[PATCH v3 1/7] drivers: Introduce device lookup variants by name

[PATCH v3 1/7] drivers: Introduce device lookup variants by name

[Suzuki K Poulose]

Add a helper to match the device name for device lookup. Also
reuse this generic exported helper for the existing bus_find_device_by_name().
and add similar variants for driver/class.

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: Arnd Bergmann <arnd@arndb.de>
Cc: Dan Murphy <dmurphy@ti.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Harald Freudenberger <freude@linux.ibm.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: linux-leds@vger.kernel.org
Cc: linux-rtc@vger.kernel.org
Cc: linux-usb@vger.kernel.org
Cc: linux-wpan@vger.kernel.org
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Peter Oberparleiter <oberpar@linux.ibm.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Stefan Schmidt <stefan@datenfreihafen.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/base/bus.c               | 24 ------------------
 drivers/base/core.c              |  6 +++++
 drivers/hwtracing/stm/core.c     |  9 +------
 drivers/leds/led-class.c         |  9 +------
 drivers/rtc/interface.c          | 11 +--------
 drivers/s390/cio/ccwgroup.c      | 10 +-------
 drivers/s390/cio/device.c        | 15 +-----------
 drivers/s390/crypto/zcrypt_api.c | 11 +--------
 drivers/usb/roles/class.c        |  8 +-----
 drivers/usb/typec/class.c        |  8 +-----
 include/linux/device.h           | 42 +++++++++++++++++++++++++++++---
 net/ieee802154/core.c            |  7 +-----
 12 files changed, 54 insertions(+), 106 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index df3cac739813..a1d1e8256324 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -342,30 +342,6 @@ struct device *bus_find_device(struct bus_type *bus,
 }
 EXPORT_SYMBOL_GPL(bus_find_device);
 
-static int match_name(struct device *dev, const void *data)
-{
-	const char *name = data;
-
-	return sysfs_streq(name, dev_name(dev));
-}
-
-/**
- * bus_find_device_by_name - device iterator for locating a particular device of a specific name
- * @bus: bus type
- * @start: Device to begin with
- * @name: name of the device to match
- *
- * This is similar to the bus_find_device() function above, but it handles
- * searching by a name automatically, no need to write another strcmp matching
- * function.
- */
-struct device *bus_find_device_by_name(struct bus_type *bus,
-				       struct device *start, const char *name)
-{
-	return bus_find_device(bus, start, (void *)name, match_name);
-}
-EXPORT_SYMBOL_GPL(bus_find_device_by_name);
-
 /**
  * subsys_find_device_by_id - find a device with a specific enumeration number
  * @subsys: subsystem
diff --git a/drivers/base/core.c b/drivers/base/core.c
index da84a73f2ba6..fb83647d685a 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -3357,6 +3357,12 @@ void device_set_of_node_from_dev(struct device *dev, const struct device *dev2)
 }
 EXPORT_SYMBOL_GPL(device_set_of_node_from_dev);
 
+int device_match_name(struct device *dev, const void *name)
+{
+	return sysfs_streq(dev_name(dev), name);
+}
+EXPORT_SYMBOL_GPL(device_match_name);
+
 int device_match_of_node(struct device *dev, const void *np)
 {
 	return dev->of_node == np;
diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index e55b902560de..2b6bd42632e8 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -89,13 +89,6 @@ static struct class stm_class = {
 	.dev_groups	= stm_groups,
 };
 
-static int stm_dev_match(struct device *dev, const void *data)
-{
-	const char *name = data;
-
-	return sysfs_streq(name, dev_name(dev));
-}
-
 /**
  * stm_find_device() - find stm device by name
  * @buf:	character buffer containing the name
@@ -116,7 +109,7 @@ struct stm_device *stm_find_device(const char *buf)
 	if (!stm_core_up)
 		return NULL;
 
-	dev = class_find_device(&stm_class, NULL, buf, stm_dev_match);
+	dev = class_find_device_by_name(&stm_class, buf);
 	if (!dev)
 		return NULL;
 
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 4793e77808e2..d54c8e4d8954 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -213,13 +213,6 @@ static int led_resume(struct device *dev)
 
 static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume);
 
-static int match_name(struct device *dev, const void *data)
-{
-	if (!dev_name(dev))
-		return 0;
-	return !strcmp(dev_name(dev), (char *)data);
-}
-
 static int led_classdev_next_name(const char *init_name, char *name,
 				  size_t len)
 {
@@ -230,7 +223,7 @@ static int led_classdev_next_name(const char *init_name, char *name,
 	strlcpy(name, init_name, len);
 
 	while ((ret < len) &&
-	       (dev = class_find_device(leds_class, NULL, name, match_name))) {
+	       (dev = class_find_device_by_name(leds_class, name))) {
 		put_device(dev);
 		ret = snprintf(name, len, "%s_%u", init_name, ++i);
 	}
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 72b7ddc43116..c93ef33b01d3 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -663,21 +663,12 @@ void rtc_update_irq(struct rtc_device *rtc,
 }
 EXPORT_SYMBOL_GPL(rtc_update_irq);
 
-static int __rtc_match(struct device *dev, const void *data)
-{
-	const char *name = data;
-
-	if (strcmp(dev_name(dev), name) == 0)
-		return 1;
-	return 0;
-}
-
 struct rtc_device *rtc_class_open(const char *name)
 {
 	struct device *dev;
 	struct rtc_device *rtc = NULL;
 
-	dev = class_find_device(rtc_class, NULL, name, __rtc_match);
+	dev = class_find_device_by_name(rtc_class, name);
 	if (dev)
 		rtc = to_rtc_device(dev);
 
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index c522e9313c50..d843e362c167 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -608,13 +608,6 @@ void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver)
 }
 EXPORT_SYMBOL(ccwgroup_driver_unregister);
 
-static int __ccwgroupdev_check_busid(struct device *dev, const void *id)
-{
-	const char *bus_id = id;
-
-	return (strcmp(bus_id, dev_name(dev)) == 0);
-}
-
 /**
  * get_ccwgroupdev_by_busid() - obtain device from a bus id
  * @gdrv: driver the device is owned by
@@ -631,8 +624,7 @@ struct ccwgroup_device *get_ccwgroupdev_by_busid(struct ccwgroup_driver *gdrv,
 {
 	struct device *dev;
 
-	dev = driver_find_device(&gdrv->driver, NULL, bus_id,
-				 __ccwgroupdev_check_busid);
+	dev = driver_find_device_by_name(&gdrv->driver, bus_id);
 
 	return dev ? to_ccwgroupdev(dev) : NULL;
 }
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index c421899be20f..131430bd48d9 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1695,18 +1695,6 @@ int ccw_device_force_console(struct ccw_device *cdev)
 EXPORT_SYMBOL_GPL(ccw_device_force_console);
 #endif
 
-/*
- * get ccw_device matching the busid, but only if owned by cdrv
- */
-static int
-__ccwdev_check_busid(struct device *dev, const void *id)
-{
-	const char *bus_id = id;
-
-	return (strcmp(bus_id, dev_name(dev)) == 0);
-}
-
-
 /**
  * get_ccwdev_by_busid() - obtain device from a bus id
  * @cdrv: driver the device is owned by
@@ -1723,8 +1711,7 @@ struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
 {
 	struct device *dev;
 
-	dev = driver_find_device(&cdrv->driver, NULL, (void *)bus_id,
-				 __ccwdev_check_busid);
+	dev = driver_find_device_by_name(&cdrv->driver, bus_id);
 
 	return dev ? to_ccwdev(dev) : NULL;
 }
diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
index 1058b4b5cc1e..38a5a47b8c9c 100644
--- a/drivers/s390/crypto/zcrypt_api.c
+++ b/drivers/s390/crypto/zcrypt_api.c
@@ -133,12 +133,6 @@ struct zcdn_device {
 static int zcdn_create(const char *name);
 static int zcdn_destroy(const char *name);
 
-/* helper function, matches the name for find_zcdndev_by_name() */
-static int __match_zcdn_name(struct device *dev, const void *data)
-{
-	return strcmp(dev_name(dev), (const char *)data) == 0;
-}
-
 /* helper function, matches the devt value for find_zcdndev_by_devt() */
 static int __match_zcdn_devt(struct device *dev, const void *data)
 {
@@ -152,10 +146,7 @@ static int __match_zcdn_devt(struct device *dev, const void *data)
  */
 static inline struct zcdn_device *find_zcdndev_by_name(const char *name)
 {
-	struct device *dev =
-		class_find_device(zcrypt_class, NULL,
-				  (void *) name,
-				  __match_zcdn_name);
+	struct device *dev = class_find_device_by_name(zcrypt_class, name);
 
 	return dev ? to_zcdn_dev(dev) : NULL;
 }
diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index 86defca6623e..c8efe60e2465 100644
--- a/drivers/usb/roles/class.c
+++ b/drivers/usb/roles/class.c
@@ -90,11 +90,6 @@ static int switch_fwnode_match(struct device *dev, const void *fwnode)
 	return dev_fwnode(dev) == fwnode;
 }
 
-static int switch_name_match(struct device *dev, const void *name)
-{
-	return !strcmp((const char *)name, dev_name(dev));
-}
-
 static void *usb_role_switch_match(struct device_connection *con, int ep,
 				   void *data)
 {
@@ -107,8 +102,7 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
 		dev = class_find_device(role_class, NULL, con->fwnode,
 					switch_fwnode_match);
 	} else {
-		dev = class_find_device(role_class, NULL, con->endpoint[ep],
-					switch_name_match);
+		dev = class_find_device_by_name(role_class, con->endpoint[ep]);
 	}
 
 	return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index a18285a990a8..9b0d15b487e5 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -210,11 +210,6 @@ static int typec_port_fwnode_match(struct device *dev, const void *fwnode)
 	return dev_fwnode(dev) == fwnode;
 }
 
-static int typec_port_name_match(struct device *dev, const void *name)
-{
-	return !strcmp((const char *)name, dev_name(dev));
-}
-
 static void *typec_port_match(struct device_connection *con, int ep, void *data)
 {
 	struct device *dev;
@@ -227,8 +222,7 @@ static void *typec_port_match(struct device_connection *con, int ep, void *data)
 		return class_find_device(typec_class, NULL, con->fwnode,
 					 typec_port_fwnode_match);
 
-	dev = class_find_device(typec_class, NULL, con->endpoint[ep],
-				typec_port_name_match);
+	dev = class_find_device_by_name(typec_class, con->endpoint[ep]);
 
 	return dev ? dev : ERR_PTR(-EPROBE_DEFER);
 }
diff --git a/include/linux/device.h b/include/linux/device.h
index c330b75c6c57..3ba376b8b456 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -164,6 +164,7 @@ void subsys_dev_iter_init(struct subsys_dev_iter *iter,
 struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
 void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
 
+int device_match_name(struct device *dev, const void *name);
 int device_match_of_node(struct device *dev, const void *np);
 
 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
@@ -171,9 +172,20 @@ int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
 struct device *bus_find_device(struct bus_type *bus, struct device *start,
 			       const void *data,
 			       int (*match)(struct device *dev, const void *data));
-struct device *bus_find_device_by_name(struct bus_type *bus,
-				       struct device *start,
-				       const char *name);
+/**
+ * bus_find_device_by_name - device iterator for locating a particular device
+ * of a specific name.
+ * @bus: bus type
+ * @start: Device to begin with
+ * @name: name of the device to match
+ */
+static inline struct device *bus_find_device_by_name(struct bus_type *bus,
+						     struct device *start,
+						     const char *name)
+{
+	return bus_find_device(bus, start, name, device_match_name);
+}
+
 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,
@@ -342,6 +354,18 @@ struct device *driver_find_device(struct device_driver *drv,
 				  struct device *start, const void *data,
 				  int (*match)(struct device *dev, const void *data));
 
+/**
+ * driver_find_device_by_name - device iterator for locating a particular device
+ * of a specific name.
+ * @driver: the driver we're iterating
+ * @name: name of the device to match
+ */
+static inline struct device *driver_find_device_by_name(struct device_driver *drv,
+							const char *name)
+{
+	return driver_find_device(drv, NULL, name, device_match_name);
+}
+
 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);
@@ -471,6 +495,18 @@ extern struct device *class_find_device(struct class *class,
 					struct device *start, const void *data,
 					int (*match)(struct device *, const void *));
 
+/**
+ * class_find_device_by_name - device iterator for locating a particular device
+ * of a specific name.
+ * @class: class type
+ * @name: name of the device to match
+ */
+static inline struct device *class_find_device_by_name(struct class *class,
+						       const char *name)
+{
+	return class_find_device(class, NULL, name, device_match_name);
+}
+
 struct class_attribute {
 	struct attribute attr;
 	ssize_t (*show)(struct class *class, struct class_attribute *attr,
diff --git a/net/ieee802154/core.c b/net/ieee802154/core.c
index 60b7ac56a1f5..de259b5170ab 100644
--- a/net/ieee802154/core.c
+++ b/net/ieee802154/core.c
@@ -23,11 +23,6 @@
 LIST_HEAD(cfg802154_rdev_list);
 int cfg802154_rdev_list_generation;
 
-static int wpan_phy_match(struct device *dev, const void *data)
-{
-	return !strcmp(dev_name(dev), (const char *)data);
-}
-
 struct wpan_phy *wpan_phy_find(const char *str)
 {
 	struct device *dev;
@@ -35,7 +30,7 @@ struct wpan_phy *wpan_phy_find(const char *str)
 	if (WARN_ON(!str))
 		return NULL;
 
-	dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match);
+	dev = class_find_device_by_name(&wpan_phy_class, str);
 	if (!dev)
 		return NULL;
 
-- 
2.21.0

[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

[PATCH v3 3/7] drivers: Introduce device lookup variants by fwnode

[Suzuki K Poulose]

Add a helper to match the firmware node handle of a device and provide
wrappers for {bus/class/driver}_find_device() APIs to avoid proliferation
of duplicate custom match functions.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-usb@vger.kernel.org
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Joe Perches <joe@perches.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/base/core.c                           |  6 +++
 drivers/base/devcon.c                         |  8 +---
 .../hwtracing/coresight/coresight-platform.c  | 11 +-----
 drivers/hwtracing/coresight/coresight-priv.h  |  2 -
 drivers/hwtracing/coresight/coresight.c       |  4 +-
 drivers/infiniband/hw/hns/hns_roce_hw_v1.c    |  8 +---
 drivers/iommu/arm-smmu-v3.c                   |  9 +----
 drivers/iommu/arm-smmu.c                      |  9 +----
 .../ethernet/hisilicon/hns/hns_dsaf_misc.c    |  8 +---
 drivers/usb/roles/class.c                     |  8 +---
 drivers/usb/typec/class.c                     |  8 +---
 include/linux/device.h                        | 39 +++++++++++++++++++
 12 files changed, 57 insertions(+), 63 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index fb83647d685a..e8f81a667545 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -3368,3 +3368,9 @@ int device_match_of_node(struct device *dev, const void *np)
 	return dev->of_node == np;
 }
 EXPORT_SYMBOL_GPL(device_match_of_node);
+
+int device_match_fwnode(struct device *dev, const void *fwnode)
+{
+	return dev_fwnode(dev) == fwnode;
+}
+EXPORT_SYMBOL_GPL(device_match_fwnode);
diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
index 09f28479b243..1d488dc5dd0c 100644
--- a/drivers/base/devcon.c
+++ b/drivers/base/devcon.c
@@ -133,19 +133,13 @@ static struct bus_type *generic_match_buses[] = {
 	NULL,
 };
 
-static int device_fwnode_match(struct device *dev, const void *fwnode)
-{
-	return dev_fwnode(dev) == fwnode;
-}
-
 static void *device_connection_fwnode_match(struct device_connection *con)
 {
 	struct bus_type *bus;
 	struct device *dev;
 
 	for (bus = generic_match_buses[0]; bus; bus++) {
-		dev = bus_find_device(bus, NULL, (void *)con->fwnode,
-				      device_fwnode_match);
+		dev = bus_find_device_by_fwnode(bus, con->fwnode);
 		if (dev && !strncmp(dev_name(dev), con->id, strlen(con->id)))
 			return dev;
 
diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index dad7d96c5943..3c5bee429105 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -37,11 +37,6 @@ static int coresight_alloc_conns(struct device *dev,
 	return 0;
 }
 
-int coresight_device_fwnode_match(struct device *dev, const void *fwnode)
-{
-	return dev_fwnode(dev) == fwnode;
-}
-
 static struct device *
 coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
 {
@@ -51,8 +46,7 @@ coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
 	 * If we have a non-configurable replicator, it will be found on the
 	 * platform bus.
 	 */
-	dev = bus_find_device(&platform_bus_type, NULL,
-			      fwnode, coresight_device_fwnode_match);
+	dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
 	if (dev)
 		return dev;
 
@@ -60,8 +54,7 @@ coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
 	 * 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,
-			       fwnode, coresight_device_fwnode_match);
+	return bus_find_device_by_fwnode(&amba_bustype, fwnode);
 }
 
 #ifdef CONFIG_OF
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index 7d401790dd7e..61d7f9ff054d 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -202,6 +202,4 @@ static inline void *coresight_get_uci_data(const struct amba_id *id)
 
 void coresight_release_platform_data(struct coresight_platform_data *pdata);
 
-int coresight_device_fwnode_match(struct device *dev, const void *fwnode);
-
 #endif
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 55db77f6410b..6453c67a4d01 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -1046,9 +1046,7 @@ static void coresight_fixup_device_conns(struct coresight_device *csdev)
 		struct coresight_connection *conn = &csdev->pdata->conns[i];
 		struct device *dev = NULL;
 
-		dev = bus_find_device(&coresight_bustype, NULL,
-				      (void *)conn->child_fwnode,
-				      coresight_device_fwnode_match);
+		dev = bus_find_device_by_fwnode(&coresight_bustype, conn->child_fwnode);
 		if (dev) {
 			conn->child_dev = to_coresight_device(dev);
 			/* and put reference from 'bus_find_device()' */
diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
index 81e6dedb1e02..fa05e943038a 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
@@ -4499,19 +4499,13 @@ static const struct acpi_device_id hns_roce_acpi_match[] = {
 };
 MODULE_DEVICE_TABLE(acpi, hns_roce_acpi_match);
 
-static int hns_roce_node_match(struct device *dev, const void *fwnode)
-{
-	return dev->fwnode == fwnode;
-}
-
 static struct
 platform_device *hns_roce_find_pdev(struct fwnode_handle *fwnode)
 {
 	struct device *dev;
 
 	/* get the 'device' corresponding to the matching 'fwnode' */
-	dev = bus_find_device(&platform_bus_type, NULL,
-			      fwnode, hns_roce_node_match);
+	dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
 	/* get the platform device */
 	return dev ? to_platform_device(dev) : NULL;
 }
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index a9a9fabd3968..6f0e13fa5e1a 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2034,16 +2034,11 @@ arm_smmu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
 
 static struct platform_driver arm_smmu_driver;
 
