netdev - Re: Re: [RFC PATCH v2 0/6] net: wwan: add NMEA port type support

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Message-ID: <CAGRyCJG-JvPu5Gizn8qEZy0QNYgw6yVxz6_KW0K0HUfhZsrmbw@mail.gmail.com>
Date: Mon, 22 Sep 2025 22:19:01 +0200
From: Daniele Palmas <dnlplm@...il.com>
To: Loic Poulain <loic.poulain@....qualcomm.com>
Cc: Slark Xiao <slark_xiao@....com>, Sergey Ryazanov <ryazanov.s.a@...il.com>, 
	Muhammad Nuzaihan <zaihan@...ealasia.net>, Johannes Berg <johannes@...solutions.net>, 
	Andrew Lunn <andrew+netdev@...n.ch>, Eric Dumazet <edumazet@...gle.com>, 
	"David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	netdev@...r.kernel.org, Qiang Yu <quic_qianyu@...cinc.com>, 
	Manivannan Sadhasivam <mani@...nel.org>, Johan Hovold <johan@...nel.org>
Subject: Re: Re: [RFC PATCH v2 0/6] net: wwan: add NMEA port type support

Hi Loic,

Il giorno lun 22 set 2025 alle ore 10:03 Loic Poulain
<loic.poulain@....qualcomm.com> ha scritto:
>
> Adding Daniele,
>
> On Tue, Sep 16, 2025 at 9:23 AM Slark Xiao <slark_xiao@....com> wrote:
> >
> >
> > At 2025-09-15 00:43:05, "Sergey Ryazanov" <ryazanov.s.a@...il.com> wrote:
> > >Hi Slark,
> > >
> > >On 9/11/25 05:42, Slark Xiao wrote:
> > >> At 2025-06-30 15:30:14, "Loic Poulain" <loic.poulain@....qualcomm.com> wrote:
> > >>> On Sun, Jun 29, 2025 at 12:07 PM Sergey Ryazanov <ryazanov.s.a@...il.com> wrote:
> > >>>> On 6/29/25 05:50, Loic Poulain wrote:
> > >>>>> On Tue, Jun 24, 2025 at 11:39 PM Sergey Ryazanov <ryazanov.s.a@...il.com> wrote:
> > >>>>>> The series introduces a long discussed NMEA port type support for the
> > >>>>>> WWAN subsystem. There are two goals. From the WWAN driver perspective,
> > >>>>>> NMEA exported as any other port type (e.g. AT, MBIM, QMI, etc.). From
> > >>>>>> user space software perspective, the exported chardev belongs to the
> > >>>>>> GNSS class what makes it easy to distinguish desired port and the WWAN
> > >>>>>> device common to both NMEA and control (AT, MBIM, etc.) ports makes it
> > >>>>>> easy to locate a control port for the GNSS receiver activation.
> > >>>>>>
> > >>>>>> Done by exporting the NMEA port via the GNSS subsystem with the WWAN
> > >>>>>> core acting as proxy between the WWAN modem driver and the GNSS
> > >>>>>> subsystem.
> > >>>>>>
> > >>>>>> The series starts from a cleanup patch. Then two patches prepares the
> > >>>>>> WWAN core for the proxy style operation. Followed by a patch introding a
> > >>>>>> new WWNA port type, integration with the GNSS subsystem and demux. The
> > >>>>>> series ends with a couple of patches that introduce emulated EMEA port
> > >>>>>> to the WWAN HW simulator.
> > >>>>>>
> > >>>>>> The series is the product of the discussion with Loic about the pros and
> > >>>>>> cons of possible models and implementation. Also Muhammad and Slark did
> > >>>>>> a great job defining the problem, sharing the code and pushing me to
> > >>>>>> finish the implementation. Many thanks.
> > >>>>>>
> > >>>>>> Comments are welcomed.
>
> Daniele, do you think this feature could be relevant for Telit
> modules, assuming any of them expose an NMEA channel?
> Is that something you could test?
>

yeah, I think this is something I can test, not completely sure about when.

But I'll try to have a look at this at worst in the next week.

Regards,
Daniele

> Regards,
> Loic