linux-kernel - Re: [alsa-devel] [PATCH v3 4/4] ASoC: simple-card: Add DT documentation for multi-DAI links

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Message-ID: <20140319192157.GW11706@sirena.org.uk>
Date:	Wed, 19 Mar 2014 19:21:57 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Jyri Sarha <jsarha@...com>
Cc:	Lars-Peter Clausen <lars@...afoo.de>,
	Jean-Francois Moine <moinejf@...e.fr>,
	<devicetree@...r.kernel.org>, <alsa-devel@...a-project.org>,
	Xiubo Li <Li.Xiubo@...escale.com>,
	<linux-kernel@...r.kernel.org>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Subject: Re: [alsa-devel] [PATCH v3 4/4] ASoC: simple-card: Add DT
 documentation for multi-DAI links

On Wed, Mar 19, 2014 at 09:15:14PM +0200, Jyri Sarha wrote:
> On 03/19/2014 08:51 PM, Lars-Peter Clausen wrote:

> >When does this make sense? Either the bitclock is inverted for all of
> >them or for none.

> Definition of clock signal and it's inversion varies between chip
> manufacturers and sometimes it may not be possible to get all the dai
> drivers to work identically in this respect. Because of this in some cases
> there may be a need to set the inversion bit only at one end of the link.

No, Linux has a definition of all the clock modes which applies to all
devices regardless of what the manufacturer documents in their
datasheet.

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