From: Marc Kleine-Budde <mkl@pengutronix.de>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, kuba@kernel.org, linux-can@vger.kernel.org,
kernel@pengutronix.de,
Vincent Mailhol <mailhol.vincent@wanadoo.fr>,
Marc Kleine-Budde <mkl@pengutronix.de>
Subject: [net-next 10/39] can: bittiming: add CAN_KBPS, CAN_MBPS and CAN_MHZ macros
Date: Tue, 30 Mar 2021 13:45:30 +0200 [thread overview]
Message-ID: <20210330114559.1114855-11-mkl@pengutronix.de> (raw)
In-Reply-To: <20210330114559.1114855-1-mkl@pengutronix.de>
From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
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 2907e60c9a57..f49170eadd54 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 3c4cad7b52c0..ae7a3411167c 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
next prev parent reply other threads:[~2021-03-30 11:47 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-30 11:45 pull-request: can-next 2021-03-30 Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 01/39] MAINTAINERS: remove Dan Murphy from m_can and tcan4x5x Marc Kleine-Budde
2021-03-30 20:10 ` patchwork-bot+netdevbpf
2021-03-30 11:45 ` [net-next 02/39] MAINTAINERS: Update MCAN MMIO device driver maintainer Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 03/39] can: dev: always create TX echo skb Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 04/39] can: dev: can_free_echo_skb(): don't crash the kernel if can_priv::echo_skb is accessed out of bounds Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 05/39] can: dev: can_free_echo_skb(): extend to return can frame length Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 06/39] can: add new CAN FD bittiming parameters: Transmitter Delay Compensation (TDC) Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 07/39] can: dev: reorder struct can_priv members for better packing Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 08/39] can: netlink: move '=' operators back to previous line (checkpatch fix) Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 09/39] can: bittiming: add calculation for CAN FD Transmitter Delay Compensation (TDC) Marc Kleine-Budde
2021-03-30 11:45 ` Marc Kleine-Budde [this message]
2021-03-30 11:45 ` [net-next 11/39] can: grcan: add missing Kconfig dependency to HAS_IOMEM Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 12/39] can: xilinx_can: Simplify code by using dev_err_probe() Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 13/39] can: ucan: fix alignment constraints Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 14/39] can: peak_usb: pcan_usb_pro_encode_msg(): use macros for flags instead of plain integers Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 15/39] can: peak_usb: add support of ethtool set_phys_id() Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 16/39] can: peak_usb: add support of ONE_SHOT mode Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 17/39] can: m_can: m_can_class_allocate_dev(): remove impossible error return judgment Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 18/39] can: m_can: add infrastructure for internal timestamps Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 19/39] can: m_can: m_can_chip_config(): enable and configure " Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 20/39] can: m_can: fix periph RX path: use rx-offload to ensure skbs are sent from softirq context Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 21/39] can: tcan4x5x: remove duplicate include of regmap.h Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 22/39] can: mcp251xfd: add dev coredump support Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 23/39] can: mcp251xfd: simplify UINC handling Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 24/39] can: mcp251xfd: move netdevice.h to mcp251xfd.h Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 25/39] can: mcp251xfd: mcp251xfd_get_timestamp(): move " Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 26/39] can: mcp251xfd: add HW timestamp infrastructure Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 27/39] can: mcp251xfd: add HW timestamp to RX, TX and error CAN frames Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 28/39] can: c_can: convert block comments to network style comments Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 29/39] can: c_can: remove unnecessary blank lines and add suggested ones Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 30/39] can: c_can: fix indention Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 31/39] can: c_can: fix print formating string Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 32/39] can: c_can: replace double assignments by two single ones Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 33/39] can: c_can: fix remaining checkpatch warnings Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 34/39] can: c_can: remove unused code Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 35/39] can: c_can: fix indentation Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 36/39] can: c_can: add a comment about IF_RX interface's use Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 37/39] can: c_can: use 32-bit write to set arbitration register Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 38/39] can: c_can: prepare to up the message objects number Marc Kleine-Budde
2021-03-30 11:45 ` [net-next 39/39] can: c_can: add support to 64 message objects Marc Kleine-Budde
2021-03-30 20:10 ` pull-request: can-next 2021-03-30 patchwork-bot+netdevbpf
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