linux-kernel - Re: [PATCH 1/1] ASoC: McASP: Add device tree binding for defining separate clock and sync used by tx and rx.

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Date:	Tue, 30 Apr 2013 19:40:51 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Marek Belisko <marek.belisko@...il.com>
Cc:	lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.de,
	grant.likely@...retlab.ca, rob.herring@...xeda.com,
	rob@...dley.net, zonque@...il.com,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Marek Belisko <marek.belisko@...eamunlimited.com>
Subject: Re: [PATCH 1/1] ASoC: McASP: Add device tree binding for defining
 separate clock and sync used by tx and rx.

On Tue, Apr 30, 2013 at 12:07:18PM +0200, Marek Belisko wrote:
> Add new property tx-rx-clk-separate which we can distinquish between common
> and separate clock for tx and rx blocks.

So, this is a sensible thing to have and in fact the core already has
the symmetric_rates flag for this.  This says two things to me.  One is
that this patch ought to at least set the symmetric_rates flag so that
the core can tell applications that we can't set different rates in each
direction.  The other is that this probably ought to be a generic
property for dai_links so that we can just set this for any driver -
even if the driver doesn't need to do anything it still matters to the
application layer.

What I'd suggest is adding code to check if symmetric_rates is set for
the DAI link and then key off that and then a generic DT thing (or just
set it in the machine driver for now if that makes sense) to enable that
for your board or boards.
machine driver).

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