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 --- 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 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 330bd75..a80928b 100644 --- a/arch/arm/cpu/armv7/exynos/clock.c +++ b/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()) diff --git a/arch/arm/include/asm/arch-exynos/clk.h b/arch/arm/include/asm/arch-exynos/clk.h index 637fb4b..72dc655 100644 --- a/arch/arm/include/asm/arch-exynos/clk.h +++ b/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);