linux-kernel - Re: [PATCH v3] i2c: s3c2410: dont need CPU

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Message-ID: <CAHfPSqAT1XgA+3n_SG6R7OYPS1pruMkxE30KjCbbvR6YhDOQew@mail.gmail.com>
Date:	Tue, 26 Nov 2013 09:37:25 +0530
From:	Naveen Krishna Ch <naveenkrishna.ch@...il.com>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Naveen Krishna Chatradhi <ch.naveen@...sung.com>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	Simon Glass <sjg@...omium.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Ben Dooks <ben-linux@...ff.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"cpgs ." <cpgs@...sung.com>, Tomasz Figa <t.figa@...sung.com>
Subject: Re: [PATCH v3] i2c: s3c2410: dont need CPU_FREQ transitions for
 exynos series

Hello Doug,

On 26 November 2013 05:11, Doug Anderson <dianders@...omium.org> wrote:
> Naveen,
>
> On Mon, Nov 18, 2013 at 10:18 PM, Naveen Krishna Chatradhi
> <ch.naveen@...sung.com> wrote:
>> For Exynos4 and Exynos5 SoCs from Samsung the i2c clock is based
>> on a fixed 66 MHz peripheral clock, and therefore is completely
>> independent of the cpu frequency.
>> Thus, registering for a CPU freq notifier is very wasteful.
>>
>> This patch modifes the code such that, i2c bus registers to
>> cpu_freq_transition only if CONFIG_CPU_FREQ_S3C24XX is enabled.
>>
>> This change should save a bunch of cpufreq transitions calls
>> which does not apply to exynos SoCs.
>>
>> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@...sung.com>
>> Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
>> Reviewed-by: Doug Anderson <dianders@...omium.org>
>> ---
>> Changes since v2:
>> None, Rebased on for-next of linux-i2c git repo.
>>
>> Changes since v1:
>> Use CONFIG_CPU_FREQ_S3C24XX instead of (CONFIG_CPU_FREQ & !CONFIG_EXYNOS)
>> As commented by Tomasz
>>
>>  drivers/i2c/busses/i2c-s3c2410.c |    4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> Can you please spin this with comments from
> <https://patchwork.kernel.org/patch/3235091/>?  Thanks!
Thanks for pointing out for me

To summarize, Post f023f8dd59 commit we should be using
ARM_S3C24XX_CPUFREQ instead of ARM_S3C24XX_CPUFREQ right.

Will re-spin with this changes.
>
> -Doug
> --
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-- 
Thanks & Regards,
(: Nav :)
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