linux-kernel - Re: [PATCH v4] mfd: syscon: Add non-DT support

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Message-ID: <20130222092428.GA27937@avionic-0098.mockup.avionic-design.de>
Date:	Fri, 22 Feb 2013 10:24:29 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Dong Aisheng <b29396@...escale.com>
Cc:	Alexander Shiyan <shc_work@...l.ru>, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	Dong Aisheng <dong.aisheng@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	gregkh@...uxfoundation.org
Subject: Re: [PATCH v4] mfd: syscon: Add non-DT support

On Fri, Feb 22, 2013 at 05:20:56PM +0800, Dong Aisheng wrote:
> On Fri, Feb 22, 2013 at 09:52:12AM +0100, Thierry Reding wrote:
> > On Fri, Feb 22, 2013 at 04:29:55PM +0800, Dong Aisheng wrote:
> > > On Fri, Feb 22, 2013 at 08:27:19AM +0100, Thierry Reding wrote:
> > > ...
> > > > > > > Otherwise, i'm also ok with this patch.
> > > > > > > Acked-by: Dong Aisheng <dong.aisheng@...aro.org>
> > > > > > > 
> > > > > > > BTW, i did not see Samuel's tree having this new API.
> > > > > > > So, who will pick this patch?
> > > > > > 
> > > > > > I have same question.
> > > > > 
> > > > > I CCed Thierry and Greg who may know it.
> > > > 
> > > > Yes, devm_ioremap_resource() never returns NULL. You always need to
> > > > check the returned pointer with IS_ERR(). The value that you return
> > > > should be extracted from the pointer with PTR_ERR().
> > > 
> > > Thanks Thierry.
> > > Since Samuel's mdf tree does not have your patch introducing
> > > the new API of devm_ioremap_resource,
> > > do you know which tree this patch can go through, Greg's driver core tree?
> > 
> > I don't think it matters much at this point because Linus merged the
> > driver core tree yesterday, so anything that gets applied now should
> > automatically have the new API available.
> > 
> I just tried update to latest linus tree, still did not find this API defined
> in include/linux/io.h.
> Would you mind point it out for me?

Commit 75096579c3ac39ddc2f8b0d9a8924eba31f4d920 introduced it. The
prototype is in include/linux/device.h and the implementation in
lib/devres.c.

Thierry

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