of: port Linux of_get_compatible_child helper

Incoming Linux code port makes use of the helper. Add it now instead of
having to open-code it later.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 9ede052274..cf3bdbfe8c 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1681,6 +1681,31 @@ int of_get_available_child_count(const struct device_node *parent)
 EXPORT_SYMBOL(of_get_available_child_count);
 
 /**
+ * of_get_compatible_child - Find compatible child node
+ * @parent:	parent node
+ * @compatible:	compatible string
+ *
+ * Lookup child node whose compatible property contains the given compatible
+ * string.
+ *
+ * Returns a node pointer with refcount incremented, use of_node_put() on it
+ * when done; or NULL if not found.
+ */
+struct device_node *of_get_compatible_child(const struct device_node *parent,
+				const char *compatible)
+{
+	struct device_node *child;
+
+	for_each_child_of_node(parent, child) {
+		if (of_device_is_compatible(child, compatible))
+			return child;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(of_get_compatible_child);
+
+/**
  *	of_get_child_by_name - Find the child node by name for a given parent
  *	@node:	parent node
  *	@name:	child name to look for.