linux-kernel - Re: [PATCH 2/3] misc: bmp085: Add DT bindings for EOC gpio line and direct irq.

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Message-Id: <201311151947.51196.arnd@arndb.de>
Date:	Fri, 15 Nov 2013 19:47:50 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Mark Rutland <mark.rutland@....com>
Cc:	Marek Belisko <marek@...delico.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"neilb@...e.de" <neilb@...e.de>,
	"hns@...delico.com" <hns@...delico.com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Pawel Moll <Pawel.Moll@....com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"rob@...dley.net" <rob@...dley.net>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] misc: bmp085: Add DT bindings for EOC gpio line and direct irq.

On Friday 15 November 2013, Mark Rutland wrote:
> There's some contention over the description of gpio-based IRQs in DT.
> From the point of view of the device there is a logical IRQ output; the
> fact that this happens to be wired up to a GPIO pin that can happen to
> generate interrupts isn't anything to do with the device itself. There
> are plenty of device we have now whose interrupt lines could be wired to
> GPIOs. I see no reason to extend their bindings to support explicit
> GPIOs for IRQs, and I see no reason the driver should have to handle
> this.
> 
> It would be far nicer for the device binding to just have the interrupts
> property, and for the gpio controller to act as an interrupt-controller,
> with the appropriate pin management.

Yes, agreed. I missed this point in my review: the GPIO is used only
as an interrupt pin here, so there is no reason to know the GPIO number.

	Arnd
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