@@ -831,6 +831,59 @@ static const struct v4l2_async_notifier_operations csi2_notify_ops = {
 	.unbind = csi2_notify_unbind,
 };
 
+static const struct v4l2_mbus_framefmt dwc_csi_default_fmt = {
+	.code = MEDIA_BUS_FMT_UYVY8_1X16,
+	.width = 1920,
+	.height = 1080,
+	.field = V4L2_FIELD_NONE,
+	.colorspace = V4L2_COLORSPACE_SMPTE170M,
+	.xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(V4L2_COLORSPACE_SMPTE170M),
+	.ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(V4L2_COLORSPACE_SMPTE170M),
+	.quantization = V4L2_QUANTIZATION_LIM_RANGE,
+};
+
+static int dw_csi2_subdev_set_routing(struct v4l2_subdev *sd,
+				      struct v4l2_subdev_state *state,
+				      struct v4l2_subdev_krouting *routing)
+{
+	int ret;
+
+	if (routing->num_routes > V4L2_FRAME_DESC_ENTRY_MAX)
+		return -EINVAL;
+
+	ret = v4l2_subdev_routing_validate(sd, routing,
+					   V4L2_SUBDEV_ROUTING_ONLY_1_TO_1);
+	if (ret)
+		return ret;
+
+	return v4l2_subdev_set_routing_with_fmt(sd, state, routing, &dwc_csi_default_fmt);
+}
+
+static int dw_csi2_subdev_init_state_simple(struct v4l2_subdev *sd,
+					    struct v4l2_subdev_state *sd_state)
+{
+	struct v4l2_subdev_route routes[] = {
+		{
+			.sink_pad = 0,
+			.sink_stream = 0,
+			.source_pad = 1,
+			.source_stream = 0,
+			.flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
+		},
+	};
+
+	struct v4l2_subdev_krouting routing = {
+		.num_routes = ARRAY_SIZE(routes),
+		.routes = routes,
+	};
+
+	return dw_csi2_subdev_set_routing(sd, sd_state, &routing);
+}
+
+static const struct v4l2_subdev_internal_ops dw_csi2_simple_internal_ops = {
+	.init_state = dw_csi2_subdev_init_state_simple,
+};
+
 static int csi2_async_register(struct dw_mipi_csi2_dev *csi2)
 {
 	struct v4l2_fwnode_endpoint vep = {

@@ -954,7 +1007,9 @@ int dw_mipi_csi2_init(struct platform_device *pdev, struct dw_mipi_csi2_dev *csi
 
 	csi2->sd.owner = config->module;
 	strscpy(csi2->sd.name, config->name, sizeof(csi2->sd.name));
-	csi2->sd.internal_ops = config->internal_ops;
+	csi2->sd.internal_ops = config->internal_ops ?
+					config->internal_ops :
+					&dw_csi2_simple_internal_ops;
 	csi2->sd.grp_id = config->grp_id;
 	csi2->config = config;