for those who are interested, here is a link to important firmware update for Topping D70s:
To my experience, this DAC works with Volumio up to 192kHz. I guess that for higher sampling rates it needs special drivers, but the company does not provide any for Linux
You don’t need a driver for USB Audio devices, linux has a standard usb audio driver for that. Unless we are talking about some real exotic device, which Topping is not.