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

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Message-id: <55B09F9F.2050908@samsung.com>
Date:	Thu, 23 Jul 2015 17:02:39 +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 04:58 PM, Krzysztof Kozlowski wrote:
> On 23.07.2015 16:48, Chanwoo Choi wrote:
>> 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)
> 
> Does the Exynos5433 datasheet mention the "version 2"? I could not find
> such annotation in mine.

Yes, Exynos5433 datasheet don't include the detailed information of PPMU.
I check the version of PPMU on the released kernel source by System L.S.I.

> 
> Krzysztof
> 
>>
>> 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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