linux-kernel - Re: [PATCH] ASoC: fsl_sai: Add asynchronous mode support

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Message-ID: <20140807094527.GC17528@sirena.org.uk>
Date:	Thu, 7 Aug 2014 10:45:27 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Nicolin Chen <nicoleotsuka@...il.com>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	alsa-devel@...a-project.org, timur@...i.org,
	Li.Xiubo@...escale.com, devicetree@...r.kernel.org,
	galak@...eaurora.org, ijc+devicetree@...lion.org.uk,
	mark.rutland@....com, pawel.moll@....com, robh+dt@...nel.org,
	b42378@...escale.com, b02247@...escale.com
Subject: Re: [PATCH] ASoC: fsl_sai: Add asynchronous mode support

On Tue, Aug 05, 2014 at 03:32:05PM +0800, Nicolin Chen wrote:
> From: Nicolin Chen <Guangyu.Chen@...escale.com>
> 
> SAI supports these operation modes:
> 1) asynchronous mode
>    Both Tx and Rx are set to be asynchronous.
> 2) synchronous mode (Rx sync with Tx)
>    Tx is set to be asynchronous, Rx is set to be synchronous.
> 3) synchronous mode (Tx sync with Rx)
>    Rx is set to be asynchronous, Tx is set to be synchronous.
> 4) synchronous mode (Tx/Rx sync with another SAI's Tx)
> 5) synchronous mode (Tx/Rx sync with another SAI's Rx)

This seems to conflict with something else on my branch - not checked
what.  Can you take a look please?

> +Note:
> +- If both fsl,sai-asynchronous and fsl,sai-synchronous-rx are absent, the
> +  default synchronous mode (sync Rx with Tx) will be used, which means both
> +  transimitter and receiver will send and receive data by following clocks
> +  of transimitter.
> +- fsl,sai-asynchronous will be ignored if fsl,sai-synchronous-rx property is
> +  already present.

Might be worth printing an error here.

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