Ready for review
WM9715 Audio Codec, Trizeps VII
AC97 Codec Registers
Printing Codec Registers
cd /sys/kernel/debug/asoc/wm97xx-audio/wm9712-codec
cat codec_reg
Changing Codec Registers
cd /sys/kernel/debug/asoc/wm97xx-audio/wm9712-codec
# write 0x1234 to reg 2
echo 0x2 0x1234 >codec_reg