Configuration is straightforward - enable the device in /boot/config.txt:

# For more options and information see
# <http://rptl.io/configtxt>
# Some settings may impact device functionality. See link above for details

# Uncomment some or all of these to enable the optional hardware interfaces

dtparam=i2c_arm=on
dtparam=i2s=on
#dtparam=spi=on

# Enable audio (loads snd_bcm2835)
#dtparam=audio=on
dtoverlay=pifi-mini-210.dtbo

Next, tell the Pi5 that it has a 5A PSU:

sudo -E rpi-eeprom-config --edit

and add

PSU_MAX_CURRENT=5000

save, quit and wait for the EEPROM to be rewritten.

sudo reboot

and all should be in working order.