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Message-Id: <20250801-fp5-usb-audio-offload-v1-2-240fc213d3d3@fairphone.com>
Date: Fri, 01 Aug 2025 15:51:06 +0200
From: Luca Weiss <luca.weiss@...rphone.com>
To: cros-qcom-dts-watchers@...omium.org,
Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...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-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, Luca Weiss <luca.weiss@...rphone.com>
Subject: [PATCH 2/2] arm64: dts: qcom: qcm6490-fairphone-fp5: 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.
Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
---
arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
index e115b6a52b299ef663ccfb614785f8f89091f39d..d30912f952db271aa4fbc2570ca04b771ffef3ca 100644
--- a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
+++ b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
@@ -1176,6 +1176,22 @@ platform {
sound-dai = <&q6routing>;
};
};
+
+ usb-dai-link {
+ link-name = "USB Playback";
+
+ codec {
+ sound-dai = <&q6usbdai USB_RX>;
+ };
+
+ cpu {
+ sound-dai = <&q6afedai USB_RX>;
+ };
+
+ platform {
+ sound-dai = <&q6routing>;
+ };
+ };
};
&spi13 {
--
2.50.1
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