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diff --git a/Documentation/devicetree/bindings/mailbox/microchip,mpfs-mailbox.yaml b/Documentation/devicetree/bindings/mailbox/microchip,mpfs-mailbox.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/microchip,mpfs-mailbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip PolarFire SoC (MPFS) MSS (microprocessor subsystem) mailbox controller
+
+maintainers:
+  - Conor Dooley <conor.dooley@microchip.com>
+
+properties:
+  compatible:
+    const: microchip,mpfs-mailbox
+
+  reg:
+    oneOf:
+      - items:
+          - description: mailbox control & data registers
+          - description: mailbox interrupt registers
+        deprecated: true
+      - items:
+          - description: mailbox control registers
+          - description: mailbox interrupt registers
+          - description: mailbox data registers
+
+  interrupts:
+    maxItems: 1
+
+  "#mbox-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - "#mbox-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+      mbox: mailbox@37020000 {
+        compatible = "microchip,mpfs-mailbox";
+        reg = <0x0 0x37020000 0x0 0x58>, <0x0 0x2000318C 0x0 0x40>,
+              <0x0 0x37020800 0x0 0x100>;
+        interrupt-parent = <&L1>;
+        interrupts = <96>;
+        #mbox-cells = <1>;
+      };
+    };