-static int arm_smmu_match_node(struct device *dev, const void *data)
-{
-	return dev->fwnode == data;
-}
-
 static
 struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
 {
-	struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
-						fwnode, arm_smmu_match_node);
+	struct device *dev = driver_find_device_by_fwnode(&arm_smmu_driver.driver,
+							  fwnode);
 	put_device(dev);
 	return dev ? dev_get_drvdata(dev) : NULL;
 }
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 64977c131ee6..aa06498f291d 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1426,16 +1426,11 @@ static bool arm_smmu_capable(enum iommu_cap cap)
 	}
 }
 
-static int arm_smmu_match_node(struct device *dev, const void *data)
-{
-	return dev->fwnode == data;
-}
-
 static
 struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
 {
-	struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
-						fwnode, arm_smmu_match_node);
+	struct device *dev = driver_find_device_by_fwnode(&arm_smmu_driver.driver,
+							  fwnode);
 	put_device(dev);
 	return dev ? dev_get_drvdata(dev) : NULL;
 }
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
index bb6586d0e5af..ed3829ae4ef1 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
@@ -754,17 +754,11 @@ struct dsaf_misc_op *hns_misc_op_get(struct dsaf_device *dsaf_dev)
 	return (void *)misc_op;
 }
 
-static int hns_dsaf_dev_match(struct device *dev, const void *fwnode)
-{
-	return dev->fwnode == fwnode;
-}
-
 struct
 platform_device *hns_dsaf_find_platform_device(struct fwnode_handle *fwnode)
 {
 	struct device *dev;
 
-	dev = bus_find_device(&platform_bus_type, NULL,
-			      fwnode, hns_dsaf_dev_match);
+	dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
 	return dev ? to_platform_device(dev) : NULL;
 }
diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index c8efe60e2465..0526efbc4922 100644
--- a/drivers/usb/roles/class.c
+++ b/drivers/usb/roles/class.c
@@ -85,11 +85,6 @@ enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
 }
 EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
 
-static int switch_fwnode_match(struct device *dev, const void *fwnode)
-{
-	return dev_fwnode(dev) == fwnode;
-}
-
 static void *usb_role_switch_match(struct device_connection *con, int ep,
 				   void *data)
 {
@@ -99,8 +94,7 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
 		if (con->id && !fwnode_property_present(con->fwnode, con->id))
 			return NULL;
 
-		dev = class_find_device(role_class, NULL, con->fwnode,
-					switch_fwnode_match);
+		dev = class_find_device_by_fwnode(role_class, con->fwnode);
 	} else {
 		dev = class_find_device_by_name(role_class, con->endpoint[ep]);
 	}
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 9b0d15b487e5..94a3eda62add 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -205,11 +205,6 @@ static void typec_altmode_put_partner(struct altmode *altmode)
 	put_device(&adev->dev);
 }
 
-static int typec_port_fwnode_match(struct device *dev, const void *fwnode)
-{
-	return dev_fwnode(dev) == fwnode;
-}
-
 static void *typec_port_match(struct device_connection *con, int ep, void *data)
 {
 	struct device *dev;
@@ -219,8 +214,7 @@ static void *typec_port_match(struct device_connection *con, int ep, void *data)
 	 * we need to return ERR_PTR(-PROBE_DEFER) when there is no device.
 	 */
 	if (con->fwnode)
-		return class_find_device(typec_class, NULL, con->fwnode,
-					 typec_port_fwnode_match);
+		return class_find_device_by_fwnode(typec_class, con->fwnode);
 
 	dev = class_find_device_by_name(typec_class, con->endpoint[ep]);
 
diff --git a/include/linux/device.h b/include/linux/device.h
index 29d8d7ad41e6..7133fc1c285d 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -166,6 +166,7 @@ void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
 
 int device_match_name(struct device *dev, const void *name);
 int device_match_of_node(struct device *dev, const void *np);
+int device_match_fwnode(struct device *dev, const void *fwnode);
 
 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
 		     int (*fn)(struct device *dev, void *data));
@@ -198,6 +199,18 @@ 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);
 }
 
+/**
+ * bus_find_device_by_fwnode : device iterator for locating a particular device
+ * matching the fwnode.
+ * @bus: bus type
+ * @fwnode: fwnode of the device to match.
+ */
+static inline struct device *
+bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwnode)
+{
+	return bus_find_device(bus, NULL, fwnode, device_match_fwnode);
+}
+
 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,
@@ -391,6 +404,19 @@ driver_find_device_by_of_node(struct device_driver *drv,
 	return driver_find_device(drv, NULL, np, device_match_of_node);
 }
 
+/**
+ * driver_find_device_by_fwnode- device iterator for locating a particular device
+ * by fwnode pointer.
+ * @driver: the driver we're iterating
+ * @fwnode: fwnode pointer to match.
+ */
+static inline struct device *
+driver_find_device_by_fwnode(struct device_driver *drv,
+			     const struct fwnode_handle *fwnode)
+{
+	return driver_find_device(drv, NULL, fwnode, device_match_fwnode);
+}
+
 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);
@@ -544,6 +570,19 @@ 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);
 }
 
+/**
+ * class_find_device_by_fwnode : device iterator for locating a particular device
+ * matching the fwnode.
+ * @class: class type
+ * @fwnode: fwnode of the device to match.
+ */
+static inline struct device *
+class_find_device_by_fwnode(struct class *class,
+			    const struct fwnode_handle *fwnode)
+{
+	return class_find_device(class, NULL, fwnode, device_match_fwnode);
+}
+
 struct class_attribute {
 	struct attribute attr;
 	ssize_t (*show)(struct class *class, struct class_attribute *attr,
-- 
2.21.0

[PATCH v3 4/7] drivers: Introduce device lookup variants by device type

[Suzuki K Poulose]

Add a helper to match a device by its type and provide wrappers
for {bus/class/driver}_find_device() APIs.

Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Harald Freudenberger <freude@linux.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux-usb@vger.kernel.org
Cc: Oliver Neukum <oneukum@suse.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Tomas Winkler <tomas.winkler@intel.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/base/core.c               | 15 ++++++-------
 drivers/hwtracing/intel_th/core.c | 10 +--------
 drivers/misc/mei/main.c           |  9 +-------
 drivers/s390/crypto/zcrypt_api.c  | 11 +--------
 drivers/tty/tty_io.c              |  8 +------
 drivers/usb/core/devio.c          |  8 +------
 include/linux/device.h            | 37 +++++++++++++++++++++++++++++++
 7 files changed, 49 insertions(+), 49 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index e8f81a667545..3abc32b60c0a 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2867,13 +2867,6 @@ struct device *device_create_with_groups(struct class *class,
 }
 EXPORT_SYMBOL_GPL(device_create_with_groups);
 
-static int __match_devt(struct device *dev, const void *data)
-{
-	const dev_t *devt = data;
-
-	return dev->devt == *devt;
-}
-
 /**
  * device_destroy - removes a device that was created with device_create()
  * @class: pointer to the struct class that this device was registered with
@@ -2886,7 +2879,7 @@ void device_destroy(struct class *class, dev_t devt)
 {
 	struct device *dev;
 
-	dev = class_find_device(class, NULL, &devt, __match_devt);
+	dev = class_find_device_by_devt(class, devt);
 	if (dev) {
 		put_device(dev);
 		device_unregister(dev);
@@ -3374,3 +3367,9 @@ int device_match_fwnode(struct device *dev, const void *fwnode)
 	return dev_fwnode(dev) == fwnode;
 }
 EXPORT_SYMBOL_GPL(device_match_fwnode);
+
+int device_match_devt(struct device *dev, const void *pdevt)
+{
+	return dev->devt == *(dev_t *)pdevt;
+}
+EXPORT_SYMBOL_GPL(device_match_devt);
diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c
index 55922896d862..d5c1821b31c6 100644
--- a/drivers/hwtracing/intel_th/core.c
+++ b/drivers/hwtracing/intel_th/core.c
@@ -789,12 +789,6 @@ static int intel_th_populate(struct intel_th *th)
 	return 0;
 }
 
-static int match_devt(struct device *dev, const void *data)
-{
-	dev_t devt = (dev_t)(unsigned long)(void *)data;
-	return dev->devt == devt;
-}
-
 static int intel_th_output_open(struct inode *inode, struct file *file)
 {
 	const struct file_operations *fops;
@@ -802,9 +796,7 @@ static int intel_th_output_open(struct inode *inode, struct file *file)
 	struct device *dev;
 	int err;
 
-	dev = bus_find_device(&intel_th_bus, NULL,
-			      (void *)(unsigned long)inode->i_rdev,
-			      match_devt);
+	dev = bus_find_device_by_devt(&intel_th_bus, inode->i_rdev);
 	if (!dev || !dev->driver)
 		return -ENODEV;
 
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index f894d1f8a53e..7310b476323c 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -858,13 +858,6 @@ static ssize_t dev_state_show(struct device *device,
 }
 static DEVICE_ATTR_RO(dev_state);
 
-static int match_devt(struct device *dev, const void *data)
-{
-	const dev_t *devt = data;
-
-	return dev->devt == *devt;
-}
-
 /**
  * dev_set_devstate: set to new device state and notify sysfs file.
  *
@@ -880,7 +873,7 @@ void mei_set_devstate(struct mei_device *dev, enum mei_dev_state state)
 
 	dev->dev_state = state;
 
-	clsdev = class_find_device(mei_class, NULL, &dev->cdev.dev, match_devt);
+	clsdev = class_find_device_by_devt(mei_class, dev->cdev.dev);
 	if (clsdev) {
 		sysfs_notify(&clsdev->kobj, NULL, "dev_state");
 		put_device(clsdev);
diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
index 38a5a47b8c9c..150f6236c9bb 100644
--- a/drivers/s390/crypto/zcrypt_api.c
+++ b/drivers/s390/crypto/zcrypt_api.c
@@ -133,12 +133,6 @@ struct zcdn_device {
 static int zcdn_create(const char *name);
 static int zcdn_destroy(const char *name);
 
-/* helper function, matches the devt value for find_zcdndev_by_devt() */
-static int __match_zcdn_devt(struct device *dev, const void *data)
-{
-	return dev->devt == *((dev_t *) data);
-}
-
 /*
  * Find zcdn device by name.
  * Returns reference to the zcdn device which needs to be released
@@ -158,10 +152,7 @@ static inline struct zcdn_device *find_zcdndev_by_name(const char *name)
  */
 static inline struct zcdn_device *find_zcdndev_by_devt(dev_t devt)
 {
-	struct device *dev =
-		class_find_device(zcrypt_class, NULL,
-				  (void *) &devt,
-				  __match_zcdn_devt);
+	struct device *dev = class_find_device_by_devt(zcrypt_class, devt);
 
 	return dev ? to_zcdn_dev(dev) : NULL;
 }
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 566728fbaf3c..802c1210558f 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2952,17 +2952,11 @@ void do_SAK(struct tty_struct *tty)
 
 EXPORT_SYMBOL(do_SAK);
 
-static int dev_match_devt(struct device *dev, const void *data)
-{
-	const dev_t *devt = data;
-	return dev->devt == *devt;
-}
-
 /* Must put_device() after it's unused! */
 static struct device *tty_get_device(struct tty_struct *tty)
 {
 	dev_t devt = tty_devnum(tty);
-	return class_find_device(tty_class, NULL, &devt, dev_match_devt);
+	return class_find_device_by_devt(tty_class, devt);
 }
 
 
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index b265ab5405f9..60268aee93a8 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -942,17 +942,11 @@ static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 	return ret;
 }
 
-static int match_devt(struct device *dev, const void *data)
-{
-	return dev->devt == (dev_t)(unsigned long)(void *)data;
-}
-
 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 {
 	struct device *dev;
 
-	dev = bus_find_device(&usb_bus_type, NULL,
-			      (void *) (unsigned long) devt, match_devt);
+	dev = bus_find_device_by_devt(&usb_bus_type, devt);
 	if (!dev)
 		return NULL;
 	return to_usb_device(dev);
diff --git a/include/linux/device.h b/include/linux/device.h
index 7133fc1c285d..93b2f55ef44e 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -167,6 +167,7 @@ void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
 int device_match_name(struct device *dev, const void *name);
 int device_match_of_node(struct device *dev, const void *np);
 int device_match_fwnode(struct device *dev, const void *fwnode);
+int device_match_devt(struct device *dev, const void *pdevt);
 
 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
 		     int (*fn)(struct device *dev, void *data));
@@ -211,6 +212,18 @@ bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwno
 	return bus_find_device(bus, NULL, fwnode, device_match_fwnode);
 }
 
+/**
+ * bus_find_device_by_devt : device iterator for locating a particular device
+ * matching the device type.
+ * @bus: bus type
+ * @devt: device type of the device to match.
+ */
+static inline struct device *bus_find_device_by_devt(struct bus_type *bus,
+						     dev_t devt)
+{
+	return bus_find_device(bus, NULL, &devt, device_match_devt);
+}
+
 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,
@@ -417,6 +430,18 @@ driver_find_device_by_fwnode(struct device_driver *drv,
 	return driver_find_device(drv, NULL, fwnode, device_match_fwnode);
 }
 
+/**
+ * driver_find_device_by_devt- device iterator for locating a particular device
+ * by devt.
+ * @driver: the driver we're iterating
+ * @devt: devt pointer to match.
+ */
+static inline struct device *driver_find_device_by_devt(struct device_driver *drv,
+							dev_t devt)
+{
+	return driver_find_device(drv, NULL, &devt, device_match_devt);
+}
+
 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);
@@ -583,6 +608,18 @@ class_find_device_by_fwnode(struct class *class,
 	return class_find_device(class, NULL, fwnode, device_match_fwnode);
 }
 
+/**
+ * class_find_device_by_devt : device iterator for locating a particular device
+ * matching the device type.
+ * @class: class type
+ * @devt: device type of the device to match.
+ */
+static inline struct device *class_find_device_by_devt(struct class *class,
+						       dev_t devt)
+{
+	return class_find_device(class, NULL, &devt, device_match_devt);
+}
+
 struct class_attribute {
 	struct attribute attr;
 	ssize_t (*show)(struct class *class, struct class_attribute *attr,
-- 
2.21.0

[PATCH v3 5/7] drivers: Introduce device lookup variants by ACPI_COMPANION device

[Suzuki K Poulose]

Add a generic helper to match a device by the ACPI_COMPANION device
and provide wrappers for the device lookup APIs.

Cc: Len Brown <lenb@kernel.org>
Cc: linux-acpi@vger.kernel.org
Cc: linux-spi@vger.kernel.org
Cc: Mark Brown <broonie@kernel.org>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: linux-i2c@vger.kernel.org
Cc: Mark Brown <broonie@kernel.org>
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/base/core.c         |  6 ++++
 drivers/i2c/i2c-core-acpi.c | 11 ++-----
 drivers/spi/spi.c           |  8 +----
 include/linux/device.h      | 65 +++++++++++++++++++++++++++++++++++++
 4 files changed, 74 insertions(+), 16 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 3abc32b60c0a..57d71bc2c559 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -3373,3 +3373,9 @@ int device_match_devt(struct device *dev, const void *pdevt)
 	return dev->devt == *(dev_t *)pdevt;
 }
 EXPORT_SYMBOL_GPL(device_match_devt);
+
+int device_match_acpi_dev(struct device *dev, const void *adev)
+{
+	return ACPI_COMPANION(dev) == adev;
+}
+EXPORT_SYMBOL(device_match_acpi_dev);
diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index 4dbbc9a35f65..bc80aafb521f 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -354,17 +354,11 @@ static int i2c_acpi_find_match_adapter(struct device *dev, const void *data)
 	return ACPI_HANDLE(dev) == (acpi_handle)data;
 }
 
-static int i2c_acpi_find_match_device(struct device *dev, const void *data)
-{
-	return ACPI_COMPANION(dev) == data;
-}
 
 struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
 {
-	struct device *dev;
+	struct device *dev = bus_find_device_by_acpi_dev(&i2c_bus_type, handle);
 
-	dev = bus_find_device(&i2c_bus_type, NULL, handle,
-			      i2c_acpi_find_match_adapter);
 	return dev ? i2c_verify_adapter(dev) : NULL;
 }
 EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle);
@@ -373,8 +367,7 @@ static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev)
 {
 	struct device *dev;
 
-	dev = bus_find_device(&i2c_bus_type, NULL, adev,
-			      i2c_acpi_find_match_device);
+	dev = bus_find_device_by_acpi_dev(&i2c_bus_type, adev);
 	return dev ? i2c_verify_client(dev) : NULL;
 }
 
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index a591da87981a..c486a6f84c2c 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -3741,11 +3741,6 @@ static int spi_acpi_controller_match(struct device *dev, const void *data)
 	return ACPI_COMPANION(dev->parent) == data;
 }
 
-static int spi_acpi_device_match(struct device *dev, const void *data)
-{
-	return ACPI_COMPANION(dev) == data;
-}
-
 static struct spi_controller *acpi_spi_find_controller_by_adev(struct acpi_device *adev)
 {
 	struct device *dev;
@@ -3765,8 +3760,7 @@ static struct spi_device *acpi_spi_find_device_by_adev(struct acpi_device *adev)
 {
 	struct device *dev;
 
-	dev = bus_find_device(&spi_bus_type, NULL, adev, spi_acpi_device_match);
-
+	dev = bus_find_device_by_acpi_dev(&spi_bus_type, adev);
 	return dev ? to_spi_device(dev) : NULL;
 }
 
diff --git a/include/linux/device.h b/include/linux/device.h
index 93b2f55ef44e..7514ef3d3f1a 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -168,6 +168,7 @@ int device_match_name(struct device *dev, const void *name);
 int device_match_of_node(struct device *dev, const void *np);
 int device_match_fwnode(struct device *dev, const void *fwnode);
 int device_match_devt(struct device *dev, const void *pdevt);
+int device_match_acpi_dev(struct device *dev, const void *adev);
 
 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
 		     int (*fn)(struct device *dev, void *data));
@@ -224,6 +225,28 @@ static inline struct device *bus_find_device_by_devt(struct bus_type *bus,
 	return bus_find_device(bus, NULL, &devt, device_match_devt);
 }
 
+#ifdef CONFIG_ACPI
+struct acpi_device;
+
+/**
+ * bus_find_device_by_acpi_dev : device iterator for locating a particular device
+ * matching the ACPI COMPANION device.
+ * @bus: bus type
+ * @adev: ACPI COMPANION device to match.
+ */
+static inline struct device *
+bus_find_device_by_acpi_dev(struct bus_type *bus, const struct acpi_device *adev)
+{
+	return bus_find_device(bus, NULL, adev, device_match_acpi_dev);
+}
+#else
+static inline struct device *
+bus_find_device_by_acpi_dev(struct bus_type *bus, const void *adev)
+{
+	return NULL;
+}
+#endif
+
 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,
@@ -442,6 +465,27 @@ static inline struct device *driver_find_device_by_devt(struct device_driver *dr
 	return driver_find_device(drv, NULL, &devt, device_match_devt);
 }
 
+#ifdef CONFIG_ACPI
+/**
+ * driver_find_device_by_acpi_dev : device iterator for locating a particular
+ * device matching the ACPI_COMPANION device.
+ * @driver: the driver we're iterating
+ * @adev: ACPI_COMPANION device to match.
+ */
+static inline struct device *
+driver_find_device_by_acpi_dev(struct device_driver *drv,
+			       const struct acpi_device *adev)
+{
+	return driver_find_device(drv, NULL, adev, device_match_acpi_dev);
+}
+#else
+static inline struct device *
+driver_find_device_by_acpi_dev(struct device_driver *drv, const void *adev)
+{
+	return NULL;
+}
+#endif
+
 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);
@@ -620,6 +664,27 @@ static inline struct device *class_find_device_by_devt(struct class *class,
 	return class_find_device(class, NULL, &devt, device_match_devt);
 }
 
+#ifdef CONFIG_ACPI
+struct acpi_device;
+/**
+ * class_find_device_by_acpi_dev : device iterator for locating a particular
+ * device matching the ACPI_COMPANION device.
+ * @class: class type
+ * @adev: ACPI_COMPANION device to match.
+ */
+static inline struct device *
+class_find_device_by_acpi_dev(struct class *class, const struct acpi_device *adev)
+{
+	return class_find_device(class, NULL, adev, device_match_acpi_dev);
+}
+#else
+static inline struct device *
+class_find_device_by_acpi_dev(struct class *class, const void *adev)
+{
+	return NULL;
+}
+#endif
+
 struct class_attribute {
 	struct attribute attr;
 	ssize_t (*show)(struct class *class, struct class_attribute *attr,
-- 
2.21.0

[PATCH v3 6/7] drivers: Add generic helper to match any device

[Suzuki K Poulose]

Add a generic helper to match any/all devices. Using this
introduce new wrappers {bus/driver/class}_find_next_device().

Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Elie Morisse <syniurge@gmail.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Nehal Shah <nehal-bakulchandra.shah@amd.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Shyam Sundar S K <shyam-sundar.s-k@amd.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/base/core.c                  |  6 ++++++
 drivers/i2c/busses/i2c-amd-mp2-pci.c |  8 +-------
 drivers/pci/probe.c                  |  7 +------
 drivers/s390/cio/ccwgroup.c          |  8 +-------
 drivers/scsi/scsi_proc.c             |  9 ++-------
 include/linux/device.h               | 17 +++++++++++++++++
 6 files changed, 28 insertions(+), 27 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 57d71bc2c559..e22e29b3dc97 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -3379,3 +3379,9 @@ int device_match_acpi_dev(struct device *dev, const void *adev)
 	return ACPI_COMPANION(dev) == adev;
 }
 EXPORT_SYMBOL(device_match_acpi_dev);
+
+int device_match_any(struct device *dev, const void *unused)
+{
+	return 1;
+}
+EXPORT_SYMBOL_GPL(device_match_any);
diff --git a/drivers/i2c/busses/i2c-amd-mp2-pci.c b/drivers/i2c/busses/i2c-amd-mp2-pci.c
index c7fe3b44a860..5e4800d72e00 100644
--- a/drivers/i2c/busses/i2c-amd-mp2-pci.c
+++ b/drivers/i2c/busses/i2c-amd-mp2-pci.c
@@ -457,18 +457,12 @@ static struct pci_driver amd_mp2_pci_driver = {
 };
 module_pci_driver(amd_mp2_pci_driver);
 
-static int amd_mp2_device_match(struct device *dev, const void *data)
-{
-	return 1;
-}
-
 struct amd_mp2_dev *amd_mp2_find_device(void)
 {
 	struct device *dev;
 	struct pci_dev *pci_dev;
 
-	dev = driver_find_device(&amd_mp2_pci_driver.driver, NULL, NULL,
-				 amd_mp2_device_match);
+	dev = driver_find_next_device(&amd_mp2_pci_driver.driver, NULL);
 	if (!dev)
 		return NULL;
 
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index a3c7338fad86..dbeeb385fb9f 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -64,11 +64,6 @@ static struct resource *get_pci_domain_busn_res(int domain_nr)
 	return &r->res;
 }
 
-static int find_anything(struct device *dev, const void *data)
-{
-	return 1;
-}
-
 /*
  * Some device drivers need know if PCI is initiated.
  * Basically, we think PCI is not initiated when there
@@ -79,7 +74,7 @@ int no_pci_devices(void)
 	struct device *dev;
 	int no_devices;
 
-	dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);
+	dev = bus_find_next_device(&pci_bus_type, NULL);
 	no_devices = (dev == NULL);
 	put_device(dev);
 	return no_devices;
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index d843e362c167..0005ec9285aa 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -581,11 +581,6 @@ int ccwgroup_driver_register(struct ccwgroup_driver *cdriver)
 }
 EXPORT_SYMBOL(ccwgroup_driver_register);
 
-static int __ccwgroup_match_all(struct device *dev, const void *data)
-{
-	return 1;
-}
-
 /**
  * ccwgroup_driver_unregister() - deregister a ccw group driver
  * @cdriver: driver to be deregistered
@@ -597,8 +592,7 @@ void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver)
 	struct device *dev;
 
 	/* We don't want ccwgroup devices to live longer than their driver. */
-	while ((dev = driver_find_device(&cdriver->driver, NULL, NULL,
-					 __ccwgroup_match_all))) {
+	while ((dev = driver_find_next_device(&cdriver->driver, NULL))) {
 		struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
 
 		ccwgroup_ungroup(gdev);
diff --git a/drivers/scsi/scsi_proc.c b/drivers/scsi/scsi_proc.c
index c074631086a4..5b313226f11c 100644
--- a/drivers/scsi/scsi_proc.c
+++ b/drivers/scsi/scsi_proc.c
@@ -372,15 +372,10 @@ static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
 	return err;
 }
 
-static int always_match(struct device *dev, const void *data)
-{
-	return 1;
-}
-
 static inline struct device *next_scsi_device(struct device *start)
 {
-	struct device *next = bus_find_device(&scsi_bus_type, start, NULL,
-					      always_match);
+	struct device *next = bus_find_next_device(&scsi_bus_type, start);
+
 	put_device(start);
 	return next;
 }
diff --git a/include/linux/device.h b/include/linux/device.h
index 7514ef3d3f1a..8ae3f4b47293 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -169,6 +169,7 @@ int device_match_of_node(struct device *dev, const void *np);
 int device_match_fwnode(struct device *dev, const void *fwnode);
 int device_match_devt(struct device *dev, const void *pdevt);
 int device_match_acpi_dev(struct device *dev, const void *adev);
+int device_match_any(struct device *dev, const void *unused);
 
 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
 		     int (*fn)(struct device *dev, void *data));
@@ -225,6 +226,16 @@ static inline struct device *bus_find_device_by_devt(struct bus_type *bus,
 	return bus_find_device(bus, NULL, &devt, device_match_devt);
 }
 
+/**
+ * bus_find_next_device - Find the next device after a given device in a
+ * given bus.
+ */
+static inline struct device *
+bus_find_next_device(struct bus_type *bus,struct device *cur)
+{
+	return bus_find_device(bus, cur, NULL, device_match_any);
+}
+
 #ifdef CONFIG_ACPI
 struct acpi_device;
 
@@ -465,6 +476,12 @@ static inline struct device *driver_find_device_by_devt(struct device_driver *dr
 	return driver_find_device(drv, NULL, &devt, device_match_devt);
 }
 
+static inline struct device *driver_find_next_device(struct device_driver *drv,
+						     struct device *start)
+{
+	return driver_find_device(drv, start, NULL, device_match_any);
+}
+
 #ifdef CONFIG_ACPI
 /**
  * driver_find_device_by_acpi_dev : device iterator for locating a particular
-- 
2.21.0

[PATCH v3 7/7] platform: Add platform_find_device_by_driver() helper

[Suzuki K Poulose]

Provide a helper to lookup platform devices by matching device
driver in order to avoid drivers trying to use platform bus
internals.

Cc: Eric Anholt <eric@anholt.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Heiko Stübner" <heiko@sntech.de>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Sandy Huang <hjc@rock-chips.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/base/platform.c                     | 14 ++++++++++++++
 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 +--
 include/linux/platform_device.h             |  3 +++
 6 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 506a0175a5a7..a174ce5ea17c 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1197,6 +1197,20 @@ struct bus_type platform_bus_type = {
 };
 EXPORT_SYMBOL_GPL(platform_bus_type);
 
+/**
+ * platform_find_device_by_driver - Find a platform device with a given
+ * driver.
+ * @start: The device to start the search from.
+ * @drv: The device driver to look for.
+ */
+struct device *platform_find_device_by_driver(struct device *start,
+					      const struct device_driver *drv)
+{
+	return bus_find_device(&platform_bus_type, start, drv,
+			       (void *)platform_match);
+}
+EXPORT_SYMBOL_GPL(platform_find_device_by_driver);
+
 int __init platform_bus_init(void)
 {
 	int error;
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index 58baf49d9926..badab94be2d6 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -242,9 +242,7 @@ static struct component_match *exynos_drm_match_add(struct device *dev)
 		if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER))
 			continue;
 
-		while ((d = bus_find_device(&platform_bus_type, p,
-					    &info->driver->driver,
-					    (void *)platform_bus_type.match))) {
+		while ((d = platform_find_device_by_driver(p, &info->driver->driver))) {
 			put_device(p);
 
 			if (!(info->flags & DRM_FIMC_DEVICE) ||
@@ -412,9 +410,8 @@ static void exynos_drm_unregister_devices(void)
 		if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
 			continue;
 
-		while ((dev = bus_find_device(&platform_bus_type, NULL,
-					    &info->driver->driver,
-					    (void *)platform_bus_type.match))) {
+		while ((dev = platform_find_device_by_driver(NULL,
+						&info->driver->driver))) {
 			put_device(dev);
 			platform_device_unregister(to_platform_device(dev));
 		}
diff --git a/drivers/gpu/drm/mcde/mcde_drv.c b/drivers/gpu/drm/mcde/mcde_drv.c
index baf63fb6850a..c07abf9e201c 100644
--- a/drivers/gpu/drm/mcde/mcde_drv.c
+++ b/drivers/gpu/drm/mcde/mcde_drv.c
@@ -477,8 +477,7 @@ static int mcde_probe(struct platform_device *pdev)
 		struct device_driver *drv = &mcde_component_drivers[i]->driver;
 		struct device *p = NULL, *d;
 
-		while ((d = bus_find_device(&platform_bus_type, p, drv,
-					    (void *)platform_bus_type.match))) {
+		while ((d = platform_find_device_by_driver(p, drv))) {
 			put_device(p);
 			component_match_add(dev, &match, mcde_compare_dev, d);
 			p = d;
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index 53d2c5bd61dc..38dc26376961 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -330,8 +330,7 @@ static struct component_match *rockchip_drm_match_add(struct device *dev)
 		struct device *p = NULL, *d;
 
 		do {
-			d = bus_find_device(&platform_bus_type, p, &drv->driver,
-					    (void *)platform_bus_type.match);
+			d = platform_find_device_by_driver(p, &drv->driver);
 			put_device(p);
 			p = d;
 
diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
index bf11930e40e1..1551c8253bec 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -237,8 +237,7 @@ static void vc4_match_add_drivers(struct device *dev,
 		struct device_driver *drv = &drivers[i]->driver;
 		struct device *p = NULL, *d;
 
-		while ((d = bus_find_device(&platform_bus_type, p, drv,
-					    (void *)platform_bus_type.match))) {
+		while ((d = platform_find_device_by_driver(p, drv))) {
 			put_device(p);
 			component_match_add(dev, match, compare_dev, d);
 			p = d;
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 9bc36b589827..37e15a935a42 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -51,6 +51,9 @@ extern struct device platform_bus;
 extern void arch_setup_pdev_archdata(struct platform_device *);
 extern struct resource *platform_get_resource(struct platform_device *,
 					      unsigned int, unsigned int);
+extern struct device *
+platform_find_device_by_driver(struct device *start,
+			       const struct device_driver *drv);
 extern void __iomem *
 devm_platform_ioremap_resource(struct platform_device *pdev,
 			       unsigned int index);
-- 
2.21.0

Re: [PATCH v3 6/7] drivers: Add generic helper to match any device

[Bjorn Helgaas]

On Tue, Jul 23, 2019 at 5:19 PM Suzuki K Poulose <suzuki.poulose@arm.com> wrote:
>
> Add a generic helper to match any/all devices. Using this
> introduce new wrappers {bus/driver/class}_find_next_device().
>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Elie Morisse <syniurge@gmail.com>
> Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
> Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
> Cc: Nehal Shah <nehal-bakulchandra.shah@amd.com>
> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
> Cc: Shyam Sundar S K <shyam-sundar.s-k@amd.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>

Acked-by: Bjorn Helgaas <bhelgaas@google.com> # PCI

> ---
>  drivers/base/core.c                  |  6 ++++++
>  drivers/i2c/busses/i2c-amd-mp2-pci.c |  8 +-------
>  drivers/pci/probe.c                  |  7 +------
>  drivers/s390/cio/ccwgroup.c          |  8 +-------
>  drivers/scsi/scsi_proc.c             |  9 ++-------
>  include/linux/device.h               | 17 +++++++++++++++++
>  6 files changed, 28 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index 57d71bc2c559..e22e29b3dc97 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -3379,3 +3379,9 @@ int device_match_acpi_dev(struct device *dev, const void *adev)
>         return ACPI_COMPANION(dev) == adev;
>  }
>  EXPORT_SYMBOL(device_match_acpi_dev);
> +
> +int device_match_any(struct device *dev, const void *unused)
> +{
> +       return 1;
> +}
> +EXPORT_SYMBOL_GPL(device_match_any);
> diff --git a/drivers/i2c/busses/i2c-amd-mp2-pci.c b/drivers/i2c/busses/i2c-amd-mp2-pci.c
> index c7fe3b44a860..5e4800d72e00 100644
> --- a/drivers/i2c/busses/i2c-amd-mp2-pci.c
> +++ b/drivers/i2c/busses/i2c-amd-mp2-pci.c
> @@ -457,18 +457,12 @@ static struct pci_driver amd_mp2_pci_driver = {
>  };
>  module_pci_driver(amd_mp2_pci_driver);
>
> -static int amd_mp2_device_match(struct device *dev, const void *data)
> -{
> -       return 1;
> -}
> -
>  struct amd_mp2_dev *amd_mp2_find_device(void)
>  {
>         struct device *dev;
>         struct pci_dev *pci_dev;
>
> -       dev = driver_find_device(&amd_mp2_pci_driver.driver, NULL, NULL,
> -                                amd_mp2_device_match);
> +       dev = driver_find_next_device(&amd_mp2_pci_driver.driver, NULL);
>         if (!dev)
>                 return NULL;
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index a3c7338fad86..dbeeb385fb9f 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -64,11 +64,6 @@ static struct resource *get_pci_domain_busn_res(int domain_nr)
>         return &r->res;
>  }
>
> -static int find_anything(struct device *dev, const void *data)
> -{
> -       return 1;
> -}
> -
>  /*
>   * Some device drivers need know if PCI is initiated.
>   * Basically, we think PCI is not initiated when there
> @@ -79,7 +74,7 @@ int no_pci_devices(void)
>         struct device *dev;
>         int no_devices;
>
> -       dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);
> +       dev = bus_find_next_device(&pci_bus_type, NULL);
>         no_devices = (dev == NULL);
>         put_device(dev);
>         return no_devices;
> diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
> index d843e362c167..0005ec9285aa 100644
> --- a/drivers/s390/cio/ccwgroup.c
> +++ b/drivers/s390/cio/ccwgroup.c
> @@ -581,11 +581,6 @@ int ccwgroup_driver_register(struct ccwgroup_driver *cdriver)
>  }
>  EXPORT_SYMBOL(ccwgroup_driver_register);
>
> -static int __ccwgroup_match_all(struct device *dev, const void *data)
> -{
> -       return 1;
> -}
> -
>  /**
>   * ccwgroup_driver_unregister() - deregister a ccw group driver
>   * @cdriver: driver to be deregistered
> @@ -597,8 +592,7 @@ void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver)
>         struct device *dev;
>
>         /* We don't want ccwgroup devices to live longer than their driver. */
> -       while ((dev = driver_find_device(&cdriver->driver, NULL, NULL,
> -                                        __ccwgroup_match_all))) {
> +       while ((dev = driver_find_next_device(&cdriver->driver, NULL))) {
>                 struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
>
>                 ccwgroup_ungroup(gdev);
> diff --git a/drivers/scsi/scsi_proc.c b/drivers/scsi/scsi_proc.c
> index c074631086a4..5b313226f11c 100644
> --- a/drivers/scsi/scsi_proc.c
> +++ b/drivers/scsi/scsi_proc.c
> @@ -372,15 +372,10 @@ static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
>         return err;
>  }
>
> -static int always_match(struct device *dev, const void *data)
> -{
> -       return 1;
> -}
> -
>  static inline struct device *next_scsi_device(struct device *start)
>  {
> -       struct device *next = bus_find_device(&scsi_bus_type, start, NULL,
> -                                             always_match);
> +       struct device *next = bus_find_next_device(&scsi_bus_type, start);
> +
>         put_device(start);
>         return next;
>  }
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 7514ef3d3f1a..8ae3f4b47293 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -169,6 +169,7 @@ int device_match_of_node(struct device *dev, const void *np);
>  int device_match_fwnode(struct device *dev, const void *fwnode);
>  int device_match_devt(struct device *dev, const void *pdevt);
>  int device_match_acpi_dev(struct device *dev, const void *adev);
> +int device_match_any(struct device *dev, const void *unused);
>
>  int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
>                      int (*fn)(struct device *dev, void *data));
> @@ -225,6 +226,16 @@ static inline struct device *bus_find_device_by_devt(struct bus_type *bus,
>         return bus_find_device(bus, NULL, &devt, device_match_devt);
>  }
>
> +/**
> + * bus_find_next_device - Find the next device after a given device in a
> + * given bus.
> + */
> +static inline struct device *
> +bus_find_next_device(struct bus_type *bus,struct device *cur)
> +{
> +       return bus_find_device(bus, cur, NULL, device_match_any);
> +}
> +
>  #ifdef CONFIG_ACPI
>  struct acpi_device;
>
> @@ -465,6 +476,12 @@ static inline struct device *driver_find_device_by_devt(struct device_driver *dr
>         return driver_find_device(drv, NULL, &devt, device_match_devt);
>  }
>
> +static inline struct device *driver_find_next_device(struct device_driver *drv,
> +                                                    struct device *start)
> +{
> +       return driver_find_device(drv, start, NULL, device_match_any);
> +}
> +
>  #ifdef CONFIG_ACPI
>  /**
>   * driver_find_device_by_acpi_dev : device iterator for locating a particular
> --
> 2.21.0
>

