1What: /sys/class/rtc/rtc0/device/rtc_calibration 2Date: Oct 2011 3KernelVersion: 3.0 4Contact: Mark Godfrey <mark.godfrey@stericsson.com> 5Description: 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) 13Users: The /vendor/st-ericsson/base_utilities/core/rtc_calibration 14 daemon uses this interface. 15