From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Usage of internal pads creates a route internal to the subdev, and the
V4L2 camera sensor API requires such routes to be reported to userspace.
Create the route in the .init_state() operation.

Internal routing support requires stream support, so set the
V4L2_SUBDEV_FL_HAS_STREAMS flag and switch formats and selection
rectangles access from pads to streams. As the route is immutable,
there's no need to implement the .set_routing() operation, and we can
hardcode the sink and source stream IDs to 0.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 drivers/media/i2c/ov5645.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index a3353992594b..da6adb7134cf 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -971,15 +971,36 @@ static int ov5645_set_format(struct v4l2_subdev *sd,
 static int ov5645_init_state(struct v4l2_subdev *subdev,
 			     struct v4l2_subdev_state *sd_state)
 {
+	struct v4l2_subdev_route routes[1] = {
+		{
+			.sink_pad = OV5645_PAD_IMAGE,
+			.sink_stream = 0,
+			.source_pad = OV5645_PAD_SOURCE,
+			.source_stream = 0,
+			.flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE |
+				 V4L2_SUBDEV_ROUTE_FL_IMMUTABLE,
+		},
+	};
+	struct v4l2_subdev_krouting routing = {
+		.len_routes = ARRAY_SIZE(routes),
+		.num_routes = ARRAY_SIZE(routes),
+		.routes = routes,
+	};
 	struct v4l2_subdev_format fmt = {
 		.which = V4L2_SUBDEV_FORMAT_TRY,
 		.pad = OV5645_PAD_SOURCE,
+		.stream = 0,
 		.format = {
 			.code = MEDIA_BUS_FMT_UYVY8_1X16,
 			.width = ov5645_mode_info_data[1].width,
 			.height = ov5645_mode_info_data[1].height,
 		},
 	};
+	int ret;
+
+	ret = v4l2_subdev_set_routing(subdev, sd_state, &routing);
+	if (ret)
+		return ret;
 
 	ov5645_set_format(subdev, sd_state, &fmt);
 
@@ -1206,7 +1227,7 @@ static int ov5645_probe(struct i2c_client *client)
 	v4l2_i2c_subdev_init(&ov5645->sd, client, &ov5645_subdev_ops);
 	ov5645->sd.internal_ops = &ov5645_internal_ops;
 	ov5645->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
-			    V4L2_SUBDEV_FL_HAS_EVENTS;
+			    V4L2_SUBDEV_FL_HAS_EVENTS | V4L2_SUBDEV_FL_STREAMS;
 	ov5645->pads[OV5645_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
 	ov5645->pads[OV5645_PAD_IMAGE].flags = MEDIA_PAD_FL_SINK |
 					       MEDIA_PAD_FL_INTERNAL;
-- 
2.43.0