linux-kernel - Re: [PATCH 4/5 v2] input: tc3589x-keypad: support probing from device tree

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Date:	Tue, 12 Nov 2013 21:40:14 +0100
From:	Sebastian Reichel <sre@...g0.de>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH 4/5 v2] input: tc3589x-keypad: support probing from
 device tree

On Tue, Nov 12, 2013 at 09:11:40PM +0100, Linus Walleij wrote:
> > I could find two boards using "gpio-matrix-keypad" in the mainline
> > kernel and not a single instance of "linux,no-autorepeat":
> 
> In things connected to GPIO, I don't expect the in-kernel
> device trees to be a good way so survey the usage of these
> bindings. Anyone doing device trees on any system with a
> few GPIOs can be using this.
> 
> But maybe we're lucky and won't break anyone's setup if
> we change this?

AFAIK Device Tree property names are considered as ABI, so existing
property names must not be removed.

But I guess we can add the standardized property name in addition
to the deprecated one. New drivers can use the standardized property
name from the beginning.

Thus I guess we should not use the name, which has the most adopters
in kernel (or out of kernel). Instead the most fitting name should
be used. Current suggestions (taken from kernel) are:

* <<vendor>>,no-autorepeat
* keypad,autorepeat
* linux,keypad-no-autorepeat
* linux,input-no-autorepeat
* linux,no-autorepeat
* autorepeat

I do not really care, which one is chosen, except for two things:

* <<vendor>> seems wrong. This is not vendor specific.
* I would prefer "input-" over "keypad-", since then the same name
  can be used for single keys, buttons, etc.

-- Sebastian

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