[PATCH] gpio/mxc: use the edge_sel feature if available

[s.hauer@pengutronix.de (Sascha Hauer)]

On Wed, Jun 20, 2012 at 10:35:21AM +0200, Linus Walleij wrote:
> On Tue, Jun 19, 2012 at 2:00 PM, Beno?t Th?baudeau
> <benoit.thebaudeau@advansee.com> wrote:
> 
> > Can you give me an example
> > that tells me by what you replaced those cpu_is_xxx()? By some feature test
> > macros?
> 
> Since this is a DT-enabled driver, add a boolean attribute for
> the DT node like "has-edge-select" and add that attribute to
> the SoC .dtsi files for the SoCs that has this feature.
> 
> Another (better) option is if there are magic numbers in the
> silicon register range that you can check for revision of that
> hardware in itself. Such auto-detect plug-n-play is always best.

If there would be such a register it would almost certainly be on different
register offsets on different SoCs...

Sascha

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