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From: Pintu Agarwal <pintu.ping@gmail.com>
To: Kernelnewbies <kernelnewbies@kernelnewbies.org>,
	 open list <linux-kernel@vger.kernel.org>,
	linux-pm@vger.kernel.org,
	 "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
	<linux-arm-kernel@lists.infradead.org>,
	linux-gpio@vger.kernel.org,  zonque@gmail.com,
	sergiosiena@gmail.com
Subject: Re: Generic way for verifying GPIO wakeup capability
Date: Wed, 10 Jun 2020 23:28:47 +0530
Message-ID: <CAOuPNLhQFegohvCx3dD-CtDdYrTSfGrJ1M3ps_YLn4j29x5pFw@mail.gmail.com> (raw)
In-Reply-To: <CAOuPNLj4m_jvs90YpAq5r4gAP9o8Y1Uck3HN+MbsTPb3zP=4eA@mail.gmail.com>

On Tue, 9 Jun 2020 at 23:06, Pintu Agarwal <pintu.ping@gmail.com> 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:
> https://lwn.net/Articles/569027/
>
> 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?
>

https://embeddedbits.org/new-linux-kernel-gpio-user-space-interface/

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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