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# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/serial/nvidia,tegra194-tcu.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: NVIDIA Tegra Combined UART (TCU)
maintainers:
- Thierry Reding <thierry.reding@gmail.com>
- Jonathan Hunter <jonathanh@nvidia.com>
description:
The TCU is a system for sharing a hardware UART instance among multiple
systems within the Tegra SoC. It is implemented through a mailbox-
based protocol where each "virtual UART" has a pair of mailboxes, one
for transmitting and one for receiving, that is used to communicate
with the hardware implementing the TCU.
properties:
$nodename:
pattern: "^serial(@.*)?$"
compatible:
oneOf:
- const: nvidia,tegra194-tcu
- items:
- enum:
- nvidia,tegra234-tcu
- const: nvidia,tegra194-tcu
mbox-names:
items:
- const: rx
- const: tx
mboxes:
description: |
List of phandles to mailbox channels used for receiving and
transmitting data from and to the hardware UART.
items:
- description: mailbox for receiving data from hardware UART
- description: mailbox for transmitting data to hardware UART
required:
- compatible
- mbox-names
- mboxes
additionalProperties: false
examples:
- |
#include <dt-bindings/mailbox/tegra186-hsp.h>
tcu: serial {
compatible = "nvidia,tegra194-tcu";
mboxes = <&hsp_top0 TEGRA_HSP_MBOX_TYPE_SM 0>,
<&hsp_aon TEGRA_HSP_MBOX_TYPE_SM 1>;
mbox-names = "rx", "tx";
};
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