+static int video_mux_parse_endpoint(struct device *dev,
+ struct v4l2_fwnode_endpoint *vep,
+ struct v4l2_async_subdev *asd)
+{
+ /*
+ * it's not an error if remote is missing on a video-mux
+ * input port, return -ENOTCONN to skip this endpoint with
+ * no error.
+ */
+ return fwnode_device_is_available(asd->match.fwnode) ? 0 : -ENOTCONN;
+}
+
+static int video_mux_async_register(struct video_mux *vmux,
+ unsigned int num_input_pads)
+{
+ unsigned int i, *ports;
+ int ret;
+
+ ports = kcalloc(num_input_pads, sizeof(*ports), GFP_KERNEL);
+ if (!ports)
+ return -ENOMEM;
+ for (i = 0; i < num_input_pads; i++)
+ ports[i] = i;
+
+ ret = v4l2_async_register_fwnode_subdev(
+ &vmux->subdev, sizeof(struct v4l2_async_subdev),
+ ports, num_input_pads, video_mux_parse_endpoint);
+
+ kfree(ports);
+ return ret;
+}
+