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

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Date:   Thu, 31 May 2018 11:52:18 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     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


> Am 31.05.2018 um 10:52 schrieb Johan Hovold <johan@...nel.org>:
> 
> On Wed, May 30, 2018 at 07:38:22AM -0700, Richard Cochran wrote:
>> On Wed, May 30, 2018 at 12:32:34PM +0200, Johan Hovold wrote:
>>> Another possible extension is to add generic 1PPS support.
>> 
>> There are two possibilities to consider.
>> 
>> 1. If the PPS causes an interrupt, then it should hook into the PPS
>>   subsystem.
> 
> Registering a PPS child device is what I had in mind for this.

This seems to be duplicating functionality that is already solved by

https://elixir.bootlin.com/linux/v4.17-rc7/source/Documentation/devicetree/bindings/pps/pps-gpio.txt

and

https://elixir.bootlin.com/linux/v4.17-rc7/source/drivers/pps/clients/pps-gpio.c

Or what is bad with just using that?

BR,
Nikolaus