linux-kernel - Re: [PATCH v2 1/7] dt-bindings: interconnect: qcom: Introduce qcom,rpm-common

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Message-ID: <20230811164814.GA3587580-robh@kernel.org>
Date:   Fri, 11 Aug 2023 10:48:14 -0600
From:   Rob Herring <robh@...nel.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Georgi Djakov <djakov@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawn.guo@...aro.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/7] dt-bindings: interconnect: qcom: Introduce
 qcom,rpm-common

On Mon, Jul 24, 2023 at 04:06:27PM +0200, Konrad Dybcio wrote:
> The current RPM interconnect bindings are messy. Start cleaning them
> up with a common include.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>  .../bindings/interconnect/qcom,qcm2290.yaml        | 18 +++++++-------
>  .../bindings/interconnect/qcom,rpm-common.yaml     | 28 ++++++++++++++++++++++
>  2 files changed, 36 insertions(+), 10 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/interconnect/qcom,qcm2290.yaml b/Documentation/devicetree/bindings/interconnect/qcom,qcm2290.yaml
> index f65a2fe846de..df89f390a9b0 100644
> --- a/Documentation/devicetree/bindings/interconnect/qcom,qcm2290.yaml
> +++ b/Documentation/devicetree/bindings/interconnect/qcom,qcm2290.yaml
> @@ -13,6 +13,9 @@ description: |
>    The Qualcomm QCM2290 interconnect providers support adjusting the
>    bandwidth requirements between the various NoC fabrics.
>  
> +allOf:
> +  - $ref: qcom,rpm-common.yaml#
> +
>  properties:
>    reg:
>      maxItems: 1
> @@ -23,9 +26,6 @@ properties:
>        - qcom,qcm2290-cnoc
>        - qcom,qcm2290-snoc
>  
> -  '#interconnect-cells':
> -    const: 1
> -
>    clock-names:
>      items:
>        - const: bus
> @@ -44,6 +44,9 @@ patternProperties:
>        The interconnect providers do not have a separate QoS register space,
>        but share parent's space.
>  
> +    allOf:
> +      - $ref: qcom,rpm-common.yaml#
> +
>      properties:
>        compatible:
>          enum:
> @@ -51,9 +54,6 @@ patternProperties:
>            - qcom,qcm2290-mmrt-virt
>            - qcom,qcm2290-mmnrt-virt
>  
> -      '#interconnect-cells':
> -        const: 1
> -
>        clock-names:
>          items:
>            - const: bus
> @@ -66,20 +66,18 @@ patternProperties:
>  
>      required:
>        - compatible
> -      - '#interconnect-cells'
>        - clock-names
>        - clocks
>  
> -    additionalProperties: false
> +    unevaluatedProperties: false
>  
>  required:
>    - compatible
>    - reg
> -  - '#interconnect-cells'
>    - clock-names
>    - clocks
>  
> -additionalProperties: false
> +unevaluatedProperties: false
>  
>  examples:
>    - |
> diff --git a/Documentation/devicetree/bindings/interconnect/qcom,rpm-common.yaml b/Documentation/devicetree/bindings/interconnect/qcom,rpm-common.yaml
> new file mode 100644
> index 000000000000..1ea52b091609
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interconnect/qcom,rpm-common.yaml
> @@ -0,0 +1,28 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/interconnect/qcom,rpm-common.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm RPMh Network-On-Chip Interconnect
> +
> +maintainers:
> +  - Konrad Dybcio <konradybcio@...nel.org>
> +
> +description:
> +  RPM interconnect providers support for managing system bandwidth requirements
> +  through manual requests based on either predefined values or as indicated by
> +  the bus monitor hardware. Each provider node represents a NoC bus master,
> +  driven by a dedicated clock source.
> +
> +properties:
> +  '#interconnect-cells':
> +    oneOf:
> +      - const: 2
> +      - const: 1
> +        deprecated: true

I think this is kind of questionable for a single property. Do you 
plan to add more properties here? Also, if you add a new user of this 
schema, then it's going to allow the deprecated case when it could just 
start with 2 only.

Rob