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