UIF_PAD_SINK
prev->sink_pad = UIF_PAD_SINK;
format.pad = UIF_PAD_SINK;
if (sel->pad != UIF_PAD_SINK ||
format = v4l2_subdev_state_get_format(state, UIF_PAD_SINK);
crop = v4l2_subdev_state_get_crop(state, UIF_PAD_SINK);
if (sel->pad != UIF_PAD_SINK)
format = v4l2_subdev_state_get_format(state, UIF_PAD_SINK);