Trying to get a new DAC and RPi 2B working using I2S

[Tim Curtis]

Technically the files are not the actual device driver but whats called a device tree overlay (dtoverlay) file. It's basically a setup file thats used to specify to the Linux kernel the audio CODEC, supported sample rates, whether I2C comms is used, clock switching, etc.

Generic 1 loads the device tree overlay named hifiberry-dac which specifies audio CODEC pcm5102a
https://github.com/raspberrypi/linux/blo...verlay.dts

Generic 2 loads the device tree overlay named i2s-dac which specifies audio CODEC pcm1794a
https://github.com/raspberrypi/linux/blo...verlay.dts

Kernel overlay readme
https://github.com/raspberrypi/linux/blo...ays/README

You can search the Raspberry Pi Linux sources for the audio CODEC sources and other related files.
https://github.com/raspberrypi/linux/

*** In any case the maker of the DAC should be able to tell you specifically what Linux I2S overlay should be used.