linux-kernel - Re: [PATCH 1/2] arm64: dts: sc7180: Support Lazor/Limozeen rev9

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Date:   Thu, 28 Oct 2021 17:48:39 -0700
From:   Philip Chen <philipchen@...omium.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, dianders@...omium.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 1/2] arm64: dts: sc7180: Support Lazor/Limozeen rev9

Hi Stephen,

On Thu, Oct 28, 2021 at 4:00 PM Stephen Boyd <swboyd@...omium.org> wrote:
>
> Quoting Philip Chen (2021-10-28 15:11:31)
> > diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor.dtsi
> > index 8b79fbb75756..69666f92176a 100644
> > --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor.dtsi
> > @@ -5,13 +5,10 @@
> >   * Copyright 2020 Google LLC.
> >   */
> >
> > -#include "sc7180.dtsi"
> > -
> >  ap_ec_spi: &spi6 {};
> >  ap_h1_spi: &spi0 {};
>
> Can we get rid of this node swap now? I think it is only around because
> early on we swapped the EC and H1 spi interfaces and then we had to swap
> it every time we made a new board.
>
> $ git grep ap_ec_spi
> arch/arm64/boot/dts/qcom/sc7180-trogdor-coachz.dtsi:ap_ec_spi: &spi6 {};
> arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor.dtsi:ap_ec_spi: &spi6 {};
> arch/arm64/boot/dts/qcom/sc7180-trogdor-pompom.dtsi:ap_ec_spi: &spi6 {};
> arch/arm64/boot/dts/qcom/sc7180-trogdor-r1.dts:ap_ec_spi: &spi6 {};
>
> It feels like we'd be better off leaving that quirk in trogdor-r0, which
> conveniently isn't upstream, and then relabel the spi nodes in
> sc7180-trogdor.dtsi now. Otherwise I look at this and have to remember
> that whenever this dtsi file is included, we've already included the
> sc7180.dtsi file before it, so that the relabel actually works.

I agree it'll be great if we can get rid of the node swap.
It's out of the scope of this patch series though.
We should probably send a separate patch for this change later?

>
> >
> >  #include "sc7180-trogdor.dtsi"
> > -#include "sc7180-trogdor-ti-sn65dsi86.dtsi"
> >
> >  &ap_sar_sensor {
> >         semtech,cs0-ground;