Enable compatibility bits for old user-space

configname: CONFIG_I2C_COMPAT

Linux Kernel Configuration
└─>Device Drivers
└─>I2C support
└─>Enable compatibility bits for old user-space
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
Say Y here if you intend to run lm-sensors 3.1.1 or older, or any
other user-space package which expects i2c adapters to be class
devices. If you don't know, say Y.

depends
CONFIG_I2C