linux-kernel - Re: [PATCH 03/13] ARM: dts: qcom: add missing rpm regulators and cells for ipq8064

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Date:   Wed, 6 Jul 2022 14:55:41 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.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, Jonathan McDowell <noodles@...th.li>
Subject: Re: [PATCH 03/13] ARM: dts: qcom: add missing rpm regulators and
 cells for ipq8064

On Wed, 6 Jul 2022 at 13:26, Christian Marangi <ansuelsmth@...il.com> wrote:
> On Wed, Jul 06, 2022 at 10:34:16AM +0200, Krzysztof Kozlowski wrote:
> > On 05/07/2022 15:39, Christian Marangi wrote:
> > > Add cells definition for rpm node and add missing regulators for the 4
> > > regulator present on ipq8064. There regulators are controlled by rpm and
> > > to correctly works gsbi4_i2c require to be NEVER disabled or rpm will
> > > reject any regulator change request.
> > >
> > > Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> > > Tested-by: Jonathan McDowell <noodles@...th.li>

[...]

>
> > > +
> > >                     rpmcc: clock-controller {
> > >                             compatible = "qcom,rpmcc-ipq806x", "qcom,rpmcc";
> > >                             #clock-cells = <1>;
> > >                     };
> > > +
> > > +                   smb208_regulators: regulators {
> > > +                           compatible = "qcom,rpm-smb208-regulators";
> > > +                           status = "okay";
> >
> > Was the node disabled?
> >
>
> smb208 is the normal and advised way to handle regulators on this
> platform. Some device may want to not follow that and implement their
> own regulator bypassing rpm so we add a status and on the current device
> present upstream we set it disabled as it does use different regulators
> implementation.

Yep, this is correct. But you don't have to define status = 'okay'. It
is the default.

There are two typical patterns:
1) Disable by default
foo.dtsi:
    abc: def {
        status = "disabled";
    };
foo-bar.dtsi:
    &abc { status = "okay"; }

2) Enable by default
foo.dtsi:
    abc: def {
        /* usual properties */
    };
foo-bar.dtsi:
    &abc { status = "disabled"; }


-- 
With best wishes
Dmitry