From mboxrd@z Thu Jan  1 00:00:00 1970
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
Subject: Re: [PATCH] ASoC: kirkwood: simplify clock handling
Date: Tue, 24 Sep 2013 20:05:34 +0100
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To: Jean-Francois Moine <moinejf@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, alsa-devel@alsa-project.org, Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org>, kernel@pengutronix.de, Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= <u.kleine-koenig@pengutronix.de>, linux-arm-kernel@lists.infradead.org
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On Tue, Sep 24, 2013 at 09:04:42PM +0200, Jean-Francois Moine wrote:
> So, the probe code should be:
> 
> 	/* check first if an external clock is declared */
> 	priv->extclk = devm_clk_get(&pdev->dev, "extclk");
> 	if (!IS_ERR(priv->extclk)) {
> 		... use the external clock ...
> 	} else {
> 
> 		/* get the first clock which must be the dco */
> 		priv->clk = devm_clk_get(&pdev->dev, NULL);
> 		if (IS_ERR(priv->clk))
> 			.. error, no clock ..
> 		.. use the internal dco ...
> 	}

Actually no - we need to get and enable the internal clock so that we can
access the registers - the Dove locks solid if you access the audio block
registers without its internal clock to the audio block enabled.