linux-kernel - [PATCH v2 5/5] arm64: dts: qcom: sm7225-fairphone-fp4: Enable USB audio offload support

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Message-Id: <20250501-fp4-usb-audio-offload-v2-5-30f4596281cd@fairphone.com>
Date: Thu, 01 May 2025 08:48:51 +0200
From: Luca Weiss <luca.weiss@...rphone.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Felipe Balbi <balbi@...nel.org>, 
 Srinivas Kandagatla <srini@...nel.org>, Liam Girdwood <lgirdwood@...il.com>, 
 Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>, 
 Takashi Iwai <tiwai@...e.com>, Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Wesley Cheng <quic_wcheng@...cinc.com>, 
 Stephan Gerhold <stephan.gerhold@...aro.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org, 
 linux-usb@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 linux-arm-msm@...r.kernel.org, linux-sound@...r.kernel.org, 
 Luca Weiss <luca.weiss@...rphone.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Subject: [PATCH v2 5/5] arm64: dts: qcom: sm7225-fairphone-fp4: Enable USB
 audio offload support

Enable USB audio offloading which allows to play audio via a USB-C
headset with lower power consumption and enabling some other features.

This can be used like the following:

  $ amixer -c0 cset name='USB_RX Audio Mixer MultiMedia1' On
  $ aplay --device=plughw:0,0 test.wav

Compared to regular playback to the USB sound card no xhci-hcd
interrupts appear during playback, instead the ADSP will be handling the
USB transfers.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
---
 arch/arm64/boot/dts/qcom/sm6350.dtsi              |  3 ++
 arch/arm64/boot/dts/qcom/sm7225-fairphone-fp4.dts | 36 +++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sm6350.dtsi b/arch/arm64/boot/dts/qcom/sm6350.dtsi
index 92a2f6e0c3d856eb2549a89509486979a7439cd8..864874472248dbdc5ab6483108bdb286afa77de5 100644
--- a/arch/arm64/boot/dts/qcom/sm6350.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm6350.dtsi
@@ -2956,6 +2956,9 @@ wifi: wifi@...00000 {
 		};
 	};
 
+	sound: sound {
+	};
+
 	thermal-zones {
 		aoss0-thermal {
 			thermal-sensors = <&tsens0 0>;
diff --git a/arch/arm64/boot/dts/qcom/sm7225-fairphone-fp4.dts b/arch/arm64/boot/dts/qcom/sm7225-fairphone-fp4.dts
index 71e87ab929551b339216a5fa583833ed8661a606..60ad7884c635ec28a3706da506c16a78b3214265 100644
--- a/arch/arm64/boot/dts/qcom/sm7225-fairphone-fp4.dts
+++ b/arch/arm64/boot/dts/qcom/sm7225-fairphone-fp4.dts
@@ -19,6 +19,7 @@
 #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/usb/pd.h>
 #include "sm7225.dtsi"
 #include "pm6150l.dtsi"
@@ -955,6 +956,12 @@ channel@644 {
 	};
 };
 
+&q6asmdai {
+	dai@0 {
+		reg = <MSM_FRONTEND_DAI_MULTIMEDIA1>;
+	};
+};
+
 &qup_uart1_cts {
 	/*
 	 * Configure a bias-bus-hold on CTS to lower power
@@ -1023,6 +1030,35 @@ &sdhc_2 {
 	status = "okay";
 };
 
+&sound {
+	compatible = "fairphone,fp4-sndcard";
+	model = "Fairphone 4";
+
+	mm1-dai-link {
+		link-name = "MultiMedia1";
+
+		cpu {
+			sound-dai = <&q6asmdai MSM_FRONTEND_DAI_MULTIMEDIA1>;
+		};
+	};
+
+	usb-dai-link {
+		link-name = "USB Playback";
+
+		codec {
+			sound-dai = <&q6usbdai USB_RX>;
+		};
+
+		cpu {
+			sound-dai = <&q6afedai USB_RX>;
+		};
+
+		platform {
+			sound-dai = <&q6routing>;
+		};
+	};
+};
+
 &tlmm {
 	gpio-reserved-ranges = <13 4>, <56 2>;
 

-- 
2.49.0