linux-kernel - Re: [PATCH v5 1/7] sound: codec: wm8731: add rates constraints

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Message-ID: <20130712114551.GD24508@sirena.org.uk>
Date:	Fri, 12 Jul 2013 12:45:51 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Richard Genoud <richard.genoud@...il.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Bo Shen <voice.shen@...el.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org, devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH v5 1/7] sound: codec: wm8731: add rates constraints

On Thu, Jul 11, 2013 at 06:15:53PM +0200, Richard Genoud wrote:

Please always try to use commit logs that look like normal commit logs
for the subsystem.

>  	switch (freq) {
> -	case 11289600:
>  	case 12000000:
> +		wm8731->constraints = &wm8731_constraints_12000000;
> +		break;
>  	case 12288000:
> -	case 16934400:
>  	case 18432000:
> -		wm8731->sysclk = freq;
> +		wm8731->constraints = &wm8731_constraints_12288000_18432000;
> +		break;
> +	case 16934400:
> +	case 11289600:
> +		wm8731->constraints = &wm8731_constraints_11289600_16934400;
>  		break;
>  	default:
>  		return -EINVAL;
>  	}

This isn't going to work with systems which have a variable clock as the
input to the CODEC.  If it's imposing constraints the driver needs to
allow setting the clock to zero as a way of removing constraints (and
any existing drivers should be updated to do this if needed).

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