netdev - Re:[net-next v6 0/8] net: wwan: add NMEA port type support

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Message-ID: <41675d06.99df.19bc178277f.Coremail.slark_xiao@163.com>
Date: Thu, 15 Jan 2026 19:43:55 +0800 (CST)
From: "Slark Xiao" <slark_xiao@....com>
To: loic.poulain@....qualcomm.com, ryazanov.s.a@...il.com,
	johannes@...solutions.net, andrew+netdev@...n.ch,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, mani@...nel.org
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re:[net-next v6 0/8] net: wwan: add NMEA port type support


At 2026-01-15 17:54:09, "Slark Xiao" <slark_xiao@....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 three 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. Daniele has caught an issue on driver
>unloading and suggested an investigation direction. What was concluded
>by Loic. Many thanks.
>
>Changes RFCv1->RFCv2:
>* Uniformly use put_device() to release port memory. This made code less
>  weird and way more clear. Thank you, Loic, for noticing and the fix
>  discussion!
>Changes RFCv2->RFCv5:
>* Fix premature WWAN device unregister; new patch 2/7, thus, all
>  subsequent patches have been renumbered
>* Minor adjustments here and there
>
>Sergey Ryazanov (7):
>  net: wwan: core: remove unused port_id field
>  net: wwan: core: explicit WWAN device reference counting
Ignore this serial since a typo which lead to build error.
See next v8 version later.

>  net: wwan: core: split port creation and registration
>  net: wwan: core: split port unregister and stop
>  net: wwan: add NMEA port support
>  net: wwan: hwsim: refactor to support more port types
>  net: wwan: hwsim: support NMEA port emulation
>
>Slark Xiao (1):
>  net: wwan: mhi_wwan_ctrl: Add NMEA channel support
>
> drivers/net/wwan/Kconfig         |   1 +
> drivers/net/wwan/mhi_wwan_ctrl.c |   1 +
> drivers/net/wwan/wwan_core.c     | 277 +++++++++++++++++++++++++------
> drivers/net/wwan/wwan_hwsim.c    | 201 ++++++++++++++++++----
> include/linux/wwan.h             |   2 +
> 5 files changed, 394 insertions(+), 88 deletions(-)
>
>-- 
>2.25.1