linux-kernel - Re: [PATCH] ASoC: WM8962: Let codec driver enable/disable its MCLK

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Date:   Thu, 23 Mar 2017 21:58:15 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Daniel Baluta <daniel.baluta@...il.com>
Cc:     timur@...i.org, Xiubo.Lee@...il.com, fabio.estevam@....com,
        lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        daniel.baluta@....com, mihai.serban@....com, viorel.suman@....com,
        shengjiu.wang@....com
Subject: Re: [PATCH] ASoC: WM8962: Let codec driver enable/disable its MCLK

On Thu, Mar 23, 2017 at 02:01:50PM +0200, Daniel Baluta wrote:
> From: Nicolin Chen <b42378@...escale.com>
> 
> WM8962 needs its MCLK when powerup in wm8962_resume(). Thus it's better
> to control the MCLK in codec driver. Thus remove the clock enable in
> machine dirver accordingly.
> 
> While at it, get rid of imx_wm8962_remove function since it is now
> empty.
> 
> Signed-off-by: Nicolin Chen <b42378@...escale.com>

Hmm...it'd probably be better to let yourself be the author and remove
my signed-off here. Just got an email deliver failure since that email
address is apparently not available any more.

Thanks
Nicolin

> Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> ---
>  sound/soc/fsl/imx-wm8962.c | 40 ++++++++--------------------------------
>  1 file changed, 8 insertions(+), 32 deletions(-)
> 
> diff --git a/sound/soc/fsl/imx-wm8962.c b/sound/soc/fsl/imx-wm8962.c
> index 1b60958..3d894d9 100644
> --- a/sound/soc/fsl/imx-wm8962.c
> +++ b/sound/soc/fsl/imx-wm8962.c
> @@ -33,7 +33,6 @@ struct imx_wm8962_data {
>  	struct snd_soc_card card;
>  	char codec_dai_name[DAI_NAME_SIZE];
>  	char platform_name[DAI_NAME_SIZE];
> -	struct clk *codec_clk;
>  	unsigned int clk_frequency;
>  };
>  
> @@ -163,6 +162,7 @@ static int imx_wm8962_probe(struct platform_device *pdev)
>  	struct imx_priv *priv = &card_priv;
>  	struct i2c_client *codec_dev;
>  	struct imx_wm8962_data *data;
> +	struct clk *codec_clk;
>  	int int_port, ext_port;
>  	int ret;
>  
> @@ -231,19 +231,14 @@ static int imx_wm8962_probe(struct platform_device *pdev)
>  		goto fail;
>  	}
>  
> -	data->codec_clk = devm_clk_get(&codec_dev->dev, NULL);
> -	if (IS_ERR(data->codec_clk)) {
> -		ret = PTR_ERR(data->codec_clk);
> +	codec_clk = devm_clk_get(&codec_dev->dev, NULL);
> +	if (IS_ERR(codec_clk)) {
> +		ret = PTR_ERR(codec_clk);
>  		dev_err(&codec_dev->dev, "failed to get codec clk: %d\n", ret);
>  		goto fail;
>  	}
>  
> -	data->clk_frequency = clk_get_rate(data->codec_clk);
> -	ret = clk_prepare_enable(data->codec_clk);
> -	if (ret) {
> -		dev_err(&codec_dev->dev, "failed to enable codec clk: %d\n", ret);
> -		goto fail;
> -	}
> +	data->clk_frequency = clk_get_rate(codec_clk);
>  
>  	data->dai.name = "HiFi";
>  	data->dai.stream_name = "HiFi";
> @@ -258,10 +253,10 @@ static int imx_wm8962_probe(struct platform_device *pdev)
>  	data->card.dev = &pdev->dev;
>  	ret = snd_soc_of_parse_card_name(&data->card, "model");
>  	if (ret)
> -		goto clk_fail;
> +		goto fail;
>  	ret = snd_soc_of_parse_audio_routing(&data->card, "audio-routing");
>  	if (ret)
> -		goto clk_fail;
> +		goto fail;
>  	data->card.num_links = 1;
>  	data->card.owner = THIS_MODULE;
>  	data->card.dai_link = &data->dai;
> @@ -277,16 +272,9 @@ static int imx_wm8962_probe(struct platform_device *pdev)
>  	ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
>  	if (ret) {
>  		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
> -		goto clk_fail;
> +		goto fail;
>  	}
>  
> -	of_node_put(ssi_np);
> -	of_node_put(codec_np);
> -
> -	return 0;
> -
> -clk_fail:
> -	clk_disable_unprepare(data->codec_clk);
>  fail:
>  	of_node_put(ssi_np);
>  	of_node_put(codec_np);
> @@ -294,17 +282,6 @@ static int imx_wm8962_probe(struct platform_device *pdev)
>  	return ret;
>  }
>  
> -static int imx_wm8962_remove(struct platform_device *pdev)
> -{
> -	struct snd_soc_card *card = platform_get_drvdata(pdev);
> -	struct imx_wm8962_data *data = snd_soc_card_get_drvdata(card);
> -
> -	if (!IS_ERR(data->codec_clk))
> -		clk_disable_unprepare(data->codec_clk);
> -
> -	return 0;
> -}
> -
>  static const struct of_device_id imx_wm8962_dt_ids[] = {
>  	{ .compatible = "fsl,imx-audio-wm8962", },
>  	{ /* sentinel */ }
> @@ -318,7 +295,6 @@ static struct platform_driver imx_wm8962_driver = {
>  		.of_match_table = imx_wm8962_dt_ids,
>  	},
>  	.probe = imx_wm8962_probe,
> -	.remove = imx_wm8962_remove,
>  };
>  module_platform_driver(imx_wm8962_driver);
>  
> -- 
> 2.7.4
>