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

From: Thierry Reding <thierry.reding@gmail.com>
To: Boris BREZILLON <boris.brezillon@free-electrons.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	devicetree@vger.kernel.org,
	Nicolas Ferre <nicolas.ferre@atmel.com>,
	dri-devel@lists.freedesktop.org,
	Alexandre Belloni <alexandre.belloni@free-electrons.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Bo Shen <voice.shen@atmel.com>, Lee Jones <lee.jones@linaro.org>,
	Jean-Jacques Hiblot <jjhiblot@traphandler.com>,
	Samuel Ortiz <sameo@linux.intel.com>,
	Tim Niemeyer <tim.niemeyer@corscience.de>,
	Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>,
	linux-pwm@vger.kernel.org, Pawel Moll <pawel.moll@arm.com>,
	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	Rob Herring <robh+dt@kernel.org>,
	Andrew Victor <linux@maxim.org.za>,
	linux-arm-kernel@lists.infradead.org,
	Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
	Kumar Gala <galak@codeaurora.org>
Subject: Re: [RESEND PATCH v3 06/11] drm: add DT bindings documentation for atmel-hlcdc-dc driver
Date: Mon, 14 Jul 2014 12:18:08 +0200	[thread overview]
Message-ID: <20140714101807.GC9870@ulmo> (raw)
In-Reply-To: <20140711140025.62873695@bbrezillon>

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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.

Thierry

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