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