diff options
| author |   Alexander Gordeev <lasaine@lvk.cs.msu.su> | 2011-01-12 17:00:57 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 08:03:21 -0800 |
| commit | e2c18e49a0d4f822ffc29fb4958943beb1ff08b7 (patch) | |
| tree | 227dbb544277f7908fa1666ce21a15e6b2282ccb /include/linux/pps_kernel.h | |
| parent | ntp: add hardpps implementation (diff) | |
| download | linux-dev-e2c18e49a0d4f822ffc29fb4958943beb1ff08b7.tar.xz linux-dev-e2c18e49a0d4f822ffc29fb4958943beb1ff08b7.zip | |
pps: capture MONOTONIC_RAW timestamps as well
MONOTONIC_RAW clock timestamps are ideally suited for frequency
calculation and also fit well into the original NTP hardpps design. Now
phase and frequency can be adjusted separately: the former based on
REALTIME clock and the latter based on MONOTONIC_RAW clock.
A new function getnstime_raw_and_real is added to timekeeping subsystem to
capture both timestamps at the same time and atomically.
Signed-off-by: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Acked-by: John Stultz <johnstul@us.ibm.com>
Cc: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/pps_kernel.h')
| -rw-r--r-- | include/linux/pps_kernel.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/pps_kernel.h b/include/linux/pps_kernel.h index 1aedf50088cf..94048547f29a 100644 --- a/include/linux/pps_kernel.h +++ b/include/linux/pps_kernel.h @@ -47,6 +47,9 @@ struct pps_source_info { }; struct pps_event_time { +#ifdef CONFIG_NTP_PPS + struct timespec ts_raw; +#endif /* CONFIG_NTP_PPS */ struct timespec ts_real; }; @@ -97,10 +100,21 @@ static inline void timespec_to_pps_ktime(struct pps_ktime *kt, kt->nsec = ts.tv_nsec; } +#ifdef CONFIG_NTP_PPS + +static inline void pps_get_ts(struct pps_event_time *ts) +{ + getnstime_raw_and_real(&ts->ts_raw, &ts->ts_real); +} + +#else /* CONFIG_NTP_PPS */ + static inline void pps_get_ts(struct pps_event_time *ts) { getnstimeofday(&ts->ts_real); } +#endif /* CONFIG_NTP_PPS */ + #endif /* LINUX_PPS_KERNEL_H */ |