linux-kernel - [PATCH] Driver core: add bus_find_device_by_of

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Message-Id: <1537422122-6166-1-git-send-email-svellattu@mvista.com>
Date:   Thu, 20 Sep 2018 11:12:02 +0530
From:   Silesh C V <svellattu@...sta.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Silesh C V <svellattu@...sta.com>
Subject: [PATCH] Driver core: add bus_find_device_by_of_node

Similar to bus_find_device_by_name, but finds the device having a
specific of_node.

Signed-off-by: Silesh C V <svellattu@...sta.com>
---
 drivers/base/bus.c     | 21 +++++++++++++++++++++
 include/linux/device.h |  3 +++
 2 files changed, 24 insertions(+)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 8bfd27e..39f90d1 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -373,6 +373,27 @@ struct device *bus_find_device_by_name(struct bus_type *bus,
 }
 EXPORT_SYMBOL_GPL(bus_find_device_by_name);
 
+static int match_of_node(struct device *dev, void *data)
+{
+	struct device_node *node = data;
+
+	return dev->of_node == node;
+}
+
+/**
+ * bus_find_device_by_name - device iterator for locating a particular device
+ * having a specific device node
+ * @bus: bus type
+ * @start: Device to begin with
+ * @node: device node pointer
+ */
+struct device *bus_find_device_by_of_node(struct bus_type *bus,
+					struct device *start, struct device_node *node)
+{
+	return bus_find_device(bus, start, (void *)node, match_of_node);
+}
+EXPORT_SYMBOL_GPL(bus_find_device_by_of_node);
+
 /**
  * subsys_find_device_by_id - find a device with a specific enumeration number
  * @subsys: subsystem
diff --git a/include/linux/device.h b/include/linux/device.h
index 055a69d..49006fd 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -171,6 +171,9 @@ struct device *bus_find_device(struct bus_type *bus, struct device *start,
 struct device *bus_find_device_by_name(struct bus_type *bus,
 				       struct device *start,
 				       const char *name);
+struct device *bus_find_device_by_of_node(struct bus_type *bus,
+				       struct device *start,
+				       struct device_node *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,
-- 
1.9.1