of: introduce helper to manage boolean

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>

diff --git a/include/linux/of.h b/include/linux/of.h
index a75a831e2057f96e3519d100f988a584e18ac669..50059cf6313535b9a6e88fd93535f1363106d3ff 100644 (file)
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -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)