linux-kernel - Re: [PATCH v4] i2c: s3c2410: dont need CPU

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Message-ID: <20140103162351.GI7132@katana>
Date:	Fri, 3 Jan 2014 17:23:52 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Naveen Krishna Chatradhi <ch.naveen@...sung.com>
Cc:	linux-i2c@...r.kernel.org, sjg@...omium.org,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	ben-linux@...ff.org, grant.likely@...retlab.ca, broonie@...nel.org,
	dianders@...omium.org, cpgs@...sung.com, t.figa@...sung.com
Subject: Re: [PATCH v4] i2c: s3c2410: dont need CPU_FREQ transitions for
 exynos series

On Tue, Nov 26, 2013 at 09:52:46AM +0530, Naveen Krishna Chatradhi 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>

Applied to for-next, thanks!


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