xref: /linux/Documentation/devicetree/bindings/serial/nvidia,tegra194-tcu.yaml (revision a4eb44a6435d6d8f9e642407a4a06f65eb90ca04) 
1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/serial/nvidia,tegra194-tcu.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: NVIDIA Tegra Combined UART (TCU)
8
9maintainers:
10  - Thierry Reding <thierry.reding@gmail.com>
11  - Jonathan Hunter <jonathanh@nvidia.com>
12
13description:
14  The TCU is a system for sharing a hardware UART instance among multiple
15  systems within the Tegra SoC. It is implemented through a mailbox-
16  based protocol where each "virtual UART" has a pair of mailboxes, one
17  for transmitting and one for receiving, that is used to communicate
18  with the hardware implementing the TCU.
19
20properties:
21  $nodename:
22    pattern: "^serial(@.*)?$"
23
24  compatible:
25    oneOf:
26      - const: nvidia,tegra194-tcu
27      - items:
28          - enum:
29              - nvidia,tegra234-tcu
30          - const: nvidia,tegra194-tcu
31
32  mbox-names:
33    items:
34      - const: rx
35      - const: tx
36
37  mboxes:
38    description: |
39      List of phandles to mailbox channels used for receiving and
40      transmitting data from and to the hardware UART.
41    items:
42      - description: mailbox for receiving data from hardware UART
43      - description: mailbox for transmitting data to hardware UART
44
45required:
46  - compatible
47  - mbox-names
48  - mboxes
49
50additionalProperties: false
51
52examples:
53  - |
54    #include <dt-bindings/mailbox/tegra186-hsp.h>
55
56    tcu: serial {
57        compatible = "nvidia,tegra194-tcu";
58        mboxes = <&hsp_top0 TEGRA_HSP_MBOX_TYPE_SM 0>,
59                 <&hsp_aon TEGRA_HSP_MBOX_TYPE_SM 1>;
60        mbox-names = "rx", "tx";
61    };
62