linux-kernel - Re: [PATCH] arm64: dts: qcom: sc8280xp-pmics: add explicit rtc interrupt parent

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Message-ID: <a584a43b-e414-0c21-f269-c48b6bb96d95@linaro.org>
Date:   Tue, 27 Jun 2023 12:43:46 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Patrick Wildt <patrick@...eri.se>
Subject: Re: [PATCH] arm64: dts: qcom: sc8280xp-pmics: add explicit rtc
 interrupt parent

On 27.06.2023 10:53, Johan Hovold wrote:
> Unless explicitly specified the interrupt-parent property is inherited
> from the parent node on Linux even though this may not be in full
> compliance with the devicetree specification.
> 
> Following commit 2d5cab9232ba ("arm64: dts: qcom: sc8280xp-pmics:
> Specify interrupt parent explicitly"), add an explicit interrupt parent
> also for the PMIC RTC node for the benefit of other operating systems
> which may be confused by this omission.
> 
> Note that any such OS must still implement a fallback to the root
> interrupt domain as most devicetrees are written under the assumption
> that the interrupt parent is inherited.
> 
> Reported-by: Patrick Wildt <patrick@...eri.se>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Maybe a warning in of core should be introduced..

Or maybe dtc could learn not to compile such DTS :P

Konrad
>  arch/arm64/boot/dts/qcom/sc8280xp-pmics.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-pmics.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp-pmics.dtsi
> index a0ba535bb6c9..80ee12ded4f4 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp-pmics.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp-pmics.dtsi
> @@ -101,7 +101,7 @@ pmk8280_rtc: rtc@...0 {
>  			compatible = "qcom,pmk8350-rtc";
>  			reg = <0x6100>, <0x6200>;
>  			reg-names = "rtc", "alarm";
> -			interrupts = <0x0 0x62 0x1 IRQ_TYPE_EDGE_RISING>;
> +			interrupts-extended = <&spmi_bus 0x0 0x62 0x1 IRQ_TYPE_EDGE_RISING>;
>  			wakeup-source;
>  			status = "disabled";
>  		};