What: Attribute for calibrating ST-Ericsson AB8500 Real Time Clock Date: Oct 2011 KernelVersion: 3.0 Contact: Mark Godfrey Description: The rtc_calibration attribute allows the userspace to calibrate the AB8500.s 32KHz Real Time Clock. Every 60 seconds the AB8500 will correct the RTC's value by adding to it the value of this attribute. The range of the attribute is -127 to +127 in units of 30.5 micro-seconds (half-parts-per-million of the 32KHz clock) Users: The /vendor/st-ericsson/base_utilities/core/rtc_calibration daemon uses this interface.