ptp_find_pin_unlocked
pin = ptp_find_pin_unlocked(phc->clock, PTP_PF_EXTTS, 0);
cal_gpio = 1 + ptp_find_pin_unlocked(clock->ptp_clock, PTP_PF_PHYSYNC, 0);
pin = ptp_find_pin_unlocked(ptp_priv->ptp_clock, PTP_PF_EXTTS, 0);
EXPORT_SYMBOL(ptp_find_pin_unlocked);
int ptp_find_pin_unlocked(struct ptp_clock *ptp,