linux-kernel - Re: [PATCH v2 5/5] arm64: dts: mediatek: asurada: Add aliases for i2c and mmc

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Date:   Fri, 7 Oct 2022 12:02:03 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>, kernel@...labora.com,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 5/5] arm64: dts: mediatek: asurada: Add aliases for i2c
 and mmc

On Fri, Oct 7, 2022 at 11:51 AM Chen-Yu Tsai <wenst@...omium.org> wrote:
>
> On Fri, Oct 7, 2022 at 5:25 AM Nícolas F. R. A. Prado
> <nfraprado@...labora.com> wrote:
> >
> > Add aliases for the i2c and mmc nodes on the Asurada platform DT to
> > ensure that we get stable ids for those devices on userspace.
> >
> > Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> >
> > ---
> >
> > Changes in v2:
> > - Added this commit
> >
> >  arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
> > index dac2d4f5e670..758ca42a6156 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
> > +++ b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
> > @@ -11,6 +11,18 @@
> >
> >  / {
> >         aliases {
> > +               i2c0 = &i2c0;
> > +               i2c1 = &i2c1;
> > +               i2c2 = &i2c2;
> > +               i2c3 = &i2c3;
> > +               i2c4 = &i2c4;
> > +               i2c5 = &i2c5;
> > +               i2c6 = &i2c6;
> > +               i2c7 = &i2c7;
> > +               i2c8 = &i2c8;
> > +               i2c9 = &i2c9;
>
> You should only add aliases for interfaces that are actually enabled.
>
> Also, I think we can disable i2c6. None of the current products use it.
>
> ChenYu
>
> > +               mmc0 = &mmc0;
> > +               mmc1 = &mmc1;

Also, Spherion does not have an SD card slot. It might be better to move
the mmc aliases to the end .dts files.

ChenYu