clk: sunxi: Implement A31 PLL6 as a divs clock for 2x output

Some clock modules on the A31 use PLL6x2 as one of their inputs.
This patch changes the PLL6 implementation for A31 to a divs clock,
i.e. clock with multiple outputs that have different dividers.
The first output will be the normal PLL6 output, and the second
will be PLL6x2.

This patch fixes the PLL6 N factor in the clock driver, and removes
any /2 dividers in the PLL6 factors clock part. The N factor counts
from 1 to 32, mapping to values 0 to 31, as shown in the A31 manual.

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

1 files changed, 17 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
index d199f9153e04..67b2b99f2b33 100644
--- a/Documentation/devicetree/bindings/clock/sunxi.txt
+++ b/Documentation/devicetree/bindings/clock/sunxi.txt
@@ -71,8 +71,9 @@ Required properties for all clocks:
         multiplexed clocks, the list order must match the hardware
         programming order.
 - #clock-cells : from common clock binding; shall be set to 0 except for
-        "allwinner,*-gates-clk", "allwinner,sun4i-pll5-clk" and
-        "allwinner,sun4i-pll6-clk" where it shall be set to 1
+        the following compatibles where it shall be set to 1:
+        "allwinner,*-gates-clk", "allwinner,sun4i-pll5-clk",
+        "allwinner,sun4i-pll6-clk", "allwinner,sun6i-a31-pll6-clk"
 - clock-output-names : shall be the corresponding names of the outputs.
         If the clock module only has one output, the name shall be the
         module name.
@@ -87,6 +88,12 @@ Clock consumers should specify the desired clocks they use with a
 "clocks" phandle cell. Consumers that are using a gated clock should
 provide an additional ID in their clock property. This ID is the
 offset of the bit controlling this particular gate in the register.
+For the other clocks with "#clock-cells" = 1, the additional ID shall
+refer to the index of the output.
+
+For "allwinner,sun6i-a31-pll6-clk", there are 2 outputs. The first output
+is the normal PLL6 output, or "pll6". The second output is rate doubled
+PLL6, or "pll6x2".
 
 For example:
 
@@ -114,6 +121,14 @@ pll5: clk@01c20020 {
         clock-output-names = "pll5_ddr", "pll5_other";
 };
 
+pll6: clk@01c20028 {
+        #clock-cells = <1>;
+        compatible = "allwinner,sun6i-a31-pll6-clk";
+        reg = <0x01c20028 0x4>;
+        clocks = <&osc24M>;
+        clock-output-names = "pll6", "pll6x2";
+};
+
 cpu: cpu@01c20054 {
         #clock-cells = <0>;
         compatible = "allwinner,sun4i-a10-cpu-clk";