linux-kernel - Re: [PATCH v2 2/4] arm64: dts: apple: t8103: Add MCA and its support

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Date:   Fri, 19 Aug 2022 16:12:53 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Martin Povišer <povik+lin@...ebit.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Alyssa Rosenzweig <alyssa@...enzweig.io>, asahi@...ts.linux.dev,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] arm64: dts: apple: t8103: Add MCA and its support

On 19/08/2022 15:54, Martin Povišer wrote:
> Add the MCA I2S transceiver node and its supporting NCO, ADMAC nodes.
> 
> Signed-off-by: Martin Povišer <povik+lin@...ebit.org>
> ---
>  arch/arm64/boot/dts/apple/t8103.dtsi | 70 ++++++++++++++++++++++++++++
>  1 file changed, 70 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/apple/t8103.dtsi b/arch/arm64/boot/dts/apple/t8103.dtsi
> index 51a63b29d404..2dc3125aca5b 100644
> --- a/arch/arm64/boot/dts/apple/t8103.dtsi
> +++ b/arch/arm64/boot/dts/apple/t8103.dtsi
> @@ -532,6 +532,76 @@ port02: pci@2,0 {
>  						<0 0 0 4 &port02 0 0 0 3>;
>  			};
>  		};
> +
> +		dart_sio: iommu@...004000 {
> +			compatible = "apple,t8103-dart", "apple,dart";
> +			reg = <0x2 0x35004000 0x0 0x4000>;
> +			interrupt-parent = <&aic>;
> +			interrupts = <AIC_IRQ 635 IRQ_TYPE_LEVEL_HIGH>;
> +			#iommu-cells = <1>;
> +			power-domains = <&ps_sio_cpu>;
> +		};
> +
> +		nco_clkref: clock-ref {
> +			compatible = "fixed-clock";
> +			#clock-cells = <0>;
> +			clock-frequency = <900000000>;
> +			clock-output-names = "nco_ref";
> +		};

Reference clocks are usually physically outside of SoC (e.g. on the
board), so:
1. Not part of "soc" node.
2. It should be defined by board. At least clock-frequency should be there.

> +
> +		nco: nco@...044000 {
> +			compatible = "apple,t8103-nco", "apple,nco";
> +			reg = <0x2 0x3b044000 0x0 0x14000>;
> +			clocks = <&nco_clkref>;
> +			#clock-cells = <1>;
> +		};
> +
> +		admac: dma-controller@...200000 {
> +			compatible = "apple,t8103-admac", "apple,admac";
> +			reg = <0x2 0x38200000 0x0 0x34000>;
> +			dma-channels = <24>;
> +			interrupts-extended = <0>,
> +					      <&aic AIC_IRQ 626 IRQ_TYPE_LEVEL_HIGH>,
> +					      <0>,
> +					      <0>;
> +			#dma-cells = <1>;
> +			iommus = <&dart_sio 2>;
> +			power-domains = <&ps_sio_adma>;
> +		};
> +
> +		mca: mca@...00000 {

Here node name is as well wrong.

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation



Best regards,
Krzysztof