linux-imx

can: flexcan: add CAN FD mode support

This patch intends to add CAN FD mode support in driver, it means that
payload size can extend up to 64 bytes.

Bit timing always set in CBT register other than CTRL1 register when
CANFD supports BRS, it will extend the range of all CAN bit timing
variables (PRESDIV, PROPSEG, PSEG1, PSEG2 and RJW), which will improve
the bit timing accuracy.

Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>