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Commit 3296193d authored by Timur Tabi's avatar Timur Tabi Committed by David S. Miller
Browse files

dt: introduce for_each_available_child_of_node, of_get_next_available_child 



Macro for_each_child_of_node() makes it easy to iterate over all of the
children for a given device tree node, including those nodes that are
marked as unavailable (i.e. status = "disabled").

Introduce for_each_available_child_of_node(), which is like
for_each_child_of_node(), but it automatically skips unavailable nodes.
This also requires the introduction of helper function
of_get_next_available_child(), which returns the next available child
node.

Signed-off-by: default avatarTimur Tabi <timur@freescale.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 476ad154

drivers/of/base.c

+27 −0
Original line number Original line Diff line number Diff line
@@ -363,6 +363,33 @@ struct device_node *of_get_next_child(const struct device_node *node, 
}

}

EXPORT_SYMBOL(of_get_next_child);

EXPORT_SYMBOL(of_get_next_child);





/**

 *	of_get_next_available_child - Find the next available child node

 *	@node:	parent node

 *	@prev:	previous child of the parent node, or NULL to get first

 *

 *      This function is like of_get_next_child(), except that it

 *      automatically skips any disabled nodes (i.e. status = "disabled").

 */

struct device_node *of_get_next_available_child(const struct device_node *node,

	struct device_node *prev)

{

	struct device_node *next;



	read_lock(&devtree_lock);

	next = prev ? prev->sibling : node->child;

	for (; next; next = next->sibling) {

		if (!of_device_is_available(next))

			continue;

		if (of_node_get(next))

			break;

	}

	of_node_put(prev);

	read_unlock(&devtree_lock);

	return next;

}

EXPORT_SYMBOL(of_get_next_available_child);



/**

/**

 *	of_find_node_by_path - Find a node matching a full OF path

 *	of_find_node_by_path - Find a node matching a full OF path

 *	@path:	The full path to match

 *	@path:	The full path to match

include/linux/of.h

+7 −0
Original line number Original line Diff line number Diff line
@@ -190,10 +190,17 @@ 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_parent(struct device_node *node);

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

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

					     struct device_node *prev);

					     struct device_node *prev);

extern struct device_node *of_get_next_available_child(

	const struct device_node *node, struct device_node *prev);



#define for_each_child_of_node(parent, child) \

#define for_each_child_of_node(parent, child) \

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

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

	     child = of_get_next_child(parent, child))

	     child = of_get_next_child(parent, child))





#define for_each_available_child_of_node(parent, child) \

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

	     child = of_get_next_available_child(parent, child))



static inline int of_get_child_count(const struct device_node *np)

static inline int of_get_child_count(const struct device_node *np)

{

{

	struct device_node *child;

	struct device_node *child;