linux-kernel - Re: [PATCH v16 0/3] eDP/DP Phy vdda realted function

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Message-ID: <CAD=FV=XVxhZwJFmOAg2v1UmfOt9_HWz0LG8M3wac+RkMPGOwYg@mail.gmail.com>
Date:   Thu, 21 Jul 2022 18:28:40 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     Johan Hovold <johan@...nel.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Stephen Boyd <swboyd@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Andy Gross <agross@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "Abhinav Kumar (QUIC)" <quic_abhinavk@...cinc.com>,
        "Aravind Venkateswaran (QUIC)" <quic_aravindh@...cinc.com>,
        Sankeerth Billakanti <quic_sbillaka@...cinc.com>,
        freedreno <freedreno@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v16 0/3] eDP/DP Phy vdda realted function

Hi,

On Thu, Jul 21, 2022 at 7:52 AM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Thu, Jul 21, 2022 at 7:39 AM Doug Anderson <dianders@...omium.org> wrote:
> >
> > > You could add a way to specify constant base loads in DT on either a per
> > > regulator or per consumer basis.
> >
> > Yes, this please! ...on a per consumer basis. :-) It's been on my
> > wishlist for a while and would eliminate a massive amount of code /
> > tables in the drivers.
> >
> > We could debate syntax, but I guess you'd either do it w/ two cells
> >
> > vdda-phy-supply = <&vdda_mipi_dsi0_1p2 21800>;
> >
> > ...or with matching properties:
> >
> > vdda-phy-supply = <&vdda_mipi_dsi0_1p2>;
> > vdda-phy-supply-base-load = <21800>;
>
> Ah, sorry to respond to my own thread so quickly, but I just thought
> of a reason for the "matching properties" solution instead of the two
> cells. It would allow the SoC "dtsi" file to specify a base load while
> the board "dts" file can then specify the supply. That feels like it
> could be a nice solution.

This seemed easy, so I whipped up a quick prototype. Forewarned that I
did very little detailed testing. I didn't CC everyone on this thread,
but hopefully folks can find it if they are interested...

https://lore.kernel.org/r/20220721182622.RFC.1.I8a64b707169cfd73d9309c5eaf5d43b8bc4db988@changeid

-Doug