Using PXA arm board with MAX7319 GPIO expander input
eric.y.miao at gmail.com
Mon Feb 8 20:05:22 EST 2010
On Mon, Feb 8, 2010 at 8:32 PM, Marc Zyngier <maz at misterjones.org> wrote:
>> I just saw that there is indeed no support for irq line handling in this
>> driver. In order to use these lines as input for something like the
>> gpio_keys driver, support for that should be added. I never used this
>> driver and can't say whether it is under active development.
> It should be rather easy to introduce something similar to what I did for
> the pca953x driver (http://patchwork.kernel.org/patch/77418/)
> MAX732x seems a lot saner than PCA953x, as it has at least a hardware
> interrupt mask...
Well, I'd say max732x is a chip of heavy simplification, input/output direction
of each pin is normally hardcoded, depending on the chip model used, there
seems no such interrupt mask registers for SW use really.
> And if you don't know where you're going, any road will take you there...
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