linux-kernel - Re: [RFC PATCH 0/3] bluetooth/gnss: GNSS support for TiWi chips

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Date:   Mon, 27 Nov 2023 15:54:24 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Andreas Kemnade <andreas@...nade.info>
Cc:     marcel@...tmann.org, johan.hedberg@...il.com, luiz.dentz@...il.com,
        johan@...nel.org, arnd@...db.de, gregkh@...uxfoundation.org,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        tomi.valkeinen@...asonboard.com,
        Péter Ujfalusi <peter.ujfalusi@...il.com>,
        robh@...nel.org
Subject: Re: [RFC PATCH 0/3] bluetooth/gnss: GNSS support for TiWi chips

* Andreas Kemnade <andreas@...nade.info> [231126 19:18]:
> So the main questions I see:
> - is the approach right to abandon drivers/misc/ti-st?

Yes.

> - Output at /dev/gnssX:
>   AI2 vs. NMEA
>   The chip can be configured into sending AI2-encapsulated NMEA,
>   or proving data in a binary format.
>   Some research has to be done yet for the details.
>   A pile of logs is waiting for further analysis...
> 
>   Arguments for/against NMEA:
>   + Userspace is prepared to handle it
>   + Power management can be easily done by the kernel
>   - Less functionality can be used.

I'd go with NMEA format as the default setting :)

>   Arguments for/against AI2:
>   + Full functionality can be accessed from userspace (incl. A-GPS,
>     maybe raw satellite data)
>   - Userspace has to behave to have proper power management
>   - No freely (not even as in beer) tool available to fully use AI2,
>     so there will be only a real advantage after long "French Cafe"
>     sessions.

Seems AI2 could be optionally enabled as needed with some writes
to /dev/gnss0 to change the mode?

Regards,

Tony