hikey970:/ $ lsusb
Bus 002 Device 002: ID 0451:8140
Bus 001 Device 001: ID 1d6b:0002
Bus 001 Device 004: ID 046d:0a0b
Bus 001 Device 002: ID 0451:8142
Bus 002 Device 001: ID 1d6b:0003
Bus 001 Device 003: ID 222a:0001
hikey970:/ $ cat proc/asound/cards
0 [hikeyhdmi ]: hikey-hdmi - hikey-hdmi
hikey-hdmi