| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) |
| 2 | # Copyright 2019 BayLibre, SAS |
| 3 | %YAML 1.2 |
| 4 | --- |
| 5 | $id: http://devicetree.org/schemas/mailbox/amlogic,meson-gxbb-mhu.yaml# |
| 6 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 7 | |
| 8 | title: Amlogic Meson Message-Handling-Unit Controller |
| 9 | |
| 10 | maintainers: |
| 11 | - Neil Armstrong <neil.armstrong@linaro.org> |
| 12 | |
| 13 | description: | |
| 14 | The Amlogic's Meson SoCs Message-Handling-Unit (MHU) is a mailbox controller |
| 15 | that has 3 independent channels/links to communicate with remote processor(s). |
| 16 | MHU links are hardwired on a platform. A link raises interrupt for any |
| 17 | received data. However, there is no specified way of knowing if the sent |
| 18 | data has been read by the remote. This driver assumes the sender polls |
| 19 | STAT register and the remote clears it after having read the data. |
| 20 | |
| 21 | properties: |
| 22 | compatible: |
| 23 | enum: |
| 24 | - amlogic,meson-gxbb-mhu |
| 25 | |
| 26 | reg: |
| 27 | maxItems: 1 |
| 28 | |
| 29 | interrupts: |
| 30 | minItems: 3 |
| 31 | description: |
| 32 | Contains the interrupt information corresponding to each of the 3 links |
| 33 | of MHU. |
| 34 | |
| 35 | "#mbox-cells": |
| 36 | const: 1 |
| 37 | |
| 38 | required: |
| 39 | - compatible |
| 40 | - reg |
| 41 | - interrupts |
| 42 | - "#mbox-cells" |
| 43 | |
| 44 | additionalProperties: false |
| 45 | |
| 46 | examples: |
| 47 | - | |
| 48 | mailbox@c883c404 { |
| 49 | compatible = "amlogic,meson-gxbb-mhu"; |
| 50 | reg = <0xc883c404 0x4c>; |
| 51 | interrupts = <208>, <209>, <210>; |
| 52 | #mbox-cells = <1>; |
| 53 | }; |