linux-kernel - Re: [PATCH V1] ASoC: fsl_ssi: refine ipg clock usage in this module

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Date:	Tue, 09 Sep 2014 15:03:53 -0500
From:	Timur Tabi <timur@...i.org>
To:	Nicolin Chen <nicoleotsuka@...il.com>
CC:	Shengjiu Wang <shengjiu.wang@...escale.com>,
	Li.Xiubo@...escale.com, lgirdwood@...il.com, broonie@...nel.org,
	perex@...ex.cz, tiwai@...e.de, alsa-devel@...a-project.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	mpa@...gutronix.de
Subject: Re: [PATCH V1] ASoC: fsl_ssi: refine ipg clock usage in this module

On 09/09/2014 02:59 PM, Nicolin Chen wrote:
> +	/*
> +	 * Initially mark the clock to NULL for all platforms so that later
> +	 * clk_prepare_enable() will ignore and return 0 for non-clock cases.
> +	 */
> +	ssi_private->clk = NULL;

According to Mark, NULL is a valid clock, so this should be instead:

	ssi_private->clk = PTR_ERR(-EINVAL);

although that doesn't sit well with me.
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