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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"
examples:
- |
mailbox@c883c404 {
compatible = "amlogic,meson-gxbb-mhu";
reg = <0xc883c404 0x4c>;
interrupts = <208>, <209>, <210>;
#mbox-cells = <1>;
};
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