can-config sample-point setup

I need to set up sample-points for CANFD bus.  The following help command shows how to set up sample-points for can, but my can configuration is not showing any sample points argument.

ip link set can0 type can help
Usage: ip link set DEVICE type can
        [ bitrate BITRATE [ sample-point SAMPLE-POINT] ] |
        [ tq TQ prop-seg PROP_SEG phase-seg1 PHASE-SEG1
          phase-seg2 PHASE-SEG2 [ sjw SJW ] ]

        [ dbitrate BITRATE [ dsample-point SAMPLE-POINT] ] |
        [ dtq TQ dprop-seg PROP_SEG dphase-seg1 PHASE-SEG1
          dphase-seg2 PHASE-SEG2 [ dsjw SJW ] ]
        [ tdcv TDCV tdco TDCO tdcf TDCF ]

        [ loopback { on | off } ]
        [ listen-only { on | off } ]
        [ triple-sampling { on | off } ]
        [ one-shot { on | off } ]
        [ berr-reporting { on | off } ]
        [ fd { on | off } ]
        [ fd-non-iso { on | off } ]
        [ presume-ack { on | off } ]
        [ cc-len8-dlc { on | off } ]
        [ tdc-mode { auto | manual | off } ]

        [ restart-ms TIME-MS ]
        [ restart ]

        [ termination { 0..65535 } ]

        Where: BITRATE  := { NUMBER in bps }
                  SAMPLE-POINT  := { 0.000..0.999 }
                  TQ            := { NUMBER in ns }
                  PROP-SEG      := { NUMBER in tq }
                  PHASE-SEG1    := { NUMBER in tq }
                  PHASE-SEG2    := { NUMBER in tq }
                  SJW           := { NUMBER in tq }
                  TDCV          := { NUMBER in tc }
                  TDCO          := { NUMBER in tc }
                  TDCF          := { NUMBER in tc }
                  RESTART-MS    := { 0 | NUMBER in ms }

I suspect this is set to 0 by default, which matches the can.txt resources.  This document mentions calculation of bit-timing manipulation is enabled in the kernel (CONFIG_CAN_CALC_BITTIMING). But I am having trouble at which location this (CONFIG_CAN_CALC_BITTIMING) enabling should happen in kernel file.  I would really appreciate help on this.