linux-kernel - Re: [PATCH 1/2] arm64: dts: imx8mp-evk: Add HDMI audio sound card support

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Message-ID: <1786327.VLH7GnMWUR@steina-w>
Date: Fri, 23 Feb 2024 10:06:33 +0100
From: Alexander Stein <alexander.stein@...tq-group.com>
To: robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com, linux-imx@....com, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, shengjiu.wang@...il.com
Cc: Shengjiu Wang <shengjiu.wang@....com>
Subject: Re: [PATCH 1/2] arm64: dts: imx8mp-evk: Add HDMI audio sound card support

Hi,

thanks for the patch.

Am Freitag, 23. Februar 2024, 09:02:18 CET schrieb Shengjiu Wang:
> The AUD2HTX is a digital module that provides a bridge between
> the Audio Subsystem and the HDMI RTX Subsystem. This
> module includes intermediate storage to queue SDMA transactions
> prior to being synchronized and passed to the HDMI
> RTX Subsystem over the Audio Link.
> 
> AUD2HTX works as the cpu dai in HDMI audio sound card.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> ---
>  arch/arm64/boot/dts/freescale/imx8mp-evk.dts | 12 ++++++++++++
>  arch/arm64/boot/dts/freescale/imx8mp.dtsi    | 10 ++++++++++
>  2 files changed, 22 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
> index f87fa5a948cc..63f6e72fa18a 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
> @@ -138,6 +138,14 @@ simple-audio-card,codec {
>  
>  	};
>  
> +	sound-hdmi {
> +		compatible = "fsl,imx-audio-hdmi";
> +		model = "audio-hdmi";
> +		audio-cpu = <&aud2htx>;
> +		hdmi-out;
> +		status = "okay";

No need for 'status' here.

Don't you need to configure the PAI as well? See [1]
for downstream implementation. I'm wondering because I had to hack something
similar. Without I got no HDMI audio.

Best regards,
Alexander

[1] https://github.com/Freescale/linux-fslc/blob/6.1-2.0.x-imx/drivers/gpu/drm/imx/imx8mp-hdmi-pavi.c#L51-L59

> +	};
> +
>  	reserved-memory {
>  		#address-cells = <2>;
>  		#size-cells = <2>;
> @@ -191,6 +199,10 @@ &A53_3 {
>  	cpu-supply = <&reg_arm>;
>  };
>  
> +&aud2htx {
> +	status = "okay";
> +};
> +
>  &eqos {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_eqos>;
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> index 9ab9c057f41e..721ab630d895 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> @@ -1513,6 +1513,16 @@ micfil: audio-controller@...a0000 {
>  					status = "disabled";
>  				};
>  
> +				aud2htx: aud2htx@...b0000 {
> +					compatible = "fsl,imx8mp-aud2htx";
> +					reg = <0x30cb0000 0x10000>;
> +					interrupts = <GIC_SPI 130 IRQ_TYPE_LEVEL_HIGH>;
> +					clocks = <&audio_blk_ctrl IMX8MP_CLK_AUDIOMIX_AUD2HTX_IPG>;
> +					clock-names = "bus";
> +					dmas = <&sdma2 26 2 0>;
> +					dma-names = "tx";
> +					status = "disabled";
> +				};
>  			};
>  
>  			sdma3: dma-controller@...00000 {
> 


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