MIPS: ath79: Fix the ar913x reference clock rate

The reference clock on ar913x is at 40MHz and not 5MHz. The current
implementation use the wrong reference rate because it doesn't take
the PLL divider in account. But if we fix the code to use the divider
it becomes identical with the implementation for ar724x, so just drop
the broken ar913x implementation.

Signed-off-by: Alban Bedel <albeu@free.fr>
Tested-by: Antony Pavlov <antonynpavlov@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12871/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/ath79/clock.c b/arch/mips/ath79/clock.c
index ed2846578405500ca2cc20d965360fcb13a8f191..618dfd735eede5e771061d6a42943150d19b93a6 100644 (file)
--- a/arch/mips/ath79/clock.c
+++ b/arch/mips/ath79/clock.c
@@ -27,7 +27,6 @@
 
 #define AR71XX_BASE_FREQ       40000000
 #define AR724X_BASE_FREQ       40000000
-#define AR913X_BASE_FREQ       5000000
 
 static struct clk *clks[3];
 static struct clk_onecell_data clk_data = {
@@ -123,39 +122,6 @@ static void __init ar724x_clocks_init(void)
        clk_add_alias("uart", NULL, "ahb", NULL);
 }
 
-static void __init ar913x_clocks_init(void)
-{
-       unsigned long ref_rate;
-       unsigned long cpu_rate;
-       unsigned long ddr_rate;
-       unsigned long ahb_rate;
-       u32 pll;
-       u32 freq;
-       u32 div;
-
-       ref_rate = AR913X_BASE_FREQ;
-       pll = ath79_pll_rr(AR913X_PLL_REG_CPU_CONFIG);
-
-       div = ((pll >> AR913X_PLL_FB_SHIFT) & AR913X_PLL_FB_MASK);
-       freq = div * ref_rate;
-
-       cpu_rate = freq;
-
-       div = ((pll >> AR913X_DDR_DIV_SHIFT) & AR913X_DDR_DIV_MASK) + 1;
-       ddr_rate = freq / div;
-
-       div = (((pll >> AR913X_AHB_DIV_SHIFT) & AR913X_AHB_DIV_MASK) + 1) * 2;
-       ahb_rate = cpu_rate / div;
-
-       ath79_add_sys_clkdev("ref", ref_rate);
-       clks[0] = ath79_add_sys_clkdev("cpu", cpu_rate);
-       clks[1] = ath79_add_sys_clkdev("ddr", ddr_rate);
-       clks[2] = ath79_add_sys_clkdev("ahb", ahb_rate);
-
-       clk_add_alias("wdt", NULL, "ahb", NULL);
-       clk_add_alias("uart", NULL, "ahb", NULL);
-}
-
 static void __init ar933x_clocks_init(void)
 {
        unsigned long ref_rate;
@@ -443,10 +409,8 @@ void __init ath79_clocks_init(void)
 {
        if (soc_is_ar71xx())
                ar71xx_clocks_init();
-       else if (soc_is_ar724x())
+       else if (soc_is_ar724x() || soc_is_ar913x())
                ar724x_clocks_init();
-       else if (soc_is_ar913x())
-               ar913x_clocks_init();
        else if (soc_is_ar933x())
                ar933x_clocks_init();
        else if (soc_is_ar934x())