CONFIG_REGMAP_I2C (not configurable)

modulename: regmap-i2c.ko

configname: CONFIG_REGMAP_I2C

Linux Kernel Configuration
└─>Device Drivers
└─>Generic Driver Options
└─>REGMAP_I2C
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
drivers/base//regmap/regmap-i2c.c