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问题描述及复现步骤:

在Ubuntu20.04下，能看到 HDMI的音频输出设备：rockchiphdmi
root@firefly:/usr/local/bin# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: rockchiprk3328 [rockchip,rk3328], device 0: ff010000.i2s-rk3328-hifi rk3328-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: rockchiphdmi [rockchip,hdmi], device 0: ff000000.i2s-i2s-hifi i2s-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0

看不到音频输入设备：

root@firefly:/usr/local/bin# arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: rockchiprk3328 [rockchip,rk3328], device 0: ff010000.i2s-rk3328-hifi rk3328-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0

请问专家：
1）RK3328-PC能否增加在一个HDMI音频输入设备？
2）是否需要重新编译Linux内核？还是说在现有固件下配置alsa就可以实现？