Re: [PATCH v1 1/2] iio:iio-interrupt-trigger: device-tree support

[Gregor Boirie <gregor.boirie-ITF29qwbsa/QT0dZR+AlfA@public.gmane.org>]

On 02/22/2016 08:05 PM, Rob Herring wrote:
> On Sun, Feb 21, 2016 at 07:55:24PM +0000, Jonathan Cameron wrote:
>> On 19/02/16 19:18, Gregor Boirie wrote:
>>> From: Grégor Boirie <gregor.boirie-ITF29qwbsa/QT0dZR+AlfA@public.gmane.org>
>>>
>>> Signed-off-by: Gregor Boirie <gregor.boirie-ITF29qwbsa/QT0dZR+AlfA@public.gmane.org>
>> Snag here is that iio_interrupt_trigger is a very linux specific
>> name and device tree bindings should be just about the hardware.
>>
>> Not entirely sure how we avoid this though as the use is rather
>> hard to describe generically.
>>
>> cc'd device tree list and bindings maintainers.
>>
>> As a brief summary - this IIO trigger driver takes a generic
>> interrupt (from whatever) and uses it to drive sampling of IIO devices.
>> The interrupt might be associated with particularly simple sensors directly
>> but is more commonly a gpio interrupt line used cause samples to be captured
>> from unrelated devices.  Sometimes the source of that interrupt can be a convoluted
>> external mux setup over which linux has no control for example.
> If linux has no control of the setup, then do we care? It's just some
> blackbox driving a signal.
>
>> Any suggestions on appropriate naming?
> I would think of it outside of IIO perhaps. We already have gpio-keys
> which is kind of similar. Maybe just "external interrupt"? Is it always
> a GPIO interrupt or could be polled GPIO or some other mechanism?
Our setup uses an ARM software generated interrupt coming from an 
alternate core
running a custom OS. Usage is however quite similar to GPIO irqs.

[snip]

Grégor.