linux-kernel - Re: [patch 2.6.24-rc6-mm 8/9] gpiolib: pca9539 i2c gpio expander support

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Date:	Sun, 6 Jan 2008 13:59:45 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	David Brownell <david-b@...bell.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	eric miao <eric.y.miao@...il.com>
Subject: Re: [patch 2.6.24-rc6-mm 8/9] gpiolib: pca9539 i2c gpio expander
 support

On Sat, 5 Jan 2008 11:40:55 -0800, David Brownell wrote:
> From: eric miao <eric.miao@...vell.com>
> Subject: [PATCH] gpiolib: support PCA9539 GPIO expander
> 
> This adds a new-style I2C driver with basic support for the sixteen
> bit PCA9539 GPIO expanders.  These chips have multiple registers,
> push-pull output drivers, and (not supported in this patch) pin
> change interrupts.
> 
> Board-specific code must provide "pca9539_platform_data" with each
> chip's "i2c_board_info".  That provides the GPIO numbers to be used
> by that chip, and callbacks for board-specific setup/teardown logic.
> 
> Derived from drivers/i2c/chips/pca9539.c (which has no current known
> users).  This is faster and simpler; it uses 16-bit register access,
> and cache the OUTPUT and DIRECTION registers for fast access
> 
> Signed-off-by: eric miao <eric.miao@...vell.com>
> Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
> ---
> Incorporates cleanups noted by Jean Delvare.
> 
>  drivers/gpio/Kconfig        |   10 +
>  drivers/gpio/Makefile       |    1 
>  drivers/gpio/pca9539.c      |  271 ++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/i2c/pca9539.h |   18 ++
>  4 files changed, 300 insertions(+)

Acked-by: Jean Delvare <khali@...ux-fr.org>

-- 
Jean Delvare
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