linux-kernel - Re: [PATCH V10 8/8] arm64: dts: sc7280: Add aliases for I2C and SPI

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Date:   Tue, 19 Oct 2021 13:59:03 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Arnd Bergmann <arnd@...nel.org>,
        Rajesh Patil <rajpat@...eaurora.org>
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        msavaliy@....qualcomm.com, satya priya <skakit@...eaurora.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Doug Anderson <dianders@...omium.org>
Subject: Re: [PATCH V10 8/8] arm64: dts: sc7280: Add aliases for I2C and SPI

On Tue 19 Oct 13:43 PDT 2021, Arnd Bergmann wrote:

> On Thu, Sep 23, 2021 at 2:18 PM Rajesh Patil <rajpat@...eaurora.org> wrote:
> >
> > Add aliases for i2c and spi for sc7280 soc.
> >
> > Signed-off-by: Rajesh Patil <rajpat@...eaurora.org>
> > Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> 
> I saw this in the pull request, can this please be reverted?
> 

Yes, this can certainly be corrected.

> Putting the aliases into the .dtsi file is really silly, as there are
> likely boards that
> don't connect every single one of those, and then will have to
> override and renumber
> them.
> 
> Please only list the aliases that are actually connected on a particular
> board.
> 
>         Arnd
> 
> > diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> > index c26647a..e5fefd1 100644
> > --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> > @@ -26,8 +26,40 @@
> >         chosen { };
> >
> >         aliases {
> > +               i2c0 = &i2c0;
> > +               i2c1 = &i2c1;
> > +               i2c2 = &i2c2;
> > +               i2c3 = &i2c3;
> > +               i2c4 = &i2c4;
> > +               i2c5 = &i2c5;
> > +               i2c6 = &i2c6;
> > +               i2c7 = &i2c7;
> > +               i2c8 = &i2c8;
> > +               i2c9 = &i2c9;
> > +               i2c10 = &i2c10;
> > +               i2c11 = &i2c11;
> > +               i2c12 = &i2c12;
> > +               i2c13 = &i2c13;
> > +               i2c14 = &i2c14;
> > +               i2c15 = &i2c15;
> >                 mmc1 = &sdhc_1;
> >                 mmc2 = &sdhc_2;
> 
> The mmc ones should probably go away as well.
> 

I should have paid more attention when applying this patch, because the
commit message should have stated why any of these were introduced.


@Rajesh, can you please help me understand the need for any of these and
prepare a patch that introduce the specific ones needed in the
individual board dts(i) files - with reasoning for the aliases in the
commit message.

Thanks,
Bjorn

> > +               spi0 = &spi0;
> > +               spi1 = &spi1;
> > +               spi2 = &spi2;
> > +               spi3 = &spi3;
> > +               spi4 = &spi4;
> > +               spi5 = &spi5;
> > +               spi6 = &spi6;
> > +               spi7 = &spi7;
> > +               spi8 = &spi8;
> > +               spi9 = &spi9;
> > +               spi10 = &spi10;
> > +               spi11 = &spi11;
> > +               spi12 = &spi12;
> > +               spi13 = &spi13;
> > +               spi14 = &spi14;
> > +               spi15 = &spi15;
> >         };
> >