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

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Message-ID: <20180425062659.GA5352@amd>
Date:   Wed, 25 Apr 2018 08:26:59 +0200
From:   Pavel Machek <pavel@....cz>
To:     Johan Hovold <johan@...nel.org>
Cc:     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!

> This series adds a new subsystem for GNSS receivers (e.g. GPS
> receivers).
> 
> While GNSS receivers are typically accessed using a UART interface they
> often also support other I/O interfaces such as I2C, SPI and USB, while
> yet other devices use iomem or even some form of remote-processor
> messaging (rpmsg).
>     
> The new GNSS subsystem abstracts the underlying interface and provides a
> new "gnss" class type, which exposes a character-device interface (e.g.
> /dev/gnss0) to user space. This allows GNSS receivers to have a
> representation in the Linux device model, something which is important
> not least for power management purposes and which also allows for easy
> detection and (eventually) identification of GNSS devices.

Actually... no, what you done is not GNSS subsystem. It is generic
subsystem for a link + some controls, typically for power.

Yes, that setup is common for GPS receivers, but it is there also for
modems (droid 4: usb + gpios) and bluetooth dongles (n900: serial +
gpios).

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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