From 1d7750760b70ba8b0e641146eee1b3a343d1b292 Mon Sep 17 00:00:00 2001
From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Date: Sat, 6 Mar 2021 14:40:40 +0900
Subject: [PATCH] can: bittiming: add CAN_KBPS, CAN_MBPS and CAN_MHZ macros
Add three macro to simplify the readability of big bit timing numbers:
- CAN_KBPS: kilobits per second (one thousand)
- CAN_MBPS: megabits per second (one million)
- CAN_MHZ: megahertz per second (one million)
Example:
u32 bitrate_max = 8 * CAN_MBPS;
struct can_clock clock = {.freq = 80 * CAN_MHZ};
instead of:
u32 bitrate_max = 8000000;
struct can_clock clock = {.freq = 80000000};
Apply the new macro to driver/net/can/dev/bittiming.c.
Link: https://lore.kernel.org/r/20210306054040.76483-1-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
drivers/net/can/dev/bittiming.c | 4 ++--
include/linux/can/bittiming.h | 8 ++++++++
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/net/can/dev/bittiming.c b/drivers/net/can/dev/bittiming.c
index 2907e60c9a573..f49170eadd547 100644
--- a/drivers/net/can/dev/bittiming.c
+++ b/drivers/net/can/dev/bittiming.c
@@ -81,9 +81,9 @@ int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt,
if (bt->sample_point) {
sample_point_nominal = bt->sample_point;
} else {
- if (bt->bitrate > 800000)
+ if (bt->bitrate > 800 * CAN_KBPS)
sample_point_nominal = 750;
- else if (bt->bitrate > 500000)
+ else if (bt->bitrate > 500 * CAN_KBPS)
sample_point_nominal = 800;
else
sample_point_nominal = 875;
diff --git a/include/linux/can/bittiming.h b/include/linux/can/bittiming.h
index 3c4cad7b52c08..ae7a3411167c2 100644
--- a/include/linux/can/bittiming.h
+++ b/include/linux/can/bittiming.h
@@ -11,6 +11,14 @@
#define CAN_SYNC_SEG 1
+
+/* Kilobits and Megabits per second */
+#define CAN_KBPS 1000UL
+#define CAN_MBPS 1000000UL
+
+/* Megahertz */
+#define CAN_MHZ 1000000UL
+
/*
* struct can_tdc - CAN FD Transmission Delay Compensation parameters
*
--
2.30.2