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I got the exact same error as someone asked on the raspberry pi forums. But no solution was found yet. https://www.raspberrypi.org/forums/viewtopic.php?t=183617

I've connected max98357-i2s to the Rpi via I2S and it's working ok. https://learn.adafruit.com/adafruit-max98357-i2s-class-d-mono-amp/raspberry-pi-usage

Now I'm trying to connect a microphone also via I2S. What I did was following the instructions in the following page: https://learn.adafruit.com/adafruit-i2s-mems-microphone-breakout?view=all

Somewhere in the middle, it says: Download the module, written by Paul Creaser

git clone https://github.com/PaulCreaser/rpi-i2s-audio
cd rpi-i2s-audio
make -C /lib/modules/$(uname -r )/build M=$(pwd) modules
sudo insmod my_loader.ko

Verify that the module was loaded:

lsmod | grep my_loader
dmesg | tail

But in dmesg I get:

bcm2835-i2s 20203000.i2s: Trying to bind component to card
"snd_rpi_simple_card" but is already bound to card
"snd_rpi_hifiberry_dac"

asoc-simple-card asoc-simple-card.0: ASoC: failed to instantiate card
-19

It seems that the mic is trying to bind to the same sound card the speaker is bound to. What can I do? Is there another option to connect both mic and speaker to I2S?

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