Re: [PATCH v3 3/7] drivers: Introduce device lookup variants by fwnode

[Robin Murphy]

On 23/07/2019 23:18, Suzuki K Poulose wrote:
> Add a helper to match the firmware node handle of a device and provide
> wrappers for {bus/class/driver}_find_device() APIs to avoid proliferation
> of duplicate custom match functions.
> 
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Doug Ledford <dledford@redhat.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Cc: Jason Gunthorpe <jgg@ziepe.ca>
> Cc: linux-usb@vger.kernel.org
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Ulf Hansson <ulf.hansson@linaro.org>
> Cc: Joe Perches <joe@perches.com>
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: Robin Murphy <robin.murphy@arm.com>
> Cc: Joerg Roedel <joro@8bytes.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>   drivers/base/core.c                           |  6 +++
>   drivers/base/devcon.c                         |  8 +---
>   .../hwtracing/coresight/coresight-platform.c  | 11 +-----
>   drivers/hwtracing/coresight/coresight-priv.h  |  2 -
>   drivers/hwtracing/coresight/coresight.c       |  4 +-
>   drivers/infiniband/hw/hns/hns_roce_hw_v1.c    |  8 +---
>   drivers/iommu/arm-smmu-v3.c                   |  9 +----
>   drivers/iommu/arm-smmu.c                      |  9 +----

For the Arm SMMU drivers,

Acked-by: Robin Murphy <robin.murphy@arm.com>

>   .../ethernet/hisilicon/hns/hns_dsaf_misc.c    |  8 +---
>   drivers/usb/roles/class.c                     |  8 +---
>   drivers/usb/typec/class.c                     |  8 +---
>   include/linux/device.h                        | 39 +++++++++++++++++++
>   12 files changed, 57 insertions(+), 63 deletions(-)
> 
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index fb83647d685a..e8f81a667545 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -3368,3 +3368,9 @@ int device_match_of_node(struct device *dev, const void *np)
>   	return dev->of_node == np;
>   }
>   EXPORT_SYMBOL_GPL(device_match_of_node);
> +
> +int device_match_fwnode(struct device *dev, const void *fwnode)
> +{
> +	return dev_fwnode(dev) == fwnode;
> +}
> +EXPORT_SYMBOL_GPL(device_match_fwnode);
> diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
> index 09f28479b243..1d488dc5dd0c 100644
> --- a/drivers/base/devcon.c
> +++ b/drivers/base/devcon.c
> @@ -133,19 +133,13 @@ static struct bus_type *generic_match_buses[] = {
>   	NULL,
>   };
>   
> -static int device_fwnode_match(struct device *dev, const void *fwnode)
> -{
> -	return dev_fwnode(dev) == fwnode;
> -}
> -
>   static void *device_connection_fwnode_match(struct device_connection *con)
>   {
>   	struct bus_type *bus;
>   	struct device *dev;
>   
>   	for (bus = generic_match_buses[0]; bus; bus++) {
> -		dev = bus_find_device(bus, NULL, (void *)con->fwnode,
> -				      device_fwnode_match);
> +		dev = bus_find_device_by_fwnode(bus, con->fwnode);
>   		if (dev && !strncmp(dev_name(dev), con->id, strlen(con->id)))
>   			return dev;
>   
> diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
> index dad7d96c5943..3c5bee429105 100644
> --- a/drivers/hwtracing/coresight/coresight-platform.c
> +++ b/drivers/hwtracing/coresight/coresight-platform.c
> @@ -37,11 +37,6 @@ static int coresight_alloc_conns(struct device *dev,
>   	return 0;
>   }
>   
> -int coresight_device_fwnode_match(struct device *dev, const void *fwnode)
> -{
> -	return dev_fwnode(dev) == fwnode;
> -}
> -
>   static struct device *
>   coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
>   {
> @@ -51,8 +46,7 @@ coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
>   	 * If we have a non-configurable replicator, it will be found on the
>   	 * platform bus.
>   	 */
> -	dev = bus_find_device(&platform_bus_type, NULL,
> -			      fwnode, coresight_device_fwnode_match);
> +	dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
>   	if (dev)
>   		return dev;
>   
> @@ -60,8 +54,7 @@ coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
>   	 * 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,
> -			       fwnode, coresight_device_fwnode_match);
> +	return bus_find_device_by_fwnode(&amba_bustype, fwnode);
>   }
>   
>   #ifdef CONFIG_OF
> diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
> index 7d401790dd7e..61d7f9ff054d 100644
> --- a/drivers/hwtracing/coresight/coresight-priv.h
> +++ b/drivers/hwtracing/coresight/coresight-priv.h
> @@ -202,6 +202,4 @@ static inline void *coresight_get_uci_data(const struct amba_id *id)
>   
>   void coresight_release_platform_data(struct coresight_platform_data *pdata);
>   
> -int coresight_device_fwnode_match(struct device *dev, const void *fwnode);
> -
>   #endif
> diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
> index 55db77f6410b..6453c67a4d01 100644
> --- a/drivers/hwtracing/coresight/coresight.c
> +++ b/drivers/hwtracing/coresight/coresight.c
> @@ -1046,9 +1046,7 @@ static void coresight_fixup_device_conns(struct coresight_device *csdev)
>   		struct coresight_connection *conn = &csdev->pdata->conns[i];
>   		struct device *dev = NULL;
>   
> -		dev = bus_find_device(&coresight_bustype, NULL,
> -				      (void *)conn->child_fwnode,
> -				      coresight_device_fwnode_match);
> +		dev = bus_find_device_by_fwnode(&coresight_bustype, conn->child_fwnode);
>   		if (dev) {
>   			conn->child_dev = to_coresight_device(dev);
>   			/* and put reference from 'bus_find_device()' */
> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> index 81e6dedb1e02..fa05e943038a 100644
> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> @@ -4499,19 +4499,13 @@ static const struct acpi_device_id hns_roce_acpi_match[] = {
>   };
>   MODULE_DEVICE_TABLE(acpi, hns_roce_acpi_match);
>   
> -static int hns_roce_node_match(struct device *dev, const void *fwnode)
> -{
> -	return dev->fwnode == fwnode;
> -}
> -
>   static struct
>   platform_device *hns_roce_find_pdev(struct fwnode_handle *fwnode)
>   {
>   	struct device *dev;
>   
>   	/* get the 'device' corresponding to the matching 'fwnode' */
> -	dev = bus_find_device(&platform_bus_type, NULL,
> -			      fwnode, hns_roce_node_match);
> +	dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
>   	/* get the platform device */
>   	return dev ? to_platform_device(dev) : NULL;
>   }
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index a9a9fabd3968..6f0e13fa5e1a 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -2034,16 +2034,11 @@ arm_smmu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
>   
>   static struct platform_driver arm_smmu_driver;
>   
> -static int arm_smmu_match_node(struct device *dev, const void *data)
> -{
> -	return dev->fwnode == data;
> -}
> -
>   static
>   struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
>   {
> -	struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
> -						fwnode, arm_smmu_match_node);
> +	struct device *dev = driver_find_device_by_fwnode(&arm_smmu_driver.driver,
> +							  fwnode);
>   	put_device(dev);
>   	return dev ? dev_get_drvdata(dev) : NULL;
>   }
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index 64977c131ee6..aa06498f291d 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -1426,16 +1426,11 @@ static bool arm_smmu_capable(enum iommu_cap cap)
>   	}
>   }
>   
> -static int arm_smmu_match_node(struct device *dev, const void *data)
> -{
> -	return dev->fwnode == data;
> -}
> -
>   static
>   struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
>   {
> -	struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
> -						fwnode, arm_smmu_match_node);
> +	struct device *dev = driver_find_device_by_fwnode(&arm_smmu_driver.driver,
> +							  fwnode);
>   	put_device(dev);
>   	return dev ? dev_get_drvdata(dev) : NULL;
>   }
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
> index bb6586d0e5af..ed3829ae4ef1 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
> @@ -754,17 +754,11 @@ struct dsaf_misc_op *hns_misc_op_get(struct dsaf_device *dsaf_dev)
>   	return (void *)misc_op;
>   }
>   
> -static int hns_dsaf_dev_match(struct device *dev, const void *fwnode)
> -{
> -	return dev->fwnode == fwnode;
> -}
> -
>   struct
>   platform_device *hns_dsaf_find_platform_device(struct fwnode_handle *fwnode)
>   {
>   	struct device *dev;
>   
> -	dev = bus_find_device(&platform_bus_type, NULL,
> -			      fwnode, hns_dsaf_dev_match);
> +	dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
>   	return dev ? to_platform_device(dev) : NULL;
>   }
> diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
> index c8efe60e2465..0526efbc4922 100644
> --- a/drivers/usb/roles/class.c
> +++ b/drivers/usb/roles/class.c
> @@ -85,11 +85,6 @@ enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
>   }
>   EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
>   
> -static int switch_fwnode_match(struct device *dev, const void *fwnode)
> -{
> -	return dev_fwnode(dev) == fwnode;
> -}
> -
>   static void *usb_role_switch_match(struct device_connection *con, int ep,
>   				   void *data)
>   {
> @@ -99,8 +94,7 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
>   		if (con->id && !fwnode_property_present(con->fwnode, con->id))
>   			return NULL;
>   
> -		dev = class_find_device(role_class, NULL, con->fwnode,
> -					switch_fwnode_match);
> +		dev = class_find_device_by_fwnode(role_class, con->fwnode);
>   	} else {
>   		dev = class_find_device_by_name(role_class, con->endpoint[ep]);
>   	}
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 9b0d15b487e5..94a3eda62add 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -205,11 +205,6 @@ static void typec_altmode_put_partner(struct altmode *altmode)
>   	put_device(&adev->dev);
>   }
>   
> -static int typec_port_fwnode_match(struct device *dev, const void *fwnode)
> -{
> -	return dev_fwnode(dev) == fwnode;
> -}
> -
>   static void *typec_port_match(struct device_connection *con, int ep, void *data)
>   {
>   	struct device *dev;
> @@ -219,8 +214,7 @@ static void *typec_port_match(struct device_connection *con, int ep, void *data)
>   	 * we need to return ERR_PTR(-PROBE_DEFER) when there is no device.
>   	 */
>   	if (con->fwnode)
> -		return class_find_device(typec_class, NULL, con->fwnode,
> -					 typec_port_fwnode_match);
> +		return class_find_device_by_fwnode(typec_class, con->fwnode);
>   
>   	dev = class_find_device_by_name(typec_class, con->endpoint[ep]);
>   
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 29d8d7ad41e6..7133fc1c285d 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -166,6 +166,7 @@ void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
>   
>   int device_match_name(struct device *dev, const void *name);
>   int device_match_of_node(struct device *dev, const void *np);
> +int device_match_fwnode(struct device *dev, const void *fwnode);
>   
>   int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
>   		     int (*fn)(struct device *dev, void *data));
> @@ -198,6 +199,18 @@ 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);
>   }
>   
> +/**
> + * bus_find_device_by_fwnode : device iterator for locating a particular device
> + * matching the fwnode.
> + * @bus: bus type
> + * @fwnode: fwnode of the device to match.
> + */
> +static inline struct device *
> +bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwnode)
> +{
> +	return bus_find_device(bus, NULL, fwnode, device_match_fwnode);
> +}
> +
>   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,
> @@ -391,6 +404,19 @@ driver_find_device_by_of_node(struct device_driver *drv,
>   	return driver_find_device(drv, NULL, np, device_match_of_node);
>   }
>   
> +/**
> + * driver_find_device_by_fwnode- device iterator for locating a particular device
> + * by fwnode pointer.
> + * @driver: the driver we're iterating
> + * @fwnode: fwnode pointer to match.
> + */
> +static inline struct device *
> +driver_find_device_by_fwnode(struct device_driver *drv,
> +			     const struct fwnode_handle *fwnode)
> +{
> +	return driver_find_device(drv, NULL, fwnode, device_match_fwnode);
> +}
> +
>   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);
> @@ -544,6 +570,19 @@ 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);
>   }
>   
> +/**
> + * class_find_device_by_fwnode : device iterator for locating a particular device
> + * matching the fwnode.
> + * @class: class type
> + * @fwnode: fwnode of the device to match.
> + */
> +static inline struct device *
> +class_find_device_by_fwnode(struct class *class,
> +			    const struct fwnode_handle *fwnode)
> +{
> +	return class_find_device(class, NULL, fwnode, device_match_fwnode);
> +}
> +
>   struct class_attribute {
>   	struct attribute attr;
>   	ssize_t (*show)(struct class *class, struct class_attribute *attr,
> 

Re: [PATCH v3 7/7] platform: Add platform_find_device_by_driver() helper

[Robin Murphy]

On 23/07/2019 23:18, Suzuki K Poulose wrote:
> Provide a helper to lookup platform devices by matching device
> driver in order to avoid drivers trying to use platform bus
> internals.

FWIW, this whole drm_match_add idiom really looks like it deserves 
factoring out into an of_platform_populate-style helper, but I guess 
aligning those subtle little differences is a non-trivial challenge.

[and I am well aware of just how much of a big messy can of worms DRM 
device probing is in general]

> Cc: Eric Anholt <eric@anholt.net>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: "Heiko Stübner" <heiko@sntech.de>
> Cc: Inki Dae <inki.dae@samsung.com>
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Cc: Sandy Huang <hjc@rock-chips.com>
> Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
> Tested-by: Heiko Stuebner <heiko@sntech.de>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>   drivers/base/platform.c                     | 14 ++++++++++++++
>   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 +--
>   include/linux/platform_device.h             |  3 +++
>   6 files changed, 23 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index 506a0175a5a7..a174ce5ea17c 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -1197,6 +1197,20 @@ struct bus_type platform_bus_type = {
>   };
>   EXPORT_SYMBOL_GPL(platform_bus_type);
>   
> +/**
> + * platform_find_device_by_driver - Find a platform device with a given

Nit: "with" is easy to misinterpret there - my initial reaction to 
looking at this was "so why not just use driver_find_device()?". Maybe 
"which would match" might make it a bit clearer?

Robin.

> + * driver.
> + * @start: The device to start the search from.
> + * @drv: The device driver to look for.
> + */
> +struct device *platform_find_device_by_driver(struct device *start,
> +					      const struct device_driver *drv)
> +{
> +	return bus_find_device(&platform_bus_type, start, drv,
> +			       (void *)platform_match);
> +}
> +EXPORT_SYMBOL_GPL(platform_find_device_by_driver);
> +
>   int __init platform_bus_init(void)
>   {
>   	int error;
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> index 58baf49d9926..badab94be2d6 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> @@ -242,9 +242,7 @@ static struct component_match *exynos_drm_match_add(struct device *dev)
>   		if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER))
>   			continue;
>   
> -		while ((d = bus_find_device(&platform_bus_type, p,
> -					    &info->driver->driver,
> -					    (void *)platform_bus_type.match))) {
> +		while ((d = platform_find_device_by_driver(p, &info->driver->driver))) {
>   			put_device(p);
>   
>   			if (!(info->flags & DRM_FIMC_DEVICE) ||
> @@ -412,9 +410,8 @@ static void exynos_drm_unregister_devices(void)
>   		if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
>   			continue;
>   
> -		while ((dev = bus_find_device(&platform_bus_type, NULL,
> -					    &info->driver->driver,
> -					    (void *)platform_bus_type.match))) {
> +		while ((dev = platform_find_device_by_driver(NULL,
> +						&info->driver->driver))) {
>   			put_device(dev);
>   			platform_device_unregister(to_platform_device(dev));
>   		}
> diff --git a/drivers/gpu/drm/mcde/mcde_drv.c b/drivers/gpu/drm/mcde/mcde_drv.c
> index baf63fb6850a..c07abf9e201c 100644
> --- a/drivers/gpu/drm/mcde/mcde_drv.c
> +++ b/drivers/gpu/drm/mcde/mcde_drv.c
> @@ -477,8 +477,7 @@ static int mcde_probe(struct platform_device *pdev)
>   		struct device_driver *drv = &mcde_component_drivers[i]->driver;
>   		struct device *p = NULL, *d;
>   
> -		while ((d = bus_find_device(&platform_bus_type, p, drv,
> -					    (void *)platform_bus_type.match))) {
> +		while ((d = platform_find_device_by_driver(p, drv))) {
>   			put_device(p);
>   			component_match_add(dev, &match, mcde_compare_dev, d);
>   			p = d;
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> index 53d2c5bd61dc..38dc26376961 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -330,8 +330,7 @@ static struct component_match *rockchip_drm_match_add(struct device *dev)
>   		struct device *p = NULL, *d;
>   
>   		do {
> -			d = bus_find_device(&platform_bus_type, p, &drv->driver,
> -					    (void *)platform_bus_type.match);
> +			d = platform_find_device_by_driver(p, &drv->driver);
>   			put_device(p);
>   			p = d;
>   
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
> index bf11930e40e1..1551c8253bec 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.c
> +++ b/drivers/gpu/drm/vc4/vc4_drv.c
> @@ -237,8 +237,7 @@ static void vc4_match_add_drivers(struct device *dev,
>   		struct device_driver *drv = &drivers[i]->driver;
>   		struct device *p = NULL, *d;
>   
> -		while ((d = bus_find_device(&platform_bus_type, p, drv,
> -					    (void *)platform_bus_type.match))) {
> +		while ((d = platform_find_device_by_driver(p, drv))) {
>   			put_device(p);
>   			component_match_add(dev, match, compare_dev, d);
>   			p = d;
> diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
> index 9bc36b589827..37e15a935a42 100644
> --- a/include/linux/platform_device.h
> +++ b/include/linux/platform_device.h
> @@ -51,6 +51,9 @@ extern struct device platform_bus;
>   extern void arch_setup_pdev_archdata(struct platform_device *);
>   extern struct resource *platform_get_resource(struct platform_device *,
>   					      unsigned int, unsigned int);
> +extern struct device *
> +platform_find_device_by_driver(struct device *start,
> +			       const struct device_driver *drv);
>   extern void __iomem *
>   devm_platform_ioremap_resource(struct platform_device *pdev,
>   			       unsigned int index);
> 

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

Re: [PATCH v3 1/7] drivers: Introduce device lookup variants by name

[Alexandre Belloni]

