tty_alloc
tp = tty_alloc(&cfe_ttydevsw, NULL);
tp = tty_alloc(&dcons_ttydevsw, dc);
tp = tty_alloc(&ofw_ttydevsw, NULL);
sysmouse_tty = tty_alloc(&smdev_ttydevsw, NULL);
sc->sc_u.u_tty.tp = tp = tty_alloc(&uart_tty_class, sc);
tp = tty_alloc(&xencons_ttydevsw, cons);
tp = tty_alloc(&terminal_tty_class, tm);
tp = tty_alloc(&pts_class, psc);
tp = tty_alloc(&pts_class, psc);
tp = tty_alloc(&mambo_ttydevsw, NULL);
sc->tp = tty_alloc(&uart_opal_tty_class, sc);
sc->tp = tty_alloc(&uart_phyp_tty_class, sc);
tp = tty_alloc(&riscv_ttydevsw, NULL);
struct tty *tty_alloc(struct ttydevsw *tsw, void *softc);