linux-kernel - Re: [PATCH 6/8] minnowboard-keys: Bind MinnowBoard buttons to arrow keys

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Date:	Wed, 26 Jun 2013 09:28:07 -0700
From:	Darren Hart <dvhart@...ux.intel.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Olof Johansson <olof@...om.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, peter.p.waskiewicz.jr@...el.com,
	danders@...cuitco.com, vishal.l.verma@...el.com,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Grant Likely <grant.likely@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH 6/8] minnowboard-keys: Bind MinnowBoard buttons to arrow
 keys

On Wed, 2013-06-26 at 11:46 +0300, Andy Shevchenko wrote:
> On Tue, 2013-06-25 at 18:53 -0700, Darren Hart wrote: 
> > Configure the four buttons tied to the E6XX GPIO lines on the
> > MinnowBoard as keys using the gpio-keys-polled platform driver. From
> > left to right, bind them to LEFT, DOWN, UP, RIGHT, similar to the VI
> > directional keys.
> > 
> > This is separate from the minnowboard driver to provide users with the
> > flexibility to write kernel drivers for their own devices using these GPIO
> > lines.
> 
> I'm repeating my comment I did early to you.
> 
> I think this driver is a wrong approach, since you just use
> gpio_keys_polling with custom platform data. So, it should go to the
> platform code / board file under arch/x86/platform/minnow/...


Olof mentinoed something similar. The reason this is separate is that I
can easily see someone wanting to use these buttons in a different way
when integrating the MinnowBoard into some kind of product. The
minnowboard.c driver sets up the fixed functionality GPIO lines, such as
the LEDs (which can be easily reconfigured via triggers) while this
driver serves as an example of how the GPIO buttons could be used as
keys, but if included in the minnowboard driver, users couldn't get the
fixed functionality without also tying up these GPIO lines.

I could remedy that with driver command-line options, but I know I've
heard Greg KH discourage their use in the past.

Does that address your concern or do you still feel they should be
merged?

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Technical Lead - Linux Kernel

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