgr.c b/drivers/mfd/altera-sysmgr.c
index 2ee14d8a6d31..d2a13a547a3c 100644
--- a/drivers/mfd/altera-sysmgr.c
+++ b/drivers/mfd/altera-sysmgr.c
@@ -87,16 +87,6 @@ static struct regmap_config altr_sysmgr_regmap_cfg = {
 	.use_single_write = true,
 };
 
-/**
- * sysmgr_match_phandle
- * Matching function used by driver_find_device().
- * Return: True if match is found, otherwise false.
- */
-static int sysmgr_match_phandle(struct device *dev, const void *data)
-{
-	return dev->of_node == (const struct device_node *)data;
-}
-
 /**
  * altr_sysmgr_regmap_lookup_by_phandle
  * Find the sysmgr previous configured in probe() and return regmap property.
@@ -117,8 +107,8 @@ struct regmap *altr_sysmgr_regmap_lookup_by_phandle(struct device_node *np,
 	if (!sysmgr_np)
 		return ERR_PTR(-ENODEV);
 
-	dev = driver_find_device(&altr_sysmgr_driver.driver, NULL,
-				 (void *)sysmgr_np, sysmgr_match_phandle);
+	dev = driver_find_device_by_of_node(&altr_sysmgr_driver.driver,
+					    (void *)sysmgr_np);
 	of_node_put(sysmgr_np);
 	if (!dev)
 		return ERR_PTR(-EPROBE_DEFER);
diff --git a/drivers/mux/core.c b/drivers/mux/core.c
index d1271c1ee23c..1fb22388e7e0 100644
--- a/drivers/mux/core.c
+++ b/drivers/mux/core.c
@@ -405,17 +405,12 @@ int mux_control_deselect(struct mux_control *mux)
 }
 EXPORT_SYMBOL_GPL(mux_control_deselect);
 
-static int of_dev_node_match(struct device *dev, const void *data)
-{
-	return dev->of_node == data;
-}
-
 /* Note this function returns a reference to the mux_chip dev. */
 static struct mux_chip *of_find_mux_chip_by_node(struct device_node *np)
 {
 	struct device *dev;
 
-	dev = class_find_device(&mux_class, NULL, np, of_dev_node_match);
+	dev = class_find_device_by_of_node(&mux_class, np);
 
 	return dev ? to_mux_chip(dev) : NULL;
 }
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index bd04fe762056..ce940871331e 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -262,11 +262,6 @@ static struct class mdio_bus_class = {
 };
 
 #if IS_ENABLED(CONFIG_OF_MDIO)
-/* Helper function for of_mdio_find_bus */
-static int of_mdio_bus_match(struct device *dev, const void *mdio_bus_np)
-{
-	return dev->of_node == mdio_bus_np;
-}
 /**
  * of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
  * @mdio_bus_np: Pointer to the mii_bus.
@@ -287,9 +282,7 @@ struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
 	if (!mdio_bus_np)
 		return NULL;
 
-	d = class_find_device(&mdio_bus_class, NULL,  mdio_bus_np,
-			      of_mdio_bus_match);
-
+	d = class_find_device_by_of_node(&mdio_bus_class, mdio_bus_np);
 	return d ? to_mii_bus(d) : NULL;
 }
 EXPORT_SYMBOL(of_mdio_find_bus);
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index ac5d945be88a..057d1ff87d5d 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 44f53496cab1..000b95787df1 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 7801e25e6895..b47a2292fe8e 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/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 397918ebba55..20dcc9c03adc 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -460,16 +460,11 @@ struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
 	return NULL;
 }
 
-static int of_node_match(struct device *dev, const void *data)
-{
-	return dev->of_node == data;
-}
-
 struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
 {
 	struct device *dev;
 
-	dev = class_find_device(&regulator_class, NULL, np, of_node_match);
+	dev = class_find_device_by_of_node(&regulator_class, np);
 
 	return dev ? dev_to_rdev(dev) : NULL;
 }
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 75ac046cae52..a591da87981a 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -3652,37 +3652,25 @@ 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);
 #endif /* IS_ENABLED(CONFIG_OF) */
 
