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: NJacob 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: NJeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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