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

[Alan Cox]

> having a list per hardware. uint32_t would give enough room to add all
> formats even if one format is only supported by one hardware only (at

It would indeed. A point realised by the Amiga designers in 1985 and
turned into a standard of sorts with a registry and process and adopted
by folks like Apple and Microsoft.

See www.fourcc.org. 4CC is already used by the kernel for Video4Linux.