On Wednesday 12 November 2014 17:38:31 Alexander Stein wrote:

On Wednesday 12 November 2014 17:04:57, Arnd Bergmann wrote:

quoted

On Wednesday 12 November 2014 17:02:56 Alexander Stein wrote:

quoted

This features already exists for board config setups. Add support for
device tree based systems.

Signed-off-by: Alexander Stein <redacted>
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Please note: Due to current lack of hardware I could not test it yet. V2
includes the changes proposed by Dmitry.

Changes in v2:
* Added device tree bindings
* IRQ is only parsed and mapped when there is no "gpios" property

Can you list one or more examples in the patch description?
Are these systems that don't expose the GPIO controller with a
standalone driver, or systems that really actually connect the
buttons to an interrupt pin?

You mean a use case? I came to this situation to test interrupt polarity on a microcontroller, thus a simple /IRQ pin, no GPIO at all. So in the end I have an input just connected to an interrupt line.
I noticed gpio_keys using platform data only can be used for this setup. So I added this support for device tree.

I meant a specific board file that uses this, which can't be converted
to DT without your change.

	Arnd