linux-kernel - Re: [PATCH v2 2/2] arm64: dts: Add ARM PMU node for exynos7

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Message-ID: <9327f863-7fa3-a967-892c-67158b2471a9@osg.samsung.com>
Date:   Sat, 12 Nov 2016 11:33:18 -0300
From:   Javier Martinez Canillas <javier@....samsung.com>
To:     Alim Akhtar <alim.akhtar@...sung.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Cc:     krzk@...nel.org, will.deacon@....com, catalin.marinas@....com,
        linux-kernel@...r.kernel.org, robin.murphy@....com
Subject: Re: [PATCH v2 2/2] arm64: dts: Add ARM PMU node for exynos7

Hello Alim,

On 11/12/2016 07:17 AM, Alim Akhtar wrote:
> This patch adds ARM Performance Monitor Unit dt node for exynos7.
> PMU provides various statistics on the operation of the CPU and
> memory system at runtime, which are very useful when debugging or
> profiling code. This enables the same.
> 
> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
> ---
>  arch/arm64/boot/dts/exynos/exynos7.dtsi |   10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> Changes since v1:
> * Added "interrupt-affinity" property as per Robin Murphy review comment.
> 
> diff --git a/arch/arm64/boot/dts/exynos/exynos7.dtsi b/arch/arm64/boot/dts/exynos/exynos7.dtsi
> index 396ffb9..09e7a05b 100644
> --- a/arch/arm64/boot/dts/exynos/exynos7.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynos7.dtsi
> @@ -472,6 +472,16 @@
>  			status = "disabled";
>  		};
>  
> +		arm-pmu {
> +			compatible = "arm,cortex-a57-pmu", "arm,armv8-pmuv3";
> +			interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 58 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 59 IRQ_TYPE_LEVEL_HIGH>;
> +			interrupt-affinity = <&cpu_atlas0>, <&cpu_atlas1>,
> +					     <&cpu_atlas2>, <&cpu_atlas3>;
> +		};
> +

I didn't double check if these are the correct IRQs because I don't have
an Exynos7 user manual, but the change looks good to me.

Reviewed-by: Javier Martinez Canillas <javier@....samsung.com>

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America