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

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Date:	Thu, 23 Jul 2015 16:48:38 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
	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 07/23/2015 04:37 PM, Krzysztof Kozlowski wrote:
> 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?

As I knew, the version of PPMU was decided by SoC designer without any dependency.

If we prefer to use the SoC name instead of '-v2' version on compatible name,
we can change them as following:
- samsung,exynos-ppmu -> samsung,exynos4210-ppmu
  (because Exynos4210 used the PPMU v1 for the first time)
- samsung,exynos-ppmu-v2 -> samsung,exynos5433-ppmu
  (because Exynos5433 used the PPMU v2 for the first time)

Best Regards,
Chanwoo Choi

> 
> 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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