linux-kernel - Re: [PATCH 1/8] dt-bindings: qcom: rpmh-regulator: Add compatible for SA8155p-adp board pmics

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Date:   Tue, 15 Jun 2021 10:13:41 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        bhupesh.linux@...il.com
Subject: Re: [PATCH 1/8] dt-bindings: qcom: rpmh-regulator: Add compatible for
 SA8155p-adp board pmics

On Mon, 14 Jun 2021 at 21:58, Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> On Mon 14 Jun 03:05 CDT 2021, Bhupesh Sharma wrote:
>
> > Hello Bjorn,
> >
> > Thanks for the review comments.
> >
> > On Fri, 11 Jun 2021 at 08:18, Bjorn Andersson
> > <bjorn.andersson@...aro.org> wrote:
> > >
> > > On Mon 07 Jun 06:38 CDT 2021, Bhupesh Sharma wrote:
> > >
> > > > Add compatible strings for pmm8155au_1 and pmm8155au_2 pmics
> > > > found on SA8155p-adp board.
> > > >
> > > > Cc: Linus Walleij <linus.walleij@...aro.org>
> > > > Cc: Liam Girdwood <lgirdwood@...il.com>
> > > > Cc: Mark Brown <broonie@...nel.org>
> > > > Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> > > > Cc: Vinod Koul <vkoul@...nel.org>
> > > > Cc: Rob Herring <robh+dt@...nel.org>
> > > > Cc: Andy Gross <agross@...nel.org>
> > > > Cc: devicetree@...r.kernel.org
> > > > Cc: linux-kernel@...r.kernel.org
> > > > Cc: linux-gpio@...r.kernel.org
> > > > Cc: bhupesh.linux@...il.com
> > > > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> > > > ---
> > > >  .../devicetree/bindings/regulator/qcom,rpmh-regulator.yaml      | 2 ++
> > > >  1 file changed, 2 insertions(+)
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/regulator/qcom,rpmh-regulator.yaml b/Documentation/devicetree/bindings/regulator/qcom,rpmh-regulator.yaml
> > > > index e561a5b941e4..ea5cd71aa0c7 100644
> > > > --- a/Documentation/devicetree/bindings/regulator/qcom,rpmh-regulator.yaml
> > > > +++ b/Documentation/devicetree/bindings/regulator/qcom,rpmh-regulator.yaml
> > > > @@ -55,6 +55,8 @@ properties:
> > > >        - qcom,pm8009-1-rpmh-regulators
> > > >        - qcom,pm8150-rpmh-regulators
> > > >        - qcom,pm8150l-rpmh-regulators
> > > > +      - qcom,pmm8155au-1-rpmh-regulators
> > > > +      - qcom,pmm8155au-2-rpmh-regulators
> > >
> > > Looking at the component documentation and the schematics I think the
> > > component is "PMM8155AU" and we have two of them.
> > >
> > > Unless I'm mistaken we should have the compatible describe the single
> > > component and we should have DT describe the fact that we have 2 of
> > > them.
> >
> > If we refer to the PM8155AU device specifications, there are two
> > regulators mentioned there PMM8155AU_1 and PMM8155AU_2. Although most
> > parameters of the regulators seem similar the smps regulator summary
> > for both appear different (Transient Load, mA ratings etc).
> >
> > Although most of these differences don't probably matter to the Linux
> > world, others like the gpios on the pmic are different.
> >
> > So, IMO, it makes sense to mention the different pmic types on the board.
> >
> > Please let me know your views on the same.
> >
>
> Afaict, they are both physically the same component, but there is some
> configuration differences between them. I don't see any differences that
> will show up in Linux, but afaict we would capture those in the DT
> anyways.
>
> Let me know if you see anything I'm missing, but I think we should have
> a single compatible.

As discussed on IRC, let's go with the approach you suggested (I can
propose followup patches if I find something amiss). I will send a v2
shortly.

Thanks,
Bhupesh