+/**
+ * fwnode_property_match_string - find a string in an array and return index
+ * @fwnode: Firmware node to get the property of
+ * @propname: Name of the property holding the array
+ * @string: String to look for
+ *
+ * Find a given string in a string array and if it is found return the
+ * index back.
+ *
+ * Return: %0 if the property was found (success),
+ * %-EINVAL if given arguments are not valid,
+ * %-ENODATA if the property does not have a value,
+ * %-EPROTO if the property is not an array of strings,
+ * %-ENXIO if no suitable firmware interface is present.
+ */
+int fwnode_property_match_string(struct fwnode_handle *fwnode,
+ const char *propname, const char *string)
+{
+ const char **values;
+ int nval, ret, i;
+
+ nval = fwnode_property_read_string_array(fwnode, propname, NULL, 0);
+ if (nval < 0)
+ return nval;
+
+ values = kcalloc(nval, sizeof(*values), GFP_KERNEL);
+ if (!values)
+ return -ENOMEM;
+
+ ret = fwnode_property_read_string_array(fwnode, propname, values, nval);
+ if (ret < 0)
+ goto out;
+
+ ret = -ENODATA;
+ for (i = 0; i < nval; i++) {
+ if (!strcmp(values[i], string)) {
+ ret = i;
+ break;
+ }
+ }
+out:
+ kfree(values);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(fwnode_property_match_string);
+