trigger question

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Hello, I would like to setup an iio_interrupt_trigger. I see the the
actual request_irq happens in iio_interrupt_trigger_probe. What is a
good example of a driver using this?

I take it that, if I have a GPIO pin setup as an interrupt from
userspace, there is no way to add the trigger from userspace in a way
similar to 'iio_sysfs_trigger/add_trigger'?

Thanks in advance.

-Paul
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