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-rw-r--r--Documentation/networking/can.txt9
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/networking/can.txt b/Documentation/networking/can.txt
index 05fd83bb3596..6ab619fcc517 100644
--- a/Documentation/networking/can.txt
+++ b/Documentation/networking/can.txt
@@ -372,6 +372,15 @@ solution for a couple of reasons:
nbytes = sendto(s, &frame, sizeof(struct can_frame),
0, (struct sockaddr*)&addr, sizeof(addr));
+ An accurate timestamp can be obtained with an ioctl(2) call after reading
+ a message from the socket:
+
+ struct timeval tv;
+ ioctl(s, SIOCGSTAMP, &tv);
+
+ The timestamp has a resolution of one microsecond and is set automatically
+ at the reception of a CAN frame.
+
Remark about CAN FD (flexible data rate) support:
Generally the handling of CAN FD is very similar to the formerly described