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

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Date:   Thu, 13 Oct 2022 16:24:38 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     Chen-Yu Tsai <wenst@...omium.org>
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 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.

Thanks,
Nícolas