linux-kernel - Re: [PATCH RFC 2/6] ASoC: dt-bindings: qcom,sm8250: Add clocks properties for I2S

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Message-ID: <ac2188dc-d524-41ae-b9d2-f0f5ff9861f0@linaro.org>
Date: Wed, 8 Oct 2025 19:53:16 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 Srinivas Kandagatla <srini@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
 Takashi Iwai <tiwai@...e.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-sound@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH RFC 2/6] ASoC: dt-bindings: qcom,sm8250: Add clocks
 properties for I2S

On 10/7/25 12:21, Konrad Dybcio wrote:
> On 10/6/25 8:37 PM, Neil Armstrong wrote:
>> In order to describe the block and master clock of each I2S bus, add
>> the first 5 I2S busses clock entries.
>>
>> The names (primary, secondary, tertiarty, quaternary, quinary) uses
>> the LPASS clock naming which were used for a long time on Qualcomm
>> LPASS firmware interfaces.
>>
>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
>> ---
> 
> There's also a senary (6th) I2S bus instance, which there is no reason
> not to describe

Will add

Neil

> 
>>   .../devicetree/bindings/sound/qcom,sm8250.yaml         | 18 ++++++++++++++++++
>>   1 file changed, 18 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/sound/qcom,sm8250.yaml b/Documentation/devicetree/bindings/sound/qcom,sm8250.yaml
>> index 8ac91625dce5ccba5c5f31748c36296b12fac1a6..fd0d7a7ddc7b363a66e1e7bd72c7290666efb511 100644
>> --- a/Documentation/devicetree/bindings/sound/qcom,sm8250.yaml
>> +++ b/Documentation/devicetree/bindings/sound/qcom,sm8250.yaml
>> @@ -64,6 +64,24 @@ properties:
>>       $ref: /schemas/types.yaml#/definitions/string
>>       description: User visible long sound card name
>>   
>> +  clocks:
>> +    minItems: 2
>> +    maxItems: 10
>> +
>> +  clock-names:
>> +    minItems: 2
>> +    items:
>> +      - const: primary-mi2s    # Primary I2S Bit Clock
>> +      - const: primary-mclk    # Primary I2S Master Clock
>> +      - const: secondary-mi2s  # Secondary I2S Bit Clock
>> +      - const: secondary-mclk  # Secondary I2S Master Clock
>> +      - const: tertiary-mi2s   # Tertiary I2S Bit Clock
>> +      - const: tertiary-mclk   # Tertiary I2S Master Clock
>> +      - const: quaternary-mi2s # Quaternary I2S Bit Clock
>> +      - const: quaternary-mclk # Quaternary I2S Master Clock
>> +      - const: quinary-mi2s    # Quinary I2S Bit Clock
>> +      - const: quinary-mclk    # Quinary I2S Master Clock
> 
> I think a single top-level comment saying "mclk" is the master
> clock and the other one is a bit clock would suffice
> 
> Konrad