Many thanks for this. I played a bit more around with these and found the following logic: With TOACODEC OUT EN and TOHDMITX one can enable analogue 3.5mm output and digital HDMI output. With TOACODEC SRC resp. TOHDMITX I2S SRC one can select the I2S device used for 3.5mm output respectively HDMI output. I cannot get I2S A working (because there is no TDMOUT_A at all), but I2S B and I2S C work for both HDMI and 3.5mm each. I assign it like you did, I2S B to TOHDMITX I2S SRC and I2
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