linux-kernel - Re: [PATCH v2 0/8] gnss: add new GNSS subsystem

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Message-ID: <20180531133730.GJ3259@localhost>
Date:   Thu, 31 May 2018 15:37:30 +0200
From:   Johan Hovold <johan@...nel.org>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Johan Hovold <johan@...nel.org>,
        Richard Cochran <richardcochran@...il.com>,
        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>, Pavel Machek <pavel@....cz>,
        Marcel Holtmann <marcel@...tmann.org>,
        Sebastian Reichel <sebastian.reichel@...labora.co.uk>,
        Tony Lindgren <tony@...mide.com>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 0/8] gnss: add new GNSS subsystem

On Thu, May 31, 2018 at 03:33:41PM +0200, H. Nikolaus Schaller wrote:
> > Am 31.05.2018 um 13:47 schrieb Johan Hovold <johan@...nel.org>:

> > Using pps-gpio would not allow you to describe the hardware properly,
> > something which, for example, may be needed for power management (e.g.
> > to power on the GNSS receiver when the pps device is being accessed).
> 
> Yes, that is indeed a very valid reason to do it that way as the pps-gpio
> seems to assume an always-on impulse source.
> 
> On the other hand it looks as if the pps framework can't tell the
> source when to power on/off because it does not notify when it
> is being accessed or not:
> 
> https://elixir.bootlin.com/linux/v4.17-rc7/source/drivers/pps/pps.c#L305

Yeah, we may need to address that when/if we get there.

Thanks,
Johan