1NVIDIA Tegra Combined UART (TCU) 2 3The TCU is a system for sharing a hardware UART instance among multiple 4systems within the Tegra SoC. It is implemented through a mailbox- 5based protocol where each "virtual UART" has a pair of mailboxes, one 6for transmitting and one for receiving, that is used to communicate 7with the hardware implementing the TCU. 8 9Required properties: 10- name : Should be tcu 11- compatible 12 Array of strings 13 One of: 14 - "nvidia,tegra194-tcu" 15- mbox-names: 16 "rx" - Mailbox for receiving data from hardware UART 17 "tx" - Mailbox for transmitting data to hardware UART 18- mboxes: Mailboxes corresponding to the mbox-names. 19 20This node is a mailbox consumer. See the following files for details of 21the mailbox subsystem, and the specifiers implemented by the relevant 22provider(s): 23 24- .../mailbox/mailbox.txt 25- .../mailbox/nvidia,tegra186-hsp.txt 26 27Example bindings: 28----------------- 29 30tcu: tcu { 31 compatible = "nvidia,tegra194-tcu"; 32 mboxes = <&hsp_top0 TEGRA_HSP_MBOX_TYPE_SM 0>, 33 <&hsp_aon TEGRA_HSP_MBOX_TYPE_SM 1>; 34 mbox-names = "rx", "tx"; 35}; 36