 #if IS_ENABLED(CONFIG_OF_DYNAMIC)
-static int __spi_of_controller_match(struct device *dev, const void *data)
-{
-	return dev->of_node == data;
-}
-
 /* the spi controllers are not using spi_bus, so we find it with another way */
 static struct spi_controller *of_find_spi_controller_by_node(struct device_node *node)
 {
 	struct device *dev;
 
-	dev = class_find_device(&spi_master_class, NULL, node,
-				__spi_of_controller_match);
+	dev = class_find_device_by_of_node(&spi_master_class, node);
 	if (!dev && IS_ENABLED(CONFIG_SPI_SLAVE))
-		dev = class_find_device(&spi_slave_class, NULL, node,
-					__spi_of_controller_match);
+		dev = class_find_device_by_of_node(&spi_slave_class, node);
 	if (!dev)
 		return NULL;
 
diff --git a/include/linux/device.h b/include/linux/device.h
index 3ba376b8b456..29d8d7ad41e6 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -186,6 +186,18 @@ 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,
@@ -366,6 +378,19 @@ static inline struct device *driver_find_device_by_name(struct device_driver *dr
 	return driver_find_device(drv, NULL, name, device_match_name);
 }
 
+/**
+ * driver_find_device_by_of_node- device iterator for locating a particular device
+ * by of_node pointer.
+ * @driver: the driver we're iterating
+ * @np: of_node pointer to match.
+ */
+static inline struct device *
+driver_find_device_by_of_node(struct device_driver *drv,
+			      const struct device_node *np)
+{
+	return driver_find_device(drv, NULL, np, device_match_of_node);
+}
+
 void driver_deferred_probe_add(struct device *dev);
 int driver_deferred_probe_check_state(struct device *dev);
 int driver_deferred_probe_check_state_continue(struct device *dev);
@@ -507,6 +532,18 @@ static inline struct device *class_find_device_by_name(struct class *class,
 	return class_find_device(class, NULL, name, device_match_name);
 }
 
+/**
+ * class_find_device_by_of_node : device iterator for locating a particular device
+ * matching the of_node.
+ * @class: class type
+ * @np: of_node of the device to match.
+ */
+static inline struct device *
+class_find_device_by_of_node(struct class *class, const struct device_node *np)
+{
+	return class_find_device(class, NULL, np, device_match_of_node);
+}
+
 struct class_attribute {
 	struct attribute attr;
 	ssize_t (*show)(struct class *class, struct class_attribute *attr,
diff --git a/sound/soc/rockchip/rk3399_gru_sound.c b/sound/soc/rockchip/rk3399_gru_sound.c
index c16b0ffe8cfc..d951100bf770 100644
--- a/sound/soc/rockchip/rk3399_gru_sound.c
+++ b/sound/soc/rockchip/rk3399_gru_sound.c
@@ -422,11 +422,6 @@ 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;
@@ -438,8 +433,8 @@ 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);
-- 
2.21.0

Re: [PATCH v3 2/7] drivers: Introduce device lookup variants by of_node

[Lee Jones]

On Tue, 23 Jul 2019, Suzuki K Poulose wrote:

> Introduce wrappers for {bus/driver/class}_find_device() to
> locate devices by its of_node.
> 
> 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: Alan Tull <atull@kernel.org>
> Cc: Moritz Fischer <mdf@kernel.org>
> Cc: linux-fpga@vger.kernel.org
> Cc: Peter Rosin <peda@axentia.se>
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Florian Fainelli <f.fainelli@gmail.com>
> Cc: Heiner Kallweit <hkallweit1@gmail.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Andrew Lunn <andrew@lunn.ch>
> Cc: Liam Girdwood <lgirdwood@gmail.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Thor Thayer <thor.thayer@linux.intel.com>
> Cc: Jiri Slaby <jslaby@suse.com>
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Andrew Lunn <andrew@lunn.ch>
> Cc: Peter Rosin <peda@axentia.se>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  - Dropped the reviewed-by tags from Thor, Mark, Andrew and Peter as the
>    patches are mereged, though there are no functional changes.
> ---
>  drivers/amba/tegra-ahb.c              | 11 +-------
>  drivers/fpga/fpga-bridge.c            |  8 +-----
>  drivers/fpga/fpga-mgr.c               |  8 +-----
>  drivers/gpu/drm/drm_mipi_dsi.c        |  7 +----
>  drivers/i2c/i2c-core-of.c             |  7 +----
>  drivers/mfd/altera-sysmgr.c           | 14 ++--------

For my own reference:
  Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>

What's the merge plan for this patch?

