timecounter: provide a helper function to shift the time.

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Some PTP Hardware Clock drivers use a struct timecounter to represent
their clock. To adjust the time by a given offset, these drivers all
perform a two step read/write of their timecounter. However, it is
better and simpler just to adjust the offset in one step. This patch
introduces a little routine to help drivers implement the adjtime
method.

Suggested-by: Janusz Użycki <j.uzycki@elproma.com.pl>
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Richard Cochran 2014-12-21 19:46:57 +01:00 • committed by David S. Miller

parent 74d23cc704

commit 796c1efd6f

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include/linux/timecounter.h

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