linux-kernel - Re: [PATCH v2 1/3] dt-bindings: power: rpmpd: Add MSM8974 power domains

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Date: Sun, 11 Feb 2024 12:19:14 +0100
From: Luca Weiss <luca@...tu.xyz>
To: Stephan Gerhold <stephan@...hold.net>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Ulf Hansson <ulf.hansson@...aro.org>,
 Matti Lehtimäki <matti.lehtimaki@...il.com>,
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject:
 Re: [PATCH v2 1/3] dt-bindings: power: rpmpd: Add MSM8974 power domains

On Sonntag, 11. Februar 2024 12:03:15 CET Stephan Gerhold wrote:
> On Sat, Feb 10, 2024 at 05:38:56PM +0100, Luca Weiss wrote:
> > Add the compatibles and indexes for the rpmpd in MSM8974, both with the
> > standard PM8841+PM8941 PMICs but also devices found with PMA8084.
> > 
> > Signed-off-by: Luca Weiss <luca@...tu.xyz>
> > ---
> > 
> >  Documentation/devicetree/bindings/power/qcom,rpmpd.yaml | 2 ++
> >  include/dt-bindings/power/qcom-rpmpd.h                  | 7 +++++++
> >  2 files changed, 9 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml
> > b/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml index
> > 2ff246cf8b81..929b7ef9c1bc 100644
> > --- a/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml
> > +++ b/Documentation/devicetree/bindings/power/qcom,rpmpd.yaml
> > 
> > @@ -24,6 +24,8 @@ properties:
> >            - qcom,msm8917-rpmpd
> >            - qcom,msm8939-rpmpd
> >            - qcom,msm8953-rpmpd
> > 
> > +          - qcom,msm8974-rpmpd
> > +          - qcom,msm8974pro-pma8084-rpmpd
> > 
> >            - qcom,msm8976-rpmpd
> >            - qcom,msm8994-rpmpd
> >            - qcom,msm8996-rpmpd
> 
> This is maybe more something for the DT reviewers to decide but I wonder
> if it is a bit confusing/misleading to describe one particular PMIC with
> a generic compatible, and the other with a more specific one. Perhaps it
> would be clearer to include the PMIC name in both compatibles, i.e.
> "qcom,msm8974-pm8941-rpmpd" instead of "qcom,msm8974-rpmpd".

FWIW if we'd do that it should be qcom,msm8974-pm8841-rpmpd (so pm8841 instead 
of pm8941)

But also in the same vain, it was maybe a bit of a bad decision originally to 
make the compatibles SoC-specific and not SoC+PMIC-specific - though in nearly 
all cases this combo is fixed for a given SoC?

Anyways, I'll wait for more comments about this, I'm open to changing it 
either way.

Regards
Luca

> 
> The "qcom,msm8974-rpmpd" compatible could be maybe added as fallback.
> While it wouldn't be used for matching in the (Linux) driver the DT
> binding itself *is* "compatible" between the two PMICs because they both
> have the same power domain indexes.
> 
> i.e.
> 	compatible = "qcom,msm8974-pm8941-rpmpd", "qcom,msm8974-rpmpd";
> 	compatible = "qcom,msm8974pro-pma8084-rpmpd", "qcom,msm8974-rpmpd";
> 
> Thanks,
> Stephan