Re: [PATCH v5 2/3] arm64: dts: rockchip: Add HDMI0 audio output for rk3588 SoC

[Detlev Casanova]

On Tuesday, 4 February 2025 05:14:37 EST Quentin Schulz wrote:
> Hi Detlev,
> 
> On 2/3/25 6:16 PM, Detlev Casanova wrote:
> > Use the simple-audio-card driver with the hdmi0 QP node as CODEC and
> > the i2s5 device as CPU.
> > 
> > The simple-audio-card,mclk-fs value is set to 128 as it is done in
> > the downstream driver.
> > 
> > The #sound-dai-cells value is set to 0 in the hdmi0 node so that it can be
> > used as an audio codec node.
> > 
> > Signed-off-by: Detlev Casanova <detlev.casanova@xxxxxxxxxxxxx>
> > ---
> > 
> >   arch/arm64/boot/dts/rockchip/rk3588-base.dtsi | 17 +++++++++++++++++
> >   1 file changed, 17 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi
> > b/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi index
> > 8cfa30837ce72..767bdfc06b7ec 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi
> > +++ b/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi
> > @@ -1369,6 +1369,22 @@ i2s9_8ch: i2s@fddfc000 {
> > 
> >   		status = "disabled";
> >   	
> >   	};
> > 
> > +	hdmi0_sound: hdmi0-sound {
> > +		compatible = "simple-audio-card";
> > +		simple-audio-card,format = "i2s";
> > +		simple-audio-card,mclk-fs = <128>;
> > +		simple-audio-card,name = "hdmi0";
> > +		status = "disabled";
> > +
> > +		simple-audio-card,codec {
> > +			sound-dai = <&hdmi0>;
> > +		};
> > +
> > +		simple-audio-card,cpu {
> > +			sound-dai = <&i2s5_8ch>;
> > +		};
> > +	};
> > +
> 
> This is an address/bus-less device, so I believe it needs to be put
> among other address/bus-less devices, which for Rockchip SoCs is at the
> top of the DT? c.f.
> https://www.kernel.org/doc/html/latest/devicetree/bindings/dts-coding-style.
> html
> 
> **I** would put it between the firmware and the pmu-a55 nodes.

I wasn't sure about this. It makes sense to move it with address-less devices, 
but the rk3399 device tree has it above the hdmi node, so I wanted to stay 
consistent with that.

> Tested-by: Quentin Schulz <quentin.schulz@xxxxxxxxx> # RK3588 Tiger Haikou
> 
> Thanks!
> Quentin