Documentation/ABI/testing/sysfs-class-rtc-rtc0-device-rtc_calibration

   1 What:           Attribute for calibrating ST-Ericsson AB8500 Real Time Clock
   2 Date:           Oct 2011
   3 KernelVersion:  3.0
   4 Contact:        Mark Godfrey <mark.godfrey@stericsson.com>
   5 Description:    The rtc_calibration attribute allows the userspace to
   6                 calibrate the AB8500.s 32KHz Real Time Clock.
   7                 Every 60 seconds the AB8500 will correct the RTC's value
   8                 by adding to it the value of this attribute.
   9                 The range of the attribute is -127 to +127 in units of
  10                 30.5 micro-seconds (half-parts-per-million of the 32KHz clock)
  11 Users:          The /vendor/st-ericsson/base_utilities/core/rtc_calibration
  12                 daemon uses this interface.