phc2sys: update '-s' option

Add description about bond interface.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>

diff --git a/phc2sys.8 b/phc2sys.8
index 2559c7442cf5189350b4a0fc9e40967bd07c1621..4fc4fa3ad69fb9d02374aa10d9166ba540eff831 100644 (file)
--- a/phc2sys.8
+++ b/phc2sys.8
@@ -94,7 +94,11 @@ together with the
 option, the master clock is used only to correct the offset by whole number of
 seconds, which cannot be fixed with PPS alone. Not compatible with the
 .B \-a
-option.
+option. This option does not support bonded interface (e.g. bond0). If
+.B ptp4l
+has a port on an active-backup bond interface, the
+.B \-a
+option can be used to track the active interface.
 .TP
 .BI \-i " interface"
 Performs the exact same function as