linux-kernel - Re: [PATCH v2 03/18] dt-bindings: msm: dsi-controller-main: Add vdd* descriptions back in

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Date:   Tue, 8 Nov 2022 19:55:52 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     "Bryan O'Donoghue" <bryan.odonoghue@...aro.org>
Cc:     robdclark@...il.com, quic_abhinavk@...cinc.com,
        krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org,
        quic_mkrishn@...cinc.com, linux-arm-msm@...r.kernel.org,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 03/18] dt-bindings: msm: dsi-controller-main: Add vdd*
 descriptions back in

On Tue, 8 Nov 2022 at 17:42, Bryan O'Donoghue
<bryan.odonoghue@...aro.org> wrote:
>
> On 08/11/2022 12:59, Dmitry Baryshkov wrote:
> >>
> >> Warnings about missing regulators can be resolved by updating the
> >> relevant
> >> dtsi files to point to fixed always-on regulators where appropriate.
> >
> > Ugh. Are they missing or are they optional/not used on these platforms?
>
> Some platforms either don't implement them or worse possibly do
> implement but don't model them when they should.
>
> > Can you possibly list all regulator warnings?
>
>
> Downstream we have
>
> arch/arm/boot/dts/qcom/msm8916-mdss.dtsi
>
> mdss_dsi0: qcom,mdss_dsi@...8000 {
>         vdda-supply = <&pm8916_l2>;
>         vdd-supply = <&pm8916_l17>;
>         vddio-supply = <&pm8916_l6>;
> };
>
> Looking at something like
>
> arch/arm/boot/dts/qcom/msm8916-mtp.dtsi which references
> arch/arm/boot/dts/qcom/dsi-panel-jdi-1080p-video.dtsi it doesn't appear
> to delete andy of the vdd*-supply references

Good example. We have vdda-supply and vddio-supply in
msm8916-pm8916.dtsi (correct).
And the mentioned vdd-supply is not applicable to this platform. It
powers up the external DSI-to-HDMI bridge. I'd assume that the same
regulator was destined to power up the panel.

So, I'd suggest defining all supplies at the top level and then
pushing all the required: parts into the per-SoC entries.

-- 
With best wishes
Dmitry