: Typically used for serial ports (RS-232, RS-422, or RS-485) and sometimes parallel ports. Common Use Cases

static void xr16c950_stop_tx(struct uart_port *port)

16C95x Serial Port Driver for Pegatron - DriverIdentifier

if you need extreme low power or very simple 9600 bps-only systems (a basic 16550A suffices).

Before examining the driver, one must understand the hardware enhancements over the 16550: