uart_phyp_intr
NULL, uart_phyp_intr, sc, &sc->sc_icookie);
callout_reset(&sc->callout, sc->polltime, uart_phyp_intr, sc);
callout_reset(&sc->callout, sc->polltime, uart_phyp_intr, sc);
static void uart_phyp_intr(void *v);