On 23/07/2019 23:18:32+0100, Suzuki K Poulose wrote:
> Add a helper to match the device name for device lookup. Also
> reuse this generic exported helper for the existing bus_find_device_by_name().
> and add similar variants for driver/class.
> 
> 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: Arnd Bergmann <arnd@arndb.de>
> Cc: Dan Murphy <dmurphy@ti.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Harald Freudenberger <freude@linux.ibm.com>
> Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
> Cc: Jacek Anaszewski <jacek.anaszewski@gmail.com>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: linux-leds@vger.kernel.org
> Cc: linux-rtc@vger.kernel.org
> Cc: linux-usb@vger.kernel.org
> Cc: linux-wpan@vger.kernel.org
> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
> Cc: Pavel Machek <pavel@ucw.cz>
> Cc: Peter Oberparleiter <oberpar@linux.ibm.com>
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Cc: Stefan Schmidt <stefan@datenfreihafen.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

> ---
>  drivers/base/bus.c               | 24 ------------------
>  drivers/base/core.c              |  6 +++++
>  drivers/hwtracing/stm/core.c     |  9 +------
>  drivers/leds/led-class.c         |  9 +------
>  drivers/rtc/interface.c          | 11 +--------
>  drivers/s390/cio/ccwgroup.c      | 10 +-------
>  drivers/s390/cio/device.c        | 15 +-----------
>  drivers/s390/crypto/zcrypt_api.c | 11 +--------
>  drivers/usb/roles/class.c        |  8 +-----
>  drivers/usb/typec/class.c        |  8 +-----
>  include/linux/device.h           | 42 +++++++++++++++++++++++++++++---
>  net/ieee802154/core.c            |  7 +-----
>  12 files changed, 54 insertions(+), 106 deletions(-)
> 
> diff --git a/drivers/base/bus.c b/drivers/base/bus.c
> index df3cac739813..a1d1e8256324 100644
> --- a/drivers/base/bus.c
> +++ b/drivers/base/bus.c
> @@ -342,30 +342,6 @@ struct device *bus_find_device(struct bus_type *bus,
>  }
>  EXPORT_SYMBOL_GPL(bus_find_device);
>  
> -static int match_name(struct device *dev, const void *data)
> -{
> -	const char *name = data;
> -
> -	return sysfs_streq(name, dev_name(dev));
> -}
> -
> -/**
> - * bus_find_device_by_name - device iterator for locating a particular device of a specific name
> - * @bus: bus type
> - * @start: Device to begin with
> - * @name: name of the device to match
> - *
> - * This is similar to the bus_find_device() function above, but it handles
> - * searching by a name automatically, no need to write another strcmp matching
> - * function.
> - */
> -struct device *bus_find_device_by_name(struct bus_type *bus,
> -				       struct device *start, const char *name)
> -{
> -	return bus_find_device(bus, start, (void *)name, match_name);
> -}
> -EXPORT_SYMBOL_GPL(bus_find_device_by_name);
> -
>  /**
>   * subsys_find_device_by_id - find a device with a specific enumeration number
>   * @subsys: subsystem
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index da84a73f2ba6..fb83647d685a 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -3357,6 +3357,12 @@ void device_set_of_node_from_dev(struct device *dev, const struct device *dev2)
>  }
>  EXPORT_SYMBOL_GPL(device_set_of_node_from_dev);
>  
> +int device_match_name(struct device *dev, const void *name)
> +{
> +	return sysfs_streq(dev_name(dev), name);
> +}
> +EXPORT_SYMBOL_GPL(device_match_name);
> +
>  int device_match_of_node(struct device *dev, const void *np)
>  {
>  	return dev->of_node == np;
> diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
> index e55b902560de..2b6bd42632e8 100644
> --- a/drivers/hwtracing/stm/core.c
> +++ b/drivers/hwtracing/stm/core.c
> @@ -89,13 +89,6 @@ static struct class stm_class = {
>  	.dev_groups	= stm_groups,
>  };
>  
> -static int stm_dev_match(struct device *dev, const void *data)
> -{
> -	const char *name = data;
> -
> -	return sysfs_streq(name, dev_name(dev));
> -}
> -
>  /**
>   * stm_find_device() - find stm device by name
>   * @buf:	character buffer containing the name
> @@ -116,7 +109,7 @@ struct stm_device *stm_find_device(const char *buf)
>  	if (!stm_core_up)
>  		return NULL;
>  
> -	dev = class_find_device(&stm_class, NULL, buf, stm_dev_match);
> +	dev = class_find_device_by_name(&stm_class, buf);
>  	if (!dev)
>  		return NULL;
>  
> diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
> index 4793e77808e2..d54c8e4d8954 100644
> --- a/drivers/leds/led-class.c
> +++ b/drivers/leds/led-class.c
> @@ -213,13 +213,6 @@ static int led_resume(struct device *dev)
>  
>  static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume);
>  
> -static int match_name(struct device *dev, const void *data)
> -{
> -	if (!dev_name(dev))
> -		return 0;
> -	return !strcmp(dev_name(dev), (char *)data);
> -}
> -
>  static int led_classdev_next_name(const char *init_name, char *name,
>  				  size_t len)
>  {
> @@ -230,7 +223,7 @@ static int led_classdev_next_name(const char *init_name, char *name,
>  	strlcpy(name, init_name, len);
>  
>  	while ((ret < len) &&
> -	       (dev = class_find_device(leds_class, NULL, name, match_name))) {
> +	       (dev = class_find_device_by_name(leds_class, name))) {
>  		put_device(dev);
>  		ret = snprintf(name, len, "%s_%u", init_name, ++i);
>  	}
> diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
> index 72b7ddc43116..c93ef33b01d3 100644
> --- a/drivers/rtc/interface.c
> +++ b/drivers/rtc/interface.c
> @@ -663,21 +663,12 @@ void rtc_update_irq(struct rtc_device *rtc,
>  }
>  EXPORT_SYMBOL_GPL(rtc_update_irq);
>  
> -static int __rtc_match(struct device *dev, const void *data)
> -{
> -	const char *name = data;
> -
> -	if (strcmp(dev_name(dev), name) == 0)
> -		return 1;
> -	return 0;
> -}
> -
>  struct rtc_device *rtc_class_open(const char *name)
>  {
>  	struct device *dev;
>  	struct rtc_device *rtc = NULL;
>  
> -	dev = class_find_device(rtc_class, NULL, name, __rtc_match);
> +	dev = class_find_device_by_name(rtc_class, name);
>  	if (dev)
>  		rtc = to_rtc_device(dev);
>  
> diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
> index c522e9313c50..d843e362c167 100644
> --- a/drivers/s390/cio/ccwgroup.c
> +++ b/drivers/s390/cio/ccwgroup.c
> @@ -608,13 +608,6 @@ void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver)
>  }
>  EXPORT_SYMBOL(ccwgroup_driver_unregister);
>  
> -static int __ccwgroupdev_check_busid(struct device *dev, const void *id)
> -{
> -	const char *bus_id = id;
> -
> -	return (strcmp(bus_id, dev_name(dev)) == 0);
> -}
> -
>  /**
>   * get_ccwgroupdev_by_busid() - obtain device from a bus id
>   * @gdrv: driver the device is owned by
> @@ -631,8 +624,7 @@ struct ccwgroup_device *get_ccwgroupdev_by_busid(struct ccwgroup_driver *gdrv,
>  {
>  	struct device *dev;
>  
> -	dev = driver_find_device(&gdrv->driver, NULL, bus_id,
> -				 __ccwgroupdev_check_busid);
> +	dev = driver_find_device_by_name(&gdrv->driver, bus_id);
>  
>  	return dev ? to_ccwgroupdev(dev) : NULL;
>  }
> diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
> index c421899be20f..131430bd48d9 100644
> --- a/drivers/s390/cio/device.c
> +++ b/drivers/s390/cio/device.c
> @@ -1695,18 +1695,6 @@ int ccw_device_force_console(struct ccw_device *cdev)
>  EXPORT_SYMBOL_GPL(ccw_device_force_console);
>  #endif
>  
> -/*
> - * get ccw_device matching the busid, but only if owned by cdrv
> - */
> -static int
> -__ccwdev_check_busid(struct device *dev, const void *id)
> -{
> -	const char *bus_id = id;
> -
> -	return (strcmp(bus_id, dev_name(dev)) == 0);
> -}
> -
> -
>  /**
>   * get_ccwdev_by_busid() - obtain device from a bus id
>   * @cdrv: driver the device is owned by
> @@ -1723,8 +1711,7 @@ struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
>  {
>  	struct device *dev;
>  
> -	dev = driver_find_device(&cdrv->driver, NULL, (void *)bus_id,
> -				 __ccwdev_check_busid);
> +	dev = driver_find_device_by_name(&cdrv->driver, bus_id);
>  
>  	return dev ? to_ccwdev(dev) : NULL;
>  }
> diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
> index 1058b4b5cc1e..38a5a47b8c9c 100644
> --- a/drivers/s390/crypto/zcrypt_api.c
> +++ b/drivers/s390/crypto/zcrypt_api.c
> @@ -133,12 +133,6 @@ struct zcdn_device {
>  static int zcdn_create(const char *name);
>  static int zcdn_destroy(const char *name);
>  
> -/* helper function, matches the name for find_zcdndev_by_name() */
> -static int __match_zcdn_name(struct device *dev, const void *data)
> -{
> -	return strcmp(dev_name(dev), (const char *)data) == 0;
> -}
> -
>  /* helper function, matches the devt value for find_zcdndev_by_devt() */
>  static int __match_zcdn_devt(struct device *dev, const void *data)
>  {
> @@ -152,10 +146,7 @@ static int __match_zcdn_devt(struct device *dev, const void *data)
>   */
>  static inline struct zcdn_device *find_zcdndev_by_name(const char *name)
>  {
> -	struct device *dev =
> -		class_find_device(zcrypt_class, NULL,
> -				  (void *) name,
> -				  __match_zcdn_name);
> +	struct device *dev = class_find_device_by_name(zcrypt_class, name);
>  
>  	return dev ? to_zcdn_dev(dev) : NULL;
>  }
> diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
> index 86defca6623e..c8efe60e2465 100644
> --- a/drivers/usb/roles/class.c
> +++ b/drivers/usb/roles/class.c
> @@ -90,11 +90,6 @@ static int switch_fwnode_match(struct device *dev, const void *fwnode)
>  	return dev_fwnode(dev) == fwnode;
>  }
>  
> -static int switch_name_match(struct device *dev, const void *name)
> -{
> -	return !strcmp((const char *)name, dev_name(dev));
> -}
> -
>  static void *usb_role_switch_match(struct device_connection *con, int ep,
>  				   void *data)
>  {
> @@ -107,8 +102,7 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
>  		dev = class_find_device(role_class, NULL, con->fwnode,
>  					switch_fwnode_match);
>  	} else {
> -		dev = class_find_device(role_class, NULL, con->endpoint[ep],
> -					switch_name_match);
> +		dev = class_find_device_by_name(role_class, con->endpoint[ep]);
>  	}
>  
>  	return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index a18285a990a8..9b0d15b487e5 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -210,11 +210,6 @@ static int typec_port_fwnode_match(struct device *dev, const void *fwnode)
>  	return dev_fwnode(dev) == fwnode;
>  }
>  
> -static int typec_port_name_match(struct device *dev, const void *name)
> -{
> -	return !strcmp((const char *)name, dev_name(dev));
> -}
> -
>  static void *typec_port_match(struct device_connection *con, int ep, void *data)
>  {
>  	struct device *dev;
> @@ -227,8 +222,7 @@ static void *typec_port_match(struct device_connection *con, int ep, void *data)
>  		return class_find_device(typec_class, NULL, con->fwnode,
>  					 typec_port_fwnode_match);
>  
> -	dev = class_find_device(typec_class, NULL, con->endpoint[ep],
> -				typec_port_name_match);
> +	dev = class_find_device_by_name(typec_class, con->endpoint[ep]);
>  
>  	return dev ? dev : ERR_PTR(-EPROBE_DEFER);
>  }
> diff --git a/include/linux/device.h b/include/linux/device.h
> index c330b75c6c57..3ba376b8b456 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -164,6 +164,7 @@ void subsys_dev_iter_init(struct subsys_dev_iter *iter,
>  struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
>  void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
>  
> +int device_match_name(struct device *dev, const void *name);
>  int device_match_of_node(struct device *dev, const void *np);
>  
>  int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
> @@ -171,9 +172,20 @@ int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
>  struct device *bus_find_device(struct bus_type *bus, struct device *start,
>  			       const void *data,
>  			       int (*match)(struct device *dev, const void *data));
> -struct device *bus_find_device_by_name(struct bus_type *bus,
> -				       struct device *start,
> -				       const char *name);
> +/**
> + * bus_find_device_by_name - device iterator for locating a particular device
> + * of a specific name.
> + * @bus: bus type
> + * @start: Device to begin with
> + * @name: name of the device to match
> + */
> +static inline struct device *bus_find_device_by_name(struct bus_type *bus,
> +						     struct device *start,
> +						     const char *name)
> +{
> +	return bus_find_device(bus, start, name, device_match_name);
> +}
> +
>  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,
> @@ -342,6 +354,18 @@ struct device *driver_find_device(struct device_driver *drv,
>  				  struct device *start, const void *data,
>  				  int (*match)(struct device *dev, const void *data));
>  
> +/**
> + * driver_find_device_by_name - device iterator for locating a particular device
> + * of a specific name.
> + * @driver: the driver we're iterating
> + * @name: name of the device to match
> + */
> +static inline struct device *driver_find_device_by_name(struct device_driver *drv,
> +							const char *name)
> +{
> +	return driver_find_device(drv, NULL, name, device_match_name);
> +}
> +
>  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);
> @@ -471,6 +495,18 @@ extern struct device *class_find_device(struct class *class,
>  					struct device *start, const void *data,
>  					int (*match)(struct device *, const void *));
>  
> +/**
> + * class_find_device_by_name - device iterator for locating a particular device
> + * of a specific name.
> + * @class: class type
> + * @name: name of the device to match
> + */
> +static inline struct device *class_find_device_by_name(struct class *class,
> +						       const char *name)
> +{
> +	return class_find_device(class, NULL, name, device_match_name);
> +}
> +
>  struct class_attribute {
>  	struct attribute attr;
>  	ssize_t (*show)(struct class *class, struct class_attribute *attr,
> diff --git a/net/ieee802154/core.c b/net/ieee802154/core.c
> index 60b7ac56a1f5..de259b5170ab 100644
> --- a/net/ieee802154/core.c
> +++ b/net/ieee802154/core.c
> @@ -23,11 +23,6 @@
>  LIST_HEAD(cfg802154_rdev_list);
>  int cfg802154_rdev_list_generation;
>  
> -static int wpan_phy_match(struct device *dev, const void *data)
> -{
> -	return !strcmp(dev_name(dev), (const char *)data);
> -}
> -
>  struct wpan_phy *wpan_phy_find(const char *str)
>  {
>  	struct device *dev;
> @@ -35,7 +30,7 @@ struct wpan_phy *wpan_phy_find(const char *str)
>  	if (WARN_ON(!str))
>  		return NULL;
>  
> -	dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match);
> +	dev = class_find_device_by_name(&wpan_phy_class, str);
>  	if (!dev)
>  		return NULL;
>  
> -- 
> 2.21.0
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [PATCH v3 3/7] drivers: Introduce device lookup variants by fwnode

[Mathieu Poirier]

On Tue, Jul 23, 2019 at 11:18:34PM +0100, Suzuki K Poulose wrote:
> Add a helper to match the firmware node handle of a device and provide
> wrappers for {bus/class/driver}_find_device() APIs to avoid proliferation
> of duplicate custom match functions.
> 
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Doug Ledford <dledford@redhat.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Cc: Jason Gunthorpe <jgg@ziepe.ca>
> Cc: linux-usb@vger.kernel.org
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Ulf Hansson <ulf.hansson@linaro.org>
> Cc: Joe Perches <joe@perches.com>
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: Robin Murphy <robin.murphy@arm.com>
> Cc: Joerg Roedel <joro@8bytes.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
>  drivers/base/core.c                           |  6 +++
>  drivers/base/devcon.c                         |  8 +---

>  .../hwtracing/coresight/coresight-platform.c  | 11 +-----
>  drivers/hwtracing/coresight/coresight-priv.h  |  2 -
>  drivers/hwtracing/coresight/coresight.c       |  4 +-

