1 What: /sys/class/rtc/rtc0/device/rtc_calibration
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.
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.