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Date:	Sat, 22 Sep 2012 09:42:56 +0200
From:	Richard Cochran <>
To:	<>
Cc:	Ben Hutchings <>,
	David Miller <>,
	Jacob Keller <>,
	Jeff Kirsher <>,
	John Stultz <>,
	Matthew Vick <>
Subject: [PATCH V2 net-next 4/4] ptp: clarify the clock_name sysfs attribute

There has been some confusion among PHC driver authors about the
intended purpose of the clock_name attribute. This patch expands the
documation in order to clarify how the clock_name field should be

Signed-off-by: Richard Cochran <>
 Documentation/ABI/testing/sysfs-ptp |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-ptp b/Documentation/ABI/testing/sysfs-ptp
index d40d2b5..c906488 100644
--- a/Documentation/ABI/testing/sysfs-ptp
+++ b/Documentation/ABI/testing/sysfs-ptp
@@ -19,7 +19,10 @@ Date:		September 2010
 Contact:	Richard Cochran <>
 		This file contains the name of the PTP hardware clock
-		as a human readable string.
+		as a human readable string. The purpose of this
+		attribute is to provide the user with a "friendly
+		name" and to help distinguish PHY based devices from
+		MAC based ones.
 What:		/sys/class/ptp/ptpN/max_adjustment
 Date:		September 2010

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