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>

>  drivers/infiniband/hw/hns/hns_roce_hw_v1.c    |  8 +---
>  drivers/iommu/arm-smmu-v3.c                   |  9 +----
>  drivers/iommu/arm-smmu.c                      |  9 +----
>  .../ethernet/hisilicon/hns/hns_dsaf_misc.c    |  8 +---
>  drivers/usb/roles/class.c                     |  8 +---
>  drivers/usb/typec/class.c                     |  8 +---
>  include/linux/device.h                        | 39 +++++++++++++++++++
>  12 files changed, 57 insertions(+), 63 deletions(-)
> 
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index fb83647d685a..e8f81a667545 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -3368,3 +3368,9 @@ int device_match_of_node(struct device *dev, const void *np)
>  	return dev->of_node == np;
>  }
>  EXPORT_SYMBOL_GPL(device_match_of_node);
> +
> +int device_match_fwnode(struct device *dev, const void *fwnode)
> +{
> +	return dev_fwnode(dev) == fwnode;
> +}
> +EXPORT_SYMBOL_GPL(device_match_fwnode);
> diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
> index 09f28479b243..1d488dc5dd0c 100644
> --- a/drivers/base/devcon.c
> +++ b/drivers/base/devcon.c
> @@ -133,19 +133,13 @@ static struct bus_type *generic_match_buses[] = {
>  	NULL,
>  };
>  
> -static int device_fwnode_match(struct device *dev, const void *fwnode)
> -{
> -	return dev_fwnode(dev) == fwnode;
> -}
> -
>  static void *device_connection_fwnode_match(struct device_connection *con)
>  {
>  	struct bus_type *bus;
>  	struct device *dev;
>  
>  	for (bus = generic_match_buses[0]; bus; bus++) {
> -		dev = bus_find_device(bus, NULL, (void *)con->fwnode,
> -				      device_fwnode_match);
> +		dev = bus_find_device_by_fwnode(bus, con->fwnode);
>  		if (dev && !strncmp(dev_name(dev), con->id, strlen(con->id)))
>  			return dev;
>  
> diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
> index dad7d96c5943..3c5bee429105 100644
> --- a/drivers/hwtracing/coresight/coresight-platform.c
> +++ b/drivers/hwtracing/coresight/coresight-platform.c
> @@ -37,11 +37,6 @@ static int coresight_alloc_conns(struct device *dev,
>  	return 0;
>  }
>  
> -int coresight_device_fwnode_match(struct device *dev, const void *fwnode)
> -{
> -	return dev_fwnode(dev) == fwnode;
> -}
> -
>  static struct device *
>  coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
>  {
> @@ -51,8 +46,7 @@ coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
>  	 * If we have a non-configurable replicator, it will be found on the
>  	 * platform bus.
>  	 */
> -	dev = bus_find_device(&platform_bus_type, NULL,
> -			      fwnode, coresight_device_fwnode_match);
> +	dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
>  	if (dev)
>  		return dev;
>  
> @@ -60,8 +54,7 @@ coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
>  	 * 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,
> -			       fwnode, coresight_device_fwnode_match);
> +	return bus_find_device_by_fwnode(&amba_bustype, fwnode);
>  }
>  
>  #ifdef CONFIG_OF
> diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
> index 7d401790dd7e..61d7f9ff054d 100644
> --- a/drivers/hwtracing/coresight/coresight-priv.h
> +++ b/drivers/hwtracing/coresight/coresight-priv.h
> @@ -202,6 +202,4 @@ static inline void *coresight_get_uci_data(const struct amba_id *id)
>  
>  void coresight_release_platform_data(struct coresight_platform_data *pdata);
>  
> -int coresight_device_fwnode_match(struct device *dev, const void *fwnode);
> -
>  #endif
> diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
> index 55db77f6410b..6453c67a4d01 100644
> --- a/drivers/hwtracing/coresight/coresight.c
> +++ b/drivers/hwtracing/coresight/coresight.c
> @@ -1046,9 +1046,7 @@ static void coresight_fixup_device_conns(struct coresight_device *csdev)
>  		struct coresight_connection *conn = &csdev->pdata->conns[i];
>  		struct device *dev = NULL;
>  
> -		dev = bus_find_device(&coresight_bustype, NULL,
> -				      (void *)conn->child_fwnode,
> -				      coresight_device_fwnode_match);
> +		dev = bus_find_device_by_fwnode(&coresight_bustype, conn->child_fwnode);
>  		if (dev) {
>  			conn->child_dev = to_coresight_device(dev);
>  			/* and put reference from 'bus_find_device()' */
> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> index 81e6dedb1e02..fa05e943038a 100644
> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> @@ -4499,19 +4499,13 @@ static const struct acpi_device_id hns_roce_acpi_match[] = {
>  };
>  MODULE_DEVICE_TABLE(acpi, hns_roce_acpi_match);
>  
> -static int hns_roce_node_match(struct device *dev, const void *fwnode)
> -{
> -	return dev->fwnode == fwnode;
> -}
> -
>  static struct
>  platform_device *hns_roce_find_pdev(struct fwnode_handle *fwnode)
>  {
>  	struct device *dev;
>  
>  	/* get the 'device' corresponding to the matching 'fwnode' */
> -	dev = bus_find_device(&platform_bus_type, NULL,
> -			      fwnode, hns_roce_node_match);
> +	dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
>  	/* get the platform device */
>  	return dev ? to_platform_device(dev) : NULL;
>  }
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index a9a9fabd3968..6f0e13fa5e1a 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -2034,16 +2034,11 @@ arm_smmu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
>  
>  static struct platform_driver arm_smmu_driver;
>  
> -static int arm_smmu_match_node(struct device *dev, const void *data)
> -{
> -	return dev->fwnode == data;
> -}
> -
>  static
>  struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
>  {
> -	struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
> -						fwnode, arm_smmu_match_node);
> +	struct device *dev = driver_find_device_by_fwnode(&arm_smmu_driver.driver,
> +							  fwnode);
>  	put_device(dev);
>  	return dev ? dev_get_drvdata(dev) : NULL;
>  }
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index 64977c131ee6..aa06498f291d 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -1426,16 +1426,11 @@ static bool arm_smmu_capable(enum iommu_cap cap)
>  	}
>  }
>  
> -static int arm_smmu_match_node(struct device *dev, const void *data)
> -{
> -	return dev->fwnode == data;
> -}
> -
>  static
>  struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
>  {
> -	struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
> -						fwnode, arm_smmu_match_node);
> +	struct device *dev = driver_find_device_by_fwnode(&arm_smmu_driver.driver,
> +							  fwnode);
>  	put_device(dev);
>  	return dev ? dev_get_drvdata(dev) : NULL;
>  }
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
> index bb6586d0e5af..ed3829ae4ef1 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
> @@ -754,17 +754,11 @@ struct dsaf_misc_op *hns_misc_op_get(struct dsaf_device *dsaf_dev)
>  	return (void *)misc_op;
>  }
>  
> -static int hns_dsaf_dev_match(struct device *dev, const void *fwnode)
> -{
> -	return dev->fwnode == fwnode;
> -}
> -
>  struct
>  platform_device *hns_dsaf_find_platform_device(struct fwnode_handle *fwnode)
>  {
>  	struct device *dev;
>  
> -	dev = bus_find_device(&platform_bus_type, NULL,
> -			      fwnode, hns_dsaf_dev_match);
> +	dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
>  	return dev ? to_platform_device(dev) : NULL;
>  }
> diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
> index c8efe60e2465..0526efbc4922 100644
> --- a/drivers/usb/roles/class.c
> +++ b/drivers/usb/roles/class.c
> @@ -85,11 +85,6 @@ enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
>  }
>  EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
>  
> -static int switch_fwnode_match(struct device *dev, const void *fwnode)
> -{
> -	return dev_fwnode(dev) == fwnode;
> -}
> -
>  static void *usb_role_switch_match(struct device_connection *con, int ep,
>  				   void *data)
>  {
> @@ -99,8 +94,7 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
>  		if (con->id && !fwnode_property_present(con->fwnode, con->id))
>  			return NULL;
>  
> -		dev = class_find_device(role_class, NULL, con->fwnode,
> -					switch_fwnode_match);
> +		dev = class_find_device_by_fwnode(role_class, con->fwnode);
>  	} else {
>  		dev = class_find_device_by_name(role_class, con->endpoint[ep]);
>  	}
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 9b0d15b487e5..94a3eda62add 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -205,11 +205,6 @@ static void typec_altmode_put_partner(struct altmode *altmode)
>  	put_device(&adev->dev);
>  }
>  
> -static int typec_port_fwnode_match(struct device *dev, const void *fwnode)
> -{
> -	return dev_fwnode(dev) == fwnode;
> -}
> -
>  static void *typec_port_match(struct device_connection *con, int ep, void *data)
>  {
>  	struct device *dev;
> @@ -219,8 +214,7 @@ static void *typec_port_match(struct device_connection *con, int ep, void *data)
>  	 * we need to return ERR_PTR(-PROBE_DEFER) when there is no device.
>  	 */
>  	if (con->fwnode)
> -		return class_find_device(typec_class, NULL, con->fwnode,
> -					 typec_port_fwnode_match);
> +		return class_find_device_by_fwnode(typec_class, con->fwnode);
>  
>  	dev = class_find_device_by_name(typec_class, con->endpoint[ep]);
>  
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 29d8d7ad41e6..7133fc1c285d 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -166,6 +166,7 @@ void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
>  
>  int device_match_name(struct device *dev, const void *name);
>  int device_match_of_node(struct device *dev, const void *np);
> +int device_match_fwnode(struct device *dev, const void *fwnode);
>  
>  int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
>  		     int (*fn)(struct device *dev, void *data));
> @@ -198,6 +199,18 @@ 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);
>  }
>  
> +/**
> + * bus_find_device_by_fwnode : device iterator for locating a particular device
> + * matching the fwnode.
> + * @bus: bus type
> + * @fwnode: fwnode of the device to match.
> + */
> +static inline struct device *
> +bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwnode)
> +{
> +	return bus_find_device(bus, NULL, fwnode, device_match_fwnode);
> +}
> +
>  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,
> @@ -391,6 +404,19 @@ driver_find_device_by_of_node(struct device_driver *drv,
>  	return driver_find_device(drv, NULL, np, device_match_of_node);
>  }
>  
> +/**
> + * driver_find_device_by_fwnode- device iterator for locating a particular device
> + * by fwnode pointer.
> + * @driver: the driver we're iterating
> + * @fwnode: fwnode pointer to match.
> + */
> +static inline struct device *
> +driver_find_device_by_fwnode(struct device_driver *drv,
> +			     const struct fwnode_handle *fwnode)
> +{
> +	return driver_find_device(drv, NULL, fwnode, device_match_fwnode);
> +}
> +
>  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);
> @@ -544,6 +570,19 @@ 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);
>  }
>  
> +/**
> + * class_find_device_by_fwnode : device iterator for locating a particular device
> + * matching the fwnode.
> + * @class: class type
> + * @fwnode: fwnode of the device to match.
> + */
> +static inline struct device *
> +class_find_device_by_fwnode(struct class *class,
> +			    const struct fwnode_handle *fwnode)
> +{
> +	return class_find_device(class, NULL, fwnode, device_match_fwnode);
> +}
> +
>  struct class_attribute {
>  	struct attribute attr;
>  	ssize_t (*show)(struct class *class, struct class_attribute *attr,
> -- 
> 2.21.0
> 

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

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 1952 bytes --]

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>

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Re: [PATCH v3 5/7] drivers: Introduce device lookup variants by ACPI_COMPANION device

[Mark Brown]

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On Tue, Jul 23, 2019 at 11:18:36PM +0100, Suzuki K Poulose wrote:
> Add a generic helper to match a device by the ACPI_COMPANION device
> and provide wrappers for the device lookup APIs.

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

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Re: [PATCH v3 5/7] drivers: Introduce device lookup variants by ACPI_COMPANION device

[Wolfram Sang]

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On Tue, Jul 23, 2019 at 11:18:36PM +0100, Suzuki K Poulose wrote:
> Add a generic helper to match a device by the ACPI_COMPANION device
> and provide wrappers for the device lookup APIs.
> 
> Cc: Len Brown <lenb@kernel.org>
> Cc: linux-acpi@vger.kernel.org
> Cc: linux-spi@vger.kernel.org
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
> Cc: Wolfram Sang <wsa@the-dreams.de>
> Cc: linux-i2c@vger.kernel.org
> Cc: Mark Brown <broonie@kernel.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>

From my side, OK:

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

yet you missed to cc the I2C ACPI maintainers. Done so now.

> ---
>  drivers/base/core.c         |  6 ++++
>  drivers/i2c/i2c-core-acpi.c | 11 ++-----
>  drivers/spi/spi.c           |  8 +----
>  include/linux/device.h      | 65 +++++++++++++++++++++++++++++++++++++
>  4 files changed, 74 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index 3abc32b60c0a..57d71bc2c559 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -3373,3 +3373,9 @@ int device_match_devt(struct device *dev, const void *pdevt)
>  	return dev->devt == *(dev_t *)pdevt;
>  }
>  EXPORT_SYMBOL_GPL(device_match_devt);
> +
> +int device_match_acpi_dev(struct device *dev, const void *adev)
> +{
> +	return ACPI_COMPANION(dev) == adev;
> +}
> +EXPORT_SYMBOL(device_match_acpi_dev);
> diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
> index 4dbbc9a35f65..bc80aafb521f 100644
> --- a/drivers/i2c/i2c-core-acpi.c
> +++ b/drivers/i2c/i2c-core-acpi.c
> @@ -354,17 +354,11 @@ static int i2c_acpi_find_match_adapter(struct device *dev, const void *data)
>  	return ACPI_HANDLE(dev) == (acpi_handle)data;
>  }
>  
> -static int i2c_acpi_find_match_device(struct device *dev, const void *data)
> -{
> -	return ACPI_COMPANION(dev) == data;
> -}
>  
>  struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
>  {
> -	struct device *dev;
> +	struct device *dev = bus_find_device_by_acpi_dev(&i2c_bus_type, handle);
>  
> -	dev = bus_find_device(&i2c_bus_type, NULL, handle,
> -			      i2c_acpi_find_match_adapter);
>  	return dev ? i2c_verify_adapter(dev) : NULL;
>  }
>  EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle);
> @@ -373,8 +367,7 @@ static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev)
>  {
>  	struct device *dev;
>  
> -	dev = bus_find_device(&i2c_bus_type, NULL, adev,
> -			      i2c_acpi_find_match_device);
> +	dev = bus_find_device_by_acpi_dev(&i2c_bus_type, adev);
>  	return dev ? i2c_verify_client(dev) : NULL;
>  }
>  
> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
> index a591da87981a..c486a6f84c2c 100644
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -3741,11 +3741,6 @@ static int spi_acpi_controller_match(struct device *dev, const void *data)
>  	return ACPI_COMPANION(dev->parent) == data;
>  }
>  
> -static int spi_acpi_device_match(struct device *dev, const void *data)
> -{
> -	return ACPI_COMPANION(dev) == data;
> -}
> -
>  static struct spi_controller *acpi_spi_find_controller_by_adev(struct acpi_device *adev)
>  {
>  	struct device *dev;
> @@ -3765,8 +3760,7 @@ static struct spi_device *acpi_spi_find_device_by_adev(struct acpi_device *adev)
>  {
>  	struct device *dev;
>  
> -	dev = bus_find_device(&spi_bus_type, NULL, adev, spi_acpi_device_match);
> -
> +	dev = bus_find_device_by_acpi_dev(&spi_bus_type, adev);
>  	return dev ? to_spi_device(dev) : NULL;
>  }
>  
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 93b2f55ef44e..7514ef3d3f1a 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -168,6 +168,7 @@ int device_match_name(struct device *dev, const void *name);
>  int device_match_of_node(struct device *dev, const void *np);
>  int device_match_fwnode(struct device *dev, const void *fwnode);
>  int device_match_devt(struct device *dev, const void *pdevt);
> +int device_match_acpi_dev(struct device *dev, const void *adev);
>  
>  int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
>  		     int (*fn)(struct device *dev, void *data));
> @@ -224,6 +225,28 @@ static inline struct device *bus_find_device_by_devt(struct bus_type *bus,
>  	return bus_find_device(bus, NULL, &devt, device_match_devt);
>  }
>  
> +#ifdef CONFIG_ACPI
> +struct acpi_device;
> +
> +/**
> + * bus_find_device_by_acpi_dev : device iterator for locating a particular device
> + * matching the ACPI COMPANION device.
> + * @bus: bus type
> + * @adev: ACPI COMPANION device to match.
> + */
> +static inline struct device *
> +bus_find_device_by_acpi_dev(struct bus_type *bus, const struct acpi_device *adev)
> +{
> +	return bus_find_device(bus, NULL, adev, device_match_acpi_dev);
> +}
> +#else
> +static inline struct device *
> +bus_find_device_by_acpi_dev(struct bus_type *bus, const void *adev)
> +{
> +	return NULL;
> +}
> +#endif
> +
>  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,
> @@ -442,6 +465,27 @@ static inline struct device *driver_find_device_by_devt(struct device_driver *dr
>  	return driver_find_device(drv, NULL, &devt, device_match_devt);
>  }
>  
> +#ifdef CONFIG_ACPI
> +/**
> + * driver_find_device_by_acpi_dev : device iterator for locating a particular
> + * device matching the ACPI_COMPANION device.
> + * @driver: the driver we're iterating
> + * @adev: ACPI_COMPANION device to match.
> + */
> +static inline struct device *
> +driver_find_device_by_acpi_dev(struct device_driver *drv,
> +			       const struct acpi_device *adev)
> +{
> +	return driver_find_device(drv, NULL, adev, device_match_acpi_dev);
> +}
> +#else
> +static inline struct device *
> +driver_find_device_by_acpi_dev(struct device_driver *drv, const void *adev)
> +{
> +	return NULL;
> +}
> +#endif
> +
>  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);
> @@ -620,6 +664,27 @@ static inline struct device *class_find_device_by_devt(struct class *class,
>  	return class_find_device(class, NULL, &devt, device_match_devt);
>  }
>  
> +#ifdef CONFIG_ACPI
> +struct acpi_device;
> +/**
> + * class_find_device_by_acpi_dev : device iterator for locating a particular
> + * device matching the ACPI_COMPANION device.
> + * @class: class type
> + * @adev: ACPI_COMPANION device to match.
> + */
> +static inline struct device *
> +class_find_device_by_acpi_dev(struct class *class, const struct acpi_device *adev)
> +{
> +	return class_find_device(class, NULL, adev, device_match_acpi_dev);
> +}
> +#else
> +static inline struct device *
> +class_find_device_by_acpi_dev(struct class *class, const void *adev)
> +{
> +	return NULL;
> +}
> +#endif
> +
>  struct class_attribute {
>  	struct attribute attr;
>  	ssize_t (*show)(struct class *class, struct class_attribute *attr,
> -- 
> 2.21.0
> 

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Re: [PATCH v3 3/7] drivers: Introduce device lookup variants by fwnode

[Heikki Krogerus]

