linux-kernel - Re: [PATCH 4/7] gpiolib: implement dev_gpiochip

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Message-ID: <20081022042022.GB7176@secretlab.ca>
Date:	Tue, 21 Oct 2008 22:20:22 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	avorontsov@...mvista.com, David Brownell <david-b@...bell.net>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	i2c@...sensors.org, Jean Delvare <khali@...ux-fr.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH 4/7] gpiolib: implement dev_gpiochip_{add,remove} calls

On Wed, Oct 22, 2008 at 01:28:17PM +1100, Benjamin Herrenschmidt wrote:
> On Wed, 2008-10-22 at 05:42 +0400, Anton Vorontsov wrote:
> > 
> > Thinking about it more, I started recalling other issues. The bus
> > notifier chain doesn't replay previous events, so we also have to
> > register the notifier before the _devices_ are registered. And this
> > ruins the whole approach. :-/ Yeah, that's why I abandoned the bus
> > notifier idea.
> 
> The notifier can be registered before the devices, though it's a little
> bit fishy and fragile.
> 
> Easier I suppose to just have OF specific hooks in the bus code.

Every time I think about the problem, this is the conclusion that I come
to.  Either have OF specific hooks in the probe/remove functions; or
have separate probe/remove for OF created instances of a device.

g.
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