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EXYNOS: CLK: Add i2c clock

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This adds i2c clock information for EXYNOS5.

Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Rajeshwari Shinde 2012-07-23 21:23:48 +00:00 committed by Heiko Schocher
parent 9c06782863
commit 989feb8c52
2 changed files with 34 additions and 0 deletions
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33
arch/arm/cpu/armv7/exynos/clock.c
View file

@ -578,6 +578,29 @@ void exynos4_set_mipi_clk(void)
writel(cfg, &clk->div_lcd0); writel(cfg, &clk->div_lcd0);
} }
/*
* I2C
*
* exynos5: obtaining the I2C clock
*/
static unsigned long exynos5_get_i2c_clk(void)
{
struct exynos5_clock *clk =
(struct exynos5_clock *)samsung_get_base_clock();
unsigned long aclk_66, aclk_66_pre, sclk;
unsigned int ratio;
sclk = get_pll_clk(MPLL);
ratio = (readl(&clk->div_top1)) >> 24;
ratio &= 0x7;
aclk_66_pre = sclk / (ratio + 1);
ratio = readl(&clk->div_top0);
ratio &= 0x7;
aclk_66 = aclk_66_pre / (ratio + 1);
return aclk_66;
}
unsigned long get_pll_clk(int pllreg) unsigned long get_pll_clk(int pllreg)
{ {
if (cpu_is_exynos5()) if (cpu_is_exynos5())
@ -594,6 +617,16 @@ unsigned long get_arm_clk(void)
return exynos4_get_arm_clk(); return exynos4_get_arm_clk();
} }
unsigned long get_i2c_clk(void)
{
if (cpu_is_exynos5()) {
return exynos5_get_i2c_clk();
} else {
debug("I2C clock is not set for this CPU\n");
return 0;
}
}
unsigned long get_pwm_clk(void) unsigned long get_pwm_clk(void)
{ {
if (cpu_is_exynos5()) if (cpu_is_exynos5())

1
arch/arm/include/asm/arch-exynos/clk.h
View file

@ -30,6 +30,7 @@
unsigned long get_pll_clk(int pllreg); unsigned long get_pll_clk(int pllreg);
unsigned long get_arm_clk(void); unsigned long get_arm_clk(void);
unsigned long get_i2c_clk(void);
unsigned long get_pwm_clk(void); unsigned long get_pwm_clk(void);
unsigned long get_uart_clk(int dev_index); unsigned long get_uart_clk(int dev_index);
void set_mmc_clk(int dev_index, unsigned int div); void set_mmc_clk(int dev_index, unsigned int div);