linux-kernel - Re: [REPOST RFC PATCH 0/3] New "gpio-poweroff" driver to turn off platform devices with GPIOs

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Date:	Tue, 13 Dec 2011 13:10:22 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Kyle Moffett <Kyle.D.Moffett@...ing.com>
CC:	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	Liam Girdwood <lrg@...com>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [REPOST RFC PATCH 0/3] New "gpio-poweroff" driver to turn off
 platform devices with GPIOs

On 12/13/2011 12:23 PM, Kyle Moffett wrote:
> Hello again,
> 
> I posted this patch series a few weeks ago and saw no responses, so I
> tweaked the CC list and am reposting it again for review.
> 
> I'm working on support for some custom hardware of ours, and part of
> the support code is the ability for the software to shutdown the power
> supply using GPIOs (via an I2C GPIO controller).
> 
> I previously had this in my platform code, but it seemed generically
> useful, so I split it out into a separate module for others to use.
> 
> The first two patches are generic of_gpio enhancements, providing some
> new library functions for requesting lots of GPIOs at once.
> 
> The third patch is the actual driver itself.  The driver can be used to
> instantiate a platform device as a whole-machine-poweroff device as we
> use it on our hardware.  Alternatively it can instantiate multiple
> platform devs at specific locations on the device tree which trigger
> from the platform_driver->shutdown() callback.
> 
> For architectures which are still stuck in the dark ages, this driver
> also supports being instantiated via legacy platform_data.

Leave them there... :)

> The OpenFirmware binding documentation is added in the third patch.
> Since this is my first cut, it's a little rough, so please be gentle.
> 
> I'm interested to know what you all think.

Does the regulator framework gpio-regulator not work for this?

The DT gpio patches look useful on their own.

Rob
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