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pps/ptp: Allow PHC devices to adjust PPS events for known delay

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Initial version by Stuart Hodgson <[email protected]>

Some PHC device drivers may deliver PPS events with a significant
and variable delay, but still be able to measure precisely what
that delay is.

Add a pps_sub_ts() function for subtracting a delay from the
timestamp(s) in a PPS event, and a PTP event type (PTP_CLOCK_PPSUSR)
for which the caller provides a complete PPS event.

Signed-off-by: Ben Hutchings <[email protected]>
This commit is contained in:
Ben Hutchings 2012-09-03 11:34:58 +01:00
commit 220a60a425
3 changed files with 22 additions and 2 deletions
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5
drivers/ptp/ptp_clock.c
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@ -300,6 +300,11 @@ void ptp_clock_event(struct ptp_clock *ptp, struct ptp_clock_event *event)
pps_get_ts(&evt);
pps_event(ptp->pps_source, &evt, PTP_PPS_EVENT, NULL);
break;
case PTP_CLOCK_PPSUSR:
pps_event(ptp->pps_source, &event->pps_times,
PTP_PPS_EVENT, NULL);
break;
}
}
EXPORT_SYMBOL(ptp_clock_event);