linux-kernel - Re: [PATCH v3 2/4] dt-bindings: phy: qcom,qmp: Describe 'vdda-max-microamp' & 'vdda-pll-max-microamp' properties

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Message-ID: <CAH=2NtxqRyZ4tOZKu1m3pRR9TgVBpQZq5ExDXF=di85HzVDa=w@mail.gmail.com>
Date:   Tue, 19 Apr 2022 09:06:22 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        bhupesh.linux@...il.com, agross@...nel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org, vkoul@...nel.org, bjorn.andersson@...aro.org,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v3 2/4] dt-bindings: phy: qcom,qmp: Describe
 'vdda-max-microamp' & 'vdda-pll-max-microamp' properties

On Tue, 19 Apr 2022 at 04:04, Dmitry Baryshkov
<dmitry.baryshkov@...aro.org> wrote:
>
> On Mon, 18 Apr 2022 at 23:55, Bhupesh Sharma <bhupesh.sharma@...aro.org> wrote:
> >
> > Since a few boards based on QCoM qmp phy use the
> > 'vdda-max-microamp' & 'vdda-pll-max-microamp' properties to
> > describe the ufs phy nodes, add them to the dt-bindings doc as well.
>
> Ugh. They give a false sense that they are supported. I think in
> reality they are not used by the kernel.
> So, ideally, this patch should be accompanied with regulator core change.
> Or (better) drop them completely.

Indeed. However, the earlier reviews were contrary to this
understanding. Maybe, @Bjorn Andersson can help with more background
on the same.

Although I agree that since this appears mainly in sm8450 and sm8350
dts and is relevant for ufs qmp phy nodes, I can send patches for
cleaning up the dts files instead.

My hunch is that these have been copied over into the qcom dts/dtsi
files from the similar  ones described in [1].

[1]. https://www.kernel.org/doc/Documentation/devicetree/bindings/ufs/ufs-qcom.txt

Thanks,
Bhupesh


> >
> > This fixes the following '$ make dtbs_check' warning(s):
> >
> > sm8350-microsoft-surface-duo2.dt.yaml: phy@...7000:
> >   'vdda-max-microamp', 'vdda-pll-max-microamp' do not match any of
> >    the regexes: '^phy@[0-9a-f]+$', 'pinctrl-[0-9]+'
> >
> > Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> > Cc: Vinod Koul <vkoul@...nel.org>
> > Acked-by: Rob Herring <robh@...nel.org>
> > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> > ---
> >  Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml
> > index c39ead81ecd7..411c79dbfa15 100644
> > --- a/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml
> > +++ b/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml
> > @@ -90,6 +90,14 @@ properties:
> >      minItems: 1
> >      maxItems: 3
> >
> > +  vdda-max-microamp:
> > +    description:
> > +      Specifies max. load that can be drawn from phy supply.
> > +
> > +  vdda-pll-max-microamp:
> > +    description:
> > +      Specifies max. load that can be drawn from pll supply.
> > +
> >    vdda-phy-supply:
> >      description:
> >        Phandle to a regulator supply to PHY core block.
> > --
> > 2.35.1
> >
>
>
> --
> With best wishes
> Dmitry