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+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2019 BayLibre, SAS
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/mailbox/amlogic,meson-gxbb-mhu.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Amlogic Meson Message-Handling-Unit Controller
+
+maintainers:
+ - Neil Armstrong <narmstrong@baylibre.com>
+
+description: |
+ The Amlogic's Meson SoCs Message-Handling-Unit (MHU) is a mailbox controller
+ that has 3 independent channels/links to communicate with remote processor(s).
+ MHU links are hardwired on a platform. A link raises interrupt for any
+ received data. However, there is no specified way of knowing if the sent
+ data has been read by the remote. This driver assumes the sender polls
+ STAT register and the remote clears it after having read the data.
+
+properties:
+ compatible:
+ enum:
+ - amlogic,meson-gxbb-mhu
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ minItems: 3
+ description:
+ Contains the interrupt information corresponding to each of the 3 links
+ of MHU.
+
+ "#mbox-cells":
+ const: 1
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - "#mbox-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ mailbox@c883c404 {
+ compatible = "amlogic,meson-gxbb-mhu";
+ reg = <0xc883c404 0x4c>;
+ interrupts = <208>, <209>, <210>;
+ #mbox-cells = <1>;
+ };
+