| What: /sys/class/rtc/rtc0/device/rtc_calibration | |
| Date: Oct 2011 | |
| KernelVersion: 3.0 | |
| Contact: Mark Godfrey <mark.godfrey@stericsson.com> | |
| Description: Attribute for calibrating ST-Ericsson AB8500 Real Time Clock | |
| 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. |