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

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  1 What:           /sys/class/rtc/rtc0/device/rtc_calibration
  2 Date:           Oct 2011
  3 KernelVersion:  3.0
  4 Contact:        Mark Godfrey <mark.godfrey@stericsson.com>
  5 Description:    Attribute for calibrating ST-Ericsson AB8500 Real Time Clock
  6                 The rtc_calibration attribute allows the userspace to
  7                 calibrate the AB8500.s 32KHz Real Time Clock.
  8                 Every 60 seconds the AB8500 will correct the RTC's value
  9                 by adding to it the value of this attribute.
 10 
 11                 The range of the attribute is -127 to +127 in units of
 12                 30.5 micro-seconds (half-parts-per-million of the 32KHz clock)
 13 Users:          The /vendor/st-ericsson/base_utilities/core/rtc_calibration
 14                 daemon uses this interface.
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