linux-kernel - Re: [PATCH] USB: serial: option: add Fibocom L7xx modules

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Message-ID: <ZUthrrt4WkYXTTZD@hovoldconsulting.com>
Date:   Wed, 8 Nov 2023 11:23:42 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Victor Fragoso <victorffs@...mail.com>
Cc:     "dcbw@...hat.com" <dcbw@...hat.com>,
        "gregkh@...uxfoundation.org" <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: add Fibocom L7xx modules

On Fri, Oct 27, 2023 at 05:55:27PM +0000, Victor Fragoso wrote:
> On Thu, 2023-10-26 at 08:49 -0500, Dan Williams wrote:
> > On Thu, 2023-10-26 at 01:24 +0000, Victor Fragoso wrote:
> > > Add support for Fibocom L7xx module series and variants.
> > > 
> > > L716-EU-60 (ECM):

> > > A:  FirstIf#= 0 IfCount= 2 Cls=02(comm.) Sub=06 Prot=00
> > > I:* If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=06 Prot=00 Driver=cdc_ether
> > > E:  Ad=87(I) Atr=03(Int.) MxPS=  16 Ivl=32ms
> > > I:  If#= 1 Alt= 0 #EPs= 0 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether
> > > I:* If#= 1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether
> > > E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> > > E:  Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> > > I:* If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
> > > E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> > > E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> > > I:* If#= 3 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
> > > E:  Ad=83(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> > > E:  Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> > > I:* If#= 4 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
> > > E:  Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> > > E:  Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> > > I:* If#= 5 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
> > > E:  Ad=85(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> > > E:  Ad=05(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> > > I:* If#= 6 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=42 Prot=01 Driver=usbfs
> > > E:  Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> > > E:  Ad=06(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

> > Also, are you at all able to give hints in the comments about what kind
> > of ports these are? AT? GPS? PPP? etc?  That's usually described in the
> > driver documentation or in the Windows drivers themselves.

> About the hints on comments (AT, PPP, etc) I am not so sure if I should
> add other hints.
> As I've mentioned on the other email to Lars:
> I am a Field Application Enginner at Fibocom Brazil and I am using the
> IDs from our internal and official documentation.
> This IDs will guarantee that can be used on all the variants devices
> from L71x series.
> For example, the 0x2cb7 0x0001 can be used by L716-EU on RNDIS, L716-
> EU-10 on ECM and L710 too. While 19d2 0579 can be used by L716-EU-60 on
> ECM and probably other variants.
> 
> So, to avoid any misunderstand I prefer to keep it simple and mention
> just as L71x series.

For the device entry comment I think you should use the model you've
tested, and if there are multiple modules you can possibly list more
than one if that makes sense.
 
But I think Dan was asking you to say something about what the
individual interfaces are used for. That's better added to the commit
message (i.e. describing which port is which).

Johan