linux-kernel - Re: [PATCHv4 1/2] drivers: input: keypad: Add device tree support

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Date:	Wed, 25 Apr 2012 13:38:43 +0200
From:	Roland Stigge <stigge@...com.de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Sourav Poddar <sourav.poddar@...com>,
	devicetree-discuss@...ts.ozlabs.org,
	Benoit Cousson <b-cousson@...com>,
	Stephen Warren <swarren@...dotorg.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Randy Dunlap <rdunlap@...otime.net>,
	Felipe Balbi <balbi@...com>, linux-input@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv4 1/2] drivers: input: keypad: Add device tree support

Hi Russell and Sourav,

On 04/25/2012 12:52 PM, Russell King - ARM Linux wrote:
> I think you and Roland Stigge need to put your heads together and come
> up with a common DT binding for matrix keypad devices, rather than
> inventing N different platform specific bindings.
> 
>> +Required Board Specific Properties, in addition to those specified by
>> +the shared matrix-keyboard bindings:
>> +- keypad,num-rows: Number of row lines connected to the keypad
>> +  controller.
>> +
>> +- keypad,num-columns: Number of column lines connected to the
>> +  keypad controller.

Right - the LPC32xx key scanner always has a square matrix design (#rows
== #cols), but I'm fine with re-using properties "keypad,num-rows" and
"keypad,num-columns" instead of "nxp,matrix-size".

Besides, I still have "nxp,debounce-delay-ms" and "nxp,scan-delay-ms" -
do I need to change this to some default properties I don't know of (yet)?

And: I re-used the DT subnodes strategy for the keycodes ("linux,code")
of the samsung-keypad driver, see
Documentation/devicetree/bindings/input/samsung-keypad.txt - can I
continue using it?

Thanks in advance,

Roland
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