linux-kernel - Re: [alsa-devel] [PATCH v3] ARM: kirkwood: extend the kirkwood i2s driver for DT usage

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Message-ID: <20130723094823.GO9434@pengutronix.de>
Date:	Tue, 23 Jul 2013 11:48:23 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Jean-Francois Moine <moinejf@...e.fr>, alsa-devel@...a-project.org,
	Takashi Iwai <tiwai@...e.de>, linux-kernel@...r.kernel.org,
	Liam Girdwood <lgirdwood@...il.com>,
	Rob Herring <rob.herring@...xeda.com>,
	devicetree-discuss@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: Re: [alsa-devel] [PATCH v3] ARM: kirkwood: extend the kirkwood i2s
 driver for DT usage

On Tue, Jul 23, 2013 at 10:39:50AM +0100, Russell King - ARM Linux wrote:
> On Tue, Jul 23, 2013 at 11:08:20AM +0200, Sascha Hauer wrote:
> > On Tue, Jul 23, 2013 at 09:53:46AM +0100, Russell King - ARM Linux wrote:
> > > On Tue, Jul 23, 2013 at 10:46:15AM +0200, Jean-Francois Moine wrote:
> > > > The kirkwood i2s driver is used without DT in the Kirkwood machine.
> > > > This patch adds a DT compatible definition for use in other Marvell
> > > > machines as the Armada 88AP510 (Dove).
> > > 
> > > Yet again, this illustrates why converting to DT causes backwards
> > > steps in drivers: the conversion of devm_clk_get() to of_clk_get()
> > > necessitates a clk_put().
> > > 
> > > Can someone please provide a devm_of_clk_get() function before we
> > > accept any more patches doing this kind of thing?
> > 
> > The question is why isn't regular [devm_]clk_get used here? I don't know
> > what the Marvell stuff is doing here, but if the clk stuff is
> > implemented correctly then
> > 
> > 	np = pdev->dev.of_node;
> > 	priv->clk = of_clk_get(np, 0);
> > 
> > and
> > 
> > 	devm_clk_get(&pdev->dev, "label");
> > 
> > should both work
> 
> You tell me - I keep seeing patches on this list converting drivers from
> using devm_clk_get() to using of_clk_get().  Maybe of_clk_get() should be
> marked deprecated to stop people using it?

I don't think that's possible. There are some valid usecases for
of_clk_get() when there's no struct device * available, like in many
clocksource drivers.

Sascha

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