linux-kernel - Re: [PATCH] arm64: dts: qcom: pmk8350: Make RTC disabled by default; enable on sc7280-idp

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Message-ID: <YXTY6BdmKBa+jPeN@builder.lan>
Date:   Sat, 23 Oct 2021 22:54:16 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     satya priya <skakit@...eaurora.org>, Vinod Koul <vkoul@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...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] arm64: dts: qcom: pmk8350: Make RTC disabled by default;
 enable on sc7280-idp

On Mon 18 Oct 16:45 CDT 2021, Doug Anderson wrote:

> Bjorn,
> 
> On Wed, Sep 29, 2021 at 9:00 PM <skakit@...eaurora.org> wrote:
> >
> > On 2021-09-30 04:08, Douglas Anderson wrote:
> > > The RTC on the pmk8350 is not useful on all boards. Some boards may
> > > not provide backup power to the PMIC but might have another RTC on the
> > > board that does have backup power. In this case it's better to not use
> > > the RTC on the PMIC.
> > >
> > > At the moment, the only boards that includes this PMIC are sc7280-idp
> > > and sc7280-idp2. On sc7280-idp I'm not aware of any other RTCs, but
> > > sc7280-idp2 has a Chrome OS EC on it and this is intended to provide
> > > the RTC for the AP.
> > >
> > > Let's do what we normally do for hardware that's not used by all
> > > boards and set it to a default status of "disabled" and then enable it
> > > on the boards that need it.
> > >
> > > NOTE: for sc7280-idp it's _possible_ we might also want to add
> > > `allow-set-time;`. That could be the subject of a future patch if it
> > > is indeed true.
> > >
> > > Signed-off-by: Douglas Anderson <dianders@...omium.org>
> > > ---
> > >
> >
> > Reviewed-by: Satya Priya <skakit@...eaurora.org>
> 
> If you're still accepting patches for 5.16, it'd be keen if you'd
> consider taking this one. Thanks!
> 

I've picked the patch and hope to get it included in v5.16.

I do however not understand why the commit message so clearly defines
that the only device including pmk8350 is the sc7280 idp when the
sm8350-mtp.dts contains the following line:

#include "pmk8350.dtsi"


Perhaps I'm missing something obvious, but I took the liberty of also
enabling the RTC in the SM8350 MTP.

Regards,
Bjorn