linux-kernel - Re: [PATCHv2 1/8] ALSA: Add SAI SoC Digital Audio Interface driver.

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Message-ID: <20131101182514.GE2493@sirena.org.uk>
Date:	Fri, 1 Nov 2013 11:25:14 -0700
From:	Mark Brown <broonie@...nel.org>
To:	Xiubo Li <Li.Xiubo@...escale.com>
Cc:	r65073@...escale.com, timur@...i.org, lgirdwood@...il.com,
	r64188@...escale.com, rob.herring@...xeda.com, pawel.moll@....com,
	mark.rutland@....com, swarren@...dotorg.org,
	ian.campbell@...rix.com, rob@...dley.net, linux@....linux.org.uk,
	perex@...ex.cz, tiwai@...e.de, grant.likely@...aro.org,
	fabio.estevam@...escale.com, LW@...O-electronics.de,
	oskar@...ra.com, shawn.guo@...aro.org, b42378@...escale.com,
	b18965@...escale.com, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCHv2 1/8] ALSA: Add SAI SoC Digital Audio Interface driver.

On Fri, Nov 01, 2013 at 03:04:48PM +0800, Xiubo Li wrote:

> +static int fsl_sai_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
> +		int div_id, int div)
> +{
> +	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
> +	u32 tcr2, rcr2;
> +
> +	if (div_id == FSL_SAI_TX_DIV) {
> +		tcr2 = readl(sai->base + FSL_SAI_TCR2);
> +		tcr2 &= ~FSL_SAI_CR2_DIV_MASK;
> +		tcr2 |= FSL_SAI_CR2_DIV(div);
> +		writel(tcr2, sai->base + FSL_SAI_TCR2);

What is this divider and why does the user have to set it manually?

> +	} else
> +		return -EINVAL;
> +

Coding style?

> +static int fsl_sai_dai_probe(struct snd_soc_dai *dai)
> +{
> +	int ret;
> +	struct fsl_sai *sai = dev_get_drvdata(dai->dev);
> +
> +	ret = clk_prepare_enable(sai->clk);
> +	if (ret)
> +		return ret;

It'd be nicer to only enable the clock while the device is in active
use.

> +	ret = snd_dmaengine_pcm_register(&pdev->dev, NULL,
> +			SND_DMAENGINE_PCM_FLAG_NO_RESIDUE);
> +	if (ret)
> +		return ret;

We should have a devm_ version of this.

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