linux-kernel - Re: power: Add simple poweroff-gpio driver

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Date:	Fri, 14 Dec 2012 09:21:50 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jamie Lentin <jm@...tin.co.uk>, Andrew Lunn <andrew@...n.ch>,
	Simon Baatz <gmbnomis@...il.com>,
	Jason Cooper <jason@...edaemon.net>
Subject: Re: power: Add simple poweroff-gpio driver

On Thu, Dec 13, 2012 at 03:51:59PM -0500, Dave Jones wrote:
> On Thu, Dec 13, 2012 at 08:21:57PM +0000, Linux Kernel wrote:
>  > Gitweb:     http://git.kernel.org/linus/;a=commit;h=96ff0f5c7efd4a2205c48a76a6a1fcd2731e6128
>  > Commit:     96ff0f5c7efd4a2205c48a76a6a1fcd2731e6128
>  > Parent:     f4a00139b7cbeff538e616a21f6b57249a9d3ed8
>  > Author:     Jamie Lentin <jm@...tin.co.uk>
>  > AuthorDate: Sat Nov 17 09:51:04 2012 +0100
>  > Committer:  Jason Cooper <jason@...edaemon.net>
>  > CommitDate: Sat Nov 24 02:56:38 2012 +0000
>  > 
>  >     power: Add simple poweroff-gpio driver
>  >     
>  >     Given appropriate devicetree bindings, this driver registers a
>  >     pm_power_off function to set a GPIO line high/low to power down
>  >     your board.
> 
> Given this seems to be dependant on device-tree, shouldn't there be
> some 'depends on' in the kconfig to prevent this showing up on architectures
> that don't implement it ? 
> 
>  > +menuconfig POWER_RESET
>  > +	bool "Board level reset or power off"
>  > +	help
>  > +	  Provides a number of drivers which either reset a complete board
>  > +	  or shut it down, by manipulating the main power supply on the board.
>  > +
>  > +	  Say Y here to enable board reset and power off
>  > +
>  > +config POWER_RESET_GPIO
>  > +	bool "GPIO power-off driver"
>  > +	depends on OF_GPIO && POWER_RESET

Hi Dave

Don't these depends on here do what you want?

>  > +	help
>  > +	  This driver supports turning off your board via a GPIO line.
>  > +	  If your board needs a GPIO high/low to power down, say Y and
>  > +	  create a binding in your devicetree.
> 
> If not, upon seeing this, I suspect many users will ask "how do I know if I need this?"
> given there's no mention of the sort of hardware this is useful on.

Its a generic driver. I know its useful on various Marvell kirkwood
and orion5x devices. I've also heard it useful on some Tegra boards.

Are you asking i list these boards?

    Thanks
	Andrew
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