[1/2] ASoC: fsl_mqs: add DT binding documentation

Add the DT binding documentation for NXP MQS driver

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 .../devicetree/bindings/sound/fsl,mqs.txt     | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/fsl,mqs.txt

Hi Shengjiu,

Your mail is dated in the future, its time is 16:42 (GMT+2) whereas it 
is still the morning.

Please fix your clock or timezone for future mails.

Thanks
Christophe

Le 11/09/2019 à 16:42, Shengjiu Wang a écrit :
> Add the DT binding documentation for NXP MQS driver
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> ---
>   .../devicetree/bindings/sound/fsl,mqs.txt     | 20 +++++++++++++++++++
>   1 file changed, 20 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/sound/fsl,mqs.txt
> 
> diff --git a/Documentation/devicetree/bindings/sound/fsl,mqs.txt b/Documentation/devicetree/bindings/sound/fsl,mqs.txt
> new file mode 100644
> index 000000000000..a1dbe181204a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/fsl,mqs.txt
> @@ -0,0 +1,20 @@
> +fsl,mqs audio CODEC
> +
> +Required properties:
> +
> +  - compatible : Must contain one of "fsl,imx6sx-mqs", "fsl,codec-mqs"
> +		"fsl,imx8qm-mqs", "fsl,imx8qxp-mqs".
> +  - clocks : A list of phandles + clock-specifiers, one for each entry in
> +	     clock-names
> +  - clock-names : Must contain "mclk"
> +  - gpr : The gpr node.
> +
> +Example:
> +
> +mqs: mqs {
> +	compatible = "fsl,imx6sx-mqs";
> +	gpr = <&gpr>;
> +	clocks = <&clks IMX6SX_CLK_SAI1>;
> +	clock-names = "mclk";
> +	status = "disabled";
> +};
>

On Wed, Sep 11, 2019 at 10:42:38AM -0400, Shengjiu Wang wrote:

> +  - gpr : The gpr node.

What is a gpr node?

On Wed, Sep 11, 2019 at 10:42:39AM -0400, Shengjiu Wang wrote:

This looks good, a few minor comments below but nothing major -
it's mostly nits with the DT binding.

> --- /dev/null
> +++ b/sound/soc/fsl/fsl_mqs.c
> @@ -0,0 +1,336 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * ALSA SoC IMX MQS driver
> + *
> + * Copyright (C) 2014-2019 Freescale Semiconductor, Inc.
> + *

Please make the entire comment block a C++ comment so things look
neater.

> +	/* On i.MX6sx the MQS control register is in GPR domain
> +	 * But in i.MX8QM/i.MX8QXP the control register is moved
> +	 * to its own domain.
> +	 */
> +	if (of_device_is_compatible(np, "fsl,imx8qm-mqs"))
> +		mqs_priv->use_gpr = false;
> +	else
> +		mqs_priv->use_gpr = true;

The GPR was listed as a required property in the binding document
but it is only needed here so the binding document should say
"required if compatible is...".

> +	} else {
> +		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +		regs = devm_ioremap_resource(&pdev->dev, res);
> +		if (IS_ERR(regs))

You can use devm_platform_ioremap_resource() here.

> +		mqs_priv->ipg = devm_clk_get(&pdev->dev, "core");
> +		if (IS_ERR(mqs_priv->ipg)) {
> +			dev_err(&pdev->dev, "failed to get the clock: %ld\n",
> +				PTR_ERR(mqs_priv->ipg));
> +			goto out;
> +		}

The core clock wasn't listed in the bindings document.