linux-kernel - Re: [PATCH 2.6.24-rc4-mm 2/2] gpiolib: add Generic IRQ support for 16-bit PCA9539 GPIO expander

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Date:	Mon, 10 Dec 2007 02:14:52 -0800
From:	David Brownell <david-b@...bell.net>
To:	"eric miao" <eric.y.miao@...il.com>
Cc:	"Linux Kernel list" <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.arm.linux.org.uk>,
	i2c@...sensors.org
Subject: Re: [PATCH 2.6.24-rc4-mm 2/2] gpiolib: add Generic IRQ support for 16-bit PCA9539 GPIO expander

On Monday 10 December 2007, eric miao wrote:
> +config GPIO_PCA9539_GENERIC_IRQ
> +       bool "    Generic IRQ support for PCA9539"
> +       depends on GPIO_PCA9539=y

Also depends on GENERIC_HARDIRQS, right?  (You should let
the Kconfig UI handle indentation, too...)

Seems like doing this for an I2C chip ought to shake loose
some interesting review comments.  :)


> +       help
> +         Say yes here to support the Generic IRQ for the PCA9539 on-chip
> +         GPIO lines.

This somewhat resembles the pcf857x chips in that it only support
pin-changed IRQs (IRQ_TYPE_EDGE_BOTH) in hardware.  Some other I/O
expanders are a bit more flexible.

- Dave
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