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exynos:clock: Add i2c clock

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This patch adds i2c clock for Exynos4

Signed-off-by: Piotr Wilczek <p.wilczek@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
CC: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Piotr Wilczek 2012-11-20 02:19:02 +00:00 committed by Tom Rini
parent 66839773a8
commit 83d745dd88
1 changed files with 17 additions and 0 deletions
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17
arch/arm/cpu/armv7/exynos/clock.c
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@ -732,6 +732,21 @@ static unsigned long exynos5_get_i2c_clk(void)
return aclk_66; return aclk_66;
} }
static unsigned long exynos4_get_i2c_clk(void)
{
struct exynos4_clock *clk =
(struct exynos4_clock *)samsung_get_base_clock();
unsigned long sclk, aclk_100;
unsigned int ratio;
sclk = get_pll_clk(APLL);
ratio = (readl(&clk->div_top)) >> 4;
ratio &= 0xf;
aclk_100 = sclk / (ratio + 1);
return aclk_100;
}
unsigned long get_pll_clk(int pllreg) unsigned long get_pll_clk(int pllreg)
{ {
if (cpu_is_exynos5()) if (cpu_is_exynos5())
@ -752,6 +767,8 @@ unsigned long get_i2c_clk(void)
{ {
if (cpu_is_exynos5()) { if (cpu_is_exynos5()) {
return exynos5_get_i2c_clk(); return exynos5_get_i2c_clk();
} else if (cpu_is_exynos4()) {
return exynos4_get_i2c_clk();
} else { } else {
debug("I2C clock is not set for this CPU\n"); debug("I2C clock is not set for this CPU\n");
return 0; return 0;