linux-kernel - [RFC PATCH 46/57] driver: Add variants of driver_find

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Date:   Mon,  3 Jun 2019 16:50:12 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-kernel@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, rafael@...nel.org,
        suzuki.poulose@....com
Subject: [RFC PATCH 46/57] driver: Add variants of driver_find_device()

Add a wrappers to lookup a device by name for a given driver, by various
generic properties of a device. This can avoid the proliferation of custom
match functions throughout the drivers.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 include/linux/device.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index 52d59d5..68d6e04 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -401,6 +401,50 @@ struct device *driver_find_device(struct device_driver *drv,
 				  struct device *start, 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
+ * @start: Device to begin with
+ * @name: name of the device to match
+ */
+static inline struct device *driver_find_device_by_name(struct device_driver *drv,
+							struct device *start,
+							const char *name)
+{
+	return driver_find_device(drv, start, (void *)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
+ * @start: Device to begin with
+ * @np: of_node pointer to match.
+ */
+static inline struct device *
+driver_find_device_by_of_node(struct device_driver *drv,
+			      struct device *start,
+			      const struct device_node *np)
+{
+	return driver_find_device(drv, start, (void *)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
+ * @start: Device to begin with
+ * @fwnode: fwnode pointer to match.
+ */
+static inline struct device *
+driver_find_device_by_fwnode(struct device_driver *drv,
+			     struct device *start,
+			     const struct fwnode_handle *fwnode)
+{
+	return driver_find_device(drv, start, (void *)fwnode, device_match_fwnode);
+}
+
 void driver_deferred_probe_add(struct device *dev);
 int driver_deferred_probe_check_state(struct device *dev);
 
-- 
2.7.4