dt-bindings: memshare: Add devicetree bindings for memshare

Add documentation for memshare driver device tree bindings
aligning to new requirement.

Change-Id: I1da604c4c444044ac4c2dd25037d11900ebe8a79
Signed-off-by: Manoj Prabhu B <quic_bmanoj@quicinc.com>

bindings/arm/msm/qcom,memshare.yaml

@@ -0,0 +1,84 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/arm/msm/qcom,memshare.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: HLOS Memory Share Driver
+
+maintainers:
+  - Manoj Prabhu B <quic_bmanoj@quicinc.com>
+
+description: |
+  The Memshare driver implements a Kernel QMI service on the
+  APSS responsible for providing contiguous physical memory
+  to subsystems for use cases when additional memory is required.
+
+properties:
+  compatible:
+    const: qcom,memshare
+    description: Container of Memshare nodes
+
+  child-node:
+    description: Container of Memshare client nodes
+    type: object
+    properites:
+        compatible:
+            const: qcom,memshare-peripheral
+
+patternProperties:
+  '^qcom,[a-zA-Z]+$':
+    type: object
+    properties:
+      qcom,peripheral-size:
+        $ref: '/schemas/types.yaml#/definitions/uint32'
+        description: |
+            Indicates the size (in bytes) required for that child node
+
+      qcom,client-id:
+        $ref: '/schemas/types.yaml#/definitions/uint32'
+        description: |
+            Indicates the client id of the child node.
+
+      qcom,allocate-boot-time:
+        type: boolean
+        description: |
+            Indicates whether clients needs boot time memory allocation.
+
+      qcom,allocate-on-request:
+        type: boolean
+        description: |
+            Indicates memory allocation happens only upon client request.
+            qcom,allocate-boot-time and qcom,allocate-on-request are mutually exclusive rite now.
+
+      qcom,guard-band:
+        type: boolean
+        description: |
+          Indicates addition of a guard band memory allocation in addition to the client's memory region.
+
+      label:
+        $ref: '/schemas/types.yaml#/definitions/string'
+        description: |
+          Indicates the peripheral information for the node.
+
+    required:
+      - compatible
+      - qcom,peripheral-size
+      - qcom,client-id
+
+required:
+  - compatible
+
+examples:
+  - |
+    qcom,memshare {
+        compatible = "qcom,memshare";
+
+        qcom,client_1 {
+            compatible = "qcom,memshare-peripheral";
+            qcom,peripheral-size = <0x200000>;
+            qcom,client-id = <0>;
+            qcom,allocate-boot-time;
+            label = "modem";
+        };
+    };