diff options
| author |   Grant Likely <grant.likely@secretlab.ca> | 2009-04-25 12:52:40 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2009-04-27 02:53:45 -0700 |
| commit | 739649c53d7f78f5bf41bdfd1a858ee90c7a687a (patch) | |
| tree | 0e11496435be0cab44c7eaab37964a7c74bd3187 /drivers/of | |
| parent | snmp: add missing counters for RFC 4293 (diff) | |
| download | linux-dev-739649c53d7f78f5bf41bdfd1a858ee90c7a687a.tar.xz linux-dev-739649c53d7f78f5bf41bdfd1a858ee90c7a687a.zip | |
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>
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/base.c | 24 |
1 files changed, 24 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) 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 * @list_name: property name that contains a list |