Commit 3395de96 authored by Marcin Wojtas's avatar Marcin Wojtas Committed by David S. Miller
Browse files

device property: Allow iterating over available child fwnodes 



Implement a new helper function fwnode_get_next_available_child_node(),
which enables obtaining next enabled child fwnode, which
works on a similar basis to OF's of_get_next_available_child().

This commit also introduces a macro, thanks to which it is
possible to iterate over the available fwnodes, using the
new function described above.

Signed-off-by: default avatarMarcin Wojtas <mw@semihalf.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7c6c57f2

drivers/base/property.c

+26 −0
Original line number Diff line number Diff line
@@ -997,6 +997,32 @@ fwnode_get_next_child_node(const struct fwnode_handle *fwnode, 
}

EXPORT_SYMBOL_GPL(fwnode_get_next_child_node);



/**

 * fwnode_get_next_available_child_node - Return the next

 * available child node handle for a node

 * @fwnode: Firmware node to find the next child node for.

 * @child: Handle to one of the node's child nodes or a %NULL handle.

 */

struct fwnode_handle *

fwnode_get_next_available_child_node(const struct fwnode_handle *fwnode,

				     struct fwnode_handle *child)

{

	struct fwnode_handle *next_child = child;



	if (!fwnode)

		return NULL;



	do {

		next_child = fwnode_get_next_child_node(fwnode, next_child);



		if (!next_child || fwnode_device_is_available(next_child))

			break;

	} while (next_child);



	return next_child;

}

EXPORT_SYMBOL_GPL(fwnode_get_next_available_child_node);



/**

 * device_get_next_child_node - Return the next child node handle for a device

 * @dev: Device to find the next child node for.

include/linux/property.h

+6 −0
Original line number Diff line number Diff line
@@ -83,11 +83,17 @@ struct fwnode_handle *fwnode_get_next_parent( 
	struct fwnode_handle *fwnode);

struct fwnode_handle *fwnode_get_next_child_node(

	const struct fwnode_handle *fwnode, struct fwnode_handle *child);

struct fwnode_handle *fwnode_get_next_available_child_node(

	const struct fwnode_handle *fwnode, struct fwnode_handle *child);



#define fwnode_for_each_child_node(fwnode, child)			\

	for (child = fwnode_get_next_child_node(fwnode, NULL); child;	\

	     child = fwnode_get_next_child_node(fwnode, child))



#define fwnode_for_each_available_child_node(fwnode, child)		       \

	for (child = fwnode_get_next_available_child_node(fwnode, NULL); child;\

	     child = fwnode_get_next_available_child_node(fwnode, child))



struct fwnode_handle *device_get_next_child_node(

	struct device *dev, struct fwnode_handle *child);

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