linux-kernel - Re: [PATCH 2/2] ARM: tegra: initial add of Colibri T30

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Message-ID: <20140514143209.GB8612@ulmo>
Date:	Wed, 14 May 2014 16:32:11 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Marcel Ziswiler <marcel@...wiler.com>
Cc:	Stephen Warren <swarren@...dotorg.org>, stefan@...er.ch,
	linux@....linux.org.uk, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH 2/2] ARM: tegra: initial add of Colibri T30

On Wed, May 14, 2014 at 09:22:54AM +0200, Marcel Ziswiler wrote:
> On 05/13/2014 09:49 PM, Stephen Warren wrote:
> >On 05/13/2014 11:27 AM, stefan@...er.ch wrote:
[...]
> >>+	panel: panel {
> >>+		compatible = "edt,et057090dhu", "simple-panel";
> >
> >The panel-simple driver doesn't seem to know about that EDT panel. How
> >will it work out the display timings?
> 
> Good question and me and Stefan actually even talked about that yesterday. I
> am actually using KMS right now as follows:
> 
> video=HDMI-A-1:1280x720-16@60 video=LVDS-1:640x480-16@60'
> 
> So the panel node is purely used to hook up the back light part right now.
> 
> From our point of view for our completely generic module approach where each
> customer potentially hooks up his own display make/model it would be
> desirable to have some way of defining such timings directly through the
> device tree.

Every customer design would presumably get its own device tree file, so
they could easily follow the current conventions and update the
panel-simple driver with the proper compatible value and display timings
and then simply make the panel device node compatible with that.

Thierry

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