netdev - Re: [PATCH net-next 3/3] ice: add write functionality for GNSS TTY

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Message-ID: <MW4PR11MB58003D5B00016D1F30E0DC0686B59@MW4PR11MB5800.namprd11.prod.outlook.com>
Date:   Thu, 23 Jun 2022 13:39:35 +0000
From:   "Kolacinski, Karol" <karol.kolacinski@...el.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "G, GurucharanX" <gurucharanx.g@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>
Subject: Re: [PATCH net-next 3/3] ice: add write functionality for GNSS TTY

On Mon, 23 May 2022 19:58 +0000 Jakub Kicinski wrote:
> I meant discovered at the uAPI level. Imagine I plug in a shiny E810T
> with a GNSS receiver into a box, the PRSNT_N bit is set and the driver
> registered the ttys. How do I find the GNSS under /dev ?

If the module is physically present, driver creates 2 TTYs for each supported
device in /dev, ttyGNSS_<device>:<function>_0 and _1. First one (_0) is RW and
the second one is RO.
The protocol of write commands is dependent on the GNSS module as the driver
writes raw bytes from the TTY to the GNSS i2c.

I added this to Documentation/.

Thanks,
Karol