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

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Date:	Wed, 25 Apr 2012 09:48:33 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Sourav Poddar <sourav.poddar@...com>
CC:	devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org, Benoit Cousson <b-cousson@...com>,
	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Felipe Balbi <balbi@...com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Randy Dunlap <rdunlap@...otime.net>
Subject: Re: [PATCHv4 1/2] drivers: input: keypad: Add device tree support

On 04/25/2012 03:26 AM, Sourav Poddar wrote:
> Update the Documentation with omap4 keypad device tree
> binding information.
> Add device tree support for omap4 keypad driver.

> diff --git a/Documentation/devicetree/bindings/input/omap-keypad.txt b/Documentation/devicetree/bindings/input/omap-keypad.txt

> +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.

I'm not sure if "keypad," is the appropriate prefix here. If the
properties are specific to this one TI/OMAP binding, "ti," might be a
better prefix. However, if they're more generally applicable, maybe
"linux," to match "linux,keymap"?

> +Optional Properties specific to linux:
> +- linux,keypad-no-autorepeat: do no enable autorepeat feature.

It's probably worth considering whether num-rows/columns should be part
of matrix-keyboard.txt, and whether linux,keypad-no-autorepeat should be
part of some core keyboard binding. Some of the properties in
tegra-kbc.txt might be worth generalizing too (debounce/repeat delay,
ghost filter)?

> +Example:
> +        keypad@...1c000{
> +                compatible = "ti,omap4-keypad";
> +                keypad,num-rows = <2>;
> +                keypad,num-columns = <8>;
> +		linux,keypad-no-autorepeat;
> +	};
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