On Tue, Jul 23, 2019 at 11:18:34PM +0100, Suzuki K Poulose wrote:
> Add a helper to match the firmware node handle of a device and provide
> wrappers for {bus/class/driver}_find_device() APIs to avoid proliferation
> of duplicate custom match functions.
> 
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Doug Ledford <dledford@redhat.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Cc: Jason Gunthorpe <jgg@ziepe.ca>
> Cc: linux-usb@vger.kernel.org
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Ulf Hansson <ulf.hansson@linaro.org>
> Cc: Joe Perches <joe@perches.com>
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: Robin Murphy <robin.murphy@arm.com>
> Cc: Joerg Roedel <joro@8bytes.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> ---
>  drivers/base/core.c                           |  6 +++
>  drivers/base/devcon.c                         |  8 +---
>  .../hwtracing/coresight/coresight-platform.c  | 11 +-----
>  drivers/hwtracing/coresight/coresight-priv.h  |  2 -
>  drivers/hwtracing/coresight/coresight.c       |  4 +-
>  drivers/infiniband/hw/hns/hns_roce_hw_v1.c    |  8 +---
>  drivers/iommu/arm-smmu-v3.c                   |  9 +----
>  drivers/iommu/arm-smmu.c                      |  9 +----
>  .../ethernet/hisilicon/hns/hns_dsaf_misc.c    |  8 +---
>  drivers/usb/roles/class.c                     |  8 +---
>  drivers/usb/typec/class.c                     |  8 +---
>  include/linux/device.h                        | 39 +++++++++++++++++++
>  12 files changed, 57 insertions(+), 63 deletions(-)
> 
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index fb83647d685a..e8f81a667545 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -3368,3 +3368,9 @@ int device_match_of_node(struct device *dev, const void *np)
>  	return dev->of_node == np;
>  }
>  EXPORT_SYMBOL_GPL(device_match_of_node);
> +
> +int device_match_fwnode(struct device *dev, const void *fwnode)
> +{
> +	return dev_fwnode(dev) == fwnode;
> +}
> +EXPORT_SYMBOL_GPL(device_match_fwnode);
> diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
> index 09f28479b243..1d488dc5dd0c 100644
> --- a/drivers/base/devcon.c
> +++ b/drivers/base/devcon.c
> @@ -133,19 +133,13 @@ static struct bus_type *generic_match_buses[] = {
>  	NULL,
>  };
>  
> -static int device_fwnode_match(struct device *dev, const void *fwnode)
> -{
> -	return dev_fwnode(dev) == fwnode;
> -}
> -
>  static void *device_connection_fwnode_match(struct device_connection *con)
>  {
>  	struct bus_type *bus;
>  	struct device *dev;
>  
>  	for (bus = generic_match_buses[0]; bus; bus++) {
> -		dev = bus_find_device(bus, NULL, (void *)con->fwnode,
> -				      device_fwnode_match);
> +		dev = bus_find_device_by_fwnode(bus, con->fwnode);
>  		if (dev && !strncmp(dev_name(dev), con->id, strlen(con->id)))
>  			return dev;
>  
> diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
> index dad7d96c5943..3c5bee429105 100644
> --- a/drivers/hwtracing/coresight/coresight-platform.c
> +++ b/drivers/hwtracing/coresight/coresight-platform.c
> @@ -37,11 +37,6 @@ static int coresight_alloc_conns(struct device *dev,
>  	return 0;
>  }
>  
> -int coresight_device_fwnode_match(struct device *dev, const void *fwnode)
> -{
> -	return dev_fwnode(dev) == fwnode;
> -}
> -
>  static struct device *
>  coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
>  {
> @@ -51,8 +46,7 @@ coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
>  	 * If we have a non-configurable replicator, it will be found on the
>  	 * platform bus.
>  	 */
> -	dev = bus_find_device(&platform_bus_type, NULL,
> -			      fwnode, coresight_device_fwnode_match);
> +	dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
>  	if (dev)
>  		return dev;
>  
> @@ -60,8 +54,7 @@ coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
>  	 * 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,
> -			       fwnode, coresight_device_fwnode_match);
> +	return bus_find_device_by_fwnode(&amba_bustype, fwnode);
>  }
>  
>  #ifdef CONFIG_OF
> diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
> index 7d401790dd7e..61d7f9ff054d 100644
> --- a/drivers/hwtracing/coresight/coresight-priv.h
> +++ b/drivers/hwtracing/coresight/coresight-priv.h
> @@ -202,6 +202,4 @@ static inline void *coresight_get_uci_data(const struct amba_id *id)
>  
>  void coresight_release_platform_data(struct coresight_platform_data *pdata);
>  
> -int coresight_device_fwnode_match(struct device *dev, const void *fwnode);
> -
>  #endif
> diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
> index 55db77f6410b..6453c67a4d01 100644
> --- a/drivers/hwtracing/coresight/coresight.c
> +++ b/drivers/hwtracing/coresight/coresight.c
> @@ -1046,9 +1046,7 @@ static void coresight_fixup_device_conns(struct coresight_device *csdev)
>  		struct coresight_connection *conn = &csdev->pdata->conns[i];
>  		struct device *dev = NULL;
>  
> -		dev = bus_find_device(&coresight_bustype, NULL,
> -				      (void *)conn->child_fwnode,
> -				      coresight_device_fwnode_match);
> +		dev = bus_find_device_by_fwnode(&coresight_bustype, conn->child_fwnode);
>  		if (dev) {
>  			conn->child_dev = to_coresight_device(dev);
>  			/* and put reference from 'bus_find_device()' */
> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> index 81e6dedb1e02..fa05e943038a 100644
> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> @@ -4499,19 +4499,13 @@ static const struct acpi_device_id hns_roce_acpi_match[] = {
>  };
>  MODULE_DEVICE_TABLE(acpi, hns_roce_acpi_match);
>  
> -static int hns_roce_node_match(struct device *dev, const void *fwnode)
> -{
> -	return dev->fwnode == fwnode;
> -}
> -
>  static struct
>  platform_device *hns_roce_find_pdev(struct fwnode_handle *fwnode)
>  {
>  	struct device *dev;
>  
>  	/* get the 'device' corresponding to the matching 'fwnode' */
> -	dev = bus_find_device(&platform_bus_type, NULL,
> -			      fwnode, hns_roce_node_match);
> +	dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
>  	/* get the platform device */
>  	return dev ? to_platform_device(dev) : NULL;
>  }
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index a9a9fabd3968..6f0e13fa5e1a 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -2034,16 +2034,11 @@ arm_smmu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
>  
>  static struct platform_driver arm_smmu_driver;
>  
> -static int arm_smmu_match_node(struct device *dev, const void *data)
> -{
> -	return dev->fwnode == data;
> -}
> -
>  static
>  struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
>  {
> -	struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
> -						fwnode, arm_smmu_match_node);
> +	struct device *dev = driver_find_device_by_fwnode(&arm_smmu_driver.driver,
> +							  fwnode);
>  	put_device(dev);
>  	return dev ? dev_get_drvdata(dev) : NULL;
>  }
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index 64977c131ee6..aa06498f291d 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -1426,16 +1426,11 @@ static bool arm_smmu_capable(enum iommu_cap cap)
>  	}
>  }
>  
> -static int arm_smmu_match_node(struct device *dev, const void *data)
> -{
> -	return dev->fwnode == data;
> -}
> -
>  static
>  struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
>  {
> -	struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
> -						fwnode, arm_smmu_match_node);
> +	struct device *dev = driver_find_device_by_fwnode(&arm_smmu_driver.driver,
> +							  fwnode);
>  	put_device(dev);
>  	return dev ? dev_get_drvdata(dev) : NULL;
>  }
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
> index bb6586d0e5af..ed3829ae4ef1 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
> @@ -754,17 +754,11 @@ struct dsaf_misc_op *hns_misc_op_get(struct dsaf_device *dsaf_dev)
>  	return (void *)misc_op;
>  }
>  
> -static int hns_dsaf_dev_match(struct device *dev, const void *fwnode)
> -{
> -	return dev->fwnode == fwnode;
> -}
> -
>  struct
>  platform_device *hns_dsaf_find_platform_device(struct fwnode_handle *fwnode)
>  {
>  	struct device *dev;
>  
> -	dev = bus_find_device(&platform_bus_type, NULL,
> -			      fwnode, hns_dsaf_dev_match);
> +	dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
>  	return dev ? to_platform_device(dev) : NULL;
>  }
> diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
> index c8efe60e2465..0526efbc4922 100644
> --- a/drivers/usb/roles/class.c
> +++ b/drivers/usb/roles/class.c
> @@ -85,11 +85,6 @@ enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
>  }
>  EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
>  
> -static int switch_fwnode_match(struct device *dev, const void *fwnode)
> -{
> -	return dev_fwnode(dev) == fwnode;
> -}
> -
>  static void *usb_role_switch_match(struct device_connection *con, int ep,
>  				   void *data)
>  {
> @@ -99,8 +94,7 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
>  		if (con->id && !fwnode_property_present(con->fwnode, con->id))
>  			return NULL;
>  
> -		dev = class_find_device(role_class, NULL, con->fwnode,
> -					switch_fwnode_match);
> +		dev = class_find_device_by_fwnode(role_class, con->fwnode);
>  	} else {
>  		dev = class_find_device_by_name(role_class, con->endpoint[ep]);
>  	}
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 9b0d15b487e5..94a3eda62add 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -205,11 +205,6 @@ static void typec_altmode_put_partner(struct altmode *altmode)
>  	put_device(&adev->dev);
>  }
>  
> -static int typec_port_fwnode_match(struct device *dev, const void *fwnode)
> -{
> -	return dev_fwnode(dev) == fwnode;
> -}
> -
>  static void *typec_port_match(struct device_connection *con, int ep, void *data)
>  {
>  	struct device *dev;
> @@ -219,8 +214,7 @@ static void *typec_port_match(struct device_connection *con, int ep, void *data)
>  	 * we need to return ERR_PTR(-PROBE_DEFER) when there is no device.
>  	 */
>  	if (con->fwnode)
> -		return class_find_device(typec_class, NULL, con->fwnode,
> -					 typec_port_fwnode_match);
> +		return class_find_device_by_fwnode(typec_class, con->fwnode);
>  
>  	dev = class_find_device_by_name(typec_class, con->endpoint[ep]);
>  
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 29d8d7ad41e6..7133fc1c285d 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -166,6 +166,7 @@ void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
>  
>  int device_match_name(struct device *dev, const void *name);
>  int device_match_of_node(struct device *dev, const void *np);
> +int device_match_fwnode(struct device *dev, const void *fwnode);
>  
>  int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
>  		     int (*fn)(struct device *dev, void *data));
> @@ -198,6 +199,18 @@ 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);
>  }
>  
> +/**
> + * bus_find_device_by_fwnode : device iterator for locating a particular device
> + * matching the fwnode.
> + * @bus: bus type
> + * @fwnode: fwnode of the device to match.
> + */
> +static inline struct device *
> +bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwnode)
> +{
> +	return bus_find_device(bus, NULL, fwnode, device_match_fwnode);
> +}
> +
>  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,
> @@ -391,6 +404,19 @@ driver_find_device_by_of_node(struct device_driver *drv,
>  	return driver_find_device(drv, NULL, np, device_match_of_node);
>  }
>  
> +/**
> + * driver_find_device_by_fwnode- device iterator for locating a particular device
> + * by fwnode pointer.
> + * @driver: the driver we're iterating
> + * @fwnode: fwnode pointer to match.
> + */
> +static inline struct device *
> +driver_find_device_by_fwnode(struct device_driver *drv,
> +			     const struct fwnode_handle *fwnode)
> +{
> +	return driver_find_device(drv, NULL, fwnode, device_match_fwnode);
> +}
> +
>  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);
> @@ -544,6 +570,19 @@ 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);
>  }
>  
> +/**
> + * class_find_device_by_fwnode : device iterator for locating a particular device
> + * matching the fwnode.
> + * @class: class type
> + * @fwnode: fwnode of the device to match.
> + */
> +static inline struct device *
> +class_find_device_by_fwnode(struct class *class,
> +			    const struct fwnode_handle *fwnode)
> +{
> +	return class_find_device(class, NULL, fwnode, device_match_fwnode);
> +}
> +
>  struct class_attribute {
>  	struct attribute attr;
>  	ssize_t (*show)(struct class *class, struct class_attribute *attr,
> -- 
> 2.21.0

thanks,

-- 
heikki

Re: [PATCH v3 1/7] drivers: Introduce device lookup variants by name

[Heikki Krogerus]

On Tue, Jul 23, 2019 at 11:18:32PM +0100, Suzuki K Poulose wrote:
> Add a helper to match the device name for device lookup. Also
> reuse this generic exported helper for the existing bus_find_device_by_name().
> and add similar variants for driver/class.
> 
> 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: Arnd Bergmann <arnd@arndb.de>
> Cc: Dan Murphy <dmurphy@ti.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Harald Freudenberger <freude@linux.ibm.com>
> Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
> Cc: Jacek Anaszewski <jacek.anaszewski@gmail.com>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: linux-leds@vger.kernel.org
> Cc: linux-rtc@vger.kernel.org
> Cc: linux-usb@vger.kernel.org
> Cc: linux-wpan@vger.kernel.org
> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
> Cc: Pavel Machek <pavel@ucw.cz>
> Cc: Peter Oberparleiter <oberpar@linux.ibm.com>
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Cc: Stefan Schmidt <stefan@datenfreihafen.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.coM>

> ---
>  drivers/base/bus.c               | 24 ------------------
>  drivers/base/core.c              |  6 +++++
>  drivers/hwtracing/stm/core.c     |  9 +------
>  drivers/leds/led-class.c         |  9 +------
>  drivers/rtc/interface.c          | 11 +--------
>  drivers/s390/cio/ccwgroup.c      | 10 +-------
>  drivers/s390/cio/device.c        | 15 +-----------
>  drivers/s390/crypto/zcrypt_api.c | 11 +--------
>  drivers/usb/roles/class.c        |  8 +-----
>  drivers/usb/typec/class.c        |  8 +-----
>  include/linux/device.h           | 42 +++++++++++++++++++++++++++++---
>  net/ieee802154/core.c            |  7 +-----
>  12 files changed, 54 insertions(+), 106 deletions(-)
> 
> diff --git a/drivers/base/bus.c b/drivers/base/bus.c
> index df3cac739813..a1d1e8256324 100644
> --- a/drivers/base/bus.c
> +++ b/drivers/base/bus.c
> @@ -342,30 +342,6 @@ struct device *bus_find_device(struct bus_type *bus,
>  }
>  EXPORT_SYMBOL_GPL(bus_find_device);
>  
> -static int match_name(struct device *dev, const void *data)
> -{
> -	const char *name = data;
> -
> -	return sysfs_streq(name, dev_name(dev));
> -}
> -
> -/**
> - * bus_find_device_by_name - device iterator for locating a particular device of a specific name
> - * @bus: bus type
> - * @start: Device to begin with
> - * @name: name of the device to match
> - *
> - * This is similar to the bus_find_device() function above, but it handles
> - * searching by a name automatically, no need to write another strcmp matching
> - * function.
> - */
> -struct device *bus_find_device_by_name(struct bus_type *bus,
> -				       struct device *start, const char *name)
> -{
> -	return bus_find_device(bus, start, (void *)name, match_name);
> -}
> -EXPORT_SYMBOL_GPL(bus_find_device_by_name);
> -
>  /**
>   * subsys_find_device_by_id - find a device with a specific enumeration number
>   * @subsys: subsystem
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index da84a73f2ba6..fb83647d685a 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -3357,6 +3357,12 @@ void device_set_of_node_from_dev(struct device *dev, const struct device *dev2)
>  }
>  EXPORT_SYMBOL_GPL(device_set_of_node_from_dev);
>  
> +int device_match_name(struct device *dev, const void *name)
> +{
> +	return sysfs_streq(dev_name(dev), name);
> +}
> +EXPORT_SYMBOL_GPL(device_match_name);
> +
>  int device_match_of_node(struct device *dev, const void *np)
>  {
>  	return dev->of_node == np;
> diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
> index e55b902560de..2b6bd42632e8 100644
> --- a/drivers/hwtracing/stm/core.c
> +++ b/drivers/hwtracing/stm/core.c
> @@ -89,13 +89,6 @@ static struct class stm_class = {
>  	.dev_groups	= stm_groups,
>  };
>  
> -static int stm_dev_match(struct device *dev, const void *data)
> -{
> -	const char *name = data;
> -
> -	return sysfs_streq(name, dev_name(dev));
> -}
> -
>  /**
>   * stm_find_device() - find stm device by name
>   * @buf:	character buffer containing the name
> @@ -116,7 +109,7 @@ struct stm_device *stm_find_device(const char *buf)
>  	if (!stm_core_up)
>  		return NULL;
>  
> -	dev = class_find_device(&stm_class, NULL, buf, stm_dev_match);
> +	dev = class_find_device_by_name(&stm_class, buf);
>  	if (!dev)
>  		return NULL;
>  
> diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
> index 4793e77808e2..d54c8e4d8954 100644
> --- a/drivers/leds/led-class.c
> +++ b/drivers/leds/led-class.c
> @@ -213,13 +213,6 @@ static int led_resume(struct device *dev)
>  
>  static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume);
>  
> -static int match_name(struct device *dev, const void *data)
> -{
> -	if (!dev_name(dev))
> -		return 0;
> -	return !strcmp(dev_name(dev), (char *)data);
> -}
> -
>  static int led_classdev_next_name(const char *init_name, char *name,
>  				  size_t len)
>  {
> @@ -230,7 +223,7 @@ static int led_classdev_next_name(const char *init_name, char *name,
>  	strlcpy(name, init_name, len);
>  
>  	while ((ret < len) &&
> -	       (dev = class_find_device(leds_class, NULL, name, match_name))) {
> +	       (dev = class_find_device_by_name(leds_class, name))) {
>  		put_device(dev);
>  		ret = snprintf(name, len, "%s_%u", init_name, ++i);
>  	}
> diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
> index 72b7ddc43116..c93ef33b01d3 100644
> --- a/drivers/rtc/interface.c
> +++ b/drivers/rtc/interface.c
> @@ -663,21 +663,12 @@ void rtc_update_irq(struct rtc_device *rtc,
>  }
>  EXPORT_SYMBOL_GPL(rtc_update_irq);
>  
> -static int __rtc_match(struct device *dev, const void *data)
> -{
> -	const char *name = data;
> -
> -	if (strcmp(dev_name(dev), name) == 0)
> -		return 1;
> -	return 0;
> -}
> -
>  struct rtc_device *rtc_class_open(const char *name)
>  {
>  	struct device *dev;
>  	struct rtc_device *rtc = NULL;
>  
> -	dev = class_find_device(rtc_class, NULL, name, __rtc_match);
> +	dev = class_find_device_by_name(rtc_class, name);
>  	if (dev)
>  		rtc = to_rtc_device(dev);
>  
> diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
> index c522e9313c50..d843e362c167 100644
> --- a/drivers/s390/cio/ccwgroup.c
> +++ b/drivers/s390/cio/ccwgroup.c
> @@ -608,13 +608,6 @@ void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver)
>  }
>  EXPORT_SYMBOL(ccwgroup_driver_unregister);
>  
> -static int __ccwgroupdev_check_busid(struct device *dev, const void *id)
> -{
> -	const char *bus_id = id;
> -
> -	return (strcmp(bus_id, dev_name(dev)) == 0);
> -}
> -
>  /**
>   * get_ccwgroupdev_by_busid() - obtain device from a bus id
>   * @gdrv: driver the device is owned by
> @@ -631,8 +624,7 @@ struct ccwgroup_device *get_ccwgroupdev_by_busid(struct ccwgroup_driver *gdrv,
>  {
>  	struct device *dev;
>  
> -	dev = driver_find_device(&gdrv->driver, NULL, bus_id,
> -				 __ccwgroupdev_check_busid);
> +	dev = driver_find_device_by_name(&gdrv->driver, bus_id);
>  
>  	return dev ? to_ccwgroupdev(dev) : NULL;
>  }
> diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
> index c421899be20f..131430bd48d9 100644
> --- a/drivers/s390/cio/device.c
> +++ b/drivers/s390/cio/device.c
> @@ -1695,18 +1695,6 @@ int ccw_device_force_console(struct ccw_device *cdev)
>  EXPORT_SYMBOL_GPL(ccw_device_force_console);
>  #endif
>  
> -/*
> - * get ccw_device matching the busid, but only if owned by cdrv
> - */
> -static int
> -__ccwdev_check_busid(struct device *dev, const void *id)
> -{
> -	const char *bus_id = id;
> -
> -	return (strcmp(bus_id, dev_name(dev)) == 0);
> -}
> -
> -
>  /**
>   * get_ccwdev_by_busid() - obtain device from a bus id
>   * @cdrv: driver the device is owned by
> @@ -1723,8 +1711,7 @@ struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
>  {
>  	struct device *dev;
>  
> -	dev = driver_find_device(&cdrv->driver, NULL, (void *)bus_id,
> -				 __ccwdev_check_busid);
> +	dev = driver_find_device_by_name(&cdrv->driver, bus_id);
>  
>  	return dev ? to_ccwdev(dev) : NULL;
>  }
> diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
> index 1058b4b5cc1e..38a5a47b8c9c 100644
> --- a/drivers/s390/crypto/zcrypt_api.c
> +++ b/drivers/s390/crypto/zcrypt_api.c
> @@ -133,12 +133,6 @@ struct zcdn_device {
>  static int zcdn_create(const char *name);
>  static int zcdn_destroy(const char *name);
>  
> -/* helper function, matches the name for find_zcdndev_by_name() */
> -static int __match_zcdn_name(struct device *dev, const void *data)
> -{
> -	return strcmp(dev_name(dev), (const char *)data) == 0;
> -}
> -
>  /* helper function, matches the devt value for find_zcdndev_by_devt() */
>  static int __match_zcdn_devt(struct device *dev, const void *data)
>  {
> @@ -152,10 +146,7 @@ static int __match_zcdn_devt(struct device *dev, const void *data)
>   */
>  static inline struct zcdn_device *find_zcdndev_by_name(const char *name)
>  {
> -	struct device *dev =
> -		class_find_device(zcrypt_class, NULL,
> -				  (void *) name,
> -				  __match_zcdn_name);
> +	struct device *dev = class_find_device_by_name(zcrypt_class, name);
>  
>  	return dev ? to_zcdn_dev(dev) : NULL;
>  }
> diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
> index 86defca6623e..c8efe60e2465 100644
> --- a/drivers/usb/roles/class.c
> +++ b/drivers/usb/roles/class.c
> @@ -90,11 +90,6 @@ static int switch_fwnode_match(struct device *dev, const void *fwnode)
>  	return dev_fwnode(dev) == fwnode;
>  }
>  
> -static int switch_name_match(struct device *dev, const void *name)
> -{
> -	return !strcmp((const char *)name, dev_name(dev));
> -}
> -
>  static void *usb_role_switch_match(struct device_connection *con, int ep,
>  				   void *data)
>  {
> @@ -107,8 +102,7 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
>  		dev = class_find_device(role_class, NULL, con->fwnode,
>  					switch_fwnode_match);
>  	} else {
> -		dev = class_find_device(role_class, NULL, con->endpoint[ep],
> -					switch_name_match);
> +		dev = class_find_device_by_name(role_class, con->endpoint[ep]);
>  	}
>  
>  	return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index a18285a990a8..9b0d15b487e5 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -210,11 +210,6 @@ static int typec_port_fwnode_match(struct device *dev, const void *fwnode)
>  	return dev_fwnode(dev) == fwnode;
>  }
>  
> -static int typec_port_name_match(struct device *dev, const void *name)
> -{
> -	return !strcmp((const char *)name, dev_name(dev));
> -}
> -
>  static void *typec_port_match(struct device_connection *con, int ep, void *data)
>  {
>  	struct device *dev;
> @@ -227,8 +222,7 @@ static void *typec_port_match(struct device_connection *con, int ep, void *data)
>  		return class_find_device(typec_class, NULL, con->fwnode,
>  					 typec_port_fwnode_match);
>  
> -	dev = class_find_device(typec_class, NULL, con->endpoint[ep],
> -				typec_port_name_match);
> +	dev = class_find_device_by_name(typec_class, con->endpoint[ep]);
>  
>  	return dev ? dev : ERR_PTR(-EPROBE_DEFER);
>  }
> diff --git a/include/linux/device.h b/include/linux/device.h
> index c330b75c6c57..3ba376b8b456 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -164,6 +164,7 @@ void subsys_dev_iter_init(struct subsys_dev_iter *iter,
>  struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
>  void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
>  
> +int device_match_name(struct device *dev, const void *name);
>  int device_match_of_node(struct device *dev, const void *np);
>  
>  int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
> @@ -171,9 +172,20 @@ int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
>  struct device *bus_find_device(struct bus_type *bus, struct device *start,
>  			       const void *data,
>  			       int (*match)(struct device *dev, const void *data));
> -struct device *bus_find_device_by_name(struct bus_type *bus,
> -				       struct device *start,
> -				       const char *name);
> +/**
> + * bus_find_device_by_name - device iterator for locating a particular device
> + * of a specific name.
> + * @bus: bus type
> + * @start: Device to begin with
> + * @name: name of the device to match
> + */
> +static inline struct device *bus_find_device_by_name(struct bus_type *bus,
> +						     struct device *start,
> +						     const char *name)
> +{
> +	return bus_find_device(bus, start, name, device_match_name);
> +}
> +
>  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,
> @@ -342,6 +354,18 @@ struct device *driver_find_device(struct device_driver *drv,
>  				  struct device *start, const void *data,
>  				  int (*match)(struct device *dev, const void *data));
>  
> +/**
> + * driver_find_device_by_name - device iterator for locating a particular device
> + * of a specific name.
> + * @driver: the driver we're iterating
> + * @name: name of the device to match
> + */
> +static inline struct device *driver_find_device_by_name(struct device_driver *drv,
> +							const char *name)
> +{
> +	return driver_find_device(drv, NULL, name, device_match_name);
> +}
> +
>  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);
> @@ -471,6 +495,18 @@ extern struct device *class_find_device(struct class *class,
>  					struct device *start, const void *data,
>  					int (*match)(struct device *, const void *));
>  
> +/**
> + * class_find_device_by_name - device iterator for locating a particular device
> + * of a specific name.
> + * @class: class type
> + * @name: name of the device to match
> + */
> +static inline struct device *class_find_device_by_name(struct class *class,
> +						       const char *name)
> +{
> +	return class_find_device(class, NULL, name, device_match_name);
> +}
> +
>  struct class_attribute {
>  	struct attribute attr;
>  	ssize_t (*show)(struct class *class, struct class_attribute *attr,
> diff --git a/net/ieee802154/core.c b/net/ieee802154/core.c
> index 60b7ac56a1f5..de259b5170ab 100644
> --- a/net/ieee802154/core.c
> +++ b/net/ieee802154/core.c
> @@ -23,11 +23,6 @@
>  LIST_HEAD(cfg802154_rdev_list);
>  int cfg802154_rdev_list_generation;
>  
> -static int wpan_phy_match(struct device *dev, const void *data)
> -{
> -	return !strcmp(dev_name(dev), (const char *)data);
> -}
> -
>  struct wpan_phy *wpan_phy_find(const char *str)
>  {
>  	struct device *dev;
> @@ -35,7 +30,7 @@ struct wpan_phy *wpan_phy_find(const char *str)
>  	if (WARN_ON(!str))
>  		return NULL;
>  
> -	dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match);
> +	dev = class_find_device_by_name(&wpan_phy_class, str);
>  	if (!dev)
>  		return NULL;
>  
> -- 
> 2.21.0

