ARM: S5P6440: Remove usage of clk_arm and add clk_armclk clock

The clk_arm clock is of type 'struct clk' whereas on S5P6440,
the arm clock is more suitable to be of type 'struct clksrc_clk'
(since arm clock is divided version of apll clock).

This patch modifies the following.

1. Removes the usage of clk_arm clock (defined in plat-s5p) and
   defines the new clock 'clk_armclk' of type 'struct clksrc_clk'.

2. Rearranges the assignment of clock rate for the fout_a/m/epll
   clocks. This will help in calculating the clock rate of fclk
   from clk_armclk clock and setup the clock rate for fout_m/epll
   for subsequent patches which depend on it.

3. Modifies the clock rate calculation of fclk to be based on
   the newly added clk_armclk 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, 16 insertions, 7 deletions

diff --git a/arch/arm/mach-s5p6440/clock.c b/arch/arm/mach-s5p6440/clock.c
index 8bd6f15a2ac1..2c6dd544ff62 100644
--- a/arch/arm/mach-s5p6440/clock.c
+++ b/arch/arm/mach-s5p6440/clock.c
@@ -247,6 +247,16 @@ static struct clk_ops s5p6440_clkarm_ops = {
         .round_rate     = s5p6440_armclk_round_rate,
 };
 
+static struct clksrc_clk clk_armclk = {
+        .clk    = {
+                .name   = "armclk",
+                .id     = 1,
+                .parent = &clk_mout_apll.clk,
+                .ops    = &s5p6440_clkarm_ops,
+        },
+        .reg_div        = { .reg = S5P_CLK_DIV0, .shift = 0, .size = 4 },
+};
+
 static struct clksrc_clk clk_dout_mpll = {
         .clk    = {
                 .name   = "dout_mpll",
@@ -569,6 +579,7 @@ static struct clksrc_clk *sysclks[] = {
         &clk_mout_epll,
         &clk_mout_mpll,
         &clk_dout_mpll,
+        &clk_armclk,
 };
 
 void __init_or_cpufreq s5p6440_setup_clocks(void)
@@ -592,8 +603,6 @@ void __init_or_cpufreq s5p6440_setup_clocks(void)
         clk_fout_epll.ops = &s5p6440_epll_ops;
 
         /* Set S5P6440 functions for arm clock */
-        clk_arm.parent = &clk_mout_apll.clk;
-        clk_arm.ops = &s5p6440_clkarm_ops;
         clk_48m.enable = s5p6440_clk48m_ctrl;
 
         clkdiv0 = __raw_readl(S5P_CLK_DIV0);
@@ -610,11 +619,15 @@ void __init_or_cpufreq s5p6440_setup_clocks(void)
         mpll = s5p_get_pll45xx(xtal, __raw_readl(S5P_MPLL_CON), pll_4502);
         apll = s5p_get_pll45xx(xtal, __raw_readl(S5P_APLL_CON), pll_4502);
 
+        clk_fout_mpll.rate = mpll;
+        clk_fout_epll.rate = epll;
+        clk_fout_apll.rate = apll;
+
         printk(KERN_INFO "S5P6440: PLL settings, A=%ld.%ldMHz, M=%ld.%ldMHz," \
                         " E=%ld.%ldMHz\n",
                         print_mhz(apll), print_mhz(mpll), print_mhz(epll));
 
-        fclk = apll / GET_DIV(clkdiv0, S5P_CLKDIV0_ARM);
+        fclk = clk_get_rate(&clk_armclk.clk);
         hclk = fclk / GET_DIV(clkdiv0, S5P_CLKDIV0_HCLK);
         pclk = hclk / GET_DIV(clkdiv0, S5P_CLKDIV0_PCLK);
 
@@ -633,10 +646,6 @@ void __init_or_cpufreq s5p6440_setup_clocks(void)
                         print_mhz(hclk), print_mhz(hclk_low),
                         print_mhz(pclk), print_mhz(pclk_low));
 
-        clk_fout_mpll.rate = mpll;
-        clk_fout_epll.rate = epll;
-        clk_fout_apll.rate = apll;
-
         clk_f.rate = fclk;
         clk_h.rate = hclk;
         clk_p.rate = pclk;