[PATCH 1/7] dt-bindings: mfd: add binding for qnap,mcu devices

[Heiko Stuebner]

These MCUs can be found in network attached storage devices made by QNAP.
They are connected to a serial port of the host device and provide
functionality like LEDs, power-control and temperature monitoring.

Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx>
---
 .../devicetree/bindings/mfd/qnap,mcu.yaml     | 43 +++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/qnap,mcu.yaml

diff --git a/Documentation/devicetree/bindings/mfd/qnap,mcu.yaml b/Documentation/devicetree/bindings/mfd/qnap,mcu.yaml
new file mode 100644
index 0000000000000..3b1ad8cb54da3
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/qnap,mcu.yaml
@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/qnap,mcu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: QNAP NAS on-board Microcontroller
+
+maintainers:
+  - Heiko Stuebner <heiko@xxxxxxxxx>
+
+description: |
+  QNAP embeds a microcontroller on their NAS devices adding system feature
+  as PWM Fan control, additional LEDs, power button status and more.
+
+properties:
+  compatible:
+    enum:
+      - qnap,ts433-mcu
+
+  "#cooling-cells":
+    const: 2
+
+  cooling-levels:
+    description: PWM duty cycle values corresponding to thermal cooling states.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    items:
+      maximum: 255
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    uart {
+      mcu {
+        compatible = "qnap,ts433-mcu";
+        #cooling-cells = <2>;
+        cooling-levels = <0 64 89 128 166 204 221 238>;
+      };
+    };
-- 
2.39.2