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Commit 61f4d6b4 authored by Naveen Krishna Ch's avatar Naveen Krishna Ch Committed by Wolfram Sang
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i2c: s3c2410: dont need CPU_FREQ transitions for exynos series 



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: default avatarNaveen Krishna Chatradhi <ch.naveen@samsung.com>
Acked-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: default avatarDoug Anderson <dianders@chromium.org>
Reviewed-by: default avatarTomasz Figa <t.figa@samsung.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 117053f7

drivers/i2c/busses/i2c-s3c2410.c

+2 −2
Original line number Diff line number Diff line
@@ -124,7 +124,7 @@ struct s3c24xx_i2c { 
	struct s3c2410_platform_i2c	*pdata;

	int			gpios[2];

	struct pinctrl          *pctrl;

#ifdef CONFIG_CPU_FREQ

#if defined(CONFIG_ARM_S3C24XX_CPUFREQ)

	struct notifier_block	freq_transition;

#endif

};
@@ -887,7 +887,7 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got) 
	return 0;

}



#ifdef CONFIG_CPU_FREQ

#if defined(CONFIG_ARM_S3C24XX_CPUFREQ)



#define freq_to_i2c(_n) container_of(_n, struct s3c24xx_i2c, freq_transition)