Is anyone prepared to create an immutable branch for us to pull from?
I'm happy to do it if no one else steps up.

>  drivers/mux/core.c                    |  7 +----
>  drivers/net/phy/mdio_bus.c            |  9 +------
>  drivers/nvmem/core.c                  |  7 +----
>  drivers/of/of_mdio.c                  |  8 +-----
>  drivers/of/platform.c                 |  7 +----
>  drivers/regulator/of_regulator.c      |  7 +----
>  drivers/spi/spi.c                     | 20 +++------------
>  include/linux/device.h                | 37 +++++++++++++++++++++++++++
>  sound/soc/rockchip/rk3399_gru_sound.c |  9 ++-----
>  15 files changed, 56 insertions(+), 110 deletions(-)

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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Re: [PATCH v3 0/7] drivers: Add generic device lookup helpers

[Greg KH]

On Tue, Jul 23, 2019 at 11:18:31PM +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.
> 
> This series adds device match helpers by generic device properties of a device.
> Using these generic match functions, introduce wrappers to the existing
>  *_find_device() helpers and converts the existing users to use the new wrappers.
>  i.e,
> 	{bus/class/driver}_find_device_by_name()
> 	{bus/class/driver}_find_device_by_fwnode()
> 	{bus/class/driver}_find_device_by_devt()
> 	{bus/class/driver}_find_device_by_acpi_dev()
> 
> Also adds a wrapper for finding a platform device by driver, to avoid
> spilling the platform_bus internals in the individual drivers. Applies
> on 5.3-rc1.
> 
>    [0] git://linux-arm.org/linux-skp.git driver-cleanup/v3
> 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
> V2 [3] https://marc.info/?i=1560534863-15115-1-git-send-email-suzuki.poulose@arm.com
> 
> Changes since v2:
>  - Merge the device match helper introduction patch with the variants
>    of the helpers, for better review.
>  - Use platform_find_device_by_driver for mcde drm driver.

This looks good to me at first glance, thanks for doing this work.

I'll wait a few days to collect acks from various subsystem maintainers
before taking the series in my tree.

thanks,

greg k-h
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Re: [PATCH v3 2/7] drivers: Introduce device lookup variants by of_node

[Wolfram Sang]

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On Tue, Jul 23, 2019 at 11:18:33PM +0100, Suzuki K Poulose wrote:
> Introduce wrappers for {bus/driver/class}_find_device() to
> locate devices by its of_node.
> 
> 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: Alan Tull <atull@kernel.org>
> Cc: Moritz Fischer <mdf@kernel.org>
> Cc: linux-fpga@vger.kernel.org
> Cc: Peter Rosin <peda@axentia.se>
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Florian Fainelli <f.fainelli@gmail.com>
> Cc: Heiner Kallweit <hkallweit1@gmail.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Andrew Lunn <andrew@lunn.ch>
> Cc: Liam Girdwood <lgirdwood@gmail.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Thor Thayer <thor.thayer@linux.intel.com>
> Cc: Jiri Slaby <jslaby@suse.com>
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Andrew Lunn <andrew@lunn.ch>
> Cc: Peter Rosin <peda@axentia.se>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  - Dropped the reviewed-by tags from Thor, Mark, Andrew and Peter as the
>    patches are mereged, though there are no functional changes.

