device property: Add fwnode_property_match_property_string()

Sometimes the users want to match the single value string property
against an array of predefined strings. Create a helper for them.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/20230808162800.61651-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 3bb9505f1631a4..8f8e2a6816bc00 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -499,6 +499,41 @@ out_free:
 EXPORT_SYMBOL_GPL(fwnode_property_match_string);
 
 /**
+ * fwnode_property_match_property_string - find a property string value in an array and return index
+ * @fwnode: Firmware node to get the property of
+ * @propname: Name of the property holding the string value
+ * @array: String array to search in
+ * @n: Size of the @array
+ *
+ * Find a property string value in a given @array and if it is found return
+ * the index back.
+ *
+ * Return: index, starting from %0, if the string value was found in the @array (success),
+ *	   %-ENOENT when the string value was not found in the @array,
+ *	   %-EINVAL if given arguments are not valid,
+ *	   %-ENODATA if the property does not have a value,
+ *	   %-EPROTO or %-EILSEQ if the property is not a string,
+ *	   %-ENXIO if no suitable firmware interface is present.
+ */
+int fwnode_property_match_property_string(const struct fwnode_handle *fwnode,
+	const char *propname, const char * const *array, size_t n)
+{
+	const char *string;
+	int ret;
+
+	ret = fwnode_property_read_string(fwnode, propname, &string);
+	if (ret)
+		return ret;
+
+	ret = match_string(array, n, string);
+	if (ret < 0)
+		ret = -ENOENT;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(fwnode_property_match_property_string);
+
+/**
  * fwnode_property_get_reference_args() - Find a reference with arguments
  * @fwnode:	Firmware node where to look for the reference
  * @prop:	The name of the property