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

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Message-Id: <201311181238.40349.arnd@arndb.de>
Date:	Mon, 18 Nov 2013 12:38:40 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Belisko Marek <marek.belisko@...il.com>
Cc:	Mark Rutland <mark.rutland@....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 Monday 18 November 2013, Belisko Marek wrote:

> > 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.
> OK. Can you please give me some example in current bindings tree?
> Something like in:
> Documentation/devicetree/bindings/fb/mxsfb.txt ? So if I understand
> correctly we define only property
> interrupts = <xxx> which will be exact interrupt number for cpu gpio
> connected to bmp085 irq line.
> >

See Documentation/devicetree/bindings/gpio/8xxx_gpio.txt for an example
of a device whose interrupt line is connected to a gpio controller. The
key here is to set the "interrupt-parent" to the gpio node and have
the irq specifier define an interrupt local to that node.

	Arnd
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