ESP32 Forum

Hi, the ksz8091 is not officially supported by esp-idf 4.4. The supported devices are ksz8041 and ksz8081.
The ksz8091 has got the same chip id of ksz8041 and ksz8081.
Can I use it as ksz8081? Does someone using it?

Yes, you can use it. The ESP-IDF PHY driver "runs" the PHY chip only in the basic mode and this is the same for both chips.

Difference between the chips is described here:
https://microchipsupport.force.com/s/ar ... ernet-PHYs