diff options
| author | Dong Aisheng <aisheng.dong@nxp.com> | 2017-12-15 18:49:38 +0800 |
|---|---|---|
| committer | Leonard Crestez <leonard.crestez@nxp.com> | 2018-08-24 12:41:33 +0300 |
| commit | 2f6b5c56b23eba9a0eafb006cee3ab5b30e502f2 (patch) | |
| tree | 65cee386a77299accf068a1f25103890726a8166 /drivers/net/can/flexcan.c | |
| parent | 6d6a3dc6c369d061c667652e3889f618f82494fe (diff) | |
MLK-16879-3 can: flexcan: add notes for avaliable fd mode rate combinations
CAN FD can only support some specific bitrate combinations in FD mode
due to HW limitations. See below info mentioned in RM:
"To minimize errors when processing FD frames, use the same value
for FPRESDIV and PRESDIV (in CAN_CBT or CAN_CTRL1)."
Add notes in driver to let user know easily:
CAN FD supported rates combinations
* Combination 1:
* Bitrate: 225000 375000 400000 425000 500000 875000
* Data rate: 1000000
*
* Combination 2:
* Bitrate: 550000 600000 625000 650000 675000 750000 775000
* 800000 850000 925000 950000 975000 1000000
* Data rate: 1500000 2000000 2500000 3000000 3500000 4000000
* 5000000
Acked-by: Jason Liu <jason.hui.liu@nxp.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Diffstat (limited to 'drivers/net/can/flexcan.c')
| -rw-r--r-- | drivers/net/can/flexcan.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 278f53c24b71..712006eab365 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -261,6 +261,25 @@ #define FLEXCAN_CANFD_MBDSR_SHIFT 16 #define FLEXCAN_CANFD_MBDSR_DEFAULT 0x6db +/* + * NOTE: + * To minimize errors when processing FD frames, use the same value + * for FPRESDIV and PRESDIV (in CAN_CBT or CAN_CTRL1). + * For more details refer to the first NOTE in section CAN FD frames. + * + * CAN FD supported rates combinations + * + * Combination 1: + * Bitrate: 225000 375000 400000 425000 500000 875000 + * Data rate: 1000000 + * + * Combination 2: + * Bitrate: 550000 600000 625000 650000 675000 750000 775000 + * 800000 850000 925000 950000 975000 1000000 + * Data rate: 1500000 2000000 2500000 3000000 3500000 4000000 + * 5000000 + */ + /* registers definition * * FIFO-MODE: |