Add the required nodes for sound playback via a connected external
display (DisplayPort over USB-C).

In user space just the following route needs to be set (e.g. using
ALSA UCM):

  amixer -c0 cset name='DISPLAY_PORT_RX Audio Mixer MultiMedia1' 1

Afterwards one can play audio on the MultiMedia1 sound device, e.g.:

  aplay -D plughw:0,0 test.wav

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
---
 arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts | 31 ++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
index 9e8f9fb57c4723a24704a8239a86c6081910916b..e115b6a52b299ef663ccfb614785f8f89091f39d 100644
--- a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
+++ b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
@@ -14,6 +14,8 @@
 #include <dt-bindings/leds/common.h>
 #include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
 #include <dt-bindings/regulator/qcom,rpmh-regulator.h>
+#include <dt-bindings/sound/qcom,q6asm.h>
+#include <dt-bindings/sound/qcom,q6dsp-lpass-ports.h>
 #include "sc7280.dtsi"
 #include "pm7250b.dtsi"
 #include "pm7325.dtsi"
@@ -1147,6 +1149,35 @@ &sdhc_2 {
 	status = "okay";
 };
 
+&sound {
+	compatible = "fairphone,fp5-sndcard";
+	model = "Fairphone 5";
+
+	mm1-dai-link {
+		link-name = "MultiMedia1";
+
+		cpu {
+			sound-dai = <&q6asmdai MSM_FRONTEND_DAI_MULTIMEDIA1>;
+		};
+	};
+
+	displayport-rx-dai-link {
+		link-name = "DisplayPort Playback";
+
+		codec {
+			sound-dai = <&mdss_dp>;
+		};
+
+		cpu {
+			sound-dai = <&q6afedai DISPLAY_PORT_RX>;
+		};
+
+		platform {
+			sound-dai = <&q6routing>;
+		};
+	};
+};
+
 &spi13 {
 	status = "okay";
 

-- 
2.49.0

On Fri, Apr 18, 2025 at 03:13:46PM +0200, Luca Weiss wrote:
> Add the required nodes for sound playback via a connected external
> display (DisplayPort over USB-C).
> 
> In user space just the following route needs to be set (e.g. using
> ALSA UCM):
> 
>   amixer -c0 cset name='DISPLAY_PORT_RX Audio Mixer MultiMedia1' 1
> 
> Afterwards one can play audio on the MultiMedia1 sound device, e.g.:
> 
>   aplay -D plughw:0,0 test.wav
> 
> Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
> ---
>  arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts | 31 ++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

-- 
With best wishes
Dmitry