tty_register_device
tty_register_device(tty3270_driver, minor - RAW3270_FIRSTMINOR, NULL);
dev = tty_register_device(gsm_tty_driver, base + i, NULL);
EXPORT_SYMBOL(tty_register_device);
d = tty_register_device(driver, i, NULL);
dev = tty_register_device(vcc_tty_driver, port->index, &vdev->dev);
struct device *tty_register_device(struct tty_driver *driver, unsigned index,