SKL with NAU88L25 and MAX98357A in I2S Mode

modulename: snd-skl_nau88l25_max98357a.ko

configname: CONFIG_SND_SOC_INTEL_SKL_NAU88L25_MAX98357A_MACH

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>Intel Machine drivers
└─>SKL with NAU88L25 and MAX98357A in I2S Mode
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This adds support for ASoC Onboard Codec I2S machine driver. This will
create an alsa sound card for NAU88L25 + MAX98357A.
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/