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USB Serial drivers for Modem LTE (Spreadtrum?)


Hi there, 

I'm trying to integrate in my linux distribution (custom board based on STM32MP153) a LTE Modem (uBlox Lena R8) which is controllable via USB. 

At the powerup is see that the device tries to enable the USB (it should bring up 8 virtual COM/ttyUSBx): 



[ 1168.245519] usb 2-1: new high-speed USB device number 2 using ehci-platform
[ 1169.475865] usb 2-1: USB disconnect, device number 2
[ 1171.745516] usb 2-1: new high-speed USB device number 3 using ehci-platform



 but no ttyUSB is created. I'm pretty sure now that some driver is missing, because if I connect the usb from the module on a physical USB port on a desktop environment, it shows all the ttyUSB endpoint correctly. 

from lsusb command I can see that the module is recognized hw side: 



Bus 001 Device 003: ID 1782:4d10 Spreadtrum Communications Inc. UNISOC-8910



So I think that some usb serial / Spreadtrum driver is needed... Does anybody have an idea? Have you ever seen something like this? 

My distro is based on kernel v5.15 kirkstone (I don't remember ST ambient version)


Thank you very much