CONFIG_I2C_DESIGNWARE_CORE (not configurable)

modulename: i2c-designware-core.ko

configname: CONFIG_I2C_DESIGNWARE_CORE

Linux Kernel Configuration
└─>Device Drivers
└─>I2C support
└─>I2C Hardware Bus support
└─>I2C_DESIGNWARE_CORE
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
drivers/i2c//busses//
selects
CONFIG_REGMAP