CONFIG_MFD_ATMEL_SMC (not configurable)

modulename: atmel-smc.ko

configname: CONFIG_MFD_ATMEL_SMC

Linux Kernel Configuration
└─>Device Drivers
└─>Multifunction device drivers
└─>MFD_ATMEL_SMC
In linux kernel since version 4.2 (release Date: 2015-08-30)  
source code:
drivers/mfd//atmel-smc.c