diff options
author | Grant Likely <grant.likely@secretlab.ca> | 2009-04-25 08:52:40 -0400 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2009-04-27 05:53:45 -0400 |
commit | 739649c53d7f78f5bf41bdfd1a858ee90c7a687a (patch) | |
tree | 0e11496435be0cab44c7eaab37964a7c74bd3187 | |
parent | edf391ff17232f097d72441c9ad467bcb3b5db18 (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.c | 24 | ||||
-rw-r--r-- | include/linux/of.h | 3 |
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) | |||
495 | EXPORT_SYMBOL_GPL(of_modalias_node); | 495 | EXPORT_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 | */ | ||
507 | struct device_node * | ||
508 | of_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 | } | ||
519 | EXPORT_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); | |||
77 | extern const struct of_device_id *of_match_node( | 77 | extern 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); |
79 | extern int of_modalias_node(struct device_node *node, char *modalias, int len); | 79 | extern int of_modalias_node(struct device_node *node, char *modalias, int len); |
80 | extern struct device_node *of_parse_phandle(struct device_node *np, | ||
81 | const char *phandle_name, | ||
82 | int index); | ||
80 | extern int of_parse_phandles_with_args(struct device_node *np, | 83 | extern 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); |