hwmon: Add DT bindings schema for PVT controller

PVT controller (MR75203) is used to configure & control
Moortec embedded analog IP which contains temprature sensor(TS),
voltage monitor(VM) & process detector(PD) modules.

Add DT bindings schema for PVT controller.
Signed-off-by: Rahul Tanwar <rahul.tanwar@linux.intel.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/b540b49ca47d75c5f716f8a4e4eed0664a1116bf.1601889876.git.rahul.tanwar@linux.intel.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/moortec,mr75203.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Moortec Semiconductor MR75203 PVT Controller bindings
+
+maintainers:
+  - Rahul Tanwar <rtanwar@maxlinear.com>
+
+properties:
+  compatible:
+    const: moortec,mr75203
+
+  reg:
+    items:
+      - description: PVT common registers
+      - description: PVT temprature sensor registers
+      - description: PVT process detector registers
+      - description: PVT voltage monitor registers
+
+  reg-names:
+    items:
+      - const: common
+      - const: ts
+      - const: pd
+      - const: vm
+
+  intel,vm-map:
+    description:
+      PVT controller has 5 VM (voltage monitor) sensors.
+      vm-map defines CPU core to VM instance mapping. A
+      value of 0xff means that VM sensor is unused.
+    $ref: /schemas/types.yaml#definitions/uint8-array
+    maxItems: 5
+
+  clocks:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  "#thermal-sensor-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - intel,vm-map
+  - clocks
+  - resets
+  - "#thermal-sensor-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    pvt: pvt@e0680000 {
+        compatible = "moortec,mr75203";
+        reg = <0xe0680000 0x80>,
+              <0xe0680080 0x180>,
+              <0xe0680200 0x200>,
+              <0xe0680400 0xc00>;
+        reg-names = "common", "ts", "pd", "vm";
+        intel,vm-map = [03 01 04 ff ff];
+        clocks = <&osc0>;
+        resets = <&rcu0 0x40 7>;
+        #thermal-sensor-cells = <1>;
+    };