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ptp: update adjfreq callback description 

This patch updates the adjfreq callback description to include a note that the
delta in ppb is always relative to the base frequency, and not to the current
frequency of the hardware clock.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
CC: stable@vger.kernel.org [v3.5+]
CC: Richard Cochran <richard.cochran@gmail.com>
CC: John Stultz <john.stultz@linaro.org>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jacob Keller 2012-11-01 12:30:16 +00:00 committed by David S. Miller
parent 0481776b7a
commit 87f4d7c1d3
1 changed files with 2 additions and 1 deletions
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3
include/linux/ptp_clock_kernel.h
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@ -54,7 +54,8 @@ struct ptp_clock_request {
* clock operations
*
* @adjfreq: Adjusts the frequency of the hardware clock.
* parameter delta: Desired period change in parts per billion.
* parameter delta: Desired frequency offset from nominal frequency
* in parts per billion
*
* @adjtime: Shifts the time of the hardware clock.
* parameter delta: Desired change in nanoseconds.