dt-bindings: Add power-state dt-bindings

Add bindings of power-state device in yaml format.

Change-Id: I7abd870f0a0f46b5bf293f15d4215fff3e85e70f
Signed-off-by: Rajkumar Patel <quic_rajkpate@quicinc.com>

bindings/soc/qcom/qcom,power-state.yaml

@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/qcom/qcom,power-state.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Technologies, Inc. Power State Management Device
+
+maintainers:
+  - Maulik Shah <maulik.shah@oss.qualcomm.com>
+
+description: |
+  This binding describes the Qualcomm Technologies, Inc. Power State Management device.
+  This device helps with various Qualcomm SoC level Power state like deep sleep and
+  hibernation and user space management for subsystem and SoC low power states.
+
+properties:
+  compatible:
+    const: qcom,power-state
+
+  qcom,subsys-name:
+    description: subsystem names supported
+
+  qcom,rproc-handle:
+    description: phandle to subsys defined in subsys-name.
+
+required:
+  - compatible
+  - qcom,subsys-name
+  - qcom,rproc-handle
+
+additionalProperties: false
+
+examples:
+  - |
+    qcom,power-state {
+        compatible = "qcom,power-state";
+        qcom,subsys-name = "adsp", "modem";
+        qcom,rproc-handle = <&adsp_pas>, <&modem_pas>;
+    };
+...