Commit 8d3bbe43 authored by Biju Das's avatar Biju Das Committed by David S. Miller
Browse files

of: base: Add of_get_available_child_by_name() 



There are lot of drivers using of_get_child_by_name() followed by
of_device_is_available() to find the available child node by name for a
given parent. Provide a helper for these users to simplify the code.

Suggested-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarBiju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: default avatarSimon Horman <horms@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 26db4dbb

drivers/of/base.c

+27 −0
Original line number Diff line number Diff line
@@ -824,6 +824,33 @@ struct device_node *of_get_child_by_name(const struct device_node *node, 
}

EXPORT_SYMBOL(of_get_child_by_name);



/**

 * of_get_available_child_by_name - Find the available 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 and checks the

 * device's availability for use.

 *

 * Return: 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_available_child_by_name(const struct device_node *node,

						   const char *name)

{

	struct device_node *child;



	child = of_get_child_by_name(node, name);

	if (child && !of_device_is_available(child)) {

		of_node_put(child);

		return NULL;

	}



	return child;

}

EXPORT_SYMBOL(of_get_available_child_by_name);



struct device_node *__of_find_node_by_path(const struct device_node *parent,

						const char *path)

{

include/linux/of.h

+9 −0
Original line number Diff line number Diff line
@@ -301,6 +301,8 @@ extern struct device_node *of_get_compatible_child(const struct device_node *par 
					const char *compatible);

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

					const char *name);

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

							  const char *name);



/* cache lookup */

extern struct device_node *of_find_next_cache_node(const struct device_node *);
@@ -578,6 +580,13 @@ static inline struct device_node *of_get_child_by_name( 
	return NULL;

}



static inline struct device_node *of_get_available_child_by_name(

					const struct device_node *node,

					const char *name)

{

	return NULL;

}



static inline int of_device_is_compatible(const struct device_node *device,

					  const char *name)

{