# 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 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>; };