linux-kernel - Re: [TEGRA194_CPUFREQ PATCH v6 1/4] dt-bindings: arm: Add NVIDIA Tegra194 CPU Complex binding

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Message-ID: <a5b83dc3-63b9-9140-a7fe-52841d079141@nvidia.com>
Date:   Wed, 15 Jul 2020 15:52:48 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     Rob Herring <robh@...nel.org>
CC:     <rjw@...ysocki.net>, <viresh.kumar@...aro.org>,
        <catalin.marinas@....com>, <will@...nel.org>,
        <thierry.reding@...il.com>, <mirq-linux@...e.qmqm.pl>,
        <devicetree@...r.kernel.org>, <jonathanh@...dia.com>,
        <talho@...dia.com>, <linux-pm@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <bbasu@...dia.com>,
        <mperttunen@...dia.com>, Sumit Gupta <sumitg@...dia.com>
Subject: Re: [TEGRA194_CPUFREQ PATCH v6 1/4] dt-bindings: arm: Add NVIDIA
 Tegra194 CPU Complex binding

Thank you for the review.

>> Add device-tree binding documentation to represent Tegra194
>> CPU Complex with compatible string under 'cpus' node. This
>> can be used by drivers like cpufreq which don't have their
>> node or CPU Complex node to bind to. Also, documenting
>> 'nvidia,bpmp' property which points to BPMP device.
>>
>> Signed-off-by: Sumit Gupta <sumitg@...dia.com>
>> ---
>>   .../bindings/arm/nvidia,tegra194-ccplex.yaml       | 106 +++++++++++++++++++++
>>   1 file changed, 106 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/arm/nvidia,tegra194-ccplex.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/arm/nvidia,tegra194-ccplex.yaml b/Documentation/devicetree/bindings/arm/nvidia,tegra194-ccplex.yaml
>> new file mode 100644
>> index 0000000..06dbdaa
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/arm/nvidia,tegra194-ccplex.yaml
>> @@ -0,0 +1,106 @@
>> +# SPDX-License-Identifier: GPL-2.0
> 
> Dual license please.
> 
Ok.

>> +%YAML 1.2
>> +---
>> +$id: "http://devicetree.org/schemas/arm/nvidia,tegra194-ccplex.yaml#"
>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>> +
>> +title: NVIDIA Tegra194 CPU Complex device tree bindings
>> +
>> +maintainers:
>> +  - Thierry Reding <thierry.reding@...il.com>
>> +  - Jonathan Hunter <jonathanh@...dia.com>
>> +  - Sumit Gupta <sumitg@...dia.com>
>> +
>> +description: |+
>> +  Tegra194 SOC has homogeneous architecture where each cluster has two
>> +  symmetric cores. Compatible string in "cpus" node represents the CPU
>> +  Complex having all clusters.
>> +
>> +properties:
> 
> $nodename:
>    const: cpus
> 
Ok.

>> +  compatible:
>> +    enum:
>> +      - nvidia,tegra194-ccplex
>> +
>> +  nvidia,bpmp:
>> +    $ref: '/schemas/types.yaml#/definitions/phandle'
>> +    description: |
>> +      Specifies the bpmp node that needs to be queried to get
>> +      operating point data for all CPUs.
>> +
>> +      Optional for systems that have a "compatible"
>> +      property value of "nvidia,tegra194-ccplex".
> 
> The schema says this already.
> 
Removed this text from here.

>> +
>> +  "#address-cells":
>> +    const: 1
> 
> This is wrong. The binding says it's 2 cells on aarch64 cpus though we
> don't enforce that.
>Removed.

>> +
>> +  "#size-cells":
>> +    const: 0
>> +
>> +dependencies:
>> +  nvidia,bpmp: [compatible]
> 
> This is kind of redundant as 'compatible' is required in order to apply
> the schema.
>
Removed this as well.

>> +
>> +examples:
>> +  - |
>> +    cpus {
>> +      compatible = "nvidia,tegra194-ccplex";
>> +      nvidia,bpmp = <&bpmp>;
>> +      #address-cells = <1>;
>> +      #size-cells = <0>;
>> +
>> +      cpu0_0: cpu@0 {
>> +        compatible = "nvidia,tegra194-carmel";
>> +        device_type = "cpu";
>> +        reg = <0x0>;
>> +        enable-method = "psci";
>> +      };
>> +
>> +      cpu0_1: cpu@1 {
>> +        compatible = "nvidia,tegra194-carmel";
>> +        device_type = "cpu";
>> +        reg = <0x001>;
>> +        enable-method = "psci";
>> +      };
>> +
>> +      cpu1_0: cpu@100 {
>> +        compatible = "nvidia,tegra194-carmel";
>> +        device_type = "cpu";
>> +        reg = <0x100>;
>> +        enable-method = "psci";
>> +      };
>> +
>> +      cpu1_1: cpu@101 {
>> +        compatible = "nvidia,tegra194-carmel";
>> +        device_type = "cpu";
>> +        reg = <0x101>;
>> +        enable-method = "psci";
>> +      };
>> +
>> +      cpu2_0: cpu@200 {
>> +        compatible = "nvidia,tegra194-carmel";
>> +        device_type = "cpu";
>> +        reg = <0x200>;
>> +        enable-method = "psci";
>> +      };
>> +
>> +      cpu2_1: cpu@201 {
>> +        compatible = "nvidia,tegra194-carmel";
>> +        device_type = "cpu";
>> +        reg = <0x201>;
>> +        enable-method = "psci";
>> +      };
>> +
>> +      cpu3_0: cpu@300 {
>> +        compatible = "nvidia,tegra194-carmel";
>> +        device_type = "cpu";
>> +        reg = <0x300>;
>> +        enable-method = "psci";
>> +      };
>> +
>> +      cpu3_1: cpu@301 {
>> +        compatible = "nvidia,tegra194-carmel";
>> +        device_type = "cpu";
>> +        reg = <0x301>;
>> +        enable-method = "psci";
>> +       };
> 
> Not really that useful describing all these cpus.
> 
Ok. Kept first four cpu nodes only.

>> +    };
>> +...
>> --
>> 2.7.4
>>