linux-kernel - Re: [PATCH v6 23/33] ASoC: dt-bindings: Add Q6USB backend

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Date:   Fri, 15 Sep 2023 17:46:07 -0700
From:   Wesley Cheng <quic_wcheng@...cinc.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        <mathias.nyman@...el.com>, <gregkh@...uxfoundation.org>,
        <lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>, <agross@...nel.org>, <andersson@...nel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>, <srinivas.kandagatla@...aro.org>,
        <bgoswami@...cinc.com>, <Thinh.Nguyen@...opsys.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v6 23/33] ASoC: dt-bindings: Add Q6USB backend

Hi Konrad,

On 9/15/2023 5:37 PM, Konrad Dybcio wrote:
> On 16.09.2023 02:10, 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>
>> ---
>>   .../devicetree/bindings/sound/qcom,q6usb.yaml | 55 +++++++++++++++++++
>>   1 file changed, 55 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/sound/qcom,q6usb.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/sound/qcom,q6usb.yaml b/Documentation/devicetree/bindings/sound/qcom,q6usb.yaml
>> new file mode 100644
>> index 000000000000..51ff0b1ffa2d
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/sound/qcom,q6usb.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 DPCM USB backend DAI
>> +
>> +maintainers:
>> +  - Wesley Cheng <quic_wcheng@...cinc.com>
>> +
>> +description:
>> +  The USB port is a supported AFE path on the Q6 DSP.  This ASoC DPCM
>> +  backend DAI will communicate the required settings to initialize the
>> +  XHCI host controller properly for enabling the offloaded audio stream.
>> +  Parameters defined under this node will carry settings, which will be
>> +  passed along during the QMI stream enable request and configuration of
>> +  the XHCI host controller.
>> +
>> +allOf:
>> +  - $ref: dai-common.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - qcom,q6usb
>> +
>> +  iommus:
>> +    maxItems: 1
>> +
>> +  "#sound-dai-cells":
>> +    const: 1
>> +
>> +  qcom,usb-audio-intr-num:
>> +    description:
>> +      Desired XHCI interrupter number to use.  Depending on the audio DSP
>> +      on the platform, it will operate on a specific XHCI interrupter.
> So is this the number of interrupters to be used or the index of
> a single interrupter? If the latter, then "num" is definitely way
> too ambiguous.
> 

It defines the index of a single interrupter.  I'll change the naming of 
this property.

Thanks
Wesley Cheng