Re: [PATCH 5/6] ASoC: mxs: add device tree support for mxs-sgtl5000

[Dong Aisheng <aisheng.dong@freescale.com>]

On Thu, May 10, 2012 at 04:42:12PM +0800, Shawn Guo wrote:
> Add device tree probe for mxs-sgtl5000 machine driver.
> 
> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Mostly it looks okay to me.
A few comments.

> ---
>  .../bindings/sound/mxs-audio-sgtl5000.txt          |   17 ++++++
>  sound/soc/mxs/mxs-sgtl5000.c                       |   57 ++++++++++++++++++++
>  2 files changed, 74 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/sound/mxs-audio-sgtl5000.txt
> 
> diff --git a/Documentation/devicetree/bindings/sound/mxs-audio-sgtl5000.txt b/Documentation/devicetree/bindings/sound/mxs-audio-sgtl5000.txt
> new file mode 100644
> index 0000000..601c518
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/mxs-audio-sgtl5000.txt
> @@ -0,0 +1,17 @@
> +* Freescale MXS audio complex with SGTL5000 codec
> +
> +Required properties:
> +- compatible: "fsl,mxs-audio-sgtl5000"
> +- model: The user-visible name of this sound complex
> +- saif-controllers: The phandle list of the MXS SAIF controller
> +- audio-codec: The phandle of the SGTL5000 audio codec
> +
> +Example:
> +
> +sound {
> +	compatible = "fsl,imx28-evk-sgtl5000",
> +		     "fsl,mxs-audio-sgtl5000";
> +	model = "imx28-evk-sgtl5000";
> +	saif-controllers = <&saif0 &saif1>;
> +	audio-codec = <&sgtl5000>;
> +};
> diff --git a/sound/soc/mxs/mxs-sgtl5000.c b/sound/soc/mxs/mxs-sgtl5000.c
> index e9e6112..d420f11 100644
> --- a/sound/soc/mxs/mxs-sgtl5000.c
> +++ b/sound/soc/mxs/mxs-sgtl5000.c
> @@ -18,6 +18,8 @@
>  
>  #include <linux/module.h>
>  #include <linux/device.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>  #include <sound/core.h>
>  #include <sound/pcm.h>
>  #include <sound/soc.h>
> @@ -110,11 +112,58 @@ static struct snd_soc_card mxs_sgtl5000 = {
>  	.num_links	= ARRAY_SIZE(mxs_sgtl5000_dai),
>  };
>  
> +static int __devinit mxs_sgtl5000_probe_dt(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct device_node *saif_np[2], *codec_np;
> +	struct platform_device *saif_pdev[2];
> +	int i, ret = 0;
> +
> +	if (!np)
> +		return 1; /* no device tree */
> +
> +	saif_np[0] = of_parse_phandle(np, "saif-controllers", 0);
> +	saif_np[1] = of_parse_phandle(np, "saif-controllers", 1);
> +	codec_np = of_parse_phandle(np, "audio-codec", 0);
> +	if (!saif_np[0] || !saif_np[1] || !codec_np) {
> +		dev_err(&pdev->dev, "phandle missing or invalid\n");
> +		return -EINVAL;
> +	}
...

> +
> +	saif_pdev[0] = of_find_device_by_node(saif_np[0]);
> +	saif_pdev[1] = of_find_device_by_node(saif_np[1]);
> +	if (!saif_pdev[0] || !saif_pdev[1]) {
> +		dev_err(&pdev->dev, "failed to find saif platform device\n");
> +		ret = -EINVAL;
> +		goto out;
> +	}
Do we really need this checking?

> +
> +	for (i = 0; i < 2; i++) {
> +		mxs_sgtl5000_dai[i].codec_name = NULL;
> +		mxs_sgtl5000_dai[i].codec_of_node = codec_np;
> +		mxs_sgtl5000_dai[i].cpu_dai_name = NULL;
> +		mxs_sgtl5000_dai[i].cpu_dai_of_node = saif_np[i];
> +		mxs_sgtl5000_dai[i].platform_name = NULL;
> +		mxs_sgtl5000_dai[i].platform_of_node = saif_np[i];
> +	}
> +
> +out:
> +	of_node_put(codec_np);
> +	of_node_put(saif_np[0]);
> +	of_node_put(saif_np[1]);
> +
> +	return ret;
> +}
> +
>  static int __devinit mxs_sgtl5000_probe(struct platform_device *pdev)
>  {
>  	struct snd_soc_card *card = &mxs_sgtl5000;
>  	int ret;
>  
> +	ret = mxs_sgtl5000_probe_dt(pdev);
> +	if (ret < 0)
> +		return ret;
> +
>  	/*
>  	 * Set an init clock(11.28Mhz) for sgtl5000 initialization(i2c r/w).
>  	 * The Sgtl5000 sysclk is derived from saif0 mclk and it's range
> @@ -127,6 +176,7 @@ static int __devinit mxs_sgtl5000_probe(struct platform_device *pdev)
>  	card->dev = &pdev->dev;
>  	platform_set_drvdata(pdev, card);
>  
> +	card->dev = &pdev->dev;
Repeat assignment?

Regards
Dong Aisheng

>  	ret = snd_soc_register_card(card);
>  	if (ret) {
>  		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n",
> @@ -148,10 +198,17 @@ static int __devexit mxs_sgtl5000_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static const struct of_device_id mxs_sgtl5000_dt_ids[] = {
> +	{ .compatible = "fsl,mxs-audio-sgtl5000", },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, mxs_sgtl5000_dt_ids);
> +
>  static struct platform_driver mxs_sgtl5000_audio_driver = {
>  	.driver = {
>  		.name = "mxs-sgtl5000",
>  		.owner = THIS_MODULE,
> +		.of_match_table = mxs_sgtl5000_dt_ids,
>  	},
>  	.probe = mxs_sgtl5000_probe,
>  	.remove = __devexit_p(mxs_sgtl5000_remove),
> -- 
> 1.7.5.4
> 
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