CAN bit-timing calculation

configname: CONFIG_CAN_CALC_BITTIMING

Linux Kernel Configuration
└─>Networking support
└─>CAN bus subsystem support
└─>CAN Device Drivers
└─>CAN bit-timing calculation
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
If enabled, CAN bit-timing parameters will be calculated for the
bit-rate specified via Netlink argument "bitrate" when the device
get started. This works fine for the most common CAN controllers
with standard bit-rates but may fail for exotic bit-rates or CAN
source clock frequencies. Disabling saves some space, but then the
bit-timing parameters must be specified directly using the Netlink
arguments "tq", "prop_seg", "phase_seg1", "phase_seg2" and "sjw".
If unsure, say Y.