dt-bindings: hwmon: max20730: adding device tree doc for max20730

max20730 Integrated, Step-Down Switching Regulator with PMBus

Signed-off-by: Chu Lin <linchuyuan@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201004031445.2321090-2-linchuyuan@google.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/Documentation/devicetree/bindings/hwmon/maxim,max20730.yaml b/Documentation/devicetree/bindings/hwmon/maxim,max20730.yaml
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+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+
+$id: http://devicetree.org/schemas/hwmon/maxim,max20730.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim max20730
+
+maintainers:
+  - Jean Delvare <jdelvare@suse.com>
+  - Guenter Roeck <linux@roeck-us.net>
+
+description: |
+  The MAX20730 is a fully integrated, highly efficient switching regulator
+  with PMBus for applications operating from 4.5V to 16V and requiring
+  up to 25A (max) load. This single-chip regulator provides extremely
+  compact, high efficiency power-delivery solutions with high-precision
+  output voltages and excellent transient response.
+
+  Datasheets:
+    https://datasheets.maximintegrated.com/en/ds/MAX20730.pdf
+    https://datasheets.maximintegrated.com/en/ds/MAX20734.pdf
+    https://datasheets.maximintegrated.com/en/ds/MAX20743.pdf
+
+properties:
+  compatible:
+    enum:
+      - maxim,max20730
+      - maxim,max20734
+      - maxim,max20743
+
+  reg:
+    maxItems: 1
+
+  vout-voltage-divider:
+    description: |
+      If voltage divider present at vout, the voltage at voltage sensor pin
+      will be scaled. The properties will convert the raw reading to a more
+      meaningful number if voltage divider present. It has two numbers,
+      the first number is the output resistor, the second number is the total
+      resistance. Therefore, the adjusted vout is equal to
+      Vout = Vout * output_resistance / total resistance.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 2
+    maxItems: 2
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      max20730@10 {
+        compatible = "maxim,max20730";
+        reg = <0x10>;
+        vout-voltage-divider = <1000 2000>; // vout would be scaled to 0.5
+      };
+    };