(5.5) kernel has basic support for the IR-receiver
CONFIG_MEDIA_SUPPORT=y CONFIG_MEDIA_RC_SUPPORT=y CONFIG_RC_CORE=y CONFIG_RC_DEVICES=y CONFIG_LIRC=y CONFIG_IR_MTK=y CONFIG_RC_DECODERS=y CONFIG_IR_NEC_DECODER=m
to use the IR-receiver you can try this commands
apt install evtest apt install v4l-utils apt install ir-keytable
root@bpi-r2:~# ir-ctl -r root@bpi-r2:~# ir-keytable -s rc0 -p all -t root@bpi-r2:~# evtest