linux-kernel - Re: [PATCH v2 2/7] dt-bindings: soundwire: qcom: add 16-bit sample interval

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Message-ID: <7c7afc80-713f-1949-4feb-f5f2d192569c@linaro.org>
Date:   Wed, 12 Apr 2023 18:16:00 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Rao Mandadapu <quic_srivasam@...cinc.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Cc:     Patrick Lai <quic_plai@...cinc.com>
Subject: Re: [PATCH v2 2/7] dt-bindings: soundwire: qcom: add 16-bit sample
 interval

On 12/04/2023 17:28, Srinivas Kandagatla wrote:
> 
> 
> On 03/04/2023 14:24, Krzysztof Kozlowski wrote:
>> The port sample interval was always 16-bit, split into low and high
>> bytes.  This split was unnecessary, although harmless for older devices
>> because all of them used only lower byte (so values < 0xff).  With
>> support for Soundwire controller on Qualcomm SM8550 and its devices,
>> both bytes will be used, thus add a new 'qcom,ports-sinterval' property
>> to allow 16-bit sample intervals.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>> ---
>>   .../bindings/soundwire/qcom,soundwire.yaml    | 22 +++++++++++++++++--
>>   1 file changed, 20 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/soundwire/qcom,soundwire.yaml b/Documentation/devicetree/bindings/soundwire/qcom,soundwire.yaml
>> index c283c594fb5c..883b8be9be1b 100644
>> --- a/Documentation/devicetree/bindings/soundwire/qcom,soundwire.yaml
>> +++ b/Documentation/devicetree/bindings/soundwire/qcom,soundwire.yaml
>> @@ -86,7 +86,7 @@ properties:
>>     qcom,ports-sinterval-low:
>>       $ref: /schemas/types.yaml#/definitions/uint8-array
>>       description:
>> -      Sample interval low of each data port.
>> +      Sample interval (only lowest byte) of each data port.
>>         Out ports followed by In ports. Used for Sample Interval calculation.
>>         Value of 0xff indicates that this option is not implemented
>>         or applicable for the respective data port.
>> @@ -94,6 +94,19 @@ properties:
>>       minItems: 3
>>       maxItems: 16
>>   
>> +  qcom,ports-sinterval:
>> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> 
> Should this not be ref: /schemas/types.yaml#/definitions/uint16-array ?

Same answer as for Rob:

Because I am afraid it will grow in next version to 24 or 32 bits. I can
change easily maximum, but if I put here uint16-array, all DTS will have
/bytes 16/ annotation.

Best regards,
Krzysztof