From patchwork Tue Nov 20 12:19:02 2012
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From: Piotr Wilczek
To: u-boot@lists.denx.de
Date: Tue, 20 Nov 2012 13:19:02 +0100
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Cc: Stephen Warren ,
Piotr Wilczek ,
Kyungmin Park ,
Tom Rini , Heiko Schocher
Subject: [U-Boot] [PATCH v2 1/6] exynos:clock: Add i2c clock
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This patch adds i2c clock for Exynos4
Signed-off-by: Piotr Wilczek
Signed-off-by: Kyungmin Park
CC: Minkyu Kang
---
Changes for v2:
- none
---
arch/arm/cpu/armv7/exynos/clock.c | 17 +++++++++++++++++
1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c
index 4f3b451..21e45d2 100644
--- a/arch/arm/cpu/armv7/exynos/clock.c
+++ b/arch/arm/cpu/armv7/exynos/clock.c
@@ -732,6 +732,21 @@ static unsigned long exynos5_get_i2c_clk(void)
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)
{
if (cpu_is_exynos5())
@@ -752,6 +767,8 @@ unsigned long get_i2c_clk(void)
{
if (cpu_is_exynos5()) {
return exynos5_get_i2c_clk();
+ } else if (cpu_is_exynos4()) {
+ return exynos4_get_i2c_clk();
} else {
debug("I2C clock is not set for this CPU\n");
return 0;