0001 What: /sys/class/rtc/rtc0/device/rtc_calibration
0002 Date: Oct 2011
0003 KernelVersion: 3.0
0004 Contact: Mark Godfrey <mark.godfrey@stericsson.com>
0005 Description: Attribute for calibrating ST-Ericsson AB8500 Real Time Clock
0006 The rtc_calibration attribute allows the userspace to
0007 calibrate the AB8500.s 32KHz Real Time Clock.
0008 Every 60 seconds the AB8500 will correct the RTC's value
0009 by adding to it the value of this attribute.
0010
0011 The range of the attribute is -127 to +127 in units of
0012 30.5 micro-seconds (half-parts-per-million of the 32KHz clock)
0013 Users: The /vendor/st-ericsson/base_utilities/core/rtc_calibration
0014 daemon uses this interface.
