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ptp: introduce PTP_CLOCK_EXTOFF event for the measured external offset

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This change is for the PHC devices that can measure the phase offset
between PHC signal and the external signal, such as the 1PPS signal of
GNSS. Reporting PTP_CLOCK_EXTOFF to user space will be piggy-backed to
the existing ptp_extts_event so that application such as ts2phc can
poll the external offset the same way as extts. Hence, ts2phc can use
the offset to achieve the alignment between PHC and the external signal
by the help of either SW or HW filters.

Signed-off-by: Min Li <min.li.xe@renesas.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Min Li
2024-01-24 13:49:46 -05:00
committed by David S. Miller
parent cf8e51ef51
commit ea1cc3ee34
3 changed files with 28 additions and 4 deletions
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drivers/ptp/ptp_clock.c
+15 -1
View File
@@ -44,18 +44,31 @@ static void enqueue_external_timestamp(struct timestamp_event_queue *queue,
struct ptp_clock_event *src)
{
struct ptp_extts_event *dst;
struct timespec64 offset_ts;
unsigned long flags;
s64 seconds;
u32 remainder;
seconds = div_u64_rem(src->timestamp, 1000000000, &remainder);
if (src->type == PTP_CLOCK_EXTTS) {
seconds = div_u64_rem(src->timestamp, 1000000000, &remainder);
} else if (src->type == PTP_CLOCK_EXTOFF) {
offset_ts = ns_to_timespec64(src->offset);
seconds = offset_ts.tv_sec;
remainder = offset_ts.tv_nsec;
} else {
WARN(1, "%s: unknown type %d\n", __func__, src->type);
return;
}
spin_lock_irqsave(&queue->lock, flags);
dst = &queue->buf[queue->tail];
dst->index = src->index;
dst->flags = PTP_EXTTS_EVENT_VALID;
dst->t.sec = seconds;
dst->t.nsec = remainder;
if (src->type == PTP_CLOCK_EXTOFF)
dst->flags |= PTP_EXT_OFFSET;
/* Both WRITE_ONCE() are paired with READ_ONCE() in queue_cnt() */
if (!queue_free(queue))
@@ -417,6 +430,7 @@ void ptp_clock_event(struct ptp_clock *ptp, struct ptp_clock_event *event)
break;
case PTP_CLOCK_EXTTS:
case PTP_CLOCK_EXTOFF:
/* Enqueue timestamp on selected queues */
spin_lock_irqsave(&ptp->tsevqs_lock, flags);
list_for_each_entry(tsevq, &ptp->tsevqs, qlist) {