linux-kernel - Re: [PATCH] dts: cubox: Map gpio-keys and pps-gpio to gpio3 8

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Date:	Mon, 16 Mar 2015 20:50:04 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	George Joseph <george.joseph@...rview5.com>
Cc:	Shawn Guo <shawn.guo@...aro.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dts: cubox: Map gpio-keys and pps-gpio to gpio3 8

On Mon, Mar 16, 2015 at 02:36:41PM -0600, George Joseph wrote:
> The Cubox has a recessed button between the HDMI and RJ-45 connectors
> that wasn't mapped in the device tree.  Since the button is normally
> open and there's no external pull up/down, that pad (EIM_DA8) can be
> used for almost anything so I've mapped it to gpio-keys BTN_0 and
> pps-gpio.  Whichever driver claims it first wins.  If both drivers
> are build as modules, you can even switch between them at run time
> and the pinmux will adjust the pin configuration as required.
> If neither driver claims the gpio, it's still available in the normal
> gpio sysfs.

I wonder why we want to have the PPS support in mainline, given that
you would need to solder to the board to make use of that.  I can see
the point of the gpio-keys going into mainline, but not the PPS bit.
That's more like a local hack.

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