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

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Date:	Sun, 27 Oct 2013 17:31:27 +0100
From:	Sebastian Reichel <sre@...g0.de>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Pavel Machek <pavel@....cz>, linux-input@...r.kernel.org,
	"'Beno?t Cousson'" <bcousson@...libre.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 Sun, Oct 27, 2013 at 05:23:48AM -0700, Tony Lindgren wrote:
> * Pavel Machek <pavel@....cz> [131027 04:48]:
> > > > > +#if IS_ENABLED(CONFIG_OF)
> > > > I'm probably missing something here, but why not #ifdef CONFIG_OF?
> > > 
> > > I have been told for other drivers, that IS_ENABLED() is
> > > the prefered way to check for configuration these days.
> > 
> > CONFIG_OF can not be module, using IS_ENABLED() on it is just wrong.
> 
> Good point. Looks like there's IS_BUILTIN that's for boolean options.

Using IS_ENABLED for boolean options is supposed to be supported
according to the comment above IS_BUILTIN:

/*
 * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0
 * otherwise. For boolean options, this is equivalent to
 * IS_ENABLED(CONFIG_FOO).
 */
#define IS_BUILTIN(option) config_enabled(option)

-- Sebastian

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