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


[-- Attachment #2: signature.asc --]
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Re: [PATCH v3 2/7] drivers: Introduce device lookup variants by of_node

[Moritz Fischer]

On Tue, Jul 23, 2019 at 11:18:33PM +0100, Suzuki K Poulose wrote:
> Introduce wrappers for {bus/driver/class}_find_device() to
> locate devices by its of_node.
> 
> 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: Alan Tull <atull@kernel.org>
> Cc: Moritz Fischer <mdf@kernel.org>
> Cc: linux-fpga@vger.kernel.org
> Cc: Peter Rosin <peda@axentia.se>
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Florian Fainelli <f.fainelli@gmail.com>
> Cc: Heiner Kallweit <hkallweit1@gmail.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Andrew Lunn <andrew@lunn.ch>
> Cc: Liam Girdwood <lgirdwood@gmail.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Thor Thayer <thor.thayer@linux.intel.com>
> Cc: Jiri Slaby <jslaby@suse.com>
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Andrew Lunn <andrew@lunn.ch>
> Cc: Peter Rosin <peda@axentia.se>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>

Acked-by: Moritz Fischer <mdf@kernel.org> # For FPGA part

> ---
>  - Dropped the reviewed-by tags from Thor, Mark, Andrew and Peter as the
>    patches are mereged, though there are no functional changes.
> ---
>  drivers/amba/tegra-ahb.c              | 11 +-------
>  drivers/fpga/fpga-bridge.c            |  8 +-----
>  drivers/fpga/fpga-mgr.c               |  8 +-----
>  drivers/gpu/drm/drm_mipi_dsi.c        |  7 +----
>  drivers/i2c/i2c-core-of.c             |  7 +----
>  drivers/mfd/altera-sysmgr.c           | 14 ++--------
>  drivers/mux/core.c                    |  7 +----
>  drivers/net/phy/mdio_bus.c            |  9 +------
>  drivers/nvmem/core.c                  |  7 +----
>  drivers/of/of_mdio.c                  |  8 +-----
>  drivers/of/platform.c                 |  7 +----
>  drivers/regulator/of_regulator.c      |  7 +----
>  drivers/spi/spi.c                     | 20 +++------------
>  include/linux/device.h                | 37 +++++++++++++++++++++++++++
>  sound/soc/rockchip/rk3399_gru_sound.c |  9 ++-----
>  15 files changed, 56 insertions(+), 110 deletions(-)
> 
> diff --git a/drivers/amba/tegra-ahb.c b/drivers/amba/tegra-ahb.c
> index aa64eece77a6..57d3b2e2d007 100644
> --- a/drivers/amba/tegra-ahb.c
> +++ b/drivers/amba/tegra-ahb.c
> @@ -134,22 +134,13 @@ static inline void gizmo_writel(struct tegra_ahb *ahb, u32 value, u32 offset)
>  }
>  
>  #ifdef CONFIG_TEGRA_IOMMU_SMMU
> -static int tegra_ahb_match_by_smmu(struct device *dev, const void *data)
> -{
> -	struct tegra_ahb *ahb = dev_get_drvdata(dev);
> -	const struct device_node *dn = data;
> -
> -	return (ahb->dev->of_node == dn) ? 1 : 0;
> -}
> -
>  int tegra_ahb_enable_smmu(struct device_node *dn)
>  {
>  	struct device *dev;
>  	u32 val;
>  	struct tegra_ahb *ahb;
>  
> -	dev = driver_find_device(&tegra_ahb_driver.driver, NULL, dn,
> -				 tegra_ahb_match_by_smmu);
> +	dev = driver_find_device_by_of_node(&tegra_ahb_driver.driver, dn);
>  	if (!dev)
>  		return -EPROBE_DEFER;
>  	ahb = dev_get_drvdata(dev);
> diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c
> index 80bd8f1b2aa6..4bab9028940a 100644
> --- a/drivers/fpga/fpga-bridge.c
> +++ b/drivers/fpga/fpga-bridge.c
> @@ -19,11 +19,6 @@ static struct class *fpga_bridge_class;
>  /* Lock for adding/removing bridges to linked lists*/
>  static spinlock_t bridge_list_lock;
>  
> -static int fpga_bridge_of_node_match(struct device *dev, const void *data)
> -{
> -	return dev->of_node == data;
> -}
> -
>  /**
>   * fpga_bridge_enable - Enable transactions on the bridge
>   *
> @@ -104,8 +99,7 @@ struct fpga_bridge *of_fpga_bridge_get(struct device_node *np,
>  {
>  	struct device *dev;
>  
> -	dev = class_find_device(fpga_bridge_class, NULL, np,
> -				fpga_bridge_of_node_match);
> +	dev = class_find_device_by_of_node(fpga_bridge_class, np);
>  	if (!dev)
>  		return ERR_PTR(-ENODEV);
>  
> diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
