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Commit 9c19761a authored by Srinivas Kandagatla's avatar Srinivas Kandagatla Committed by Rob Herring
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dt: introduce of_get_child_by_name to get child node by name 



This patch introduces of_get_child_by_name function to get a child node
by its name in a given parent node.

Without this patch each driver code has to iterate the parent and do
a string compare, However having of_get_child_by_name libary function would
avoid code duplication, errors and is more convenient.

Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: default avatarRob Herring <rob.herring@calxeda.com>
parent ee67016f

drivers/of/base.c

+23 −0
Original line number Diff line number Diff line
@@ -363,6 +363,29 @@ struct device_node *of_get_next_child(const struct device_node *node, 
}

EXPORT_SYMBOL(of_get_next_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.

 *

 *      This function looks for child node for given matching name

 *

 *	Returns a node pointer if found, with refcount incremented, use

 *	of_node_put() on it when done.

 *	Returns NULL if node is not found.

 */

struct device_node *of_get_child_by_name(const struct device_node *node,

				const char *name)

{

	struct device_node *child;



	for_each_child_of_node(node, child)

		if (child->name && (of_node_cmp(child->name, name) == 0))

			break;

	return child;

}

EXPORT_SYMBOL(of_get_child_by_name);



/**

 *	of_find_node_by_path - Find a node matching a full OF path

 *	@path:	The full path to match

include/linux/of.h

+2 −0
Original line number Diff line number Diff line
@@ -190,6 +190,8 @@ extern struct device_node *of_get_parent(const struct device_node *node); 
extern struct device_node *of_get_next_parent(struct device_node *node);

extern struct device_node *of_get_next_child(const struct device_node *node,

					     struct device_node *prev);

extern struct device_node *of_get_child_by_name(const struct device_node *node,

					const char *name);

#define for_each_child_of_node(parent, child) \

	for (child = of_get_next_child(parent, NULL); child != NULL; \

	     child = of_get_next_child(parent, child))