drm: add Atmel HLCDC Display Controller support
The Atmel HLCDC (HLCD Controller) IP available on some Atmel SoCs (i.e. at91sam9n12, at91sam9x5 family or sama5d3 family) provides a display controller device. This display controller supports at least one primary plane and might provide several overlays and an hardware cursor depending on the IP version. At the moment, this driver only implements an RGB connector to interface with LCD panels, but support for other kind of external devices might be added later. Signed-off-by:Boris Brezillon <boris.brezillon@free-electrons.com> Reviewed-by:
Rob Clark <robdclark@gmail.com> Tested-by:
Anthony Harivel <anthony.harivel@emtrion.de> Tested-by:
Ludovic Desroches <ludovic.desroches@atmel.com> Acked-by:
Nicolas Ferre <nicolas.ferre@atmel.com>
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