[alsa-devel] soc-of.h file

I need to use function of_snd_soc_register_platform of soc-of.o i got soc-of.c file from patch [PATCH 1/3] ALSA SoC: Add OpenFirmware helper for matching bus and codec drivers with but i am not able to find soc-of.h file please provide this to me. Regards, Dinesh Dua