linux-kernel - Re: [PATCH v2 3/3] arm64: dts: qcom: sc7180: Add CoachZ rev3

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Date:   Mon, 15 Mar 2021 15:50:39 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] arm64: dts: qcom: sc7180: Add CoachZ rev3

On Mon, Mar 15, 2021 at 02:49:04PM -0700, Doug Anderson wrote:
> Hi,
> 
> On Fri, Mar 12, 2021 at 10:32 AM Matthias Kaehlcke <mka@...omium.org> wrote:
> >
> > CoachZ rev3 uses a 100k NTC thermistor for the charger temperatures,
> > instead of the 47k NTC that is stuffed in earlier revisions. Add .dts
> > files for rev3.
> >
> > The 47k NTC currently isn't supported by the PM6150 ADC driver.
> > Disable the charger thermal zone for rev1 and rev2 to avoid the use
> > of bogus temperature values.
> >
> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> > ---
> >
> > Changes in v2:
> > - added CoachZ rev3
> > - updated subject and commit message
> >
> >  arch/arm64/boot/dts/qcom/Makefile              |  2 ++
> >  .../boot/dts/qcom/sc7180-trogdor-coachz-r1.dts |  9 +++++++++
> >  .../dts/qcom/sc7180-trogdor-coachz-r2-lte.dts  |  4 ++--
> >  .../boot/dts/qcom/sc7180-trogdor-coachz-r2.dts | 13 +++++++++++--
> >  .../dts/qcom/sc7180-trogdor-coachz-r3-lte.dts  | 18 ++++++++++++++++++
> >  .../boot/dts/qcom/sc7180-trogdor-coachz-r3.dts | 15 +++++++++++++++
> >  6 files changed, 57 insertions(+), 4 deletions(-)
> 
> So what you have here is good and we could land it. Feel free to add
> my Reviewed-by tag if you want.
> 
> ...but I want to propose an alternative. It turns out that these days
> coachz-r1 and coachz-r2 are actually the same. The only reason both
> exist is because <https://crrev.com/c/2733863> ("CHROMIUM: arm64: dts:
> qcom: sc7180: add dmic_clk_en back") wasn't the proper inverse of
> <https://crrev.com/c/2596726> ("CHROMIUM: arm64: dts: qcom: sc7180:
> remove dmic_clk_en").
> 
> It sorta squashes two changes into one, but if you combined your
> change with one that folded "-r1" into "-r2" it would actually make a
> smaller / easier to understand change, essentially, it would be:
> - just a rename of the "-r2" file to be "-r3"
> - add "-rev2" into the list of compatibles in "-r1" file.
> - add the "disable" into the "-r1" file.

I agree, if rev1 and rev2 are the same in terms of the DT they
should use the same file(s).