linux-kernel - Re: [PATCH v4 2/8] arm64: dts: qcom: add initial SM8650 dtsi

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Message-ID: <ZWWse_i-wjSTH8O4@gerhold.net>
Date:   Tue, 28 Nov 2023 10:01:47 +0100
From:   Stephan Gerhold <stephan@...hold.net>
To:     Neil Armstrong <neil.armstrong@...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 v4 2/8] arm64: dts: qcom: add initial SM8650 dtsi

On Fri, Nov 24, 2023 at 10:20:39AM +0100, Neil Armstrong wrote:
> Add initial DTSI for the Qualcomm SM8650 platform,
> only contains nodes which doesn't depend on interconnect.
> 
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sm8650.dtsi | 2439 ++++++++++++++++++++++++++++++++++
>  1 file changed, 2439 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8650.dtsi b/arch/arm64/boot/dts/qcom/sm8650.dtsi
> new file mode 100644
> index 000000000000..b0a9ca53d58e
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/sm8650.dtsi
> @@ -0,0 +1,2439 @@
> +[...]
> +		timer@...20000 {
> +			compatible = "arm,armv7-timer-mem";
> +			reg = <0 0x17420000 0 0x1000>;
> +
> +			ranges = <0 0 0 0x20000000>;
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +
> +			frame@...21000 {
> +				reg = <0x17421000 0x1000>,
> +				      <0x17422000 0x1000>;
> +
> +				interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>,
> +					     <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>;
> +
> +				frame-number = <0>;
> +			};
> +
> +			frame@...23000 {
> +				reg = <0x17423000 0x1000>;
> +
> +				interrupts = <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>;
> +
> +				frame-number = <1>;
> +
> +				status = "disabled";
> +			};
> +
> +			frame@...25000 {
> +				reg = <0x17425000 0x1000>;
> +
> +				interrupts = <GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>;
> +
> +				frame-number = <2>;
> +
> +				status = "disabled";
> +			};
> +
> +			frame@...27000 {
> +				reg = <0x17427000 0x1000>;
> +
> +				interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
> +
> +				frame-number = <3>;
> +
> +				status = "disabled";
> +			};
> +
> +			frame@...29000 {
> +				reg = <0x17429000 0x1000>;
> +
> +				interrupts = <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>;
> +
> +				frame-number = <4>;
> +
> +				status = "disabled";
> +			};
> +
> +			frame@...2b000 {
> +				reg = <0x1742b000 0x1000>;
> +
> +				interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
> +
> +				frame-number = <5>;
> +
> +				status = "disabled";
> +			};
> +
> +			frame@...2d000 {
> +				reg = <0x1742d000 0x1000>;
> +
> +				interrupts = <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>;
> +
> +				frame-number = <6>;
> +
> +				status = "disabled";
> +			};
> +		};

Nitpick: Personally I feel the empty lines between each property here
are a bit overly verbose. It would be better readable without them.
Might be personal preference though :-)

> +[...]
> +	timer {
> +		compatible = "arm,armv8-timer";
> +
> +		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>;

I'm pretty sure GIC_CPU_MASK_SIMPLE() is only valid & used on GICv2.
Unlike arm,gic.yaml, arm,gic-v3.yaml doesn't mention "bits[15:8] PPI
interrupt cpu mask". Also see e.g. commit 4a92b6d75bab ("arm64: dts:
msm8996: Fix wrong use of GIC_CPU_MASK_SIMPLE()").

Would be also good to check if any existing DTs have introduced this
incorrectly again since then.

Thanks,
Stephan