netdev - [PATCH 3/7] iplink_can: print_usage: describe the CAN bittiming units

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Message-Id: <20251129-canxl-netlink-v1-3-96f2c0c54011@kernel.org>
Date: Sat, 29 Nov 2025 16:29:08 +0100
From: Vincent Mailhol <mailhol@...nel.org>
To: netdev@...r.kernel.org, Stephen Hemminger <stephen@...workplumber.org>, 
 Marc Kleine-Budde <mkl@...gutronix.de>, 
 Oliver Hartkopp <socketcan@...tkopp.net>, David Ahern <dsahern@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-can@...r.kernel.org, 
 Vincent Mailhol <mailhol@...nel.org>
Subject: [PATCH 3/7] iplink_can: print_usage: describe the CAN bittiming
 units

While the meaning of "bps" or "ns" may be relatively easy to understand,
some of the CAN specific units such as "mtq" (minimum time quanta) may be
harder to understand.

Add a new paragraph to the help menu which describes all the different
units used for the CAN bittiming parameters.

Signed-off-by: Vincent Mailhol <mailhol@...nel.org>
---
 ip/iplink_can.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ip/iplink_can.c b/ip/iplink_can.c
index ee27659c..a2f59764 100644
--- a/ip/iplink_can.c
+++ b/ip/iplink_can.c
@@ -60,6 +60,13 @@ static void print_usage(FILE *f)
 		"\t	TDCO		:= { NUMBER in mtq }\n"
 		"\t	TDCF		:= { NUMBER in mtq }\n"
 		"\t	RESTART-MS	:= { 0 | NUMBER in ms }\n"
+		"\n"
+		"\tUnits:\n"
+		"\t	bps	:= bit per second\n"
+		"\t	ms	:= milli second\n"
+		"\t	mtq	:= minimum time quanta\n"
+		"\t	ns	:= nano second\n"
+		"\t	tq	:= time quanta\n"
 		);
 }
 

-- 
2.51.2