linux-kernel - Re: [RFC PATCH 0/2] drm/panel: add simple-panel description using DT

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Date:	Fri, 16 May 2014 09:29:43 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	Thierry Reding <thierry.reding@...il.com>
CC:	Randy Dunlap <rdunlap@...radead.org>,
	David Airlie <airlied@...ux.ie>,
	Jean-Jacques Hiblot <jjhiblot@...phandler.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/2] drm/panel: add simple-panel description using
 DT


On 13/05/2014 09:51, Thierry Reding wrote:
> On Fri, May 09, 2014 at 04:16:40PM +0200, Boris BREZILLON wrote:
>> Hello Thierry,
>>
>> I noticed you're describing each new panel with a new entry in the
>> of_platform_match table and a new compatible string.
>> I guess you have a good reason to do it this way, because retrieving
>> panel description from DT would be pretty easy (see this series ;-)).
>>
>> Could tell me why you chose this approach ?
> The reason is that devicetree mandates that a device be identified using
> a compatible value and that compatible value should be as specific as
> possible. That compatible value should give the device driver enough
> information to know everything it needs (resolution, timings, physical
> dimension).
>
> Having all of that data in the device tree is redundant.

Okay, thanks for your answer.

As a result, you'll see a patch adding support for the FL500WVR00-A0T
(foxlink) panel soon ;-).

Best Regards,

Boris

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

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