EXYNOS: CLK: Add i2c clock

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>

arch/arm/cpu/armv7/exynos/clock.c

@@ -578,6 +578,29 @@ 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())
@@ -594,6 +617,16 @@ 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())

arch/arm/include/asm/arch-exynos/clk.h

@@ -30,6 +30,7 @@
 
 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);