linux-kernel - Re: [Letux-kernel] [PATCH v5 3/5] misc serdev: Add w2sg0004 (gps receiver) power control driver

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Date:   Tue, 27 Feb 2018 08:04:15 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Johan Hovold <johan@...nel.org>,
        "H. Nikolaus Schaller" <hns@...delico.com>,
        Mark Rutland <mark.rutland@....com>,
        DTML <devicetree@...r.kernel.org>,
        Thierry Reding <treding@...dia.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Tony Lindgren <tony@...mide.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Russell King <linux@...linux.org.uk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Benoît Cousson <bcousson@...libre.com>,
        kernel@...a-handheld.com,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        Andreas Färber <afaerber@...e.de>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Letux-kernel] [PATCH v5 3/5] misc serdev: Add w2sg0004 (gps
 receiver) power control driver

On Mon, Feb 12, 2018 at 04:26:18PM +0100, Pavel Machek wrote:
> Hi!
> 
> > > Let's restart this discussion and focus on the main roadblock (others
> > > are minor details which can be sorted out later).
> > > 
> > > If it feels like a hack, the key issue seems to me to be the choice of
> > > the API to present the GPS data to user space. Right?
> > 
> > Or even more fundamentally, does this belong in the kernel at all?
> 
> Yes, it does.

But not necessarily in its current form.

> > Now, if we'd ever have a proper GPS framework that handled everything in
> > kernel space (i.e. no more gpsd) then we would be able to write kernel
> > drivers that also take care of PM. But perhaps that's unlikely to ever
> > be realised given the state of things (proprietary protocols, numerous
> > quirky implementations, etc).
> 
> That is what needs to happen.
> 
> > The kernel is probably not the place to be working around issues like
> > that, even if serdev at least allows for such hacks to be fairly
> > isolated in drivers (unlike some of the earlier proposals touching core
> > code).
> 
> Oh, kernel is indeed right place to provide hardware abstraction --
> and that includes bug workarounds.

Right, at least when such hacks can be confined to a driver and not be
spread all over the place.

Johan