linux-kernel - Re: [PATCHv2 1/3] Input: twl4030-keypad

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Date:	Tue, 29 Oct 2013 03:33:31 -0500
From:	Kumar Gala <galak@...eaurora.org>
To:	Sebastian Reichel <sre@...ian.org>
Cc:	linux-input@...r.kernel.org,
	"'Benoît Cousson'" 
	<bcousson@...libre.com>, Tony Lindgren <tony@...mide.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org
Subject: Re: [PATCHv2 1/3] Input: twl4030-keypad - add device tree support


On Oct 28, 2013, at 8:06 PM, Sebastian Reichel wrote:

> On Mon, Oct 28, 2013 at 01:42:47AM -0500, Kumar Gala wrote:
>>> +This binding is based on the matrix-keymap binding with the following
>>> +changes:
>> 
>> Maybe be a bit more specific and say 'based on the input/matrix-keymap.txt binding'..
> 
> OK.
> 
>>> + * keypad,num-rows and keypad,num-columns are required.
>> 
>> Is linux,keymap required from matrix-keymap.txt?
> 
> Yes, matrix-keymap.txt contains descriptions for the following:
> 
> required:
> - linux,keymap

So you don't say that linux,keymap is required for twl4030-keypad (wasn't clear if you assumed that or not).

> optional:
> - keypad,num-rows
> - keypad,num-columns
> 
>>> +Optional Properties specific to linux:
>>> +- linux,keypad-no-autorepeat: do no enable autorepeat feature.
>> 
>> Does it make sense to update the matrix-keymap.txt binding to add
>> 'linux,keypad-no-autorepeat' there?
> 
> At least according to devicetree documentation there are
> keymap-matrix.txt based drivers, which do not support
> "linux,keypad-no-autorepeat".

Which is why it could be optional in keymap-matrix.txt.  I dont know anything about keymap/keypad's just asking the question?

It seems as if linux,keypad-no-autorepeat is intended to mean the same thing (if relevant to the device) across all drivers.  Is that correct?  If so it seems like moving it to be specified in a generic input binding makes sense, just not sure if keymap-matrix.txt is that place or not.

- k
-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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