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of: introduce helper to manage boolean

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of_property_read_bool

Search for a property in a device node.
Returns true if the property exist false otherwise.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2012-02-07 12:12:51 +08:00
parent 98619dcb77
commit fa4d34ccd0
1 changed files with 16 additions and 0 deletions
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16
include/linux/of.h
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@ -342,6 +342,22 @@ static inline int of_machine_is_compatible(const char *compat)
#define of_match_node(_matches, _node) NULL
#endif /* CONFIG_OF */
/**
* of_property_read_bool - Findfrom a property
* @np: device node from which the property value is to be read.
* @propname: name of the property to be searched.
*
* Search for a property in a device node.
* Returns true if the property exist false otherwise.
*/
static inline bool of_property_read_bool(const struct device_node *np,
const char *propname)
{
struct property *prop = of_find_property(np, propname, NULL);
return prop ? true : false;
}
static inline int of_property_read_u32(const struct device_node *np,
const char *propname,
u32 *out_value)