dt-bindings: hwmon: Add Sparx5 temperature sensor

This add the DT binding specification for the Sparx5 temperature
sensor.
Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200618135951.25441-2-lars.povlsen@microchip.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/hwmon/microchip,sparx5-temp.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/microchip,sparx5-temp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip Sparx5 Temperature Monitor
+
+maintainers:
+  - Lars Povlsen <lars.povlsen@microchip.com>
+
+description: |
+  Microchip Sparx5 embedded temperature monitor
+
+properties:
+  compatible:
+    enum:
+      - microchip,sparx5-temp
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: AHB reference clock
+
+  '#thermal-sensor-cells':
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    tmon0: tmon@610508110 {
+        compatible = "microchip,sparx5-temp";
+        reg = <0x10508110 0xc>;
+        #thermal-sensor-cells = <0>;
+        clocks = <&ahb_clk>;
+    };