linux-kernel - Re: [PATCH v3 20/28] ASoC: dt-bindings: Add Q6USB backend bindings

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Date:   Thu, 22 Jun 2023 17:15:20 -0700
From:   Wesley Cheng <quic_wcheng@...cinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <srinivas.kandagatla@...aro.org>, <mathias.nyman@...el.com>,
        <perex@...ex.cz>, <broonie@...nel.org>, <lgirdwood@...il.com>,
        <krzysztof.kozlowski+dt@...aro.org>, <agross@...nel.org>,
        <Thinh.Nguyen@...opsys.com>, <bgoswami@...cinc.com>,
        <andersson@...nel.org>, <robh+dt@...nel.org>,
        <gregkh@...uxfoundation.org>, <tiwai@...e.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <quic_jackp@...cinc.com>,
        <quic_plai@...cinc.com>
Subject: Re: [PATCH v3 20/28] ASoC: dt-bindings: Add Q6USB backend bindings

Hi Krzysztof,

On 3/10/2023 12:54 AM, Krzysztof Kozlowski wrote:
> On 09/03/2023 00:57, 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@...cinc.com>
>> ---
>>   .../bindings/sound/qcom,q6usb-dais.yaml       | 49 +++++++++++++++++++
>>   1 file changed, 49 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..8477abc511dd
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/sound/qcom,q6usb-dais.yaml
>> @@ -0,0 +1,49 @@
>> +# 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@...cinc.com>
>> +
>> +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
> 
> What does the "driver" mean? Linux driver? Then drop and focus on
> hardware/Q6DSP.
> 

Sorry for the late reply, was side tracked on some other priorities, and 
reviving this series again.

The driver here is a Linux ASoC based DPCM backend driver, which will 
interface with the CPU dai (q6afe).

>> +  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
> 
> Can q6usb mean anything else? Why "-dais" suffix?
> 

As of now, no...will remove the dai suffix.

>> +
>> +  iommus:
>> +    maxItems: 1
>> +
>> +  "#sound-dai-cells":
>> +    const: 1
>> +
>> +  qcom,usb-audio-intr-num:
>> +    description:
>> +      Desired XHCI interrupter number to use.
>> +    $ref: /schemas/types.yaml#/definitions/uint32
> 
> Why this should be configurable per board or SoC? It's the first use in
> DT and in the same time sounds generic...
> 

Would depend on which interrupter we want to use.  This should be 
configurable per platform in case the audio DSP decides to work off a 
specific interrupter.

Thanks
Wesley Cheng

>> +
>> +required:
>> +  - compatible
>> +  - "#sound-dai-cells"
>> +  - qcom,usb-audio-intr-num
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    dais {
>> +      compatible = "qcom,q6usb-dais";
>> +      #sound-dai-cells = <1>;
>> +      iommus = <&apps_smmu 0x180f 0x0>;
>> +      qcom,usb-audio-intr-num = <2>;
>> +    };
> 
> Best regards,
> Krzysztof
>