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| author | Joshua Clayton <stillcompiling@gmail.com> | 2016-02-05 12:41:12 -0800 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2016-03-14 17:08:16 +0100 |
| commit | 5495a4159f7413f0367e8c9727ba9facd40ade7f (patch) | |
| tree | 5bfdec7f3b6982a2c29c89762e8a20a50e579918 /Documentation/rtc.txt | |
| parent | b3967067c273359c7462f4be9a887c3d1a515f49 (diff) | |
| download | linux-5495a4159f7413f0367e8c9727ba9facd40ade7f.tar.gz linux-5495a4159f7413f0367e8c9727ba9facd40ade7f.tar.bz2 linux-5495a4159f7413f0367e8c9727ba9facd40ade7f.zip | |
rtc: implement a sysfs interface for clock offset
clock offset may be set and read in decimal parts per billion
attribute is /sys/class/rtc/rtcN/offset
The attribute is only visible for rtcs that have set_offset implemented.
Signed-off-by: Joshua Clayton <stillcompiling@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'Documentation/rtc.txt')
| -rw-r--r-- | Documentation/rtc.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/rtc.txt b/Documentation/rtc.txt index 8446f1ea1410..ddc366026e00 100644 --- a/Documentation/rtc.txt +++ b/Documentation/rtc.txt @@ -157,6 +157,12 @@ wakealarm: The time at which the clock will generate a system wakeup the epoch by default, or if there's a leading +, seconds in the future, or if there is a leading +=, seconds ahead of the current alarm. +offset: The amount which the rtc clock has been adjusted in firmware. + Visible only if the driver supports clock offset adjustment. + The unit is parts per billion, i.e. The number of clock ticks + which are added to or removed from the rtc's base clock per + billion ticks. A positive value makes a day pass more slowly, + longer, and a negative value makes a day pass more quickly. IOCTL INTERFACE --------------- |