linux-kernel - Re: [PATCH 0/7] gnss: add new GNSS subsystem

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Date:   Wed, 25 Apr 2018 08:49:49 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andreas Kemnade <andreas@...nade.info>,
        Arnd Bergmann <arnd@...db.de>,
        "H . Nikolaus Schaller" <hns@...delico.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 0/7] gnss: add new GNSS subsystem

Hi Pavel,

>> This series adds a new subsystem for GNSS receivers (e.g. GPS
>> receivers).
> 
> Actually... I'd just call it GPS subsystem. Yes, GPS is a bit
> misleading, but so is GNSS. We'd like Loran to use similar interface,
> right? We'd like to QZSS to use similar interface, too…

GNSS is the term that is known and used by everybody in the industry to identify GPS, GLONASS, Galileo etc.

> https://www.pcworld.com/article/205325/japan_launches_its_first_gps_satellite.html
> . QZSS is not _global_ positioning system. Still they call it GPS. I'd
> call it GPS too.
> 
> (Alternatively, we could have drivers/position and /dev/pos0...)
> 
> Looking closer... I'm not sure if it makes sense to push different
> protocols (SiRF, NMEA, ...) through one device. Userland should know
> what protocol to expect... Yes, there will be common code between
> /dev/nmea0 and /dev/sirf0…

Device node naming is pointless, use DEVTYPE uevent property for identifying the expected protocol.

Regards

Marcel