[RFC v4 1/4] dt-bindings: pwm: Add StarFive PWM module

[William Qiu]

Add documentation to describe StarFive Pulse Width Modulation
controller driver.

Signed-off-by: William Qiu <william.qiu at starfivetech.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski at linaro.org>
Reviewed-by: Hal Feng <hal.feng at starfivetech.com>
---
 .../bindings/pwm/starfive,jh7100-pwm.yaml     | 55 +++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/starfive,jh7100-pwm.yaml

diff --git a/Documentation/devicetree/bindings/pwm/starfive,jh7100-pwm.yaml b/Documentation/devicetree/bindings/pwm/starfive,jh7100-pwm.yaml
new file mode 100644
index 000000000000..6f1937beb962
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/starfive,jh7100-pwm.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/starfive,jh7100-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: StarFive JH7100 and JH7110 PWM controller
+
+maintainers:
+  - William Qiu <william.qiu at starfivetech.com>
+
+description:
+  StarFive SoCs contain PWM and when operating in PWM mode, the PTC core generates
+  binary signal with user-programmable low and high periods. Clock source for the
+  PWM can be either system clock or external clock. Each PWM timer block provides 8
+  PWM channels.
+
+allOf:
+  - $ref: pwm.yaml#
+
+properties:
+  compatible:
+    enum:
+      - starfive,jh7100-pwm
+      - starfive,jh7110-pwm
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  "#pwm-cells":
+    const: 3
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    pwm at 12490000 {
+        compatible = "starfive,jh7100-pwm";
+        reg = <0x12490000 0x10000>;
+        clocks = <&clkgen 181>;
+        resets = <&rstgen 109>;
+        #pwm-cells = <3>;
+    };
--
2.34.1