linux-kernel - Re: [PATCH 2/2] mfd: twl4030: add twl4030-pwrbutton as our child

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Date:	Fri, 27 Feb 2009 15:20:56 -0800
From:	David Brownell <david-b@...bell.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	me@...ipebalbi.com, linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org, felipe.balbi@...ia.com,
	sameo@...nedhand.com
Subject: Re: [PATCH 2/2] mfd: twl4030: add twl4030-pwrbutton as our child

On Friday 27 February 2009, Andrew Morton wrote:
> > > 
> > > What has gone wrong here?
> > 
> > Not much I can see.  It's registering a platform_device,
> > but only if it could be used on this system.
> 
> Again, that all gets fixed if this is done the right way around.  Run
> your probe function.  If the hardware is there, register with the core
> and all the nodes appear.  If the hardware is not present: bale.

Right.  If there's no button hooked up to its "power button"
signal, don't register that "twl4030-pwrbutton" node.


> The design of the whole subsystem appears to be upside down :(

You seem to be missing something.  Is it only the lack of that
tweak Felipe sent?

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