linux-kernel - Re: [PATCH] hwmon: (max6650) Add support for gpiodef

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Message-ID: <20131114172427.GA11062@roeck-us.net>
Date:	Thu, 14 Nov 2013 09:24:27 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Laszlo Papp <lpapp@....org>
Cc:	hjk@...sjkoch.de, lm-sensors@...sensors.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (max6650) Add support for gpiodef

On Thu, Nov 14, 2013 at 02:51:01PM +0000, Laszlo Papp wrote:
> It is necessary for end users when they are using the gpio pins connected to the
> fan controller. There is a separate gpiodef register provided, but it is unused
> under the usual circumstances and that is probably the reason why this feature
> has not been added before. It is necessary for our board to function properly.
> 
> Signed-off-by: Laszlo Papp <lpapp@....org>
> ---
>  Documentation/hwmon/max6650 |   5 +++
>  drivers/hwmon/max6650.c     | 107 ++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 112 insertions(+)
> 
> diff --git a/Documentation/hwmon/max6650 b/Documentation/hwmon/max6650
> index 58d9644..32c69a8 100644
> --- a/Documentation/hwmon/max6650
> +++ b/Documentation/hwmon/max6650
> @@ -39,6 +39,11 @@ pwm1		rw	relative speed (0-255), 255=max. speed.
>  fan1_div	rw	sets the speed range the inputs can handle. Legal
>  			values are 1, 2, 4, and 8. Use lower values for
>  			faster fans.
> +gpio0     	rw	sets the gpio 0 PIN. Legal values are 0, 1, 2, and 3.
> +gpio1     	rw	sets the gpio 1 PIN. Legal values are 0, 1, 2, and 3.
> +gpio2     	rw	sets the gpio 2 PIN. Legal values are 0, 1, 2, and 3.
> +gpio3     	rw	sets the gpio 3 PIN. Legal values are 0, and 1.
> +gpio4     	rw	sets the gpio 4 PIN. Legal values are 0, and 1.
>  
gpio pins should be exported through the gpio subsystem, usually with a gpio
driver. In this case, it may be acceptable to have the driver register with
the gpio subsystem to export the pins. Using local sysfs attributes is wrong
and unacceptable.

Guenter
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