linux-kernel - Re: [PATCH v4 4/4] ASoC: samsung: Add machine driver for Exynos5433 based TM2 board

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Date:	Mon, 18 Jul 2016 12:41:37 +0200
From:	Sylwester Nawrocki <s.nawrocki@...sung.com>
To:	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	broonie@...nel.org, robh@...nel.org, alsa-devel@...a-project.org,
	devicetree@...r.kernel.org, ideal.song@...sung.com,
	inki.dae@...sung.com, b.zolnierkie@...sung.com,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Subject: Re: [PATCH v4 4/4] ASoC: samsung: Add machine driver for Exynos5433
 based TM2 board

Hi Chanwoo,

On 07/15/2016 07:18 AM, Chanwoo Choi wrote:
>> +static int tm2_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;

>> +	codec_dai_node = of_parse_phandle(dev->of_node, "audio-codec", 0);
>> +	if (!codec_dai_node) {
>> +		dev_err(dev, "audio-codec property invalid or missing\n");
>> +		ret = -EINVAL;
>> +		goto err_put_cpu_dai;
>> +	}

>> +	priv->codec_mclk1 = of_clk_get_by_name(codec_dai_node, "mclk1");
>> +	if (IS_ERR(priv->codec_mclk1)) {
>> +		dev_err(dev, "Failed to get mclk1 clock\n");
>> +		ret = PTR_ERR(priv->codec_mclk1);
>> +		goto err_put_codec_dai;
>> +	}
> 
> I think that you better to use the devm_clk_get() instead of of_clk_get_by_name()
> because you don't need to handle the clk_put() when error happen and remove the 
> this driver.
> 
> 	priv->codec_mclk1 = devm_clk_get(dev, "mclk1");

The clocks are from the CODEC DT node, for which we don't have struct
device pointer here, that's why I used of_clk_get_by_name().

--
Thanks,
Sylwester