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

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Date:   Tue, 18 Oct 2022 14:28:40 +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 14, 2022 at 4:24 AM Nícolas F. R. A. Prado
<nfraprado@...labora.com> wrote:
>
> On Fri, Oct 07, 2022 at 12:02:03PM +0800, Chen-Yu Tsai wrote:
> > 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.
>
> Ok, will drop the extra ones.
>
> > >
> > > Also, I think we can disable i2c6. None of the current products use it.
>
> It's already disabled upstream.
>
> > >
> > > 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.
>
> Based on the downstream dts, rev0 and rev1 do have SD card slot (or at least the
> mmc1 controller isn't disabled on those). However upstream we have a single dts
> (asurada-spherion-r0) shared by those two and rev2 and rev3 (which don't have
> the SD card slot), given that this way we can have a single dts and there's no
> disadvantage to keeping the mmc1 node enabled because the CD IRQ will never be
> triggered. With this in mind, I think it makes more sense to keep the mmc
> aliases in the asurada dtsi, as there's no harm in having them, and will ensure
> fixed ids for the rev0 and rev1 spherion boards.

Sounds good to me.

ChenYu