linux-kernel - Re: [alsa-devel] [PATCH V2 2/2] ASoC: Davinci: machine: Add device tree binding

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Message-ID: <20130123154804.GB4565@opensource.wolfsonmicro.com>
Date:	Wed, 23 Jan 2013 23:48:12 +0800
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	"Hebbar, Gururaja" <gururaja.hebbar@...com>
Cc:	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"tony@...mide.com" <tony@...mide.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"Nori, Sekhar" <nsekhar@...com>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"rob@...dley.net" <rob@...dley.net>, "Girdwood, Liam" <lrg@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [alsa-devel] [PATCH V2 2/2] ASoC: Davinci: machine: Add device
 tree binding

On Wed, Jan 23, 2013 at 12:39:35PM +0000, Hebbar, Gururaja wrote:
> On Fri, Jan 04, 2013 at 17:56:12, Mark Brown wrote:

> > The CODEC driver biases should be changed over to be supplies, this
> > makes the above much more natural - the routing there is a hack for
> > older versions of ASoc.  Otherwise this looks fine.

> ON TLV320AIC3x Codec, MIC Bias power on/off share the same register bits
> with Bias voltage output.

So you need to use an event to write the actual enable bit.

> SGTL5000 --> Single register for MIC BIAS enable & output impedance of MIC
> Bias. The driver uses SND_SOC_DAPM_POST_PMU & SND_SOC_DAPM_PRE_PMD macro to
> handle the MIC Bias enable & disable event.

This is the way these things should be handled.

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