dt-bindings: snapshot of cluster device documentation

cluster device doumentation snapshot taken from qcom-6.1 branch
commit 040e6d35b731 ("dt-bindings: Add documentation for cluster
device").

Updates:
    - Rewritten in YAML format.

Change-Id: I765a50dce03fa7ecdf2c0ba9ace7bbf671102017
Signed-off-by: Rashid Zafar <quic_rzafar@quicinc.com>

bindings/arm/msm/qcom,lpm-cluster-dev.yaml

@@ -0,0 +1,36 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/msm/qcom,lpm-cluster-dev.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Technologies, Inc. Low Power Management Cluster Device
+
+description: |
+  The application processor can do a variety of cluster level low power modes.
+  It does so by predicting the low power mode based on latency and residency
+  information of various CPUs and clusters.
+
+  To make cluster low power mode decision, cluster device use the different prediction
+  algorithms so that chosen the particular low power mode more efficiently.
+
+properties:
+  compatible:
+    const: qcom,lpm-cluster-dev
+
+  power-domains:
+    maxItems: 1
+
+required:
+  - compatible
+  - power-domains
+
+additionalProperties: false
+
+examples:
+  - |
+
+    cluster-device {
+      compatible =  "qcom,lpm-cluster-dev";
+      power-domains = <&CLUSTER_PD>;
+    };