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

[Boris BREZILLON <boris.brezillon@free-electrons.com>]

On Mon, 14 Jul 2014 12:18:08 +0200
Thierry Reding <thierry.reding@gmail.com> wrote:

> On Fri, Jul 11, 2014 at 02:00:25PM +0200, Boris BREZILLON wrote:
> > On Fri, 11 Jul 2014 12:37:46 +0200 Laurent Pinchart <laurent.pinchart@ideasonboard.com> wrote:
> > > On Thursday 10 July 2014 14:56:26 Boris BREZILLON wrote:
> [...]
> > > > 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