I2C slave support

configname: CONFIG_I2C_SLAVE

Linux Kernel Configuration
└─>Device Drivers
└─>I2C support
└─>I2C slave support
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This enables Linux to act as an I2C slave device. Note that your I2C
bus master driver also needs to support this functionality. Please
read Documentation/i2c/slave-interface.rst for further details.