linux-kernel - Re: [PATCH v2 2/6] dt-bindings: interconnect: Add property to set BCM TCS wait behavior

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Message-ID: <20200710163119.GA2753833@bogus>
Date:   Fri, 10 Jul 2020 10:31:19 -0600
From:   Rob Herring <robh@...nel.org>
To:     Mike Tipton <mdtipton@...eaurora.org>
Cc:     georgi.djakov@...aro.org, bjorn.andersson@...aro.org,
        agross@...nel.org, linux-pm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/6] dt-bindings: interconnect: Add property to set
 BCM TCS wait behavior

On Thu, Jul 09, 2020 at 06:56:48PM -0700, Mike Tipton wrote:
> Add "qcom,tcs-wait" property to set which TCS should wait for completion
> when triggering.
> 
> Signed-off-by: Mike Tipton <mdtipton@...eaurora.org>
> ---
>  .../bindings/interconnect/qcom,bcm-voter.yaml       | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/interconnect/qcom,bcm-voter.yaml b/Documentation/devicetree/bindings/interconnect/qcom,bcm-voter.yaml
> index 5971fc1df08d..f0c3d6b01831 100644
> --- a/Documentation/devicetree/bindings/interconnect/qcom,bcm-voter.yaml
> +++ b/Documentation/devicetree/bindings/interconnect/qcom,bcm-voter.yaml
> @@ -21,6 +21,16 @@ properties:
>      enum:
>        - qcom,bcm-voter
>  
> +  qcom,tcs-wait:
> +    description: |
> +      Optional mask of which TCSs (Triggered Command Sets) wait for completion
> +      upon triggering. In most cases, it's necessary to wait in both the AMC
> +      and WAKE sets to ensure resources are available before use. If a specific
> +      RSC and its use cases can ensure sufficient delay by other means, then
> +      this can be overridden to reduce latencies.

I have no idea what any of this means to provide any meaningful comment.

> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    default: QCOM_ICC_TAG_ACTIVE_ONLY

Can't use defines here.

> +
>  required:
>    - compatible
>  
> @@ -39,7 +49,10 @@ examples:
>    # as defined in Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt
>    - |
>  
> +    #include <dt-bindings/interconnect/qcom,icc.h>
> +
>      disp_bcm_voter: bcm_voter {
>          compatible = "qcom,bcm-voter";
> +        qcom,tcs-wait = <QCOM_ICC_TAG_AMC>;
>      };
>  ...
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>