ASoC Audio Graph sound card support

modulename: snd-soc-audio-graph-card.ko

configname: CONFIG_SND_AUDIO_GRAPH_CARD

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>Device Tree and Open Firmware support
└─>ASoC Audio Graph sound card support
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This option enables generic simple sound card support
with OF-graph DT bindings.
It also support DPCM of multi CPU single Codec ststem.

source code: