[RFC][PATCH] Add interrupt handling capability to pca953x

[Eric Miao]

On Mon, Nov 16, 2009 at 12:55 AM, Marc Zyngier <maz at misterjones.org> wrote:
> Most of the GPIO expanders controlled by the pca953x driver are
> able to report changes on the input pins through an *INT pin.
>
> This patch implements a very basic way for the platform code to
> be alerted when some input changes (both edge detection).
> It can be seen as a poor man irq_chip.
>
> Alternatively, this could be turned into a full-fledged irq_chip,
> though I'm not sure it is worth the complexity.
>

This actually has been submitted to the ML half a years ago along with
the first pca953x patch. I believe David Brownell has comments on
this, though :-)