linux-kernel - Re: [PATCH] ASoC: cs42888: Add codec driver support

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Message-ID: <20140225000027.GI25940@sirena.org.uk>
Date:	Tue, 25 Feb 2014 09:00:27 +0900
From:	Mark Brown <broonie@...nel.org>
To:	Nicolin Chen <Guangyu.Chen@...escale.com>
Cc:	"Austin, Brian" <Brian.Austin@...rus.com>,
	"Handrigan, Paul" <Paul.Handrigan@...rus.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"rob@...dley.net" <rob@...dley.net>,
	Liam Girdwood <lgirdwood@...il.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
Subject: Re: [PATCH] ASoC: cs42888: Add codec driver support

On Tue, Feb 25, 2014 at 12:06:49AM +0800, Nicolin Chen wrote:
> On Mon, Feb 24, 2014 at 03:52:24PM +0000, Austin, Brian wrote:

> Wait...Regarding this clock part, I just forgot the reason I put the code:

> 385         cs42888->clk = devm_clk_get(&i2c->dev, "mclk");
> 386         if (IS_ERR(cs42888->clk))
> 387                 dev_warn(&i2c->dev, "failed to get the clock: %ld\n",
> 388                                 PTR_ERR(cs42888->clk));

> was because the MCLK might be provided from SoC (DAI master) so it could
> be totally controlled by CPU DAI driver, ESAI for example has its own
> dividers to derive the HCKT clock (MCLK for Tx) from ahb clock in SoC
> clock tree, in which case we might not easily pass a valid clock phandle
> via DT. (RFC to this thought.)

We should be getting those clocks visible in the clock API rather than
doing this.

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