CONFIG_HAVE_CAN_FLEXCAN (not configurable)

configname: CONFIG_HAVE_CAN_FLEXCAN

Linux Kernel Configuration
└─>Networking support
└─>CAN bus subsystem support
└─>CAN Device Drivers
└─>HAVE_CAN_FLEXCAN
In linux kernel since version 2.6.36 (release Date: 2010-10-20)  

is depended by
CONFIG_SOC_IMX53