linux-kernel - Re: [PATCH 1/3] dt-bindings: cpufreq: qcom-cpufreq-nvmem: make cpr bindings optional

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Message-ID: <43ff6113-03ee-a40a-b454-53cadec8728a@linaro.org>
Date:   Sun, 22 Jan 2023 14:57:07 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Christian Marangi <ansuelsmth@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Ilia Lin <ilia.lin@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>,
        Yassine Oudjana <y.oudjana@...tonmail.com>,
        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: cpufreq: qcom-cpufreq-nvmem: make cpr
 bindings optional

On 21/01/2023 01:01, Christian Marangi wrote:
> The qcom-cpufreq-nvmem driver also supports legacy devices pre-cpr that
> doesn't have power-domains. When the schema was introduced, it was
> wrongly set to always require these binding but this is not the case for
> legacy device that base everything on nvmem cells and multiple microvolt

What is a "legacy device"? Why do you adjust bindings to legacy device?
Can't you just fix the DTS on these devices?

> binding providing values based on speedbin, psv and version.
> 
> Make the power-domain optional and set them required only for qcs404
> based devices.
> 
> Fixes: ec24d1d55469 ("dt-bindings: opp: Convert qcom-nvmem-cpufreq to DT schema")
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> ---
>  .../bindings/cpufreq/qcom-cpufreq-nvmem.yaml  | 78 +++++++++++++------
>  1 file changed, 54 insertions(+), 24 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/cpufreq/qcom-cpufreq-nvmem.yaml b/Documentation/devicetree/bindings/cpufreq/qcom-cpufreq-nvmem.yaml
> index 9c086eac6ca7..04aac634d7fc 100644
> --- a/Documentation/devicetree/bindings/cpufreq/qcom-cpufreq-nvmem.yaml
> +++ b/Documentation/devicetree/bindings/cpufreq/qcom-cpufreq-nvmem.yaml
> @@ -17,6 +17,9 @@ description: |
>    on the CPU OPP in use. The CPUFreq driver sets the CPR power domain level
>    according to the required OPPs defined in the CPU OPP tables.
>  
> +  For old implementation efuses are parsed to select the correct opp table and
> +  voltage and CPR is not supported/used.
> +
>  select:
>    properties:
>      compatible:
> @@ -33,37 +36,64 @@ select:
>    required:
>      - compatible
>  
> -properties:
> -  cpus:
> -    type: object
> +if:

Missing allOf. Fix also the placement - this block goes before
additionalPropertes:false.

> +  properties:
> +    compatible:
> +      contains:
> +        enum:
> +          - qcom,qcs404
>  
> -    patternProperties:
> -      '^cpu@[0-9a-f]+$':
> -        type: object
> +then:
> +  properties:
> +    cpus:
> +      type: object
>  
> -        properties:
> -          power-domains:

Best regards,
Krzysztof