linux-kernel - Re: [PATCH 1/3] dt-bindings: interconnect: qcom,msm8998-bwmon: Add global registers

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Message-ID: <0e74ad9a-2333-ea9e-b569-1bf8c965b217@linaro.org>
Date:   Sun, 5 Mar 2023 15:52:02 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Georgi Djakov <djakov@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Thara Gopinath <thara.gopinath@...il.com>
Cc:     linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: interconnect: qcom,msm8998-bwmon: Add
 global registers

On 04/03/2023 16:39, Konrad Dybcio wrote:
> The BWMON has two sets of registers: one for handling the monitor itself
> and one called "global", which we didn't care about before, as on newer
> SoCs it was made contiguous with (but not the same as) the monitor's
> register range. Describe it.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>  .../bindings/interconnect/qcom,msm8998-bwmon.yaml  | 28 ++++++++++++++++++----
>  1 file changed, 24 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/interconnect/qcom,msm8998-bwmon.yaml b/Documentation/devicetree/bindings/interconnect/qcom,msm8998-bwmon.yaml
> index 12a0d3ecbabb..6dd0cb0a1f43 100644
> --- a/Documentation/devicetree/bindings/interconnect/qcom,msm8998-bwmon.yaml
> +++ b/Documentation/devicetree/bindings/interconnect/qcom,msm8998-bwmon.yaml
> @@ -49,9 +49,13 @@ properties:
>      type: object
>  
>    reg:
> -    # BWMON v4 (currently described) and BWMON v5 use one register address
> -    # space.  BWMON v2 uses two register spaces - not yet described.
> -    maxItems: 1
> +    # BWMON v5 uses one register address space, v1-v4 use one or two.
> +    minItems: 1
> +    maxItems: 2
> +
> +  reg-names:
> +    minItems: 1
> +    maxItems: 2
>  
>  required:
>    - compatible
> @@ -63,6 +67,21 @@ required:
>  
>  additionalProperties: false
>  
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          const: qcom,msm8998-bwmon
> +    then:
> +      properties:
> +        reg:
> +          minItems: 2
> +
> +        reg-names:
> +          items:
> +            - const: monitor
> +            - const: global

else:
  reg:
    maxItems: 1

and either disallow reg-names or move it to the top-level.

> +
>  examples:
>    - |
>      #include <dt-bindings/interconnect/qcom,sdm845.h>
> @@ -70,7 +89,8 @@ examples:
>  
>      pmu@...6400 {
>          compatible = "qcom,sdm845-bwmon", "qcom,msm8998-bwmon";
> -        reg = <0x01436400 0x600>;
> +        reg = <0x01436400 0x600>, <0x01436300 0x200>;

That's not correct for sdm845. It's only one address space for sdm845.


Best regards,
Krzysztof