The important source files are:
The first one adds customizations to RPi’s base dts file (also follow the #includes mentioning bcm), so it may need significant changes for the Tinkerboard. It defines some CPU peripheral and gpio pin configurations for Pisound.
The 2nd one is the kernel module, it’s fairly generic and based on ALSA’s SOC subsystem, the stuff in ‘pisnd_dai’ may have to be reconfigured for Tinkerboard, as it is referring to some BCM names, the rest should work as is if the dts is sorted out.