This anomaly applies to IC Rev. Engineering C, build codes CKAA-CA0, QIAA-CA0.
I2S controls GPIO even when I2S is not enabled.
When using I2S->PSEL to configure GPIO.
GPIO selected for I2S cannot be used for any other peripheral and will be configured as input.
Do not rely on the pins selected in I2S->PSEL registers being free when I2S->ENABLE is set to DISABLE.
Only set the CONNECT bit in the I2S->PSEL registers to CONNECTED immediately before enabling I2S. When disabling I2S, set the CONNECT bit in the I2S->PSEL registers to DISCONNECTED.