I have a dev kit of the ublox f9p (C099) and am having issues getting the serial ports to work on the pi. The dev board has a USB hub that combines 3 usb devices. 2 of these devices are serial ports (over USB), 1 is a true USB port. The true USB port appears to be working fine, but the 2 serial ports do not populate as a /dev/ttyUSB* as expected. One device shows up as /dev/ttyACM0, but there should be 2 devices. It looks like it might be a missing driver issue as Dev 21/22 below don't show a driver being used, but not sure where to go from here. Any advice on what to check to do is appreciated. Thanks.
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@rpi_ubloxbase:~ $ lsusb -t
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/5p, 480M
|__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=smsc95xx, 480M
|__ Port 5: Dev 20, If 0, Class=Hub, Driver=hub/3p, 480M
|__ Port 1: Dev 21, If 0, Class=Vendor Specific Class, Driver=, 12M
|__ Port 2: Dev 22, If 0, Class=Vendor Specific Class, Driver=, 12M
|__ Port 3: Dev 23, If 0, Class=Communications, Driver=cdc_acm, 12M
|__ Port 3: Dev 23, If 1, Class=CDC Data, Driver=cdc_acm, 12M
pi@rpi_ubloxbase:~ $ dmesg
[ 1710.901293] usb 1-1.5: new high-speed USB device number 20 using dwc_otg
[ 1711.031539] usb 1-1.5: New USB device found, idVendor=0424, idProduct=2514
[ 1711.031555] usb 1-1.5: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 1711.032247] hub 1-1.5:1.0: USB hub found
[ 1711.032333] hub 1-1.5:1.0: 3 ports detected
[ 1711.351338] usb 1-1.5.1: new full-speed USB device number 21 using dwc_otg
[ 1711.510015] usb 1-1.5.1: New USB device found, idVendor=1546, idProduct=0502
[ 1711.510030] usb 1-1.5.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1711.510040] usb 1-1.5.1: Product: C099; ZED-F9P
[ 1711.510049] usb 1-1.5.1: Manufacturer: u-blox AG
[ 1711.510056] usb 1-1.5.1: SerialNumber: DBSOHAUH
[ 1711.611285] usb 1-1.5.2: new full-speed USB device number 22 using dwc_otg
[ 1711.770010] usb 1-1.5.2: New USB device found, idVendor=1546, idProduct=0503
[ 1711.770025] usb 1-1.5.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1711.770035] usb 1-1.5.2: Product: C099; ODIN-W2
[ 1711.770043] usb 1-1.5.2: Manufacturer: u-blox AG
[ 1711.770051] usb 1-1.5.2: SerialNumber: DBSOHAUO
[ 1712.071279] usb 1-1.5.3: new full-speed USB device number 23 using dwc_otg
[ 1712.203511] usb 1-1.5.3: New USB device found, idVendor=1546, idProduct=01a9
[ 1712.203526] usb 1-1.5.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 1712.203536] usb 1-1.5.3: Product: u-blox GNSS receiver
[ 1712.203544] usb 1-1.5.3: Manufacturer: u-blox AG - www.u-blox.com
[ 1712.204535] cdc_acm 1-1.5.3:1.0: ttyACM0: USB ACM device
pi@rpi_ubloxbase:~ $ uname -a
Linux rpi_ubloxbase 4.14.98-v7+ #1200 SMP Tue Feb 12 20:27:48 GMT 2019 armv7l GNU/Linux
pi@rpi_ubloxbase:~ $