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can: bittiming: add CAN_KBPS, CAN_MBPS and CAN_MHZ macros

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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>
This commit is contained in:
Vincent Mailhol 2021-03-06 14:40:40 +09:00 committed by Marc Kleine-Budde
parent c25cc79932
commit 1d7750760b
2 changed files with 10 additions and 2 deletions
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4
drivers/net/can/dev/bittiming.c
View File

@ -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;

8
include/linux/can/bittiming.h
View File

@ -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
*