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

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Message-ID: <MW4PR11MB58005F4C9EFF1DF1541A421C86D49@MW4PR11MB5800.namprd11.prod.outlook.com>
Date:   Mon, 23 May 2022 16:56:44 +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 Thu, 19 May 2022 06:57 +0200 Jakub Kicinski wrote:
> > Create a second read-only TTY device.
> 
> Can you say more about how the TTY devices are discovered, and why there
> are two of them? Would be great if that info was present under
> Documentation/

Both TTY devices are used for the same GNSS module. First one is
read/write and the second one is read only. They are discovered by
checking ICE_E810T_P0_GNSS_PRSNT_N bit in ICE_PCA9575_P0_IN register.
This means that the GNSS module is physically present on the PCB.
The design with one RW and one RO TTY device was requested by
customers.

Thanks!
Karol