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

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Date:	Tue, 9 Sep 2014 12:59:29 -0700
From:	Nicolin Chen <nicoleotsuka@...il.com>
To:	Timur Tabi <timur@...i.org>
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 Tue, Sep 09, 2014 at 02:37:42PM -0500, Timur Tabi wrote:
> On 09/09/2014 01:38 PM, Nicolin Chen wrote:
> >make sure to have the call for imx only because it seems that
> >the other platforms do not depend on the clock.
> 
> Although I doubt anyone will every add support for clocks to PowerPC "side"
> of this driver, I would prefer to avoid IMX-specific changes. Instead, the
> code should check if a clock is available.  That's why I suggested this
> change:
> 
> -	if (ssi_private->soc->imx)
> +	if (!IS_ERR(ssi_private->clk))

Hmm.... I think the following change may be better?

probe() {
	....
+	/*
+	 * 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;
	.....
	fsl_ssi_imx_probe();
}

In this way, all platforms, not confined to imx any more, will be able
to call clk_prepare_enable(). Then we don't need an extra platform check
before calling it.
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