dt-bindings: sunxi: Add CCU binding documentation

Introduce a new binding with its documentation for the brand new clock
sub-framework.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/20160629190535.11855-2-maxime.ripard@free-electrons.com

diff --git a/Documentation/devicetree/bindings/clock/sunxi-ccu.txt b/Documentation/devicetree/bindings/clock/sunxi-ccu.txt
new file mode 100644 (file)
index 0000000..cb91507
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/sunxi-ccu.txt
@@ -0,0 +1,24 @@
+Allwinner Clock Control Unit Binding
+------------------------------------
+
+Required properties :
+- compatible: must contain one of the following compatible:
+               - "allwinner,sun8i-h3-ccu"
+
+- reg: Must contain the registers base address and length
+- clocks: phandle to the oscillators feeding the CCU. Two are needed:
+  - "hosc": the high frequency oscillator (usually at 24MHz)
+  - "losc": the low frequency oscillator (usually at 32kHz)
+- clock-names: Must contain the clock names described just above
+- #clock-cells : must contain 1
+- #reset-cells : must contain 1
+
+Example:
+ccu: clock@01c20000 {
+       compatible = "allwinner,sun8i-h3-ccu";
+       reg = <0x01c20000 0x400>;
+       clocks = <&osc24M>, <&osc32k>;
+       clock-names = "hosc", "losc";
+       #clock-cells = <1>;
+       #reset-cells = <1>;
+};