netdev - [net] ptp: update adjfreq callback description

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Date:	Thu,  1 Nov 2012 15:30:16 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Jacob Keller <jacob.e.keller@...el.com>, netdev@...r.kernel.org,
	gospo@...hat.com, sassmann@...hat.com, stable@...r.kernel.org,
	richard.cochran@...il.com, john.stultz@...aro.org,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net] ptp: update adjfreq callback description

From: Jacob Keller <jacob.e.keller@...el.com>

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@...el.com>
CC: stable@...r.kernel.org [v3.5+]
CC: Richard Cochran <richard.cochran@...il.com>
CC: John Stultz <john.stultz@...aro.org>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 include/linux/ptp_clock_kernel.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
index f2dc6d8..38a9935 100644
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -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.
-- 
1.7.11.7

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