linux-kernel - Re: [PATCH v2 1/3] ARM: dts: Add Peach Pit dts entry for Atmel touchpad

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Date:	Tue, 02 Sep 2014 14:46:55 +0100
From:	Nick Dyer <nick.dyer@...ev.co.uk>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Andreas Färber <afaerber@...e.de>
CC:	Kukjin Kim <kgene.kim@...sung.com>,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olof@...om.net>,
	Yufeng Shen <miletus@...omium.org>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Daniel Stone <daniels@...labora.com>
Subject: Re: [PATCH v2 1/3] ARM: dts: Add Peach Pit dts entry for Atmel touchpad

On 27/08/14 15:22, Javier Martinez Canillas wrote:
>>> If there was a BTN_NONE or KEY_UNUSED it would had been better but I think
>>> that making a distinction between these two cases (reserved pin vs GPIO
>>> available but not used) is useful.
>>
>> Maybe Nick can comment here.

Yes, this is probably useful to document. However, I fear that it's not
going to be obvious what the distinction is to someone who doesn't have the
Atmel docs. Perhaps it would be clearer to just do something like:

		linux,gpio-keymap = <KEY_RESERVED
		                     KEY_RESERVED
		                     KEY_RESERVED /* GPIO0 */
	        	             KEY_RESERVED /* GPIO1 */
		                     KEY_RESERVED /* GPIO2 */
		                     BTN_LEFT>;   /* GPIO3 */

If you omit any trailing KEY_RESERVED values it doesn't affect anything.

I was also going to suggest that you put something like "/* Atmel mXT224SL
*/" in your .dts file so it's clear what version of the maXTouch device you
are configuring.
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