> index c3866816456a..e05104f5e40c 100644
> --- a/drivers/fpga/fpga-mgr.c
> +++ b/drivers/fpga/fpga-mgr.c
> @@ -482,11 +482,6 @@ struct fpga_manager *fpga_mgr_get(struct device *dev)
>  }
>  EXPORT_SYMBOL_GPL(fpga_mgr_get);
>  
> -static int fpga_mgr_of_node_match(struct device *dev, const void *data)
> -{
> -	return dev->of_node == data;
> -}
> -
>  /**
>   * of_fpga_mgr_get - Given a device node, get a reference to a fpga mgr.
>   *
> @@ -498,8 +493,7 @@ struct fpga_manager *of_fpga_mgr_get(struct device_node *node)
>  {
>  	struct device *dev;
>  
> -	dev = class_find_device(fpga_mgr_class, NULL, node,
> -				fpga_mgr_of_node_match);
> +	dev = class_find_device_by_of_node(fpga_mgr_class, node);
>  	if (!dev)
>  		return ERR_PTR(-ENODEV);
>  
> diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
> index ad19df0686c9..bd2498bbd74a 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/i2c/i2c-core-of.c b/drivers/i2c/i2c-core-of.c
> index d1c48dec7118..6f632d543fcc 100644
> --- a/drivers/i2c/i2c-core-of.c
> +++ b/drivers/i2c/i2c-core-of.c
> @@ -113,11 +113,6 @@ 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)
> @@ -135,7 +130,7 @@ 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/mfd/altera-sysmgr.c b/drivers/mfd/altera-sysmgr.c
> index 2ee14d8a6d31..d2a13a547a3c 100644
> --- a/drivers/mfd/altera-sysmgr.c
> +++ b/drivers/mfd/altera-sysmgr.c
> @@ -87,16 +87,6 @@ static struct regmap_config altr_sysmgr_regmap_cfg = {
>  	.use_single_write = true,
>  };
>  
> -/**
> - * sysmgr_match_phandle
> - * Matching function used by driver_find_device().
> - * Return: True if match is found, otherwise false.
> - */
> -static int sysmgr_match_phandle(struct device *dev, const void *data)
> -{
> -	return dev->of_node == (const struct device_node *)data;
> -}
> -
>  /**
>   * altr_sysmgr_regmap_lookup_by_phandle
>   * Find the sysmgr previous configured in probe() and return regmap property.
> @@ -117,8 +107,8 @@ struct regmap *altr_sysmgr_regmap_lookup_by_phandle(struct device_node *np,
>  	if (!sysmgr_np)
>  		return ERR_PTR(-ENODEV);
>  
> -	dev = driver_find_device(&altr_sysmgr_driver.driver, NULL,
> -				 (void *)sysmgr_np, sysmgr_match_phandle);
> +	dev = driver_find_device_by_of_node(&altr_sysmgr_driver.driver,
> +					    (void *)sysmgr_np);
>  	of_node_put(sysmgr_np);
>  	if (!dev)
>  		return ERR_PTR(-EPROBE_DEFER);
> diff --git a/drivers/mux/core.c b/drivers/mux/core.c
> index d1271c1ee23c..1fb22388e7e0 100644
> --- a/drivers/mux/core.c
> +++ b/drivers/mux/core.c
> @@ -405,17 +405,12 @@ int mux_control_deselect(struct mux_control *mux)
>  }
>  EXPORT_SYMBOL_GPL(mux_control_deselect);
>  
> -static int of_dev_node_match(struct device *dev, const void *data)
> -{
> -	return dev->of_node == data;
> -}
> -
>  /* Note this function returns a reference to the mux_chip dev. */
>  static struct mux_chip *of_find_mux_chip_by_node(struct device_node *np)
>  {
>  	struct device *dev;
>  
> -	dev = class_find_device(&mux_class, NULL, np, of_dev_node_match);
> +	dev = class_find_device_by_of_node(&mux_class, np);
>  
>  	return dev ? to_mux_chip(dev) : NULL;
>  }
> diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
> index bd04fe762056..ce940871331e 100644
> --- a/drivers/net/phy/mdio_bus.c
> +++ b/drivers/net/phy/mdio_bus.c
> @@ -262,11 +262,6 @@ static struct class mdio_bus_class = {
>  };
>  
>  #if IS_ENABLED(CONFIG_OF_MDIO)
> -/* Helper function for of_mdio_find_bus */
> -static int of_mdio_bus_match(struct device *dev, const void *mdio_bus_np)
> -{
> -	return dev->of_node == mdio_bus_np;
> -}
>  /**
>   * of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
>   * @mdio_bus_np: Pointer to the mii_bus.
> @@ -287,9 +282,7 @@ struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
>  	if (!mdio_bus_np)
>  		return NULL;
>  
> -	d = class_find_device(&mdio_bus_class, NULL,  mdio_bus_np,
> -			      of_mdio_bus_match);
> -
> +	d = class_find_device_by_of_node(&mdio_bus_class, mdio_bus_np);
>  	return d ? to_mii_bus(d) : NULL;
>  }
>  EXPORT_SYMBOL(of_mdio_find_bus);
