NVIDIA Tegra Combined UART

modulename: tegra-tcu.ko

configname: CONFIG_SERIAL_TEGRA_TCU

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Serial drivers
└─>NVIDIA Tegra Combined UART
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Support for the mailbox-based TCU (Tegra Combined UART) serial port.
TCU is a virtual serial port that allows multiplexing multiple data
streams into a single hardware serial port.

source code:
drivers/tty/serial/tegra-tcu.c