linux-kernel - Re: [alsa-devel] [PATCH v2] ASoC: wm8962: Let CODEC driver enable and disable its own MCLK

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Message-ID: <20140729101950.GB5495@MrMyself>
Date:	Tue, 29 Jul 2014 18:19:51 +0800
From:	Nicolin Chen <Guangyu.Chen@...escale.com>
To:	Mark Brown <broonie@...nel.org>
CC:	Fabio Estevam <festevam@...il.com>,
	Nicolin Chen <nicoleotsuka@...il.com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	<patches@...nsource.wolfsonmicro.com>, <b02247@...escale.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Nicolin Chen <b42378@...escale.com>
Subject: Re: [alsa-devel] [PATCH v2] ASoC: wm8962: Let CODEC driver enable
 and disable its own MCLK

On Tue, Jul 29, 2014 at 10:52:03AM +0100, Mark Brown wrote:
> On Tue, Jul 29, 2014 at 10:55:19AM +0800, Nicolin Chen wrote:
> > On Mon, Jul 28, 2014 at 03:19:43PM -0300, Fabio Estevam wrote:
> 
> > > >> +     pdata->mclk = devm_clk_get(&i2c->dev, NULL);
> 
> > > > This is broken for deferred probe.
> 
> > Sorry. I don't get why deferred probe would be broken by this.
> > And I just took a test by adding this:
> 
> I don't see the code that actually pays attention to the return value
> from devm_clk_get() - in the main probe function the code just treats
> all errors as a missing MCLK.

Just checked the clk_get() code and got the point.

I will add a check to it and return for EPROBE_DEFER.

Thank you,
Nicolin
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