linux-kernel - Re: [PATCH] dt-bindings: display: mediatek: dp: Add compatible for MediaTek MT8188

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Message-ID: <20220926215440.GA2888681-robh@kernel.org>
Date:   Mon, 26 Sep 2022 16:54:40 -0500
From:   Rob Herring <robh@...nel.org>
To:     "liangxu.xu" <liangxu.xu@...iatek.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        chunkuang.hu@...nel.org, p.zabel@...gutronix.de, airlied@...ux.ie,
        daniel@...ll.ch, krzysztof.kozlowski+dt@...aro.org,
        matthias.bgg@...il.com, jitao.shi@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] dt-bindings: display: mediatek: dp: Add compatible for
 MediaTek MT8188

On Mon, Sep 26, 2022 at 10:52:04AM +0800, liangxu.xu wrote:
> On Fri, 2022-09-23 at 13:16 +0200, Krzysztof Kozlowski wrote:
> > On 23/09/2022 03:39, liangxu.xu@...iatek.com wrote:
> > > From: liangxu xu <liangxu.xu@...iatek.com>
> > > 
> > > Add dt-binding documentation of dp for MediaTek MT8188 SoC.
> > > 
> > > Signed-off-by: liangxu xu <liangxu.xu@...iatek.com>
> > > ---
> > 
> > Where is the DTS? Where are driver changes?
> > 
> > Best regards,
> > Krzysztof
> > 
> 
> Hi Krzysztof:
> 
> If you want to see the synchronous changes of dts and binding files,
> then I will attach this binding file changes when sending dts later.
> 
> The driver change of mt8188 reuses that of mt8195. The driver link is
> as follows:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/gpu/drm/mediatek/mtk_dp.c?id=48f4230642ee32a97ddf4be492838ce96089f040

So the 8188 block is backwards compatible with the 8195 block? 
That's good, but not what your schema says because you have not defined 
a fallback compatible for the driver to use.

Rob