Synopsys I2S Device Driver

modulename: designware_i2s.ko

configname: CONFIG_SND_DESIGNWARE_I2S

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>Synopsys I2S Device Driver
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Say Y or M if you want to add support for I2S driver for
Synopsys desigwnware I2S device. The device supports upto
maximum of 8 channels each for play and record.

source code:
sound/soc//dwc/