linux-kernel - Re: [PATCH v2 0/6] arm64: dts: qcom: Fix broken regulator spec on RPMH boards

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Date:   Thu, 1 Sep 2022 17:44:03 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andrew Halaney <ahalaney@...hat.com>,
        Mark Brown <broonie@...nel.org>,
        Andy Gross <agross@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Vinod Koul <vkoul@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/6] arm64: dts: qcom: Fix broken regulator spec on
 RPMH boards

Hi,

On Thu, Sep 1, 2022 at 8:52 AM Johan Hovold <johan@...nel.org> wrote:
>
> On Wed, Aug 31, 2022 at 07:52:52AM -0700, Doug Anderson wrote:
> > Hi,
> >
> > On Tue, Aug 30, 2022 at 11:47 PM Johan Hovold <johan@...nel.org> wrote:
> > >
> > > On Mon, Aug 29, 2022 at 09:49:46AM -0700, Douglas Anderson wrote:
> > > > Prior to commit efb0cb50c427 ("regulator: qcom-rpmh: Implement
> > > > get_optimum_mode(), not set_load()") several boards were able to
> > > > change their regulator mode even though they had nothing listed in
> > > > "regulator-allowed-modes". After that commit (and fixes [1]) we'll be
> > > > stuck at the initial mode. Discussion of this (again, see [1]) has
> > > > resulted in the decision that the old dts files were wrong and should
> > > > be fixed to fully restore old functionality.
> > > >
> > > > This series attempts to fix everyone. I've kept each board in a
> > > > separate patch to make stable / backports work easier.
> > >
> > > Should you also update the bindings so that this can be caught during
> > > devicetree validation? That is, to always require
> > > "regulator-allowed-modes" when "regulator-allow-set-load" is specified.
> >
> > Yeah, it's probably a good idea. I'm happy to review a patch that does
> > that. I'm already quite a few patches deep of submitting random
> > cleanups because someone mentioned it in a code review. ;-) That's
> > actually how I got in this mess to begin with. The RPMH change was in
> > response to a request in a different code review. ...and that came
> > about in a code review that was posted in response to a comment about
> > how awkward setting regulator loads was... Need to get back to my day
> > job.
>
> Heh.
>
> > In any case, I think these dts patches are ready to land now.
>
> Yeah, as the old dtbs are now broken with newer kernels these are indeed
> needed.

With the latest patches in the regulator tree things shouldn't be
_too_ broken even without the dts files. Essentially things will get
stuck at their initial mode (HPM). So without these patches things
should all still boot but could possibly end up at a higher power
state.

-Doug