linux-kernel - Re: [PATCH 4/6] arm64: dts: imx8mm-beacon: Enable Digitial Microphone

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Date:   Mon, 18 Jul 2022 07:37:21 +0200
From:   Sascha Hauer <s.hauer@...gutronix.de>
To:     Adam Ford <aford173@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] arm64: dts: imx8mm-beacon: Enable Digitial Microphone

Hi Adam,

On Sun, Jul 17, 2022 at 01:09:58PM -0500, Adam Ford wrote:
> There is a PDM microphone port on the baseboard which is connected to the
> micfil controller.  Create a new sound card to support this interface.
> 
> Signed-off-by: Adam Ford <aford173@...il.com>
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-beacon-baseboard.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-beacon-baseboard.dtsi
> index 03266bd90a06..16444954f873 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-beacon-baseboard.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-beacon-baseboard.dtsi
> @@ -98,7 +98,7 @@ reg_usdhc2_vmmc: regulator-usdhc2 {
>  		enable-active-high;
>  	};
>  
> -	sound {
> +	sound-codec {
>  		compatible = "fsl,imx-audio-wm8962";
>  		model = "wm8962-audio";
>  		audio-cpu = <&sai3>;
> @@ -111,6 +111,18 @@ sound {
>  			"AMIC", "MICBIAS",
>  			"IN3R", "AMIC";
>  	};
> +
> +	sound-micfil {
> +		compatible = "fsl,imx-audio-card";
> +		model = "imx-audio-micfil";
> +		pri-dai-link {
> +			link-name = "micfil hifi";
> +			format = "i2s";
> +			cpu {
> +				sound-dai = <&micfil>;
> +			};
> +		};
> +	};

Note the micfil works well with the simple-audio-card driver which might
be an alternative here.

Sascha

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