dt-bindings: pwm: pwm-at91: Add PWM bindings for A5D2

Document the bindings needed for the PWM device on the SAMA5D2.

Signed-off-by: Dan Sneddon <dan.sneddon@microchip.com>

diff --git a/doc/device-tree-bindings/pwm/pwm-at91.txt b/doc/device-tree-bindings/pwm/pwm-at91.txt
new file mode 100644 (file)
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+++ b/doc/device-tree-bindings/pwm/pwm-at91.txt
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+Microchip AT91 PWM controller for SAMA5D2
+
+Required properties:
+  - compatible: Should be "atmel,sama5d2-pwm"
+  - reg: Physical base address and length of the controller's registers.
+  - clocks: Should contain a clock identifier for the PWM's parent clock.
+  - #pwm-cells: Should be 3.
+
+Example:
+
+pwm0: pwm@f802c000 {
+       compatible = "atmel,sama5d2-pwm";
+       reg = <0xf802c000 0x4000>;
+       clocks = <&pwm_clk>;
+       #pwm-cells = <3>;
+};