linux-kernel - Re: [PATCH v3 4/4] arm64: dts: qcom: sc8280xp-x13s: keep less regulators always-on

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Message-ID: <n7scbcdbse4m4rilkegqsinallgkryayjzqojnxtr7qozgxwp7@7mgropizypbz>
Date: Thu, 5 Sep 2024 22:27:24 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Johan Hovold <johan@...nel.org>, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v3 4/4] arm64: dts: qcom: sc8280xp-x13s: keep less
 regulators always-on

On Thu, Sep 05, 2024 at 08:23:39PM GMT, Bartosz Golaszewski wrote:
> On Thu, Sep 5, 2024 at 4:04 PM Johan Hovold <johan@...nel.org> wrote:
> >
> > On Thu, Sep 05, 2024 at 02:20:22PM +0200, Bartosz Golaszewski wrote:
> > > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> > >
> > > Remove the regulator-always-on property from the ones that used to be
> > > implicitly needed by the on-board WCN6855 now that its PMU is modeled in
> > > device-tree.
> > >
> > > Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> > > ---
> > >  arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts | 4 ----
> > >  1 file changed, 4 deletions(-)
> > >
> > > diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> > > index 88b31550f9df..1a9dac16c952 100644
> > > --- a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> > > +++ b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> > > @@ -479,7 +479,6 @@ vreg_s10b: smps10 {
> > >                       regulator-min-microvolt = <1800000>;
> > >                       regulator-max-microvolt = <1800000>;
> > >                       regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
> > > -                     regulator-always-on;
> > >               };
> >
> > What makes you think s10b is only used by wcn6855?
> >
> 
> I didn't say that. It's used by many components but they seem to be
> all described in DT. But I get it, the schematics show it in so many
> places, it would be risky to not keep it on.

Well, that depends on the consumers. If all consumers are good and
voting, then it should be safe.

> > You clearly did not check the schematics so make sure you verify the
> > rest as well before resending.
> >
> > And if any of these are valid, I think this should be part of the
> > previous patch.
> >
> 
> At least vreg_s11b and vreg_s12b should be fine. I'm not sure when
> I'll respin the series though, we need to first figure out whether to
> upstream the calibration variant property and what its name should be.

-- 
With best wishes
Dmitry