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Date:   Fri, 27 Apr 2018 02:14:55 +0000
From:   SZ Lin (林上智) <SZ.Lin@...a.com>
To:     Dan Williams <dcbw@...hat.com>, Johan Hovold <johan@...nel.org>,
        "Lars Melin" <larsm17@...il.com>
CC:     Bjørn Mork <bjorn@...k.no>,
        stable <stable@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] USB: serial: option: adding support for ublox R410M

<snip>

> 
> 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.

SZ

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