linux-kernel - Re: [PATCH 3/5] arm64: dts: mt8192: Add display nodes

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Message-ID: <CAGXv+5EKK_eicvD6-nFG0CkirYA2sFUJp59m6RK7y534HvYwbg@mail.gmail.com>
Date:   Fri, 1 Jul 2022 13:25:01 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
Cc:     "allen-kh.cheng" <allen-kh.cheng@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 3/5] arm64: dts: mt8192: Add display nodes

On Thu, Jun 30, 2022 at 9:42 PM Nícolas F. R. A. Prado
<nfraprado@...labora.com> wrote:
>
> On Thu, Jun 30, 2022 at 05:41:31PM +0800, allen-kh.cheng wrote:
> > Hi Nícolas,
> >
> > On Wed, 2022-06-29 at 19:24 -0400, Nícolas F. R. A. Prado wrote:
> > > On Wed, Jun 29, 2022 at 08:13:56PM +0800, Allen-KH Cheng wrote:
> > > > Add display nodes and gce info for mt8192 SoC.
> > > >
> > > > GCE (Global Command Engine) properties to the display nodes in
> > > > order to
> > > > enable the usage of the CMDQ (Command Queue), which is required for
> > > > operating the display.
> > > >
> > > > Signed-off-by: Allen-KH Cheng <allen-kh.cheng@...iatek.com>
> > > > Reviewed-by: AngeloGioacchino Del Regno <
> > > > angelogioacchino.delregno@...labora.com>
> > > > ---
> > > >  arch/arm64/boot/dts/mediatek/mt8192.dtsi | 136
> > > > +++++++++++++++++++++++
> > > >  1 file changed, 136 insertions(+)
> > > >
> > > > diff --git a/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> > > > b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> > > > index a07edc82d403..26d01544b4ea 100644
> > > > --- a/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> > > > +++ b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> [..]
> > > > +         rdma0: rdma@...07000 {
> > > > +                 compatible = "mediatek,mt8192-disp-rdma";
> > >
> > > dtbs_check is complaining that there isn't a "mediatek,mt8183-disp-
> > > rdma"
> > > fallback compatible here. But given that the rdma driver matches
> > > directly to the
> > > mt8192 compatible, I think the node here is fine, and the binding is
> > > the one
> > > that should be updated.
> > >
> >
> > I have checked the binding and driver again.
> >
> > I prefer use "mediatek,mt8186-disp-rdma" as fallback and remove mt8192
> > compatible and data in mtk_disp_rdma.c because they are the same with
> > mt8183.
> >
> > Do you think it is okay?
>
> Sure, that sounds good to me as well.

That's backwards. MT8192 was released well before MT8186. The latter hasn't
even hit the market yet.

Please use "mediatek,mt8183-disp-rdma" as fallback. And you need to keep
"mediatek,mt8192-disp-rdma" as the most specific compatible string, because
we want SoC specific compatible strings.

For the driver, there isn't any difference between mt8183 and mt8192 for
the rdma part, so we might as well just remove the mt8192 compatible from
the driver.


Regards
ChenYu