FE_CONFIG_PAD
.link_pad = FE_CONFIG_PAD
fmt = v4l2_subdev_state_get_format(state, FE_CONFIG_PAD);
case FE_CONFIG_PAD:
if (link->sink->index == FE_CONFIG_PAD)
fe->pad[FE_CONFIG_PAD].flags = MEDIA_PAD_FL_SINK;