87 lines
2.4 KiB
YAML
87 lines
2.4 KiB
YAML
|
# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
|
||
|
|
%YAML 1.2
|
||
|
|
---
|
||
|
|
$id: http://devicetree.org/schemas/mailbox/apple,mailbox.yaml#
|
||
|
|
$schema: http://devicetree.org/meta-schemas/core.yaml#
|
||
|
|
|
||
|
|
title: Apple Mailbox Controller
|
||
|
|
|
||
|
|
maintainers:
|
||
|
|
- Hector Martin <marcan@marcan.st>
|
||
|
|
- Sven Peter <sven@svenpeter.dev>
|
||
|
|
|
||
|
|
description:
|
||
|
|
The Apple mailbox consists of two FIFOs used to exchange 64+32 bit
|
||
|
|
messages between the main CPU and a co-processor. Multiple instances
|
||
|
|
of this mailbox can be found on Apple SoCs.
|
||
|
|
One of the two FIFOs is used to send data to a co-processor while the other
|
||
|
|
FIFO is used for the other direction.
|
||
|
|
Various clients implement different IPC protocols based on these simple
|
||
|
|
messages and shared memory buffers.
|
||
|
|
|
||
|
|
properties:
|
||
|
|
compatible:
|
||
|
|
oneOf:
|
||
|
|
- description:
|
||
|
|
ASC mailboxes are the most common variant found on the M1 used
|
||
|
|
for example for the display controller, the system management
|
||
|
|
controller and the NVMe coprocessor.
|
||
|
|
items:
|
||
|
|
- enum:
|
||
|
|
- apple,t8103-asc-mailbox
|
||
|
|
- apple,t6000-asc-mailbox
|
||
|
|
- const: apple,asc-mailbox-v4
|
||
|
|
|
||
|
|
- description:
|
||
|
|
M3 mailboxes are an older variant with a slightly different MMIO
|
||
|
|
interface still found on the M1. It is used for the Thunderbolt
|
||
|
|
co-processors.
|
||
|
|
items:
|
||
|
|
- enum:
|
||
|
|
- apple,t8103-m3-mailbox
|
||
|
|
- apple,t6000-m3-mailbox
|
||
|
|
- const: apple,m3-mailbox-v2
|
||
|
|
|
||
|
|
reg:
|
||
|
|
maxItems: 1
|
||
|
|
|
||
|
|
interrupts:
|
||
|
|
items:
|
||
|
|
- description: send fifo is empty interrupt
|
||
|
|
- description: send fifo is not empty interrupt
|
||
|
|
- description: receive fifo is empty interrupt
|
||
|
|
- description: receive fifo is not empty interrupt
|
||
|
|
|
||
|
|
interrupt-names:
|
||
|
|
items:
|
||
|
|
- const: send-empty
|
||
|
|
- const: send-not-empty
|
||
|
|
- const: recv-empty
|
||
|
|
- const: recv-not-empty
|
||
|
|
|
||
|
|
"#mbox-cells":
|
||
|
|
const: 0
|
||
|
|
|
||
|
|
power-domains:
|
||
|
|
maxItems: 1
|
||
|
|
|
||
|
|
required:
|
||
|
|
- compatible
|
||
|
|
- reg
|
||
|
|
- interrupts
|
||
|
|
- interrupt-names
|
||
|
|
- "#mbox-cells"
|
||
|
|
|
||
|
|
additionalProperties: false
|
||
|
|
|
||
|
|
examples:
|
||
|
|
- |
|
||
|
|
mailbox@77408000 {
|
||
|
|
compatible = "apple,t8103-asc-mailbox", "apple,asc-mailbox-v4";
|
||
|
|
reg = <0x77408000 0x4000>;
|
||
|
|
interrupts = <1 583 4>, <1 584 4>, <1 585 4>, <1 586 4>;
|
||
|
|
interrupt-names = "send-empty", "send-not-empty",
|
||
|
|
"recv-empty", "recv-not-empty";
|
||
|
|
#mbox-cells = <0>;
|
||
|
|
};
|