diff options
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/interface.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index 9eb32ead63db..672b192f8153 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -1004,6 +1004,10 @@ int rtc_read_offset(struct rtc_device *rtc, long *offset) * to compensate for differences in the actual clock rate due to temperature, * the crystal, capacitor, etc. * + * The adjustment applied is as follows: + * t = t0 * (1 + offset * 1e-9) + * where t0 is the measured length of 1 RTC second with offset = 0 + * * Kernel interface to adjust an rtc clock offset. * Return 0 on success, or a negative number on error. * If the rtc offset is not setable (or not implemented), return -EINVAL |