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

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Date:   Tue, 18 Jul 2023 10:57:42 -0400
From:   Eric Chanudet <echanude@...hat.com>
To:     Caleb Connolly <caleb.connolly@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...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
Subject: Re: [PATCH] arm64: dts: qcom: sa8540p-ride: enable rtc

On Mon, Jul 17, 2023 at 09:28:15PM +0100, Caleb Connolly wrote:
> On 17/07/2023 19:23, Eric Chanudet wrote:
> > SA8540P-ride is one of the Qualcomm platforms that does not have access
> > to UEFI runtime services and on which the RTC registers are read-only,
> > as described in:
> > https://lore.kernel.org/all/20230202155448.6715-1-johan+linaro@kernel.org/
> > 
> > Reserve four bytes in one of the PMIC registers to hold the RTC offset
> > the same way as it was done for sc8280xp-crd which has similar
> > limitations:
> >     commit e67b45582c5e ("arm64: dts: qcom: sc8280xp-crd: enable rtc")
> > 
> > One small difference on SA8540P-ride, the PMIC register bank SDAM6 is
> > not writable, so use SDAM7 instead.
> > 
> > Signed-off-by: Eric Chanudet <echanude@...hat.com>
> > ---
> >  arch/arm64/boot/dts/qcom/sa8540p-pmics.dtsi | 10 +++++++++-
> >  arch/arm64/boot/dts/qcom/sa8540p-ride.dts   | 15 +++++++++++++++
> >  2 files changed, 24 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sa8540p-pmics.dtsi b/arch/arm64/boot/dts/qcom/sa8540p-pmics.dtsi
> > index 1221be89b3de..9c5dcad35cce 100644
> > --- a/arch/arm64/boot/dts/qcom/sa8540p-pmics.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sa8540p-pmics.dtsi
> > @@ -14,7 +14,7 @@ pmm8540a: pmic@0 {
> >  		#address-cells = <1>;
> >  		#size-cells = <0>;
> >  
> > -		rtc@...0 {
> > +		pmm8540a_rtc: rtc@...0 {
> >  			compatible = "qcom,pm8941-rtc";
> >  			reg = <0x6000>, <0x6100>;
> >  			reg-names = "rtc", "alarm";
> > @@ -22,6 +22,14 @@ rtc@...0 {
> >  			wakeup-source;
> >  		};
> >  
> > +		pmm8540a_sdam_7: nvram@...0 {
> Johan disabled the SDAM node in their series for sc8280xp. Unless it's
> used on all sa8540p platforms, you should probably also do that here.
> 
> 			
> > +			compatible = "qcom,spmi-sdam";
> > +			reg = <0xb610>;
> > +			#address-cells = <1>;
> > +			#size-cells = <1>;
> > +			ranges = <0 0xb610 0xb0>;
> 			status = "disabled";
> 
> With that fix,
> 
> Reviewed-by: Caleb Connolly <caleb.connolly@...aro.org>

Thank you for the review. Here is the v2 with the requested change:
https://lore.kernel.org/linux-arm-msm/20230718145105.3464105-1-echanude@redhat.com/

Best,

-- 
Eric Chanudet