dt-bindings: pwm: Add bindings for Meson PWM Controller

Add bindings for the Amlogic PWM Controller in Meson8b and GXBB SoCs.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

diff --git a/Documentation/devicetree/bindings/pwm/pwm-meson.txt b/Documentation/devicetree/bindings/pwm/pwm-meson.txt
new file mode 100644 (file)
index 0000000..5376a44
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+++ b/Documentation/devicetree/bindings/pwm/pwm-meson.txt
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+Amlogic Meson PWM Controller
+============================
+
+Required properties:
+- compatible: Shall contain "amlogic,meson8b-pwm" or "amlogic,meson-gxbb-pwm".
+- #pwm-cells: Should be 3. See pwm.txt in this directory for a description of
+  the cells format.
+
+Optional properties:
+- clocks: Could contain one or two parents clocks phandle for each of the two
+  PWM channels.
+- clock-names: Could contain at least the "clkin0" and/or "clkin1" names.
+
+Example:
+
+       pwm_ab: pwm@8550 {
+               compatible = "amlogic,meson-gxbb-pwm";
+               reg = <0x0 0x08550 0x0 0x10>;
+               #pwm-cells = <3>;
+               status = "disabled";
+               clocks = <&xtal>, <&xtal>;
+               clock-names = "clkin0", "clkin1";
+       }