Hi @TimSiegrist,
I’ve personally never tried to configure the I2S as a simple output before in the device tree. Though the suggestion from @matthijs seems reasonable. Could you give that a try and let us know how it works out.
I did also find this other thread from someone who did something similar on the Apalis i.MX8 in case it is also helpful here: I2s slave on Apalis iMX8 sai2
Best Regards,
Jeremias