linux-kernel - Re: [PATCH] arm64: dts: qcom: sc8280xp-pmics: fix pon compatible and registers

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Date:   Mon, 3 Apr 2023 14:41:18 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sc8280xp-pmics: fix pon compatible and registers

On Mon, 3 Apr 2023 at 13:54, Johan Hovold <johan@...nel.org> wrote:
>
> On Mon, Apr 03, 2023 at 11:18:07AM +0200, Krzysztof Kozlowski wrote:
> > On 27/03/2023 14:29, Johan Hovold wrote:
> > > The pmk8280 PMIC PON peripheral is gen3 and uses two sets of registers;
> > > hlos and pbs.
> > >
> > > This specifically fixes the following error message during boot when the
> > > pbs registers are not defined:
> > >
> > >     PON_PBS address missing, can't read HW debounce time
> > >
> > > Note that this also enables the spurious interrupt workaround introduced
> > > by commit 0b65118e6ba3 ("Input: pm8941-pwrkey - add software key press
> > > debouncing support") (which may or may not be needed).
> > >
> > > Fixes: ccd3517faf18 ("arm64: dts: qcom: sc8280xp: Add reference device")
> > > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> > > ---
> > >  arch/arm64/boot/dts/qcom/sc8280xp-pmics.dtsi | 5 +++--
> > >  1 file changed, 3 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-pmics.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp-pmics.dtsi
> > > index c35e7f6bd657..a0ba535bb6c9 100644
> > > --- a/arch/arm64/boot/dts/qcom/sc8280xp-pmics.dtsi
> > > +++ b/arch/arm64/boot/dts/qcom/sc8280xp-pmics.dtsi
> > > @@ -59,8 +59,9 @@ pmk8280: pmic@0 {
> > >             #size-cells = <0>;
> > >
> > >             pmk8280_pon: pon@...0 {
> > > -                   compatible = "qcom,pm8998-pon";
> > > -                   reg = <0x1300>;
> > > +                   compatible = "qcom,pmk8350-pon";
> >
> > Same comment as Dmitry's. There is no compatible "qcom,pmk8350-pon"
> > ccd3517faf18, therefore indicated backport (through AUTOSEL) will lead
> > to invalid stable kernel.
> >
> > You must drop the Fixes tag, because this cannot be backported.
>
> That's bullshit. Do you see a stable tag? Is 5.19-stable still active?

I'd tend to agree with Johan here. Neither of us has added the Cc:stable tags

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

>
> The problem is that the driver was updated before the binding was so the
> above mentioned probe error has been there since this file was merged.
>
> AUTOSEL is crazy and people apparently just ignore it instead of NAKing
> when it is suggesting backporting devicetree cleanups (which to be fair
> should generally not have Fixes tags in the first place).
>
> If 5.19-stable was still active and someone suggested backporting this
> one, they would have to change the compatible string to match the
> inconsistent 5.19 kernel. Note that that would need to happen regardless
> of whether this patch has a Fixes tag or not.


-- 
With best wishes
Dmitry