linux-kernel - Re: [PATCH 1/2] include: dt-binding: input: create a DT header defining key codes.

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Date:	Thu, 08 Aug 2013 11:25:27 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Laxman Dewangan <ldewangan@...dia.com>,
	Stephen Warren <swarren@...dia.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <Mark.Rutland@....com>
Subject: Re: [PATCH 1/2] include: dt-binding: input: create a DT header defining
 key codes.

On 08/08/2013 11:13 AM, Dmitry Torokhov wrote:
> On Thu, Aug 08, 2013 at 10:41:20PM +0530, Laxman Dewangan wrote:
>> On Wednesday 07 August 2013 12:58 AM, Stephen Warren wrote:
>>> (CC'ing DT bindings maintainers too, hence quoting a bit of the patch)
>>>
>>> On 08/06/2013 08:12 AM, Laxman Dewangan wrote:
>>>> Many of Key device tree bindings uses the constant number as key code
>>>> which matches with kernel header key code and then comment as follows
>>>> for reference/better readability:
>>>> 	linux,code = <102>; /* KEY_HOME */
>>>>
>>>> Create a DT header which defines all the key code so that DT key bindings
>>>> can use it as follows:
>>>> 	linux,code = <KEY_HOME>;
...
> I am uncomfortable that we are duplicating the whole list of keycodes
> here. Do you think we could split keycodes and other event codes from
> include/uapi/linux/input.h into include/uapi/linux/input-events.h and
> unclude it directly into DTS?

Device tree files can only include headers in include/dt-bindings.
Eventually/soon, all the DT files and the headers in the dt-bindings/
directory will be split out into a separate git tree, which does not
have access to include/uapi, or indeed any other Linux kernel header files.

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