linux-kernel - Re: [PATCH V2 1/4] i2c: Add irq_gpio field to struct i2c

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Message-ID: <20110901173756.GA13417@sirena.org.uk>
Date:	Thu, 1 Sep 2011 18:37:56 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Stephen Warren <swarren@...dia.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Jean Delvare <khali@...ux-fr.org>,
	Ben Dooks <ben-linux@...ff.org>,
	Jonathan Cameron <jic23@....ac.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Russell King <linux@....linux.org.uk>,
	Andrew Chew <achew@...dia.com>, linux-iio@...r.kernel.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH V2 1/4] i2c: Add irq_gpio field to struct i2c_client.

On Thu, Sep 01, 2011 at 10:52:41AM -0600, Stephen Warren wrote:
> Some devices use a single pin as both an IRQ and a GPIO. In that case,
> irq_gpio is the GPIO ID for that pin. Not all drivers use this feature.
> Where they do, and the use of this feature is optional, and the system
> wishes to disable this feature, this field must be explicitly set to a
> defined invalid GPIO ID, such as -1.
> 
> Signed-off-by: Stephen Warren <swarren@...dia.com>

SPI could also benefit from this.
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