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The rtc_calibration attribute allows user-space to get and set the AB8500's RtcCalibration register. The AB8500 will then use the value in this register to compensate for RTC drift every 60 seconds. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Mark Godfrey <mark.godfrey@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 lines
717 B
Text
12 lines
717 B
Text
What: Attribute for calibrating ST-Ericsson AB8500 Real Time Clock
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Date: Oct 2011
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KernelVersion: 3.0
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Contact: Mark Godfrey <mark.godfrey@stericsson.com>
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Description: The rtc_calibration attribute allows the userspace to
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calibrate the AB8500.s 32KHz Real Time Clock.
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Every 60 seconds the AB8500 will correct the RTC's value
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by adding to it the value of this attribute.
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The range of the attribute is -127 to +127 in units of
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30.5 micro-seconds (half-parts-per-million of the 32KHz clock)
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Users: The /vendor/st-ericsson/base_utilities/core/rtc_calibration
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daemon uses this interface.
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