rk3568_r:/storage/emulated/0 # cat /proc/asound/cards                                                   
 0 [rockchiphdmi   ]: rockchip_hdmi - rockchip,hdmi
                      rockchip,hdmi
 1 [rockchiprk809co]: rockchip_rk809- - rockchip,rk809-codec
                      rockchip,rk809-codec
 2 [UR22C          ]: USB-Audio - Steinberg UR22C
                      Yamaha Corporation Steinberg UR22C at usb-xhci-hcd.5.auto-1, high speed			
			
			

			
rk3568_r:/storage/emulated/0 # cat /proc/asound/devices                                                
  2: [ 0- 0]: digital audio playback
  3: [ 0]   : control
  4: [ 1- 0]: digital audio playback
  5: [ 1- 0]: digital audio capture
  6: [ 1]   : control
  7: [ 2- 0]: digital audio playback
  8: [ 2- 0]: digital audio capture
  9: [ 2]   : control
 10: [ 2- 0]: raw midi
 33:        : timer
			
			
			

			
rk3568_r:/storage/emulated/0 # cat /proc/asound/pcm
00-00: fe400000.i2s-i2s-hifi i2s-hifi-0 : fe400000.i2s-i2s-hifi i2s-hifi-0 : playback 1
01-00: fe410000.i2s-rk817-hifi rk817-hifi-0 : fe410000.i2s-rk817-hifi rk817-hifi-0 : playback 1 : capture 1
02-00: USB Audio : USB Audio : playback 1 : capture 1