of: Add of_property_present() helper

Add an of_property_present() function similar to
fwnode_property_present(). of_property_read_bool() could be used
directly, but it is cleaner to not use it on non-boolean properties.

Reviewed-by: Frank Rowand <frowand.list@gmail.com>
Tested-by: Frank Rowand <frowand.list@gmail.com>
Link: https://lore.kernel.org/all/20230215215547.691573-1-robh@kernel.org/
Signed-off-by: Rob Herring <robh@kernel.org>

diff --git a/include/linux/of.h b/include/linux/of.h
index 8bb348666709b16fd761f35ae2c1481d061ff53a..37afd04f36eb4d6f326f87af88b2360ae674d170 100644 (file)
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -1155,7 +1155,8 @@ static inline int of_property_read_string_index(const struct device_node *np,
  * @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.
+ * Search for a boolean property in a device node. Usage on non-boolean
+ * property types is deprecated.
  *
  * Return: true if the property exists false otherwise.
  */
@@ -1167,6 +1168,20 @@ static inline bool of_property_read_bool(const struct device_node *np,
        return prop ? true : false;
 }
 
+/**
+ * of_property_present - Test if a property is present in a node
+ * @np:                device node to search for the property.
+ * @propname:  name of the property to be searched.
+ *
+ * Test for a property present in a device node.
+ *
+ * Return: true if the property exists false otherwise.
+ */
+static inline bool of_property_present(const struct device_node *np, const char *propname)
+{
+       return of_property_read_bool(np, propname);
+}
+
 /**
  * of_property_read_u8_array - Find and read an array of u8 from a property.
  *