linux-kernel - Re: [PATCH] ARM: sun8i: a33: add dts for Q8 tablets with different resolution

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Message-ID: <20170822203354.la2w2fb3ljxwmjo4@flea.home>
Date:   Tue, 22 Aug 2017 22:33:54 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     icenowy@...c.io
Cc:     devicetree@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
        linux-sunxi@...glegroups.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: sun8i: a33: add dts for Q8 tablets with different
 resolution

On Mon, Aug 21, 2017 at 04:44:30PM +0800, icenowy@...c.io wrote:
> 在 2017-08-21 16:40，Maxime Ripard 写道：
> > On Thu, Aug 17, 2017 at 03:49:26PM +0800, Icenowy Zheng wrote:
> > > Q8 tablets with Allwinner A33 SoC now come with two kind of LCD,
> > > either
> > > 800x480 or 1024x600.
> > > 
> > > In order for sun4i-drm to be able to choose correct LCD configuration,
> > > two different device trees should be present, one for a resolution.
> > > 
> > > Add stub device trees for two resolutions.
> > > 
> > > As the sun4i-drm driver still has some problems to support the LCDs,
> > > the
> > > real LCD device nodes are not added to the device tree files.
> > > 
> > > Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> > 
> > This should be an overlay, ideally applied by the bootloader.
> 
> I think this is not suitable for overlay.
> 
> The two kind of Q8 tablets are not compatible at all, and they
> should both have a suitable device tree.

How are they not compatible?

Maxime

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

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