linux-kernel - Re: [RFC][PATCH 2/2] hwmon: (w83627ehf) Add GPIO port 3 functionality

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Message-ID: <20120114211856.7e1b816d@endymion.delvare>
Date:	Sat, 14 Jan 2012 21:18:56 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	Alex Rio <scasbyte@...il.com>
Cc:	guenter.roeck@...csson.com, linux-kernel@...r.kernel.org,
	Rodolfo Giometti <giometti@...ux.it>
Subject: Re: [RFC][PATCH 2/2] hwmon: (w83627ehf) Add GPIO port 3
 functionality

On Fri, 13 Jan 2012 19:39:56 -0600, Alex Rio wrote:
> The w83627ehf chip has 5 GPIO ports, currently none of them is supported.
> This patch adds the GPIO port 3 driver with the following functions:
> set/get pin values, direction_in/out, set_debounce.
> The values are also available to the userspace (if requiered)
> in the path /sys/class/gpio by using the export/unexport functions.
> Please look at the REVISIT comment, this is the main reason of the RFC,
> suggestions will be highly appreciated.
> 
> Signed-off-by: Alex Rio <scasbyte@...il.com>
> ---
>  drivers/hwmon/w83627ehf.c |  188 +++++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 188 insertions(+), 0 deletions(-)

This is calling for a MFD driver for these chips. This was proposed in
the past, BTW, but never followed up:
http://lists.lm-sensors.org/pipermail/lm-sensors/2010-February/027795.html

Putting everything in the current driver is not going to be accepted.
It certainly looks pleasant because it's a more simple approach, but
the result would be a complex and unmaintainable driver.

-- 
Jean Delvare
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