Re: [RESEND PATCH v3 06/11] drm: add DT bindings documentation for atmel-hlcdc-dc driver

On Mon, 14 Jul 2014 12:18:08 +0200
Thierry Reding [off-list ref] wrote:

On Fri, Jul 11, 2014 at 02:00:25PM +0200, Boris BREZILLON wrote:

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On Fri, 11 Jul 2014 12:37:46 +0200 Laurent Pinchart [off-list ref] wrote:

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On Thursday 10 July 2014 14:56:26 Boris BREZILLON wrote:

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BTW, is there any reason for not defining an RGB connector type (I'm
currently defining HLCDC connector as an LVDS connector) ?

Not that I know of. The DRM API has been developed before display on embedded 
systems became such a hot topic. If we had to redo it today, panels might be 
exposed to userspace as such, with a connector. We have to live with the past, 
so the connector will stay, but adding a new RGB connector type could make 
sense (although we might need a different name, in a way the VGA and LVDS 
connectors also carry RGB signals).

I had the same concern: I didn't find how this kind of connectors
was named (most of the time they're just referenced as RGB) :-).
What about RAW_RGB ?

Are there even panels that take raw RGB as input? In all cases I've seen
(which admittedly may not be all that many) there's always a transparent
RGB/LVDS bridge, so the "connector" is in fact LVDS, not RGB, even if
the display controller outputs RGB directly.

At least the LCD module I'm using (FL500WVR00-A0T) is taking raw RGB as
input ;-).

Best Regards,

Boris

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com