linux-kernel - Re: [PATCH v2 3/6] dt-bindings: interconnect: Update Qualcomm SDM845 DT bindings

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Message-ID: <20200115144942.GA15075@bogus>
Date:   Wed, 15 Jan 2020 08:49:42 -0600
From:   Rob Herring <robh@...nel.org>
To:     David Dai <daidavid1@...eaurora.org>
Cc:     georgi.djakov@...aro.org, bjorn.andersson@...aro.org,
        evgreen@...gle.com, sboyd@...nel.org, ilina@...eaurora.org,
        seansw@....qualcomm.com, elder@...aro.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 3/6] dt-bindings: interconnect: Update Qualcomm SDM845
 DT bindings

On Thu, Jan 09, 2020 at 08:33:01PM -0800, David Dai wrote:
> Redefine the Network-on-Chip devices to more accurately describe
> the interconnect topology on Qualcomm's SDM845 platform. Each
> interconnect device can communicate with different instances of the
> RPMh hardware which are described as RSCs(Resource State Coordinators).
> 
> Signed-off-by: David Dai <daidavid1@...eaurora.org>
> ---
>  .../bindings/interconnect/qcom,sdm845.yaml         | 49 ++++++++++++++++++----
>  1 file changed, 40 insertions(+), 9 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/interconnect/qcom,sdm845.yaml b/Documentation/devicetree/bindings/interconnect/qcom,sdm845.yaml
> index 61e0097..6741a12 100644
> --- a/Documentation/devicetree/bindings/interconnect/qcom,sdm845.yaml
> +++ b/Documentation/devicetree/bindings/interconnect/qcom,sdm845.yaml
> @@ -13,21 +13,44 @@ description: |
>     SDM845 interconnect providers support system bandwidth requirements through
>     RPMh hardware accelerators known as Bus Clock Manager (BCM). The provider is
>     able to communicate with the BCM through the Resource State Coordinator (RSC)
> -   associated with each execution environment. Provider nodes must reside within
> -   an RPMh device node pertaining to their RSC and each provider maps to a
> -   single RPMh resource.
> +   associated with each execution environment. Provider nodes must point to at
> +   least one RPMh device child node pertaining to their RSC and each provider
> +   can map to multiple RPMh resources.
>   
>  properties:
> +  reg:
> +    maxItems: 1
> +
>    compatible:
>      enum:
> -      - qcom,sdm845-rsc-hlos
> +      - qcom,sdm845-aggre1-noc
> +      - qcom,sdm845-aggre2-noc
> +      - qcom,sdm845-config-noc
> +      - qcom,sdm845-dc-noc
> +      - qcom,sdm845-gladiator-noc
> +      - qcom,sdm845-mem-noc
> +      - qcom,sdm845-mmss-noc
> +      - qcom,sdm845-system-noc
>  
>    '#interconnect-cells':
>      const: 1
>  
> +  qcom,bcm-voter-names:
> +    items:
> +      - const: apps
> +      - const: disp

If these are always the names, why do you need them?

> +
> +  qcom,bcm-voters:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    description: |
> +      List of phandles to qcom,bcm-voter nodes that are required by
> +      this interconnect to send RPMh commands.

Is the max length 2?

> +
>  required:
>    - compatible
> +  - reg
>    - '#interconnect-cells'
> +  - qcom,bcm-voters
>  
>  additionalProperties: false
>  
> @@ -35,9 +58,17 @@ examples:
>    - |
>        #include <dt-bindings/interconnect/qcom,sdm845.h>
>  
> -      apps_rsc: rsc {
> -              rsc_hlos: interconnect {
> -                      compatible = "qcom,sdm845-rsc-hlos";
> -                      #interconnect-cells = <1>;
> -              };
> +      mem_noc: interconnect@...0000 {
> +             compatible = "qcom,sdm845-mem-noc";
> +             reg = <0 0x01380000 0 0x27200>;
> +             #interconnect-cells = <1>;
> +             qcom,bcm-voters = <&apps_bcm_voter>;
> +      };
> +
> +      mmss_noc: interconnect@...0000 {
> +             compatible = "qcom,sdm845-mmss-noc";
> +             reg = <0 0x01740000 0 0x1c1000>;
> +             #interconnect-cells = <1>;
> +             qcom,bcm-voter-names = "apps", "disp";
> +             qcom,bcm-voters = <&apps_bcm_voter>, <&disp_bcm_voter>;
>        };
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>