linux-kernel - Re: [PATCH v2 4/8] dt-bindings: gnss: add u-blox binding

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Message-ID: <20180601081548.GN3259@localhost>
Date:   Fri, 1 Jun 2018 10:15:48 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Andreas Kemnade <andreas@...nade.info>,
        Arnd Bergmann <arnd@...db.de>,
        "H . Nikolaus Schaller" <hns@...delico.com>,
        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" <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 4/8] dt-bindings: gnss: add u-blox binding

On Thu, May 31, 2018 at 10:58:59AM -0500, Rob Herring wrote:
> On Thu, May 31, 2018 at 9:34 AM, Johan Hovold <johan@...nel.org> wrote:
> > On Thu, May 31, 2018 at 08:55:10AM -0500, Rob Herring wrote:
> >> On Thu, May 31, 2018 at 3:22 AM, Johan Hovold <johan@...nel.org> wrote:
> >> > On Wed, May 30, 2018 at 10:58:05PM -0500, Rob Herring wrote:
> >> >> On Wed, May 30, 2018 at 12:32:38PM +0200, Johan Hovold wrote:
> >> >> > Add binding for u-blox GNSS receivers.

> >> >> > +Optional properties:
> >> >> > +
> >> >> > +- timepulse-gpios  : Time pulse GPIO
> >> >> > +- u-blox,extint-gpios      : External interrupt GPIO
> >> >>
> >> >> This should be interrupts property instead of a gpio.
> >> >
> >> > Contrary to what the name may suggest, this pin is actually an input
> >> > which can be used to control active power or to provide time or
> >> > frequency aiding data to the receiver (see section 1.13 in [1]).
> >> >
> >> > I only added it for completeness as the driver does not use it
> >> > currently. Remove, leave as is, or add "input" to the description as in:
> >> >
> >> >         - u-blox,extint-gpios   : External interrupt input GPIO
> >>
> >> Yes. You should also define the active level.
> >
> > The active level appears to be runtime configurable and dependent on the
> > selected function. For power control it can be used to control force-on
> > (active high), force-off (active low) or both; and for time aiding
> > sampling on falling or rising edge is also configurable. And who knows
> > what else this pin is used for next time they update the firmware. ;)
> 
> Okay.
> 
> > Shall I remove the property, or just add "input" as suggested above?
> 
> Just add "input".

I ended up rewording this as

	u-blox,extint-gpios  : GPIO connected to the "external
			       interrupt" input pin

to avoid any confusion about the direction of the GPIO.

Thanks,
Johan