linux-kernel - Re: [PATCHv2 3/4] ARM: tegra: use build-in device properties with rfkill

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Message-ID: <3086257.esvHq8Yk9N@wuerfel>
Date:	Tue, 23 Feb 2016 11:31:40 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
	Alexandre Courbot <gnurou@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Marc Dietrich <marvin24@....de>
Subject: Re: [PATCHv2 3/4] ARM: tegra: use build-in device properties with rfkill_gpio

On Tuesday 23 February 2016 11:15:31 Arnd Bergmann wrote:
> On Thursday 18 February 2016 21:04:49 Johannes Berg wrote:
> > On Tue, 2016-01-26 at 09:42 +0100, Johannes Berg wrote:

> Just for my curiosity: what is the difference between a rfkill-gpio
> device and a gpio-keys device with a KEY_RFKILL code?
> 
> arch/arm/boot/dts/bcm4708-netgear-r6250.dts and others seem to
> do the second approach in DT so they don't need to create the
> platform device.

I found the answer now (after discussing on IRC): just
for reference: KEY_RFKILL is for sending the event to the kernel
when a user presses the gpio butting, this rfkill-gpio turns
the devices on or off when after an RFKILL event is received.

	Arnd