From mboxrd@z Thu Jan 1 00:00:00 1970 From: Naveen Krishna Chatradhi Subject: [PATCH] i2c: s3c2410: dont need CPU_FREQ transitions for exynos series Date: Fri, 11 Oct 2013 16:56:54 +0530 Message-ID: <1381490814-20890-1-git-send-email-ch.naveen@samsung.com> Return-path: Sender: linux-samsung-soc-owner@vger.kernel.org To: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org Cc: wsa@the-dreams.de, khali@linux-fr.org, ben-linux@fluff.org, grant.likely@secretlab.ca, devicetree-discuss@lists.ozlabs.org, sjg@chromium.org, naveenkrishna.ch@gmail.com, broonie@opensource.wolfsonmicro.com, diander@google.com, cpgs@samsung.com List-Id: linux-i2c@vger.kernel.org The exynos5 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 for non Exynos SoCs. This change should save a bunch of cpufreq transitions calls which does not apply to exynos SoCs. Signed-off-by: Naveen Krishna Chatradhi --- drivers/i2c/busses/i2c-s3c2410.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c index cab1c91..d062fa7 100644 --- a/drivers/i2c/busses/i2c-s3c2410.c +++ b/drivers/i2c/busses/i2c-s3c2410.c @@ -123,7 +123,7 @@ struct s3c24xx_i2c { struct s3c2410_platform_i2c *pdata; int gpios[2]; struct pinctrl *pctrl; -#ifdef CONFIG_CPU_FREQ +#if defined(CONFIG_CPU_FREQ) && !defined(CONFIG_ARCH_EXYNOS) struct notifier_block freq_transition; #endif }; @@ -843,7 +843,7 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got) return 0; } -#ifdef CONFIG_CPU_FREQ +#if defined(CONFIG_CPU_FREQ) && !defined(CONFIG_ARCH_EXYNOS) #define freq_to_i2c(_n) container_of(_n, struct s3c24xx_i2c, freq_transition) -- 1.7.9.5