s5pc210: clock: add comments

Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

diff --git a/arch/arm/cpu/armv7/s5pc2xx/clock.c b/arch/arm/cpu/armv7/s5pc2xx/clock.c
index ab6402b..38ca346 100644 (file)
--- a/arch/arm/cpu/armv7/s5pc2xx/clock.c
+++ b/arch/arm/cpu/armv7/s5pc2xx/clock.c
@@ -131,6 +131,10 @@ static unsigned long s5pc210_get_pwm_clk(void)
        unsigned int sel;
        unsigned int ratio;
 
+       /*
+        * CLK_SRC_PERIL0
+        * PWM_SEL [27:24]
+        */
        sel = readl(&clk->src_peril0);
        sel = (sel >> 24) & 0xf;
 
@@ -143,6 +147,10 @@ static unsigned long s5pc210_get_pwm_clk(void)
        else
                return 0;
 
+       /*
+        * CLK_DIV_PERIL3
+        * PWM_RATIO [3:0]
+        */
        ratio = readl(&clk->div_peril3);
        ratio = ratio & 0xf;
 
@@ -160,6 +168,15 @@ static unsigned long s5pc210_get_uart_clk(int dev_index)
        unsigned int sel;
        unsigned int ratio;
 
+       /*
+        * CLK_SRC_PERIL0
+        * UART0_SEL [3:0]
+        * UART1_SEL [7:4]
+        * UART2_SEL [8:11]
+        * UART3_SEL [12:15]
+        * UART4_SEL [16:19]
+        * UART5_SEL [23:20]
+        */
        sel = readl(&clk->src_peril0);
        sel = (sel >> (dev_index << 2)) & 0xf;
 
@@ -172,6 +189,15 @@ static unsigned long s5pc210_get_uart_clk(int dev_index)
        else
                return 0;
 
+       /*
+        * CLK_DIV_PERIL0
+        * UART0_RATIO [3:0]
+        * UART1_RATIO [7:4]
+        * UART2_RATIO [8:11]
+        * UART3_RATIO [12:15]
+        * UART4_RATIO [16:19]
+        * UART5_RATIO [23:20]
+        */
        ratio = readl(&clk->div_peril0);
        ratio = (ratio >> (dev_index << 2)) & 0xf;
 
@@ -189,6 +215,10 @@ static unsigned long s5pc210_get_lcd_clk(void)
        unsigned int sel;
        unsigned int ratio;
 
+       /*
+        * CLK_SRC_LCD0
+        * FIMD0_SEL [3:0]
+        */
        sel = readl(&clk->src_lcd0);
        sel = sel & 0xf;
 
@@ -201,6 +231,10 @@ static unsigned long s5pc210_get_lcd_clk(void)
        else
                return 0;
 
+       /*
+        * CLK_DIV_LCD0
+        * FIMC0_RATIO [3:0]
+        */
        ratio = readl(&clk->div_lcd0);
        ratio = ratio & 0xf;