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Commit b373c65e authored by Hemant Kumar's avatar Hemant Kumar
Browse files

sound: dt-bindings: Add USB audio QMI driver bindings 



Add bindings for usb audio qmi service device. A remote entity
communicates with usb audio qmi server to enable or disable
particular audio stream on enumerated usb audio device.
This offloads ISOC data transfer operations to remote entity and
allows apps processor to go to power collapse more frequently for
better power saving.

Change-Id: I391dd45925799d364ab637a3050be61b7da6dbb1
Signed-off-by: default avatarHemant Kumar <hemantk@codeaurora.org>
parent f1fb1191

Documentation/devicetree/bindings/sound/qcom-usb-audio-qmi-dev.txt

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+26 −0
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QTI USB Audio QMI Device



USB Audio QMI device is used to attach to remote processor IOMMU and

map USB Audio driver specific memory to iova to share with remote

processor.



Required Properties:



- compatible : "qcom,usb-audio-qmi-dev"



- iommus : A list of phandle and IOMMU specifier pairs that describe the

  IOMMU master interfaces of the device.



- qcom,usb-audio-stream-id : Stream id is prepended to iova before passing

  iova to remote processor. This allows remote processor to access iova.



- qcom,usb-audio-intr-num : Interrupter number for external sub system

  destination.



Example:

	usb_audio_qmi_dev {

		compatible = "qcom,usb-audio-qmi-dev";

		iommus = <&lpass_q6_smmu 12>;

		qcom,usb-audio-stream-id = <12>;

		qcom,usb-audio-intr-num = <1>;

	};