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index ac5d945be88a..057d1ff87d5d 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 44f53496cab1..000b95787df1 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 7801e25e6895..b47a2292fe8e 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/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
> index 397918ebba55..20dcc9c03adc 100644
> --- a/drivers/regulator/of_regulator.c
> +++ b/drivers/regulator/of_regulator.c
> @@ -460,16 +460,11 @@ struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
>  	return NULL;
>  }
>  
> -static int of_node_match(struct device *dev, const void *data)
> -{
> -	return dev->of_node == data;
> -}
> -
>  struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
>  {
>  	struct device *dev;
>  
> -	dev = class_find_device(&regulator_class, NULL, np, of_node_match);
> +	dev = class_find_device_by_of_node(&regulator_class, np);
>  
>  	return dev ? dev_to_rdev(dev) : NULL;
>  }
> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
> index 75ac046cae52..a591da87981a 100644
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -3652,37 +3652,25 @@ 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);
>  #endif /* IS_ENABLED(CONFIG_OF) */
>  
>  #if IS_ENABLED(CONFIG_OF_DYNAMIC)
> -static int __spi_of_controller_match(struct device *dev, const void *data)
> -{
> -	return dev->of_node == data;
> -}
> -
>  /* the spi controllers are not using spi_bus, so we find it with another way */
>  static struct spi_controller *of_find_spi_controller_by_node(struct device_node *node)
>  {
>  	struct device *dev;
>  
> -	dev = class_find_device(&spi_master_class, NULL, node,
> -				__spi_of_controller_match);
> +	dev = class_find_device_by_of_node(&spi_master_class, node);
>  	if (!dev && IS_ENABLED(CONFIG_SPI_SLAVE))
> -		dev = class_find_device(&spi_slave_class, NULL, node,
> -					__spi_of_controller_match);
> +		dev = class_find_device_by_of_node(&spi_slave_class, node);
>  	if (!dev)
>  		return NULL;
>  
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 3ba376b8b456..29d8d7ad41e6 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -186,6 +186,18 @@ 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,
> @@ -366,6 +378,19 @@ static inline struct device *driver_find_device_by_name(struct device_driver *dr
>  	return driver_find_device(drv, NULL, name, device_match_name);
>  }
>  
> +/**
> + * driver_find_device_by_of_node- device iterator for locating a particular device
> + * by of_node pointer.
> + * @driver: the driver we're iterating
> + * @np: of_node pointer to match.
> + */
> +static inline struct device *
> +driver_find_device_by_of_node(struct device_driver *drv,
> +			      const struct device_node *np)
> +{
> +	return driver_find_device(drv, NULL, np, device_match_of_node);
> +}
> +
>  void driver_deferred_probe_add(struct device *dev);
>  int driver_deferred_probe_check_state(struct device *dev);
>  int driver_deferred_probe_check_state_continue(struct device *dev);
> @@ -507,6 +532,18 @@ static inline struct device *class_find_device_by_name(struct class *class,
>  	return class_find_device(class, NULL, name, device_match_name);
>  }
>  
> +/**
> + * class_find_device_by_of_node : device iterator for locating a particular device
> + * matching the of_node.
> + * @class: class type
> + * @np: of_node of the device to match.
> + */
> +static inline struct device *
> +class_find_device_by_of_node(struct class *class, const struct device_node *np)
> +{
> +	return class_find_device(class, NULL, np, device_match_of_node);
> +}
> +
>  struct class_attribute {
>  	struct attribute attr;
>  	ssize_t (*show)(struct class *class, struct class_attribute *attr,
> diff --git a/sound/soc/rockchip/rk3399_gru_sound.c b/sound/soc/rockchip/rk3399_gru_sound.c
> index c16b0ffe8cfc..d951100bf770 100644
> --- a/sound/soc/rockchip/rk3399_gru_sound.c
> +++ b/sound/soc/rockchip/rk3399_gru_sound.c
> @@ -422,11 +422,6 @@ 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;
> @@ -438,8 +433,8 @@ 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);
> -- 
> 2.21.0
> 

