CONFIG_ETRAX_I2C is not available for thedefaultarchitecture x86.
Result is shown for architecture cris

I2C support

modulename: i2c.ko

configname: CONFIG_ETRAX_I2C

Linux Kernel Configuration
└─>I2C support
In linux kernel since version 2.6.12  
Enables an I2C driver on ETRAX100.
EXAMPLE usage:
i2c_arg = I2C_WRITEARG(STA013_WRITE_ADDR, reg, val);
ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_WRITEREG), i2c_arg);
i2c_arg = I2C_READARG(STA013_READ_ADDR, reg);
val = ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_READREG), i2c_arg);

source code: