Digital Audio Mux module support

modulename: snd-soc-imx-audmux.ko

configname: CONFIG_SND_SOC_IMX_AUDMUX

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>SoC Audio for Freescale CPUs
└─>Digital Audio Mux module support
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Say Y if you want to add Digital Audio Mux (AUDMUX) support
for the ARM i.MX CPUs.
This option is only useful for out-of-tree drivers since
in-tree drivers select it automatically.

source code: