linux-kernel - Re: [PATCHv2] USB: serial: option: Add Motorola modem UARTs

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Message-ID: <20190815112737.GD32300@localhost>
Date:   Thu, 15 Aug 2019 13:27:37 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bjørn Mork <bjorn@...k.no>,
        Dan Williams <dan.j.williams@...el.com>,
        Lars Melin <larsm17@...il.com>,
        Marcel Partap <mpartap@....net>,
        Merlijn Wajer <merlijn@...zup.org>,
        Michael Scott <hashcode0f@...il.com>,
        NeKit <nekit1000@...il.com>, Pavel Machek <pavel@....cz>,
        Sebastian Reichel <sre@...nel.org>
Subject: Re: [PATCHv2] USB: serial: option: Add Motorola modem UARTs

On Thu, Aug 15, 2019 at 01:26:02AM -0700, Tony Lindgren wrote:
> On Motorola Mapphone devices such as Droid 4 there are five USB ports
> that do not use the same layout as Gobi 1K/2K/etc devices listed in
> qcserial.c. So we should use qcaux.c or option.c as noted by
> Dan Williams <dan.j.williams@...el.com>.
> 
> As the Motorola USB serial ports have an interrupt endpoint as shown
> with lsusb -v, we should use option.c instead of qcaux.c as pointed out
> by Johan Hovold <johan@...nel.org>.
> 
> The ff/ff/ff interfaces seem to always be UARTs on Motorola devices.
> For the other interfaces, class 0x0a (CDC Data) should not in general
> be added as they are typically part of a multi-interface function as
> noted earlier by Bjørn Mork <bjorn@...k.no>.
> 
> However, looking at the Motorola mapphone kernel code, the mdm6600 0x0a
> class is only used for flashing the modem firmware, and there are no
> other interfaces. So I've added that too with more details below as it
> works just fine.
> 
> The ttyUSB ports on Droid 4 are:
> 
> ttyUSB0 DIAG, CQDM-capable
> ttyUSB1 MUX or NMEA, no response
> ttyUSB2 MUX or NMEA, no response
> ttyUSB3 TCMD
> ttyUSB4 AT-capable

> Tested-by: Pavel Machek <pavel@....cz>
> Signed-off-by: Tony Lingren <tony@...mide.com>

I fixed up the typo in your name here, which checkpatch caught.

> ---
> 
> Changes since v1:
> - Leave out defines as suggested by Lars

Thanks, Tony. Now applied.

Johan