[U-Boot] [PATCH 1/8 V6] EXYNOS: CLK: Add i2c clock

[Rajeshwari Shinde]

This adds i2c clock information for EXYNOS5.

Signed-off-by: Alim Akhtar <alim.akh...@samsung.com>
Signed-off-by: Doug Anderson <diand...@chromium.org>
Signed-off-by: Rajeshwari Shinde <rajeshwar...@samsung.com>
Acked-by: Simon Glass <s...@chromium.org>
---
changes in V2:
        - Incorporated comments from Simon Glass which are removed extra
          braces around (readl(&clk->div_top1)) >> 24 and gave a tab space for
          return statement.
Changes in V3:
        - None
Changes in V4:
        - None
Changes in V5:
        - None.
Changes in V6:
        - Incorporated review comments from Simon Glass.
 arch/arm/cpu/armv7/exynos/clock.c      |   33 ++++++++++++++++++++++++++++++++
 arch/arm/include/asm/arch-exynos/clk.h |    1 +
 2 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/arch/arm/cpu/armv7/exynos/clock.c 
b/arch/arm/cpu/armv7/exynos/clock.c
index 672598f..de3db8e 100644
--- a/arch/arm/cpu/armv7/exynos/clock.c
+++ b/arch/arm/cpu/armv7/exynos/clock.c
@@ -605,6 +605,29 @@ void exynos4_set_mipi_clk(void)
        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)
 {
        if (cpu_is_exynos5())
@@ -621,6 +644,16 @@ unsigned long get_arm_clk(void)
                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)
 {
        if (cpu_is_exynos5())
diff --git a/arch/arm/include/asm/arch-exynos/clk.h 
b/arch/arm/include/asm/arch-exynos/clk.h
index e99339a..5529025 100644
--- a/arch/arm/include/asm/arch-exynos/clk.h
+++ b/arch/arm/include/asm/arch-exynos/clk.h
@@ -31,6 +31,7 @@
 
 unsigned long get_pll_clk(int pllreg);
 unsigned long get_arm_clk(void);
+unsigned long get_i2c_clk(void);
 unsigned long get_pwm_clk(void);
 unsigned long get_uart_clk(int dev_index);
 void set_mmc_clk(int dev_index, unsigned int div);
-- 
1.7.4.4

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