From: Naveen Krishna Ch Date: Tue, 26 Nov 2013 04:22:46 +0000 (+0530) Subject: i2c: s3c2410: dont need CPU_FREQ transitions for exynos series X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=61f4d6b42158a836a008711a71b68cc78b0624aa;p=openwrt%2Fstaging%2Fblogic.git 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: Naveen Krishna Chatradhi Acked-by: Kyungmin Park Reviewed-by: Doug Anderson Reviewed-by: Tomasz Figa Signed-off-by: Wolfram Sang --- diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c index 09f251d0716f..db39d87bdc55 100644 --- a/drivers/i2c/busses/i2c-s3c2410.c +++ b/drivers/i2c/busses/i2c-s3c2410.c @@ -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)