linux-kernel - RE: [PATCH] ASoC: simple-card: cleanup asoc_simple_card_parse

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Date:	Tue, 31 Dec 2013 03:27:53 +0000
From:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
To:	Mark Brown <broonie@...nel.org>
CC:	"lgirdwood@...il.com" <lgirdwood@...il.com>,
	"perex@...ex.cz" <perex@...ex.cz>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"kuninori.morimoto.gx@...esas.com" <kuninori.morimoto.gx@...esas.com>,
	"Fabio.Estevam@...escale.com" <Fabio.Estevam@...escale.com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] ASoC: simple-card: cleanup asoc_simple_card_parse_of()
 code


> Subject: Re: [PATCH] ASoC: simple-card: cleanup asoc_simple_card_parse_of()
> code
> 
> On Fri, Dec 27, 2013 at 11:14:38AM +0800, Xiubo Li wrote:
> > Since there is only one common format via "simple-audio-card,format"
> > for simple card driver(CPU & CODEC DAI), there is no need to do the
> > INV mask.
> 
> I don't understand this change, how is the fact that the CPU and CODEC
> DAI share a common format related to using the inversion?  The inversion
> specifies the format relative to the spec rather than relative to the
> other end of the link and for any DAI link the two devices should be
> using the same format.

Also, for most of the devices of the same DAI link, they use the same DAI
formats, but I have found some drivers like : "sound/soc/pxa/magician.c"
and "sound/soc/s6000/s6105-ipcam.c", etc, may have different DAI format
settings for some reasons(maybe some formats are the CPU/Codec devices
default setting that it needn't set it here or others).

I think maybe this is also the reason why the simple-card has common DAI
format and CPU/CODEC private DAI formats at the same time.


Thanks,

--
Best Regards,
Xiubo
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