PCI HiFi2 (Merrifield) Platforms

configname: CONFIG_SND_SST_ATOM_HIFI2_PLATFORM_PCI

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>PCI support
└─>PCI HiFi2 (Merrifield) Platforms
In linux kernel since version 3.10 (release Date: 2013-06-30)  
If you have a Intel Merrifield/Edison platform, then
enable this option by saying Y or m. Distros will typically not
enable this option: while Merrifield/Edison can run a mainline
kernel with limited functionality it will require a firmware file
which is not in the standard firmware tree