Documentation: devicetree: Add DT binding document for pex9749-thermal

Add device tree binding document for the thermal sensor pex9749.

bug 3587973

Change-Id: I0793854fd5a22cc2daa59408bb9adcb4aa78cade
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2701480
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>

Documentation/devicetree/bindings/thermal/pex9749-thermal.yaml

@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/thermal/pex9749-thermal.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: PEX9749 Thermal Sensor
+
+maintainers:
+  - Laxman Dewangan <ldewangan@nvidia.com>
+
+description: |
+  PEX9749 thermal sensor monitors the temperature.
+
+properties:
+  compatible:
+    const: "pex9749"
+
+  reg:
+    maxItems: 1
+
+  "#thermal-sensor-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - "#thermal-sensor-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+     i2c@3180000 {
+         pex9749: pex9749@5f {
+             compatible = "pex9749";
+             reg = <0x5f>;
+             #thermal-sensor-cells = <1>;
+         };
+     };