CONFIG_REGMAP_MMIO (not configurable)

modulename: regmap-mmio.ko

configname: CONFIG_REGMAP_MMIO

Linux Kernel Configuration
└─>Device Drivers
└─>Generic Driver Options
└─>REGMAP_MMIO
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
drivers/base//regmap/regmap-mmio.c