of: Add of_property_present() helper

[ Upstream commit 9cbad37ce8122de32a1529e394b468bc101c9e7f ]

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>
Stable-dep-of: c4a5118a3ae1 ("cpufreq: scmi: process the result of devm_of_clk_add_hw_provider()")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/include/linux/of.h b/include/linux/of.h
index 4403e8fc764af024f414c11220cf18206b29353c..29f657101f4f878059e916f765ae55246c4b846d 100644 (file)
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -1073,7 +1073,8 @@ 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.
  */
@@ -1085,6 +1086,20 @@ 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.
  *