Re: [RFC PATCH v2 21/22] ASoC: dt-bindings: Add Q6USB backend bindings

[Srinivas Kandagatla]

On 26/01/2023 03:14, Wesley Cheng wrote:
> Add a dt-binding to describe the definition of enabling the Q6 USB backend
> device for audio offloading.  The node carries information, which is passed
> along to the QC USB SND class driver counterpart.  These parameters will be
> utilized during QMI stream enable requests.
>
> Signed-off-by: Wesley Cheng <quic_wcheng@xxxxxxxxxxx>
> ---
>   .../bindings/sound/qcom,q6usb-dais.yaml       | 55 +++++++++++++++++++
>   1 file changed, 55 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/sound/qcom,q6usb-dais.yaml
>
> diff --git a/Documentation/devicetree/bindings/sound/qcom,q6usb-dais.yaml b/Documentation/devicetree/bindings/sound/qcom,q6usb-dais.yaml
> new file mode 100644
> index 000000000000..e24b4d52fa7e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/qcom,q6usb-dais.yaml
> @@ -0,0 +1,55 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/qcom,q6usb-dais.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm ASoC USB backend DAI
> +
> +maintainers:
> +  - Wesley Cheng <quic_wcheng@xxxxxxxxxxx>
> +
> +description:
> +  The Q6USB backend is a supported AFE port on the Q6DSP. This backend
> +  driver will communicate the required settings to the QC USB SND class
> +  driver for properly enabling the audio stream.  Parameters defined
> +  under this node will carry settings, which will be passed along during
> +  the QMI stream enable request.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,q6usb-dais
> +
> +  iommus:
> +    maxItems: 1
> +
> +  "#sound-dai-cells":
> +    const: 1
> +
> +  qcom,usb-audio-stream-id:
> +    description:
> +      SID for the Q6DSP processor for IOMMU mapping.
> +    $ref: /schemas/types.yaml#/definitions/uint32

We could derive this directly from iommus property as we do it like 
q6asm-dai.c


--srini
> +
> +  qcom,usb-audio-intr-num:
> +    description:
> +      Desired XHCI interrupter number to use.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +required:
> +  - compatible
> +  - '#sound-dai-cells'
> +  - qcom,usb-audio-intr-num
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    usbdai: usbd {
> +      compatible = "qcom,q6usb-dais";
> +      #sound-dai-cells = <1>;
> +      iommus = <&apps_smmu 0x180f 0x0>;
> +      qcom,usb-audio-stream-id = <0xf>;
> +      qcom,usb-audio-intr-num = <2>;
> +    };