linux-kernel - Re: [PATCH V3 2/3] arm64: dts: imx8mp: Add micfil node

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Date:   Tue, 3 Oct 2023 22:12:20 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Adam Ford <aford173@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org, marex@...x.de,
        aford@...conembedded.com, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        Abel Vesa <abelvesa@...nel.org>, Peng Fan <peng.fan@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH V3 2/3] arm64: dts: imx8mp: Add micfil node

Hi Adam and devicetree folks,

On Thu, Aug 31, 2023 at 1:44 AM Adam Ford <aford173@...il.com> wrote:
>
> The i.MX8MP has a micfil controller which is used for interfacing
> with a pulse density microphone. Add the node and mark it as
> disabled by default.
>
> Signed-off-by: Adam Ford <aford173@...il.com>
> ---
> V3:  The AUDIOMIX_PDM_ROOT doesn't exist and the real clock is
>      called IMX8MP_CLK_AUDIOMIX_PDM_SEL, so swap it out.
>
> V2:  No change
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> index 3167706d81e1..341fd0369ce9 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> @@ -1479,6 +1479,27 @@ easrc: easrc@...90000 {
>                                         fsl,asrc-format = <2>;
>                                         status = "disabled";
>                                 };
> +
> +                               micfil: audio-controller@...a0000 {
> +                                       compatible = "fsl,imx8mp-micfil";
> +                                       reg = <0x30ca0000 0x10000>;
> +                                       #sound-dai-cells = <0>;

After this patch, the following schema warning is seen:

imx8mp-beacon-kit.dtb: audio-controller@...a0000: '#sound-dai-cells'
does not match any of the regexes: 'pinctrl-[0-9]+'
from schema $id: http://devicetree.org/schemas/sound/fsl,micfil.yaml#

What is the correct way to solve this?

- Document #sound-dai-cells in fsl,micfil.yaml as an optional property
- Remove #sound-dai-cells from imx8mp.dtsi
- Document #sound-dai-cells in fsl,micfil.yaml as a required property
and pass #sound-dai-cells to imx8mm/imx8mn/imx83.dtsi?