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 <[email protected]>
Acked-by: Kyungmin Park <[email protected]>
Reviewed-by: Doug Anderson <[email protected]>
Reviewed-by: Tomasz Figa <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 09f251d0716fc19b6202c934ba585cceab2dfd1b..db39d87bdc55a612e24147a45e29b550af1174ea 100644 (file)
--- 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)