| # 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>; |
| }; |
| |
