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Commit 739649c5 authored by Grant Likely's avatar Grant Likely Committed by David S. Miller
Browse files

of: add of_parse_phandle() helper for parsing phandle properties 



of_parse_phandle() is a helper function to read and parse a phandle
property and return a pointer to the resulting device_node.

Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Acked-by: default avatarAndy Fleming <afleming@freescale.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent edf391ff

drivers/of/base.c

+24 −0
Original line number Diff line number Diff line
@@ -494,6 +494,30 @@ int of_modalias_node(struct device_node *node, char *modalias, int len) 
}

EXPORT_SYMBOL_GPL(of_modalias_node);



/**

 * of_parse_phandle - Resolve a phandle property to a device_node pointer

 * @np: Pointer to device node holding phandle property

 * @phandle_name: Name of property holding a phandle value

 * @index: For properties holding a table of phandles, this is the index into

 *         the table

 *

 * Returns the device_node pointer with refcount incremented.  Use

 * of_node_put() on it when done.

 */

struct device_node *

of_parse_phandle(struct device_node *np, const char *phandle_name, int index)

{

	const phandle *phandle;

	int size;



	phandle = of_get_property(np, phandle_name, &size);

	if ((!phandle) || (size < sizeof(*phandle) * (index + 1)))

		return NULL;



	return of_find_node_by_phandle(phandle[index]);

}

EXPORT_SYMBOL(of_parse_phandle);



/**

 * of_parse_phandles_with_args - Find a node pointed by phandle in a list

 * @np:		pointer to a device tree node containing a list

include/linux/of.h

+3 −0
Original line number Diff line number Diff line
@@ -77,6 +77,9 @@ extern int of_n_size_cells(struct device_node *np); 
extern const struct of_device_id *of_match_node(

	const struct of_device_id *matches, const struct device_node *node);

extern int of_modalias_node(struct device_node *node, char *modalias, int len);

extern struct device_node *of_parse_phandle(struct device_node *np,

					    const char *phandle_name,

					    int index);

extern int of_parse_phandles_with_args(struct device_node *np,

	const char *list_name, const char *cells_name, int index,

	struct device_node **out_node, const void **out_args);