Thanks,
Moritz

Re: [PATCH v3 2/7] drivers: Introduce device lookup variants by of_node

[Mark Brown]

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On Tue, Jul 23, 2019 at 11:18:33PM +0100, Suzuki K Poulose wrote:
> Introduce wrappers for {bus/driver/class}_find_device() to
> locate devices by its of_node.

Acked-by: Mark Brown <broonie@kernel.org>

[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

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

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Re: [PATCH v3 2/7] drivers: Introduce device lookup variants by of_node

[Greg KH]

On Thu, Jul 25, 2019 at 02:54:02PM +0100, Lee Jones wrote:
> On Tue, 23 Jul 2019, Suzuki K Poulose wrote:
> 
> > Introduce wrappers for {bus/driver/class}_find_device() to
> > locate devices by its of_node.
> > 
> > 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: Alan Tull <atull@kernel.org>
> > Cc: Moritz Fischer <mdf@kernel.org>
> > Cc: linux-fpga@vger.kernel.org
> > Cc: Peter Rosin <peda@axentia.se>
> > Cc: Mark Brown <broonie@kernel.org>
> > Cc: Florian Fainelli <f.fainelli@gmail.com>
> > Cc: Heiner Kallweit <hkallweit1@gmail.com>
> > Cc: "David S. Miller" <davem@davemloft.net>
> > Cc: Andrew Lunn <andrew@lunn.ch>
> > Cc: Liam Girdwood <lgirdwood@gmail.com>
> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> > Cc: Lee Jones <lee.jones@linaro.org>
> > Cc: Thor Thayer <thor.thayer@linux.intel.com>
> > Cc: Jiri Slaby <jslaby@suse.com>
> > Cc: Mark Brown <broonie@kernel.org>
> > Cc: Andrew Lunn <andrew@lunn.ch>
> > Cc: Peter Rosin <peda@axentia.se>
> > Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> > ---
> >  - Dropped the reviewed-by tags from Thor, Mark, Andrew and Peter as the
> >    patches are mereged, though there are no functional changes.
> > ---
> >  drivers/amba/tegra-ahb.c              | 11 +-------
> >  drivers/fpga/fpga-bridge.c            |  8 +-----
> >  drivers/fpga/fpga-mgr.c               |  8 +-----
> >  drivers/gpu/drm/drm_mipi_dsi.c        |  7 +----
> >  drivers/i2c/i2c-core-of.c             |  7 +----
> >  drivers/mfd/altera-sysmgr.c           | 14 ++--------
> 
> For my own reference:
>   Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>
> 
> What's the merge plan for this patch?
> 
> Is anyone prepared to create an immutable branch for us to pull from?
> I'm happy to do it if no one else steps up.

