MTK_UART_SAMPLE_POINT 353 drivers/tty/serial/8250/8250_mtk.c serial_port_out(port, MTK_UART_SAMPLE_POINT, MTK_UART_SAMPLE_POINT 365 drivers/tty/serial/8250/8250_mtk.c serial_port_out(port, MTK_UART_SAMPLE_POINT, 0xff);