dt-bindings: thermal: Add LMH CPU voltage cooling device driver bindings

Add bindings for LMH CPU voltage cooling devices driver.

Change-Id: I726428978c6e8dc1b71ec754782bd60b3509dab9
Signed-off-by: Nitesh Kumar <quic_nitekuma@quicinc.com>

bindings/thermal/qti-lmh-cpu-vdd-cdev.yaml

@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/thermal/qti-lmh-cpu-vdd-cdev.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: QTI LMH CPU Voltage cooling devices.
+
+maintainers:
+  - Nitesh Kumar <quic_nitekuma@quicinc.com>
+
+description: |
+ The LMH CPU voltage cooling device will be used to place voltage restriction
+ vote on CPU railway during cold thermal condition. This cooling device driver
+ will register one cooling device per LLM, which can be used by thermal zone to
+ place voltage restriction vote.
+
+properties:
+  compatible:
+    const: qcom,lmh-cpu-vdd
+
+  reg:
+    maxItems: 1
+    description: |
+     <a b> where 'a' is the starting register address of the LLM
+     and 'b' is the size of LLM address space.
+
+  "#cooling-cells":
+    const: 2
+    description: |
+      Must be 2. Needed for of_thermal as cooling device
+      identifier. Please refer to <devicetree/bindings/thermal/thermal.txt> for more
+      details.
+
+required:
+  - compatible
+  - reg
+  - "#cooling-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    lmh_cpu_vdd0: qcom,lmh-cpu-vdd@18350800 {
+      compatible = "qcom,lmh-cpu-vdd";
+      reg =  <0x18350800 0x1000>;
+      #cooling-cells = <2>;
+    };