clk: sunxi: Add support for PLL6 on the A31

The A31 has a slightly different PLL6 clock. Add support for this new clock in
our driver.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Emilio López <emilio@elopez.com.ar>

2 files changed, 46 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
index ca2b6920fca4..c37c764cbbc5 100644
--- a/Documentation/devicetree/bindings/clock/sunxi.txt
+++ b/Documentation/devicetree/bindings/clock/sunxi.txt
@@ -11,6 +11,7 @@ Required properties:
         "allwinner,sun6i-a31-pll1-clk" - for the main PLL clock on A31
         "allwinner,sun4i-pll5-clk" - for the PLL5 clock
         "allwinner,sun4i-pll6-clk" - for the PLL6 clock
+        "allwinner,sun6i-a31-pll6-clk" - for the PLL6 clock on A31
         "allwinner,sun4i-cpu-clk" - for the CPU multiplexer clock
         "allwinner,sun4i-axi-clk" - for the AXI clock
         "allwinner,sun4i-axi-gates-clk" - for the AXI gates
diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index a779c31b0de9..d4cf297e8fac 100644
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -252,7 +252,38 @@ static void sun4i_get_pll5_factors(u32 *freq, u32 parent_rate,
         *n = DIV_ROUND_UP(div, (*k+1));
 }
 
+/**
+ * sun6i_a31_get_pll6_factors() - calculates n, k factors for A31 PLL6
+ * PLL6 rate is calculated as follows
+ * rate = parent_rate * n * (k + 1) / 2
+ * parent_rate is always 24Mhz
+ */
+
+static void sun6i_a31_get_pll6_factors(u32 *freq, u32 parent_rate,
+                                       u8 *n, u8 *k, u8 *m, u8 *p)
+{
+        u8 div;
+
+        /*
+         * We always have 24MHz / 2, so we can just say that our
+         * parent clock is 12MHz.
+         */
+        parent_rate = parent_rate / 2;
+
+        /* Normalize value to a parent_rate multiple (24M / 2) */
+        div = *freq / parent_rate;
+        *freq = parent_rate * div;
+
+        /* we were called to round the frequency, we can now return */
+        if (n == NULL)
+                return;
+
+        *k = div / 32;
+        if (*k > 3)
+                *k = 3;
 
+        *n = DIV_ROUND_UP(div, (*k+1));
+}
 
 /**
  * sun4i_get_apb1_factors() - calculates m, p factors for APB1
@@ -420,6 +451,13 @@ static struct clk_factors_config sun4i_pll5_config = {
         .kwidth = 2,
 };
 
+static struct clk_factors_config sun6i_a31_pll6_config = {
+        .nshift = 8,
+        .nwidth = 5,
+        .kshift = 4,
+        .kwidth = 2,
+};
+
 static struct clk_factors_config sun4i_apb1_config = {
         .mshift = 0,
         .mwidth = 5,
@@ -469,6 +507,12 @@ static const struct factors_data sun4i_pll6_data __initconst = {
         .name = "pll6",
 };
 
+static const struct factors_data sun6i_a31_pll6_data __initconst = {
+        .enable = 31,
+        .table = &sun6i_a31_pll6_config,
+        .getter = sun6i_a31_get_pll6_factors,
+};
+
 static const struct factors_data sun4i_apb1_data __initconst = {
         .table = &sun4i_apb1_config,
         .getter = sun4i_get_apb1_factors,
@@ -1069,6 +1113,7 @@ free_clkdata:
 static const struct of_device_id clk_factors_match[] __initconst = {
         {.compatible = "allwinner,sun4i-pll1-clk", .data = &sun4i_pll1_data,},
         {.compatible = "allwinner,sun6i-a31-pll1-clk", .data = &sun6i_a31_pll1_data,},
+        {.compatible = "allwinner,sun6i-a31-pll6-clk", .data = &sun6i_a31_pll6_data,},
         {.compatible = "allwinner,sun4i-apb1-clk", .data = &sun4i_apb1_data,},
         {.compatible = "allwinner,sun4i-mod0-clk", .data = &sun4i_mod0_data,},
         {.compatible = "allwinner,sun7i-a20-out-clk", .data = &sun7i_a20_out_data,},