linux-kernel - Re: [PATCH v2] arm64: dts: qcom: sa8540p-ride: enable rtc

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Date:   Wed, 9 Aug 2023 16:46:43 -0400
From:   Eric Chanudet <echanude@...hat.com>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Caleb Connolly <caleb.connolly@...aro.org>
Subject: Re: [PATCH v2] arm64: dts: qcom: sa8540p-ride: enable rtc

On Tue, Aug 08, 2023 at 02:36:46PM -0700, Bjorn Andersson wrote:
> On Fri, Jul 21, 2023 at 08:59:30PM -0700, Bjorn Andersson wrote:
> > On Tue, Jul 18, 2023 at 10:46:10AM -0400, Eric Chanudet wrote:
> > > diff --git a/arch/arm64/boot/dts/qcom/sa8540p-ride.dts b/arch/arm64/boot/dts/qcom/sa8540p-ride.dts
> > [..]
> > > +&pmm8540a_sdam_7 {
> > > +	status = "okay";
> > > +
> > > +	rtc_offset: rtc-offset@ac {
> > > +		reg = <0xac 0x4>;
> > 
> > I'm still trying to get confirmation that this is a good choice.
> > 
> 
> I'm recommended that you use 0xa0 from SDAM2, "preferably in the second
> PMM8540", instead.
> 
> Can you please give this a try, Eric?

That worked, the offset was saved and read back upon rebooting from the
system. I did get a defer on some tests waiting for the second pmic,
which I presume is not surprising:
[    0.257064] spmi spmi-0: PMIC arbiter version v5 (0x50020000)
[    8.340386] platform c440000.spmi:pmic@0:rtc@...0: error -EPROBE_DEFER: wait for supplier /soc@...pmi@...0000/pmic@...vram@...0/rtc-offset@a0
[    8.393201] platform c440000.spmi:pmic@0:rtc@...0: error -EPROBE_DEFER: wait for supplier /soc@...pmi@...0000/pmic@...vram@...0/rtc-offset@a0
[    8.465407] rtc-pm8xxx c440000.spmi:pmic@0:rtc@...0: registered as rtc0
[    8.479612] rtc-pm8xxx c440000.spmi:pmic@0:rtc@...0: setting system clock to 2023-08-09T19:16:08 UTC (1691608568)

Here is the v3 with the changes:
    https://lore.kernel.org/linux-arm-msm/20230809203506.1833205-1-echanude@redhat.com

Thank you again for the feedback.

-- 
Eric Chanudet