netdev - Re: [PATCH net-next v2 1/1] net: wwan: t7xx: Add AP CLDMA and GNSS port

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Date:   Wed, 29 Jun 2022 22:24:04 +0300
From:   Sergey Ryazanov <ryazanov.s.a@...il.com>
To:     Moises Veleta <moises.veleta@...ux.intel.com>
Cc:     netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Johannes Berg <johannes@...solutions.net>,
        Loic Poulain <loic.poulain@...aro.org>,
        M Chetan Kumar <m.chetan.kumar@...el.com>,
        "Devegowda, Chandrashekar" <chandrashekar.devegowda@...el.com>,
        Intel Corporation <linuxwwan@...el.com>,
        chiranjeevi.rapolu@...ux.intel.com,
        Haijun Liu (刘海军) 
        <haijun.liu@...iatek.com>,
        Ricardo Martinez <ricardo.martinez@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "Sharma, Dinesh" <dinesh.sharma@...el.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        "Veleta, Moises" <moises.veleta@...el.com>,
        Madhusmita Sahu <madhusmita.sahu@...el.com>
Subject: Re: [PATCH net-next v2 1/1] net: wwan: t7xx: Add AP CLDMA and GNSS port

Hello Moises,

On Tue, Jun 28, 2022 at 7:51 PM Moises Veleta
<moises.veleta@...ux.intel.com> wrote:
> The t7xx device contains two Cross Layer DMA (CLDMA) interfaces to
> communicate with AP and Modem processors respectively. So far only
> MD-CLDMA was being used, this patch enables AP-CLDMA and the GNSS
> port which requires such channel.
>
> GNSS AT control port allows Modem Manager to control GPS for:
> - Start/Stop GNSS sessions,
> - Configuration commands to support Assisted GNSS positioning
> - Crash & reboot (notifications when resetting device (AP) & host)
> - Settings to Enable/Disable GNSS solution
> - Geofencing

I am still in doubt, should we export the pure GNSS port via the wwan
subsystem. Personally, I like Loic's suggestion to export this port
via the gnss subsystem. This way, the modem interface will be
consistent with the kernel device model. What drawbacks do you see in
this approach?

--
Sergey