linux-kernel - Re: [PATCH v3 2/7] dt-bindings: soundwire: qcom: add 16-bit sample interval

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Message-ID: <4a250d8f-5771-4933-be99-5721c163fe8a@linaro.org>
Date:   Tue, 18 Apr 2023 11:08:47 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...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:     Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v3 2/7] dt-bindings: soundwire: qcom: add 16-bit sample
 interval



On 18/04/2023 10:54, 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.
> 
> Reviewed-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> ---

Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

--srini
> 
> Changes since v2:
> 1. Use uint16 for qcom,ports-sinterval.
>     DTS will be fixed in separate patchset.
> 2. Add tags.
> ---
>   .../bindings/soundwire/qcom,soundwire.yaml    | 20 +++++++++++++++++--
>   1 file changed, 18 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/soundwire/qcom,soundwire.yaml b/Documentation/devicetree/bindings/soundwire/qcom,soundwire.yaml
> index 98c7fc7e1189..fb44b89a754e 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 +94,17 @@ properties:
>       minItems: 3
>       maxItems: 16
>   
> +  qcom,ports-sinterval:
> +    $ref: /schemas/types.yaml#/definitions/uint16-array
> +    description:
> +      Sample interval of each data port.
> +      Out ports followed by In ports. Used for Sample Interval calculation.
> +      Value of 0xffff indicates that this option is not implemented
> +      or applicable for the respective data port.
> +      More info in MIPI Alliance SoundWire 1.0 Specifications.
> +    minItems: 3
> +    maxItems: 16
> +
>     qcom,ports-offset1:
>       $ref: /schemas/types.yaml#/definitions/uint8-array
>       description:
> @@ -220,10 +231,15 @@ required:
>     - '#size-cells'
>     - qcom,dout-ports
>     - qcom,din-ports
> -  - qcom,ports-sinterval-low
>     - qcom,ports-offset1
>     - qcom,ports-offset2
>   
> +oneOf:
> +  - required:
> +      - qcom,ports-sinterval-low
> +  - required:
> +      - qcom,ports-sinterval
> +
>   additionalProperties: false
>   
>   examples: