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>

diff --git a/drivers/net/can/dev/bittiming.c b/drivers/net/can/dev/bittiming.c
index 2907e60..f49170e 100644 (file)
--- 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 3c4cad7..ae7a341 100644 (file)
--- 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
  *