thanks,

-- 
heikki

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

Re: [PATCH v3 5/7] drivers: Introduce device lookup variants by ACPI_COMPANION device

[Andy Shevchenko]

On Fri, Jul 26, 2019 at 10:23:54PM +0200, Wolfram Sang wrote:
> On Tue, Jul 23, 2019 at 11:18:36PM +0100, Suzuki K Poulose wrote:
> > Add a generic helper to match a device by the ACPI_COMPANION device
> > and provide wrappers for the device lookup APIs.
> > 
> > Cc: Len Brown <lenb@kernel.org>
> > Cc: linux-acpi@vger.kernel.org
> > Cc: linux-spi@vger.kernel.org
> > Cc: Mark Brown <broonie@kernel.org>
> > Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
> > Cc: Wolfram Sang <wsa@the-dreams.de>
> > Cc: linux-i2c@vger.kernel.org
> > Cc: Mark Brown <broonie@kernel.org>
> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> > Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> 
> From my side, OK:
> 
> Acked-by: Wolfram Sang <wsa@the-dreams.de> # I2C parts
> 
> yet you missed to cc the I2C ACPI maintainers. Done so now.

Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Thanks, Wolfram, for notifying.

> 
> > ---
> >  drivers/base/core.c         |  6 ++++
> >  drivers/i2c/i2c-core-acpi.c | 11 ++-----
> >  drivers/spi/spi.c           |  8 +----
> >  include/linux/device.h      | 65 +++++++++++++++++++++++++++++++++++++
> >  4 files changed, 74 insertions(+), 16 deletions(-)
> > 
> > diff --git a/drivers/base/core.c b/drivers/base/core.c
> > index 3abc32b60c0a..57d71bc2c559 100644
> > --- a/drivers/base/core.c
> > +++ b/drivers/base/core.c
> > @@ -3373,3 +3373,9 @@ int device_match_devt(struct device *dev, const void *pdevt)
> >  	return dev->devt == *(dev_t *)pdevt;
> >  }
> >  EXPORT_SYMBOL_GPL(device_match_devt);
> > +
> > +int device_match_acpi_dev(struct device *dev, const void *adev)
> > +{
> > +	return ACPI_COMPANION(dev) == adev;
> > +}
> > +EXPORT_SYMBOL(device_match_acpi_dev);
> > diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
> > index 4dbbc9a35f65..bc80aafb521f 100644
> > --- a/drivers/i2c/i2c-core-acpi.c
> > +++ b/drivers/i2c/i2c-core-acpi.c
> > @@ -354,17 +354,11 @@ static int i2c_acpi_find_match_adapter(struct device *dev, const void *data)
> >  	return ACPI_HANDLE(dev) == (acpi_handle)data;
> >  }
> >  
> > -static int i2c_acpi_find_match_device(struct device *dev, const void *data)
> > -{
> > -	return ACPI_COMPANION(dev) == data;
> > -}
> >  
> >  struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
> >  {
> > -	struct device *dev;
> > +	struct device *dev = bus_find_device_by_acpi_dev(&i2c_bus_type, handle);
> >  
> > -	dev = bus_find_device(&i2c_bus_type, NULL, handle,
> > -			      i2c_acpi_find_match_adapter);
> >  	return dev ? i2c_verify_adapter(dev) : NULL;
> >  }
> >  EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle);
> > @@ -373,8 +367,7 @@ static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev)
> >  {
> >  	struct device *dev;
> >  
> > -	dev = bus_find_device(&i2c_bus_type, NULL, adev,
> > -			      i2c_acpi_find_match_device);
> > +	dev = bus_find_device_by_acpi_dev(&i2c_bus_type, adev);
> >  	return dev ? i2c_verify_client(dev) : NULL;
> >  }
> >  
> > diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
> > index a591da87981a..c486a6f84c2c 100644
> > --- a/drivers/spi/spi.c
> > +++ b/drivers/spi/spi.c
> > @@ -3741,11 +3741,6 @@ static int spi_acpi_controller_match(struct device *dev, const void *data)
> >  	return ACPI_COMPANION(dev->parent) == data;
> >  }
> >  
> > -static int spi_acpi_device_match(struct device *dev, const void *data)
> > -{
> > -	return ACPI_COMPANION(dev) == data;
> > -}
> > -
> >  static struct spi_controller *acpi_spi_find_controller_by_adev(struct acpi_device *adev)
> >  {
> >  	struct device *dev;
> > @@ -3765,8 +3760,7 @@ static struct spi_device *acpi_spi_find_device_by_adev(struct acpi_device *adev)
> >  {
> >  	struct device *dev;
> >  
> > -	dev = bus_find_device(&spi_bus_type, NULL, adev, spi_acpi_device_match);
> > -
> > +	dev = bus_find_device_by_acpi_dev(&spi_bus_type, adev);
> >  	return dev ? to_spi_device(dev) : NULL;
> >  }
> >  
> > diff --git a/include/linux/device.h b/include/linux/device.h
> > index 93b2f55ef44e..7514ef3d3f1a 100644
> > --- a/include/linux/device.h
> > +++ b/include/linux/device.h
> > @@ -168,6 +168,7 @@ int device_match_name(struct device *dev, const void *name);
> >  int device_match_of_node(struct device *dev, const void *np);
> >  int device_match_fwnode(struct device *dev, const void *fwnode);
> >  int device_match_devt(struct device *dev, const void *pdevt);
> > +int device_match_acpi_dev(struct device *dev, const void *adev);
> >  
> >  int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
> >  		     int (*fn)(struct device *dev, void *data));
> > @@ -224,6 +225,28 @@ static inline struct device *bus_find_device_by_devt(struct bus_type *bus,
> >  	return bus_find_device(bus, NULL, &devt, device_match_devt);
> >  }
> >  
> > +#ifdef CONFIG_ACPI
> > +struct acpi_device;
> > +
> > +/**
> > + * bus_find_device_by_acpi_dev : device iterator for locating a particular device
> > + * matching the ACPI COMPANION device.
> > + * @bus: bus type
> > + * @adev: ACPI COMPANION device to match.
> > + */
> > +static inline struct device *
> > +bus_find_device_by_acpi_dev(struct bus_type *bus, const struct acpi_device *adev)
> > +{
> > +	return bus_find_device(bus, NULL, adev, device_match_acpi_dev);
> > +}
> > +#else
> > +static inline struct device *
> > +bus_find_device_by_acpi_dev(struct bus_type *bus, const void *adev)
> > +{
> > +	return NULL;
> > +}
> > +#endif
> > +
> >  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,
> > @@ -442,6 +465,27 @@ static inline struct device *driver_find_device_by_devt(struct device_driver *dr
> >  	return driver_find_device(drv, NULL, &devt, device_match_devt);
> >  }
> >  
> > +#ifdef CONFIG_ACPI
> > +/**
> > + * driver_find_device_by_acpi_dev : device iterator for locating a particular
> > + * device matching the ACPI_COMPANION device.
> > + * @driver: the driver we're iterating
> > + * @adev: ACPI_COMPANION device to match.
> > + */
> > +static inline struct device *
> > +driver_find_device_by_acpi_dev(struct device_driver *drv,
> > +			       const struct acpi_device *adev)
> > +{
> > +	return driver_find_device(drv, NULL, adev, device_match_acpi_dev);
> > +}
> > +#else
> > +static inline struct device *
> > +driver_find_device_by_acpi_dev(struct device_driver *drv, const void *adev)
> > +{
> > +	return NULL;
> > +}
> > +#endif
> > +
> >  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);
> > @@ -620,6 +664,27 @@ static inline struct device *class_find_device_by_devt(struct class *class,
> >  	return class_find_device(class, NULL, &devt, device_match_devt);
> >  }
> >  
> > +#ifdef CONFIG_ACPI
> > +struct acpi_device;
> > +/**
> > + * class_find_device_by_acpi_dev : device iterator for locating a particular
> > + * device matching the ACPI_COMPANION device.
> > + * @class: class type
> > + * @adev: ACPI_COMPANION device to match.
> > + */
> > +static inline struct device *
> > +class_find_device_by_acpi_dev(struct class *class, const struct acpi_device *adev)
> > +{
> > +	return class_find_device(class, NULL, adev, device_match_acpi_dev);
> > +}
> > +#else
> > +static inline struct device *
> > +class_find_device_by_acpi_dev(struct class *class, const void *adev)
> > +{
> > +	return NULL;
> > +}
> > +#endif
> > +
> >  struct class_attribute {
> >  	struct attribute attr;
> >  	ssize_t (*show)(struct class *class, struct class_attribute *attr,
> > -- 
> > 2.21.0
> > 



-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 5/7] drivers: Introduce device lookup variants by ACPI_COMPANION device

[Wolfram Sang]

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On Thu, Aug 01, 2019 at 02:58:56PM +0300, Andy Shevchenko wrote:
> On Fri, Jul 26, 2019 at 10:23:54PM +0200, Wolfram Sang wrote:
> > On Tue, Jul 23, 2019 at 11:18:36PM +0100, Suzuki K Poulose wrote:
> > > Add a generic helper to match a device by the ACPI_COMPANION device
> > > and provide wrappers for the device lookup APIs.
> > > 
> > > Cc: Len Brown <lenb@kernel.org>
> > > Cc: linux-acpi@vger.kernel.org
> > > Cc: linux-spi@vger.kernel.org
> > > Cc: Mark Brown <broonie@kernel.org>
> > > Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
> > > Cc: Wolfram Sang <wsa@the-dreams.de>
> > > Cc: linux-i2c@vger.kernel.org
> > > Cc: Mark Brown <broonie@kernel.org>
> > > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > > Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> > > Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> > 
> > From my side, OK:
> > 
> > Acked-by: Wolfram Sang <wsa@the-dreams.de> # I2C parts
> > 
> > yet you missed to cc the I2C ACPI maintainers. Done so now.
> 
> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> 
> Thanks, Wolfram, for notifying.

Sure. There seems to be a problem, though? Please check:

[PATCH 1/3] i2c: Revert incorrect conversion to use generic helper

which came in today.


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Re: [PATCH v3 5/7] drivers: Introduce device lookup variants by ACPI_COMPANION device

[Andy Shevchenko]

On Thu, Aug 01, 2019 at 02:08:30PM +0200, Wolfram Sang wrote:
> On Thu, Aug 01, 2019 at 02:58:56PM +0300, Andy Shevchenko wrote:
> > On Fri, Jul 26, 2019 at 10:23:54PM +0200, Wolfram Sang wrote:
> > > On Tue, Jul 23, 2019 at 11:18:36PM +0100, Suzuki K Poulose wrote:
> > > > Add a generic helper to match a device by the ACPI_COMPANION device
> > > > and provide wrappers for the device lookup APIs.
> > > > 
> > > > Cc: Len Brown <lenb@kernel.org>
> > > > Cc: linux-acpi@vger.kernel.org
> > > > Cc: linux-spi@vger.kernel.org
> > > > Cc: Mark Brown <broonie@kernel.org>
> > > > Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
> > > > Cc: Wolfram Sang <wsa@the-dreams.de>
> > > > Cc: linux-i2c@vger.kernel.org
> > > > Cc: Mark Brown <broonie@kernel.org>
> > > > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > > > Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> > > > Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> > > 
> > > From my side, OK:
> > > 
> > > Acked-by: Wolfram Sang <wsa@the-dreams.de> # I2C parts
> > > 
> > > yet you missed to cc the I2C ACPI maintainers. Done so now.
> > 
> > Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > 
> > Thanks, Wolfram, for notifying.
> 
> Sure. There seems to be a problem, though? Please check:
> 
> [PATCH 1/3] i2c: Revert incorrect conversion to use generic helper
> 
> which came in today.

It's again not Cc'ed to all parties.
But OK, looks good to me.
Tough may be Jarkko can test all this.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 5/7] drivers: Introduce device lookup variants by ACPI_COMPANION device

[Wolfram Sang]

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> It's again not Cc'ed to all parties.
> But OK, looks good to me.
> Tough may be Jarkko can test all this.

To be fair, only Mika is listed as I2C ACPI maintainer. Feel free to add
more :) I assume Mika doesn't mind.


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