linux-kernel - Re: [RFC PATCH 2/5] devfreq: event: Add exynos-ppmu devfreq evnet driver

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Date:	Tue, 23 Sep 2014 11:11:26 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	myungjoo.ham@...sung.com, linux-pm@...r.kernel.org,
	kyungmin.park@...sung.com, rafael.j.wysocki@...el.com,
	a.kesavan@...sung.com, kgene.kim@...sung.com,
	tomasz.figa@...il.com, b.zolnierkie@...sung.com, nm@...com,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 2/5] devfreq: event: Add exynos-ppmu devfreq evnet
 driver

Hi Paul,

On 09/12/2014 05:41 PM, Paul Bolle wrote:
> On Fri, 2014-09-05 at 13:30 +0900, Chanwoo Choi wrote:
>> This patch add exynos-ppmu devfreq event driver to provider raw data about
>> the utilization of each IP in Exynos SoC series.
>>
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
>> ---
>>  drivers/devfreq/Kconfig             |  10 +
>>  drivers/devfreq/event/Makefile      |   1 +
>>  drivers/devfreq/event/exynos-ppmu.c | 410 ++++++++++++++++++++++++++++++++++++
>>  3 files changed, 421 insertions(+)
>>  create mode 100644 drivers/devfreq/event/exynos-ppmu.c
>>
>> diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig
>> index ef839e7..4fbbcea 100644
>> --- a/drivers/devfreq/Kconfig
>> +++ b/drivers/devfreq/Kconfig
>> @@ -90,4 +90,14 @@ config ARM_EXYNOS5_BUS_DEVFREQ
>>  
>>  comment "DEVFREQ Event Drivers"
>>  
>> +config DEVFREQ_EVENT_EXYNOS_PPMU
>> +	bool "EXYNOS PPMU (Performance Profiling Monitoring Unit) DEVFREQ event Driver"
>> +	depends on ARCH_EXYNOS
>> +	select ARCH_HAS_OPP
> 
> This select statement can be dropped: see commit 78c5e0bb145d ("PM /
> OPP: Remove ARCH_HAS_OPP").

I'll drop it. 

> 
> By the way: there's a typo in the commit summary ("evnet").

My mistake, I'll fix typo.

Thanks for your review.
Chanwoo Choi

> 
>> +	select PM_OPP
>> +	help
>> +	 This add the DEVFREQ event driver for Exynos SoC. It provides PPMU
>> +	 (Performance Profiling Monitoring Unit) counters to estimate the
>> +	 utilization of each module.
>> +
>>  endif # PM_DEVFREQ
> 
> 
> Paul Bolle
> 
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