Linux USB: Where to report that a specific device is in fact supported by `usbserial`, although not recognised automatically?

I have an USB device that the kernel does not automatically recognise as an USB serial device but when I manually say to the usbserial driver that it should bind to it (modprobe usbserial vendor=0x0421 product=0x069a), it provides to USB serial interfaces where useful things can be done over it. What is the right place (email-address, bug tracker, ...) to report it to the correct Linux subsystem maintainers to include that device for automatic binding?