es9038q2m can run in async mode, so MCLK would not be needed as you have crystals on the board, no? How do you handle I2S input from Raspi that also does not supply a MCLK signal?
Btw. could I also use pin 29, (30), 32 and 33 of the 40pin GPIO as I2S input for stand alone DAC? The 30pin FPC frankly is not very handy for DIY…