| Mauro Carvalho Chehab | aaa6f6a | 2016-10-29 08:10:02 -0200 | [diff] [blame] | 1 | What: /sys/class/rtc/rtc0/device/rtc_calibration |
| Mark Godfrey | dda367a | 2012-01-10 15:10:42 -0800 | [diff] [blame] | 2 | Date: Oct 2011 |
| 3 | KernelVersion: 3.0 |
| 4 | Contact: Mark Godfrey <mark.godfrey@stericsson.com> |
| Mauro Carvalho Chehab | aaa6f6a | 2016-10-29 08:10:02 -0200 | [diff] [blame] | 5 | Description: Attribute for calibrating ST-Ericsson AB8500 Real Time Clock |
| 6 | The rtc_calibration attribute allows the userspace to |
| Mark Godfrey | dda367a | 2012-01-10 15:10:42 -0800 | [diff] [blame] | 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 | The range of the attribute is -127 to +127 in units of |
| 11 | 30.5 micro-seconds (half-parts-per-million of the 32KHz clock) |
| 12 | Users: The /vendor/st-ericsson/base_utilities/core/rtc_calibration |
| 13 | daemon uses this interface. |