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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (c) 2020 Intel Corporation
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/mailbox/intel,keembay-scmi-mailbox.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Intel Keem Bay SCMI mailbox
+
+maintainers:
+ - Paul Murphy <paul.j.murphy@intel.com>
+
+description: |
+ The Intel Keem Bay SCMI mailbox is used to communicate SCMI messages to the
+ runtime service in BL31 behaving as the SCMI 'SCP'.
+ Refer to ./mailbox.txt for generic information about mailbox device-tree
+ bindings.
+ For more information about SCMI, refer to the bindings described in
+ Documentation/devicetree/bindings/arm/arm,scmi.txt
+
+properties:
+ compatible:
+ enum:
+ - intel,keembay-scmi-mailbox
+
+ "#mbox-cells":
+ const: 1
+
+ memory-region:
+ description:
+ Memory region describing the SCMI shared memory
+
+required:
+ - compatible
+ - "#mbox-cells"
+ - memory-region
+
+examples:
+ - |
+ scmi_mailbox: scmi_mailbox {
+ compatible = "intel,keembay-scmi-mailbox";
+ #mbox-cells = <1>;
+ memory-region = <&scmi_sec_shmem>;
+ };