On Thu, Jan 21, 2016 at 08:05:24AM +0100, Lothar Waßmann wrote:

quoted

On Wed, Jan 20, 2016 at 01:29:51PM +0100, Lothar Waßmann wrote:

quoted

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This pin is used as IRQ pin for the LTC3589 PMIC on the Ka-Ro
electronics TX48 module. Make the IRQ optional in the driver and use a
polling routine instead if no IRQ is specified in DT.
Otherwise the driver will continuously generate interrupts and make
the system unusable.

quoted

How will the driver generate interrupts if there is no interrupt
physically present in the system?

It's using timer interrupts to poll the LTC3589 state.

I know that is what your patch does, my question is why you say in your
commit log that "Otherwise the driver will continuously generate
interrupts and make the system unusable".