Subject: Re: [PATCH v2 02/13] Documentation: mfd: Add DT bindings for i.MX Audiomix

From: Rob Herring <[email-masked]>
Date: Tue, 31 Mar 2020 15:54:56 -0600

On Wed, Mar 25, 2020 at 05:38:40PM +0200, Abel Vesa wrote:
> The i.MX Audiomix is a mix of clock gates, reset bits
> and some other i.MX audio specific functionalities.
> Add information for the MFD, its clock and reset controllers.
> 
> Signed-off-by: Abel Vesa <[email-masked]>
> ---
>  .../devicetree/bindings/mfd/fsl,imx-audiomix.txt   | 34 ++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/fsl,imx-audiomix.txt

Please use DT schema format.
 
> diff --git a/Documentation/devicetree/bindings/mfd/fsl,imx-audiomix.txt b/Documentation/devicetree/bindings/mfd/fsl,imx-audiomix.txt
> new file mode 100644
> index 00000000..1622818
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/fsl,imx-audiomix.txt
> @@ -0,0 +1,34 @@
> +Freescale i.MX Audiomix
> +======================================
> +
> +Audiomix is a conglomerate of different functionalities.
> +
> +Required properties:
> +- compatible: Should be "fsl,<chip>-mix" for the MFD device
> +	Should be"fsl,<chip>-audiomix-clk" for the clock controller
> +	Should be"fsl,<chip>-audiomix-reset" for the reset controller
> +	Some functionalities of the audiomix will be registered as syscon.
> +- reg: should be register base and length as documented in the
> +  datasheet
> +
> +example:
> +	audiomix: audiomix@30e20000 {
> +		compatible = "fsl,imx8mp-mix";
> +		reg = <0x30e20000 0x10000>;
> +
> +		audiomix_clk: clock-controller {
> +			compatible = "fsl,imx8mp-audiomix-clk";
> +			#clock-cells = <1>;
> +			clocks = <&clk IMX8MP_CLK_AUDIO_ROOT>,
> +				 <&clk IMX8MP_CLK_AUDIO_AHB>,
> +				 <&clk IMX8MP_CLK_AUDIO_AXI_DIV>;

None of these clocks are needed for the other functions in this MFD.

I'm not all that convinced that these child nodes are needed. A single 
node can be a clock and reset provider. If you have other things to add 
to the binding, do so now even if you don't have driver support.

> +			clock-names = "audio_root",
> +				      "audio_ahb",
> +				      "audio_axi_div";
> +		};
> +
> +		audiomix_reset: reset-controller {
> +			compatible = "fsl,imx8mp-audiomix-reset";
> +			#reset-cells = <1>;
> +		};
> +	};
> -- 
> 2.7.4
> 

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