[ 3.5.y.z extended stable ] Patch "ptp: update adjfreq callback description" has been added to staging queue

Herton Ronaldo Krzesinski herton.krzesinski at canonical.com
Thu Dec 6 03:23:44 UTC 2012

This is a note to let you know that I have just added a patch titled

    ptp: update adjfreq callback description

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



>From a28d82ee45f3685e5eb162253cb6b9877551109c Mon Sep 17 00:00:00 2001
From: Jacob Keller <jacob.e.keller at intel.com>
Date: Thu, 1 Nov 2012 12:30:16 +0000
Subject: [PATCH] ptp: update adjfreq callback description
X-Extended-Stable: 3.5

commit 87f4d7c1d36f44b0822053b7e5dedc31fdd0ab99 upstream.

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 at intel.com>
CC: Richard Cochran <richard.cochran at gmail.com>
CC: John Stultz <john.stultz at linaro.org>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher at intel.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.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 945704c..00b9e61 100644
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -50,7 +50,8 @@ 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.

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