linux-kernel - Re: [PATCH 2.6.24-rc5-mm 3/3] gpiolib: obsolete drivers/i2c/chips/pca9539.c

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Date:	Wed, 19 Dec 2007 10:01:01 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	"eric miao" <eric.y.miao@...il.com>
Cc:	"David Brownell" <david-b@...bell.net>,
	linux-kernel@...r.kernel.org, i2c@...sensors.org,
	bgardner@...tec.com
Subject: Re: [PATCH 2.6.24-rc5-mm 3/3] gpiolib: obsolete
 drivers/i2c/chips/pca9539.c

Hi Eric,

On Wed, 19 Dec 2007 16:45:00 +0800, eric miao wrote:
> Updated as follows, the driver name is left unchanged, while
> Kconfig and Documentation are modified so that
> 1. mark it as deprecated
> 2. exclusive selection of SENSOR_PCA9539 and GPIO_PCA9539
> 
> From c58dc1119355dc94d80763aef9d9bc999abda6df Mon Sep 17 00:00:00 2001
> From: eric miao <eric.miao@...vell.com>
> Date: Wed, 19 Dec 2007 16:40:04 +0800
> Subject: [PATCH] gpiolib: mark drivers/i2c/chips/pca9539.c as deprecated
> 
> use drivers/gpio/pca9539.c instead.
> 
> Signed-off-by: eric miao <eric.miao@...vell.com>
> Acked-by: Ben Gardner <bgardner@...tec.com>
> ---
>  Documentation/i2c/chips/pca9539 |    3 +++
>  drivers/i2c/chips/Kconfig       |    7 +++++--
>  2 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/i2c/chips/pca9539 b/Documentation/i2c/chips/pca9539
> index c4fce6a..1d81c53 100644
> --- a/Documentation/i2c/chips/pca9539
> +++ b/Documentation/i2c/chips/pca9539
> @@ -1,6 +1,9 @@
>  Kernel driver pca9539
>  =====================
> 
> +NOTE: this driver is deprecated and will be dropped soon, use
> +drivers/gpio/pca9539.c instead.
> +
>  Supported chips:
>    * Philips PCA9539
>      Prefix: 'pca9539'
> diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig
> index 2e1c24f..54fd302 100644
> --- a/drivers/i2c/chips/Kconfig
> +++ b/drivers/i2c/chips/Kconfig
> @@ -66,8 +66,8 @@ config SENSORS_PCF8574
>  	  hardware.  If unsure, say N.
> 
>  config SENSORS_PCA9539
> -	tristate "Philips PCA9539 16-bit I/O port"
> -	depends on EXPERIMENTAL
> +	tristate "Philips PCA9539 16-bit I/O port (DEPRECATED)"
> +	depends on EXPERIMENTAL && !GPIO_PCA9539

If I remember correctly how the Kconfig language works, this will allow
for both drivers to be built as modules at the same time. Given that
they have the same name, which one will be loaded by "modprobe
pca9539"? I think that you should instead express the dependency as
"GPIO_PCA9539=n".

>  	help
>  	  If you say yes here you get support for the Philips PCA9539
>  	  16-bit I/O port.
> @@ -75,6 +75,9 @@ config SENSORS_PCA9539
>  	  This driver can also be built as a module.  If so, the module
>  	  will be called pca9539.
> 
> +	  This driver is deprecated and will be dropped soon. Use
> +	  drivers/gpio/pca9539.c instead.
> +
>  config SENSORS_PCF8591
>  	tristate "Philips PCF8591"
>  	depends on EXPERIMENTAL

Other than that I'm fine with this approach, note however that it will
have to go through David rather than me, as I can't merge this before
the new pca9539 driver.

Thanks,
-- 
Jean Delvare
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