1 What: /sys/class/rtc/rtc0/device/rtc 1 What: /sys/class/rtc/rtc0/device/rtc_calibration
2 Date: Oct 2011 2 Date: Oct 2011
3 KernelVersion: 3.0 3 KernelVersion: 3.0
4 Contact: Mark Godfrey <mark.godfrey@ster 4 Contact: Mark Godfrey <mark.godfrey@stericsson.com>
5 Description: Attribute for calibrating ST-E 5 Description: Attribute for calibrating ST-Ericsson AB8500 Real Time Clock
6 The rtc_calibration attribute 6 The rtc_calibration attribute allows the userspace to
7 calibrate the AB8500.s 32KHz R 7 calibrate the AB8500.s 32KHz Real Time Clock.
8 Every 60 seconds the AB8500 wi 8 Every 60 seconds the AB8500 will correct the RTC's value
9 by adding to it the value of t 9 by adding to it the value of this attribute.
10 <<
11 The range of the attribute is 10 The range of the attribute is -127 to +127 in units of
12 30.5 micro-seconds (half-parts 11 30.5 micro-seconds (half-parts-per-million of the 32KHz clock)
13 Users: The /vendor/st-ericsson/base_u 12 Users: The /vendor/st-ericsson/base_utilities/core/rtc_calibration
14 daemon uses this interface. 13 daemon uses this interface.
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