[PATCH v3 3/4] dt-bindings: hwmon: Add binding for max6639

[Marcello Sylvester Bauer <sylv@sylv.io>]

Add Devicetree binding documentation for Maxim MAX6639 temperature
monitor with PWM fan-speed controller.

The devicetree documentation for the SD3078 device tree.

Signed-off-by: Marcello Sylvester Bauer <sylv@sylv.io>
---
 .../bindings/hwmon/maxim,max6639.yaml         | 112 ++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml b/Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml
new file mode 100644
index 000000000000..7093cbeba44b
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml
@@ -0,0 +1,112 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+
+$id: http://devicetree.org/schemas/hwmon/maxim,max6639.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim max6639
+
+maintainers:
+  - Roland Stigge <stigge@antcom.de>
+
+description: |
+  The MAX6639 is a 2-channel temperature monitor with dual, automatic, PWM
+  fan-speed controller.  It monitors its own temperature and one external
+  diode-connected transistor or the temperatures of two external diode-connected
+  transistors, typically available in CPUs, FPGAs, or GPUs.
+
+  Datasheets:
+    https://datasheets.maximintegrated.com/en/ds/MAX6639-MAX6639F.pdf
+
+properties:
+  compatible:
+    enum:
+      - maxim,max6639
+
+  reg:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - "channel@0"
+  - "channel@1"
+
+additionalProperties: false
+
+patternProperties:
+  "^channel@[0-1]$":
+    type: object
+    description: |
+      Represents the two fans and their specific configuration.
+
+    properties:
+      reg:
+        description: |
+          The fan number.
+        items:
+          minimum: 0
+          maximum: 1
+
+      pwm-polarity:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        enum: [0, 1]
+        description:
+          PWM output is low at 100% duty cycle when this bit is set to zero. PWM
+          output is high at 100% duty cycle when this bit is set to 1.
+
+      pulses-per-revolution:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        enum: [1, 2, 3, 4]
+        description:
+          Value specifying the number of pulses per revolution of the controlled
+          FAN.
+
+      rpm-range:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        enum: [2000, 4000, 8000, 16000]
+        description:
+          Scales the tachometer counter by setting the maximum (full-scale) value
+          of the RPM range.
+
+    required:
+      - reg
+      - pwm-polarity
+      - pulses-per-revolution
+      - rpm-range
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      max6639@10 {
+        compatible = "maxim,max6639";
+        reg = <0x10>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        channel@0 {
+          reg = <0x0>;
+          pwm-polarity = <1>;
+          pulses-per-revolution = <2>;
+          rpm-range = <4000>;
+        };
+
+        channel@1 {
+          reg = <0x1>;
+          pwm-polarity = <1>;
+          pulses-per-revolution = <2>;
+          rpm-range = <4000>;
+        };
+      };
+    };
+...
-- 
2.33.1