Yes, you’re right and I apologize.
For those, who’re interested
GitHub - Arksine/katapult: Configurable bootloader for Klipper see 3rd Note.
KlipperToolboard/doc/canbus.md at master · bondus/KlipperToolboard · GitHub see MCP2515 based CAN HATs.
But current Klipper docs says:
Klipper currently supports CAN on stm32, SAME5x, and rp2040 chips. In addition, the micro-controller chip must be on a board that has a CAN transceiver…
… ## Host Hardware
In order to use a CAN bus, it is necessary to have a host adapter. It is recommended to use a “USB to CAN adapter”. There are many different USB to CAN adapters available from different manufacturers. When choosing one, we recommend verifying that the firmware can be updated on it. (Unfortunately, we’ve found some USB adapters run defective firmware and are locked down, so verify before purchasing.) Look for adapters that can run Klipper directly (in its “USB to CAN bridge mode”) or that run the candlelight firmware.