[RFC] drm: add overlays as first class KMS objects

[Alan Cox]

> I think 4cc it bit useless with RGB stuff (or maybe i just don't
> understand 4cc). For instance i think we want uniq different id for
> RGB555, RGB565,RGBX8888, RGBA8888, BGRA8888 ... it seems 4cc just says
> rgb and than rely on additional informations for color order or
> components size.

Yes - grep "fourcc" include/linux/videodev2.h

plus see the docs - I think its sufficient for pretty much all of it we
would end up needing except maybe a few texture formats like S3TC (which
are of course 4CC codes too)

Alan