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

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Date: Mon, 26 Feb 2024 11:06:48 +0800
From: Shengjiu Wang <shengjiu.wang@...il.com>
To: Alexander Stein <alexander.stein@...tq-group.com>
Cc: 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 <shengjiu.wang@....com>
Subject: Re: [PATCH 1/2] arm64: dts: imx8mp-evk: Add HDMI audio sound card support

On Fri, Feb 23, 2024 at 5:06 PM Alexander Stein
<alexander.stein@...tq-group.com> wrote:
>
> 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.

ok, will remove it.

>
> 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.

Yes, the PAI part is needed.
But this commit is just for sound card dts update.

Best regards
Wang shengjiu

>
> 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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