ARM: S5P6440: Remove usage of clk_h_low and add clk_hclk_low clock

The clk_h_low clock is of type 'struct clk' whereas on S5P6440,
the hclk_low clock is more suitable to be of type 'struct clksrc_clk'
(since hclk_low clock is derived from a choice of clock sources and
then divided by a divisor).

This patch modifies the following.

1. Removes the definition and usage of clk_h_clk clock.
2. Adds the clk_hclk_low clock of type 'struct clksrc_clk' clock.
3. Adds clk_hclk_low to the list of system clocks.
4. The clock rate of hclk_low is derived from the clk_hclk_low clock.

Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 28 insertions, 26 deletions

diff --git a/arch/arm/mach-s5p6440/clock.c b/arch/arm/mach-s5p6440/clock.c
index 61bc85b098ff..c70b3a4075e9 100644
--- a/arch/arm/mach-s5p6440/clock.c
+++ b/arch/arm/mach-s5p6440/clock.c
@@ -134,15 +134,6 @@ static struct clksrc_clk clk_mout_mpll = {
         .reg_src        = { .reg = S5P_CLK_SRC0, .shift = 1, .size = 1 },
 };
 
-static struct clk clk_h_low = {
-        .name           = "hclk_low",
-        .id             = -1,
-        .rate           = 0,
-        .parent         = NULL,
-        .ctrlbit        = 0,
-        .ops            = &clk_ops_def_setrate,
-};
-
 static struct clk clk_p_low = {
         .name           = "pclk_low",
         .id             = -1,
@@ -284,6 +275,26 @@ static struct clksrc_clk clk_pclk = {
         .reg_div = { .reg = S5P_CLK_DIV0, .shift = 12, .size = 4 },
 };
 
+static struct clk *clkset_hclklow_list[] = {
+        &clk_mout_apll.clk,
+        &clk_mout_mpll.clk,
+};
+
+static struct clksrc_sources clkset_hclklow = {
+        .sources        = clkset_hclklow_list,
+        .nr_sources     = ARRAY_SIZE(clkset_hclklow_list),
+};
+
+static struct clksrc_clk clk_hclk_low = {
+        .clk = {
+                .name   = "hclk_low",
+                .id     = -1,
+        },
+        .sources        = &clkset_hclklow,
+        .reg_src        = { .reg = S5P_SYS_OTHERS, .shift = 6, .size = 1 },
+        .reg_div        = { .reg = S5P_CLK_DIV3, .shift = 8, .size = 4 },
+};
+
 int s5p6440_clk48m_ctrl(struct clk *clk, int enable)
 {
         unsigned long flags;
@@ -405,37 +416,37 @@ static struct clk init_clocks_disable[] = {
         }, {
                 .name           = "otg",
                 .id             = -1,
-                .parent         = &clk_h_low,
+                .parent         = &clk_hclk_low.clk,
                 .enable         = s5p6440_hclk0_ctrl,
                 .ctrlbit        = S5P_CLKCON_HCLK0_USB
         }, {
                 .name           = "post",
                 .id             = -1,
-                .parent         = &clk_h_low,
+                .parent         = &clk_hclk_low.clk,
                 .enable         = s5p6440_hclk0_ctrl,
                 .ctrlbit        = S5P_CLKCON_HCLK0_POST0
         }, {
                 .name           = "lcd",
                 .id             = -1,
-                .parent         = &clk_h_low,
+                .parent         = &clk_hclk_low.clk,
                 .enable         = s5p6440_hclk1_ctrl,
                 .ctrlbit        = S5P_CLKCON_HCLK1_DISPCON,
         }, {
                 .name           = "hsmmc",
                 .id             = 0,
-                .parent         = &clk_h_low,
+                .parent         = &clk_hclk_low.clk,
                 .enable         = s5p6440_hclk0_ctrl,
                 .ctrlbit        = S5P_CLKCON_HCLK0_HSMMC0,
         }, {
                 .name           = "hsmmc",
                 .id             = 1,
-                .parent         = &clk_h_low,
+                .parent         = &clk_hclk_low.clk,
                 .enable         = s5p6440_hclk0_ctrl,
                 .ctrlbit        = S5P_CLKCON_HCLK0_HSMMC1,
         }, {
                 .name           = "hsmmc",
                 .id             = 2,
-                .parent         = &clk_h_low,
+                .parent         = &clk_hclk_low.clk,
                 .enable         = s5p6440_hclk0_ctrl,
                 .ctrlbit        = S5P_CLKCON_HCLK0_HSMMC2,
         }, {
@@ -600,6 +611,7 @@ static struct clksrc_clk *sysclks[] = {
         &clk_armclk,
         &clk_hclk,
         &clk_pclk,
+        &clk_hclk_low,
 };
 
 void __init_or_cpufreq s5p6440_setup_clocks(void)
@@ -650,15 +662,7 @@ void __init_or_cpufreq s5p6440_setup_clocks(void)
         fclk = clk_get_rate(&clk_armclk.clk);
         hclk = clk_get_rate(&clk_hclk.clk);
         pclk = clk_get_rate(&clk_pclk.clk);
-
-        if (__raw_readl(S5P_OTHERS) & S5P_OTHERS_HCLK_LOW_SEL_MPLL) {
-                /* Asynchronous mode */
-                hclk_low = mpll / GET_DIV(clkdiv3, S5P_CLKDIV3_HCLK_LOW);
-        } else {
-                /* Synchronous mode */
-                hclk_low = apll / GET_DIV(clkdiv3, S5P_CLKDIV3_HCLK_LOW);
-        }
-
+        hclk_low = clk_get_rate(&clk_hclk_low.clk);
         pclk_low = hclk_low / GET_DIV(clkdiv3, S5P_CLKDIV3_PCLK_LOW);
 
         printk(KERN_INFO "S5P6440: HCLK=%ld.%ldMHz, HCLK_LOW=%ld.%ldMHz," \
@@ -669,7 +673,6 @@ void __init_or_cpufreq s5p6440_setup_clocks(void)
         clk_f.rate = fclk;
         clk_h.rate = hclk;
         clk_p.rate = pclk;
-        clk_h_low.rate = hclk_low;
         clk_p_low.rate = pclk_low;
 
         for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
@@ -681,7 +684,6 @@ static struct clk *clks[] __initdata = {
         &clk_iis_cd_v40,
         &clk_pcm_cd,
         &clk_p_low,
-        &clk_h_low,
 };
 
 void __init s5p6440_register_clocks(void)