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authorNaveen Krishna Ch <ch.naveen@samsung.com>2013-11-26 09:52:46 +0530
committerWolfram Sang <wsa@the-dreams.de>2014-01-03 17:40:37 +0100
commit61f4d6b42158a836a008711a71b68cc78b0624aa (patch)
tree980b9746c04ec3e4b59b9a39c6431eb0df9622e4 /drivers/i2c
parent117053f77a5a4d055ec4fc7b4f6639045a24fefd (diff)
downloadlinux-61f4d6b42158a836a008711a71b68cc78b0624aa.tar.bz2
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 <ch.naveen@samsung.com> Acked-by: Kyungmin Park <kyungmin.park@samsung.com> Reviewed-by: Doug Anderson <dianders@chromium.org> Reviewed-by: Tomasz Figa <t.figa@samsung.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-s3c2410.c4
1 files changed, 2 insertions, 2 deletions
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)