I'll take it, and create a branch for everyone to pull from.

thanks,

greg k-h
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Re: [PATCH v3 0/7] drivers: Add generic device lookup helpers

[Greg KH]

On Tue, Jul 23, 2019 at 11:18:31PM +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.
> 
> This series adds device match helpers by generic device properties of a device.
> Using these generic match functions, introduce wrappers to the existing
>  *_find_device() helpers and converts the existing users to use the new wrappers.
>  i.e,
> 	{bus/class/driver}_find_device_by_name()
> 	{bus/class/driver}_find_device_by_fwnode()
> 	{bus/class/driver}_find_device_by_devt()
> 	{bus/class/driver}_find_device_by_acpi_dev()
> 
> Also adds a wrapper for finding a platform device by driver, to avoid
> spilling the platform_bus internals in the individual drivers. Applies
> on 5.3-rc1.
> 
>    [0] git://linux-arm.org/linux-skp.git driver-cleanup/v3
> 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
> V2 [3] https://marc.info/?i=1560534863-15115-1-git-send-email-suzuki.poulose@arm.com

There is now a persistent tag/branch in my driver-core tree for any
subsystem that wants to pull this tree in to make it easier for merges:


The following changes since commit 5f9e832c137075045d15cd6899ab0505cfb2ca4b:

  Linus 5.3-rc1 (2019-07-21 14:05:38 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git tags/generic_lookup_helpers

for you to fetch changes up to 36f3313d6bff91ab2a9e47698c27d15363640a4e:

  platform: Add platform_find_device_by_driver() helper (2019-07-30 13:07:42 +0200)

----------------------------------------------------------------
Generic Device Lookup Helpers

Persistent tag for others to pull this branch from

Based on patch series from Suzuki K Poulose <suzuki.poulose@arm.com>
with Subject: [PATCH v3 0/7] drivers: Add generic device lookup helpers

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

----------------------------------------------------------------
Suzuki K Poulose (7):
      drivers: Introduce device lookup variants by name
      drivers: Introduce device lookup variants by of_node
      drivers: Introduce device lookup variants by fwnode
      drivers: Introduce device lookup variants by device type
      drivers: Introduce device lookup variants by ACPI_COMPANION device
      drivers: Add generic helper to match any device
      platform: Add platform_find_device_by_driver() helper

 drivers/amba/tegra-ahb.c                           |  11 +-
 drivers/base/bus.c                                 |  24 ---
 drivers/base/core.c                                |  39 +++-
 drivers/base/devcon.c                              |   8 +-
 drivers/base/platform.c                            |  14 ++
 drivers/fpga/fpga-bridge.c                         |   8 +-
 drivers/fpga/fpga-mgr.c                            |   8 +-
 drivers/gpu/drm/drm_mipi_dsi.c                     |   7 +-
 drivers/gpu/drm/exynos/exynos_drm_drv.c            |   9 +-
 drivers/gpu/drm/mcde/mcde_drv.c                    |   3 +-
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c        |   3 +-
 drivers/gpu/drm/vc4/vc4_drv.c                      |   3 +-
 drivers/hwtracing/coresight/coresight-platform.c   |  11 +-
 drivers/hwtracing/coresight/coresight-priv.h       |   2 -
 drivers/hwtracing/coresight/coresight.c            |   4 +-
 drivers/hwtracing/intel_th/core.c                  |  10 +-
 drivers/hwtracing/stm/core.c                       |   9 +-
 drivers/i2c/busses/i2c-amd-mp2-pci.c               |   8 +-
 drivers/i2c/i2c-core-acpi.c                        |  11 +-
 drivers/i2c/i2c-core-of.c                          |   7 +-
 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/misc/mei/main.c                            |   9 +-
 drivers/mux/core.c                                 |   7 +-
 drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c |   8 +-
 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/regulator/of_regulator.c                   |   7 +-
 drivers/rtc/interface.c                            |  11 +-
 drivers/s390/cio/ccwgroup.c                        |  18 +-
 drivers/s390/cio/device.c                          |  15 +-
 drivers/s390/crypto/zcrypt_api.c                   |  22 +-
 drivers/scsi/scsi_proc.c                           |   9 +-
 drivers/spi/spi.c                                  |  28 +--
 drivers/tty/tty_io.c                               |   8 +-
 drivers/usb/core/devio.c                           |   8 +-
 drivers/usb/roles/class.c                          |  16 +-
 drivers/usb/typec/class.c                          |  16 +-
 include/linux/device.h                             | 237 ++++++++++++++++++++-
 include/linux/platform_device.h                    |   3 +
 net/ieee802154/core.c                              |   7 +-
 sound/soc/rockchip/rk3399_gru_sound.c              |   9 +-
 48 files changed, 341 insertions(+), 383 deletions(-)
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