summaryrefslogtreecommitdiffstats
path: root/kernel/Documentation/ABI/testing/sysfs-class-rtc-rtc0-device-rtc_calibration
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/Documentation/ABI/testing/sysfs-class-rtc-rtc0-device-rtc_calibration')
-rw-r--r--kernel/Documentation/ABI/testing/sysfs-class-rtc-rtc0-device-rtc_calibration12
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/Documentation/ABI/testing/sysfs-class-rtc-rtc0-device-rtc_calibration b/kernel/Documentation/ABI/testing/sysfs-class-rtc-rtc0-device-rtc_calibration
new file mode 100644
index 000000000..4cf1e7222
--- /dev/null
+++ b/kernel/Documentation/ABI/testing/sysfs-class-rtc-rtc0-device-rtc_calibration
@@ -0,0 +1,12 @@
+What: Attribute for calibrating ST-Ericsson AB8500 Real Time Clock
+Date: Oct 2011
+KernelVersion: 3.0
+Contact: Mark Godfrey <mark.godfrey@stericsson.com>
+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.