Allwinner A10 SPDIF Support

modulename: sun4i-spdif.ko

configname: CONFIG_SND_SUN4I_SPDIF

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>Allwinner SoC Audio support
└─>Device Tree and Open Firmware support
└─>Allwinner A10 SPDIF Support
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Say Y or M to add support for the S/PDIF audio block in the Allwinner
A10 and affiliated SoCs.

source code:
sound/soc//sunxi/sun4i-spdif.c