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* Generic way for verifying GPIO wakeup capability
@ 2020-06-09 17:36 Pintu Agarwal
  2020-06-10 17:58 ` Pintu Agarwal
  0 siblings, 1 reply; 2+ messages in thread
From: Pintu Agarwal @ 2020-06-09 17:36 UTC (permalink / raw)
  To: Kernelnewbies, open list, linux-pm,
	linux-gpio, zonque

Hi All,

I am looking for ways to wakeup any devices (from sleep) using any
arbitrary gpio wakeup method in a generic way (either from user space
or kernel space) that should work on any kernel version (starting from
4.14 onwards).

What are the options available right now ?
I wanted to experiment with all of them and decide which is best for us.

Is /sys/class/gpio/ method still valid with the latest kernel ?
Or is there any other method to do it from user space ?

One option I know is to use enable/disable_irq_wake() API from kernel
driver suspend/resume path.
Just like this:

But this requires an additional kernel driver and device-tree changes
for each gpio wakeup, which the end-user needs to implement on their

Is there any other existing generic mechanism?


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2020-06-09 17:36 Generic way for verifying GPIO wakeup capability Pintu Agarwal
2020-06-10 17:58 ` Pintu Agarwal

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