linux-kernel - Re: [PATCH 2/2] PM / devfreq: exynos-ppmu: Update documentation to support PPMUv2

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Date:	Thu, 23 Jul 2015 16:37:02 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Chanwoo Choi <cw00.choi@...sung.com>, myungjoo.ham@...sung.com,
	kyungmin.park@...sung.com
Cc:	kgene@...nel.org, dan.carpenter@...cle.com,
	linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] PM / devfreq: exynos-ppmu: Update documentation to
 support PPMUv2

On 23.07.2015 10:57, Chanwoo Choi wrote:
> This patch updates the documentation to include the information of PPMUv2.
> The PPMUv2 is used for Exynos5433 and Exynos7420 to monitor the performance
> of each IP in Exynos SoC.
> 
> Cc: MyungJoo Ham <myungjoo.ham@...sung.com>
> Cc: Kyungmin Park <kyungmin.park@...sung.com>
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> ---
>  .../bindings/devfreq/event/exynos-ppmu.txt         | 42 ++++++++++++++++++++--
>  1 file changed, 40 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt b/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt
> index b54bf3a2ff57..e8fa6b6a1827 100644
> --- a/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt
> +++ b/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt
> @@ -11,7 +11,7 @@ to various devfreq devices. The devfreq devices would use the event data when
>  derterming the current state of each IP.
>  
>  Required properties:
> -- compatible: Should be "samsung,exynos-ppmu".
> +- compatible: Should be "samsung,exynos-ppmu" or "samsung,exynos-ppmu-v2.

I have doubts about "-v2" suffix. Why not using SoCs compatible suffix?
Is it related to ARM Performance Monitoring Unit v2 or maybe Samsung
just labelled it v2 for marketing purposes?

Best regards,
Krzysztof

>  - reg: physical base address of each PPMU and length of memory mapped region.
>  
>  Optional properties:
> @@ -19,7 +19,7 @@ Optional properties:
>  - clocks : phandles for clock specified in "clock-names" property
>  - #clock-cells: should be 1.
>  
> -Example1 : PPMU nodes in exynos3250.dtsi are listed below.
> +Example1 : PPMUv1 nodes in exynos3250.dtsi are listed below.
>  
>  		ppmu_dmc0: ppmu_dmc0@...a0000 {
>  			compatible = "samsung,exynos-ppmu";
> @@ -108,3 +108,41 @@ Example2 : Events of each PPMU node in exynos3250-rinato.dts are listed below.
>  			};
>  		};
>  	};
> +
> +Example3 : PPMUv2 nodes in exynos5433.dtsi are listed below.
> +
> +		ppmu_d0_cpu: ppmu_d0_cpu@...80000 {
> +			compatible = "samsung,exynos-ppmu-v2";
> +			reg = <0x10480000 0x2000>;
> +			status = "disabled";
> +		};
> +
> +		ppmu_d0_general: ppmu_d0_general@...90000 {
> +			compatible = "samsung,exynos-ppmu-v2";
> +			reg = <0x10490000 0x2000>;
> +			status = "disabled";
> +		};
> +
> +		ppmu_d0_rt: ppmu_d0_rt@...a0000 {
> +			compatible = "samsung,exynos-ppmu-v2";
> +			reg = <0x104a0000 0x2000>;
> +			status = "disabled";
> +		};
> +
> +		ppmu_d1_cpu: ppmu_d1_cpu@...b0000 {
> +			compatible = "samsung,exynos-ppmu-v2";
> +			reg = <0x104b0000 0x2000>;
> +			status = "disabled";
> +		};
> +
> +		ppmu_d1_general: ppmu_d1_general@...c0000 {
> +			compatible = "samsung,exynos-ppmu-v2";
> +			reg = <0x104c0000 0x2000>;
> +			status = "disabled";
> +		};
> +
> +		ppmu_d1_rt: ppmu_d1_rt@...d0000 {
> +			compatible = "samsung,exynos-ppmu-v2";
> +			reg = <0x104d0000 0x2000>;
> +			status = "disabled";
> +		};
> 

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