diff --git a/drivers/ptp/ptp_qoriq.c b/drivers/ptp/ptp_qoriq.c
index 76272e5ac5b8..bcd29104effe 100644
--- a/drivers/ptp/ptp_qoriq.c
+++ b/drivers/ptp/ptp_qoriq.c
@@ -355,6 +355,7 @@ static const struct ptp_clock_info ptp_qoriq_caps = {
 	.n_per_out	= 0,
 	.n_pins		= 0,
 	.pps		= 1,
+	.supported_extts_flags = PTP_RISING_EDGE | PTP_STRICT_FLAGS,
 	.adjfine	= ptp_qoriq_adjfine,
 	.adjtime	= ptp_qoriq_adjtime,
 	.gettime64	= ptp_qoriq_gettime,