linux-kernel - Re: [PATCH V2 3/3] ASoC: fsl_asrc: spba clock is needed by asrc device

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Message-ID: <20151120142946.GA6949@rob-hp-laptop>
Date:	Fri, 20 Nov 2015 08:29:46 -0600
From:	Rob Herring <robh@...nel.org>
To:	Shengjiu Wang <shengjiu.wang@...escale.com>
Cc:	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	timur@...i.org, nicoleotsuka@...il.com, Xiubo.Lee@...il.com,
	lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
	tiwai@...e.com, shawnguo@...nel.org, alsa-devel@...a-project.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH V2 3/3] ASoC: fsl_asrc: spba clock is needed by asrc
 device

On Fri, Nov 20, 2015 at 02:17:53PM +0800, Shengjiu Wang wrote:
> ASRC need to enable the spba clock, when sdma is using share peripheral
> script. In this case, there is two spba master port is used, if don't
> enable the clock, the spba bus will have arbitration issue, which may
> cause read/write wrong data from/to ASRC registers
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@...escale.com>
> ---
>  Documentation/devicetree/bindings/sound/fsl,asrc.txt |  2 ++
>  sound/soc/fsl/fsl_asrc.c                             | 10 ++++++++++
>  sound/soc/fsl/fsl_asrc.h                             |  1 +
>  3 files changed, 13 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/sound/fsl,asrc.txt b/Documentation/devicetree/bindings/sound/fsl,asrc.txt
> index b93362a..d8eeee3 100644
> --- a/Documentation/devicetree/bindings/sound/fsl,asrc.txt
> +++ b/Documentation/devicetree/bindings/sound/fsl,asrc.txt
> @@ -25,6 +25,8 @@ Required properties:
>  	"mem"		  Peripheral access clock to access registers.
>  	"ipg"		  Peripheral clock to driver module.
>  	"asrck_<0-f>"	  Clock sources for input and output clock.
> +	"spba"		  The spba clock is needed when two spba master port
> +			  is used.

I'm assuming the same comments on patch 1 apply to all 3.

Rob
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