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

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Message-ID: <CAD=FV=Xq4bd8j3_to_9rJmyqWTi-78OWVCd0meaJ9e_pmOH+Rg@mail.gmail.com>
Date:   Mon, 15 Mar 2021 14:49:04 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Matthias Kaehlcke <mka@...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

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.

Anyway, I'll leave it up to you.


-Doug