I found Mario Gomez seems using modified version of SpiDev and GPIO, hiding in special usr/local directories. These software seem not the same as the buster built in versions. So I am looking for other libraries which should be easier to use. Now I am looking at these: (1) ondryaso/pi-rc522 Rpi python library for SPI RFID RC522 module (Add support for interrupt driven tag detection) Latest commit
da9928a on Sep 12, 2019
https://github.com/ondryaso/pi-rc522
(2) Ondryaso rc-522 library listing