MTK_UART_HIGHS    328 drivers/tty/serial/8250/8250_mtk.c 		serial_port_out(port, MTK_UART_HIGHS, 0x0);
MTK_UART_HIGHS    331 drivers/tty/serial/8250/8250_mtk.c 		serial_port_out(port, MTK_UART_HIGHS, 0x3);