So today I finally tried it and it worksMade the changes.. now need to figure out a connector for I2S output to dac. any pointer for it?
You can take the I2S output from the usbridge GPIO header inside. I connected my kali + piano 2.1 I2S card. It gets detected and it works. The only change I had to do was to enable I2S in /boot/config.txt and add the kernel driver for the allo piano2.1 and take the master clock from Kali
However the Kali board portrudes outside the case. But tried with just the usbridge and the piano 2.1. The card fits inside. However one will have to drill hole in the backplate to accomodate the piano 2.1. Very much doable# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=on
dtparam=i2s=on
#dtparam=spi=on
# Kali+Piano 2.1 DAC
dtoverlay=allo-piano-dac-plus-pcm512x-audio,glb_mclk