drivers: Introduce device lookup variants by of_node

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

Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: [email protected]
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: [email protected]
Cc: Florian Fainelli <[email protected]>
Cc: Frank Rowand <[email protected]>
Cc: Heiko Stuebner <[email protected]>
Cc: Liam Girdwood <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Mathieu Poirier <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Srinivas Kandagatla <[email protected]>
Cc: Takashi Iwai <[email protected]>
Cc: Alan Tull <[email protected]>
Cc: [email protected]
Cc: Peter Rosin <[email protected]>
Cc: Florian Fainelli <[email protected]>
Cc: Heiner Kallweit <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Andrew Lunn <[email protected]>
Cc: Liam Girdwood <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Thor Thayer <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Andrew Lunn <[email protected]>
Cc: Peter Rosin <[email protected]>
Signed-off-by: Suzuki K Poulose <[email protected]>
Acked-by: Lee Jones <[email protected]>
Acked-by: Wolfram Sang <[email protected]> # I2C part
Acked-by: Moritz Fischer <[email protected]> # For FPGA part
Acked-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

1 files changed, 37 insertions, 0 deletions

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,