linux-kernel - Re: [PATCH 2/5] mfd: arizona: Add device tree binding for max_channels

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Date:	Tue, 24 Sep 2013 00:28:32 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
	lee.jones@...aro.org, sameo@...ux.intel.com,
	rob.herring@...xeda.com, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, rob@...dley.net,
	patches@...nsource.wolfsonmicro.com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] mfd: arizona: Add device tree binding for
 max_channels_clocked

On Mon, Sep 23, 2013 at 03:38:10PM -0600, Stephen Warren wrote:
> On 09/23/2013 12:30 PM, Charles Keepax wrote:

> > +  - wlf,max-channels-clocked : The maximum number of channels to be clocked on
> > +    each AIF, useful for I2S systems with multiple data lines being mastered.
> > +    If specified three cells must supplied one for each AIF, specify zero for
> > +    AIFs that should be handled normally.

> What determines the value of this property? Is it really a definition of
> HW, or some kind of run-time configuration/limit? What goes into each of
> the 3 cells?

It's hardware, it's other devices wired in parallel on the bus that use
the CODEC as a clock master.  Personally I'd have this be set by the
ASoC machine driver so it's invisible from a DT point of view, that's
what it's really a property of.

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