RE: [PATCH] USB: serial: option: adding support for ublox R410M

From: SZ Lin (æäæ)
Date: Thu Apr 26 2018 - 22:20:27 EST


> Option is likely the right driver for this device.
> qcaux was mainly for mobile phones that have a TTY (often cdc-acm) as the modem port
> and a secondary DIAG/DM port driven by qcaux. The DM port doesn't have an interrupt
> endpoint thus it's not a normal modem port requiring the larger buffers of option and its
> control signaling.
> qcserial (as Bjorn mentioned) is only for actual Gobi-type devices with the specific layouts
> and the firmware loading requirement where the 1K and 2K devices start in a special
> 1-port mode waiting for firmware and then become 4-port devices on firmware reboot.
> Dan

Thank you all. I believe that many people are confused in selecting serial driver (option and qcserial)
for QUALCOMM based module. This thread has provided clearly and properly presented the different
between them.