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From: Pintu Agarwal <>
To: Kernelnewbies <>,
	 open list <>,,
Subject: Re: Generic way for verifying GPIO wakeup capability
Date: Wed, 10 Jun 2020 23:28:47 +0530
Message-ID: <> (raw)
In-Reply-To: <>

On Tue, 9 Jun 2020 at 23:06, Pintu Agarwal <> wrote:
> 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
> own.
> Is there any other existing generic mechanism?

Is it possible to achieve this using this new interface ?

And I think another option is to use gpio-keys defined in device-tree.
Will this method work for any wake-capable gpio ?
How to verify this for any arbitrary gpio ?

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-09 17:36 Pintu Agarwal
2020-06-10 17:58 ` Pintu Agarwal [this message]

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