This can be useful to declare structures around pipes and planes and don't have to go back auditing the code if the next platorm bump that number. Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Damien Lespiau <damien.lespiau@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>