On 11/25/2015 09:27 AM, Wolfram Sang wrote: > >> I guess you mean that the GPIO callbacks include Runtime PM handling >> however for irq_chip Runtime PM may not be hooked up so the GPIO block >> is in such case is not powered on / get clock enabled? > > Yes. There is another drawback when GPIOs are not properly requested. It > is still possible to request them from userspace although a kernel > driver is using them. I am playing with the idea that the GPIO core > auto-requests GPIOs which are not already requested but still set up as > interrupts. I think the GPIO core already reserves the pins that are requested as IRQs. See gpiochip_lock_as_irq(). As for PM see this discussion http://lkml.iu.edu/hypermail/linux/kernel/1511.1/01645.html - Lars
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