clk: sunxi: pll2: Add A13 support

The A13, unlike the A10 and A20, doesn't use a pass-through exception for
the 0 value in the pre and post dividers, but increments all the values
written in the register by one.

Add an exception for both these cases to handle them nicely.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>

diff --git a/drivers/clk/sunxi/clk-a10-pll2.c b/drivers/clk/sunxi/clk-a10-pll2.c
index a57742a..5484c31 100644 (file)
--- a/drivers/clk/sunxi/clk-a10-pll2.c
+++ b/drivers/clk/sunxi/clk-a10-pll2.c
@@ -41,9 +41,15 @@
 
 #define SUN4I_PLL2_OUTPUTS             4
 
+struct sun4i_pll2_data {
+       u32     post_div_offset;
+       u32     pre_div_flags;
+};
+
 static DEFINE_SPINLOCK(sun4i_a10_pll2_lock);
 
-static void __init sun4i_pll2_setup(struct device_node *node)
+static void __init sun4i_pll2_setup(struct device_node *node,
+                                   struct sun4i_pll2_data *data)
 {
        const char *clk_name = node->name, *parent;
        struct clk **clks, *base_clk, *prediv_clk;
@@ -70,8 +76,7 @@ static void __init sun4i_pll2_setup(struct device_node *node)
                                          parent, 0, reg,
                                          SUN4I_PLL2_PRE_DIV_SHIFT,
                                          SUN4I_PLL2_PRE_DIV_WIDTH,
-                                         CLK_DIVIDER_ONE_BASED |
-                                         CLK_DIVIDER_ALLOW_ZERO,
+                                         data->pre_div_flags,
                                          &sun4i_a10_pll2_lock);
        if (!prediv_clk) {
                pr_err("Couldn't register the prediv clock\n");
@@ -122,7 +127,7 @@ static void __init sun4i_pll2_setup(struct device_node *node)
         */
        val = readl(reg);
        val &= ~(SUN4I_PLL2_POST_DIV_MASK << SUN4I_PLL2_POST_DIV_SHIFT);
-       val |= SUN4I_PLL2_POST_DIV_VALUE << SUN4I_PLL2_POST_DIV_SHIFT;
+       val |= (SUN4I_PLL2_POST_DIV_VALUE - data->post_div_offset) << SUN4I_PLL2_POST_DIV_SHIFT;
        writel(val, reg);
 
        of_property_read_string_index(node, "clock-output-names",
@@ -185,4 +190,27 @@ err_free_data:
 err_unmap:
        iounmap(reg);
 }
-CLK_OF_DECLARE(sun4i_pll2, "allwinner,sun4i-a10-pll2-clk", sun4i_pll2_setup);
+
+static struct sun4i_pll2_data sun4i_a10_pll2_data = {
+       .pre_div_flags  = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO,
+};
+
+static void __init sun4i_a10_pll2_setup(struct device_node *node)
+{
+       sun4i_pll2_setup(node, &sun4i_a10_pll2_data);
+}
+
+CLK_OF_DECLARE(sun4i_a10_pll2, "allwinner,sun4i-a10-pll2-clk",
+              sun4i_a10_pll2_setup);
+
+static struct sun4i_pll2_data sun5i_a13_pll2_data = {
+       .post_div_offset        = 1,
+};
+
+static void __init sun5i_a13_pll2_setup(struct device_node *node)
+{
+       sun4i_pll2_setup(node, &sun5i_a13_pll2_data);
+}
+
+CLK_OF_DECLARE(sun5i_a13_pll2, "allwinner,sun5i-a13-pll2-clk",
+              sun5i_a13_pll2_setup);