This patch adds allwinner R40, V40, T3 pwm binding documents.

Signed-off-by: hao_zhang <[email protected]>
---
 Documentation/devicetree/bindings/pwm/pwm-sun8i.txt | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/pwm-sun8i.txt

diff --git a/Documentation/devicetree/bindings/pwm/pwm-sun8i.txt 
b/Documentation/devicetree/bindings/pwm/pwm-sun8i.txt
new file mode 100644
index 0000000..2c86c67
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/pwm-sun8i.txt
@@ -0,0 +1,18 @@
+Allwinner sun8i R40/V40/T3 SoC PWM controller
+
+Required properties:
+  - compatible: should be one of:
+    - "allwinner,sun8i-r40-pwm"
+  - reg: physical base address and length of the controller's registers
+  - #pwm-cells: should be 3. See pwm.txt in this directory for a description of
+    the cells format.
+  - clocks: From common clock binding, handle to the parent clock.
+
+Example:
+
+pwm: pwm@1c23400 {
+            compatible = "allwinner,sun8i-r40-pwm";
+            reg = <0x01c23400 0x154>;
+            clocks = <&osc24M>;
+            #pwm-cells = <3>;
+};
-- 
2.7.4

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