Baytrail and Baytrail-CR with RT5640 codec

modulename: snd-soc-sst-bytcr-rt5640.ko

configname: CONFIG_SND_SOC_INTEL_BYTCR_RT5640_MACH

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>Intel Machine drivers
└─>Baytrail and Baytrail-CR with RT5640 codec
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This adds support for ASoC machine driver for Intel(R) Baytrail and Baytrail-CR
platforms with RT5640 audio codec.
Say Y or m if you have such a device. This is a recommended option.
If unsure select "N".

source code:
sound/soc//intel/boards/