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authorGrant Likely <grant.likely@secretlab.ca>2009-04-25 08:52:40 -0400
committerDavid S. Miller <davem@davemloft.net>2009-04-27 05:53:45 -0400
commit739649c53d7f78f5bf41bdfd1a858ee90c7a687a (patch)
tree0e11496435be0cab44c7eaab37964a7c74bd3187
parentedf391ff17232f097d72441c9ad467bcb3b5db18 (diff)
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: Grant Likely <grant.likely@secretlab.ca> Acked-by: Andy Fleming <afleming@freescale.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/of/base.c24
-rw-r--r--include/linux/of.h3
2 files changed, 27 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 41c5dfd85358..ddf224d456b2 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -495,6 +495,30 @@ int of_modalias_node(struct device_node *node, char *modalias, int len)
495EXPORT_SYMBOL_GPL(of_modalias_node); 495EXPORT_SYMBOL_GPL(of_modalias_node);
496 496
497/** 497/**
498 * of_parse_phandle - Resolve a phandle property to a device_node pointer
499 * @np: Pointer to device node holding phandle property
500 * @phandle_name: Name of property holding a phandle value
501 * @index: For properties holding a table of phandles, this is the index into
502 * the table
503 *
504 * Returns the device_node pointer with refcount incremented. Use
505 * of_node_put() on it when done.
506 */
507struct device_node *
508of_parse_phandle(struct device_node *np, const char *phandle_name, int index)
509{
510 const phandle *phandle;
511 int size;
512
513 phandle = of_get_property(np, phandle_name, &size);
514 if ((!phandle) || (size < sizeof(*phandle) * (index + 1)))
515 return NULL;
516
517 return of_find_node_by_phandle(phandle[index]);
518}
519EXPORT_SYMBOL(of_parse_phandle);
520
521/**
498 * of_parse_phandles_with_args - Find a node pointed by phandle in a list 522 * of_parse_phandles_with_args - Find a node pointed by phandle in a list
499 * @np: pointer to a device tree node containing a list 523 * @np: pointer to a device tree node containing a list
500 * @list_name: property name that contains a list 524 * @list_name: property name that contains a list
diff --git a/include/linux/of.h b/include/linux/of.h
index 6a7efa242f5e..7be2d1043c16 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -77,6 +77,9 @@ extern int of_n_size_cells(struct device_node *np);
77extern const struct of_device_id *of_match_node( 77extern const struct of_device_id *of_match_node(
78 const struct of_device_id *matches, const struct device_node *node); 78 const struct of_device_id *matches, const struct device_node *node);
79extern int of_modalias_node(struct device_node *node, char *modalias, int len); 79extern int of_modalias_node(struct device_node *node, char *modalias, int len);
80extern struct device_node *of_parse_phandle(struct device_node *np,
81 const char *phandle_name,
82 int index);
80extern int of_parse_phandles_with_args(struct device_node *np, 83extern int of_parse_phandles_with_args(struct device_node *np,
81 const char *list_name, const char *cells_name, int index, 84 const char *list_name, const char *cells_name, int index,
82 struct device_node **out_node, const void **out_args); 85 struct device_node **out_node, const void **out_args);