linux-kernel - Re: [PATCH v4 1/3] dt-bindings: interconnect: Add rpmh virt devices

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Date:   Mon, 21 Nov 2022 11:39:39 -0600
From:   Melody Olvera <quic_molvera@...cinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Georgi Djakov <djakov@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     Odelu Kukatla <quic_okukatla@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/3] dt-bindings: interconnect: Add rpmh virt devices



On 11/20/2022 5:13 AM, Krzysztof Kozlowski wrote:
> On 18/11/2022 19:22, Melody Olvera wrote:
>> Add documentation for virtual rpmh devices. These interconnects
>> are not controlled by the application processor and thus
>> require separate bindings. Also, move compatibles for sm8450 to
>> this document and add them for QDU1000/QRU1000 platforms.
>>
>> Signed-off-by: Melody Olvera <quic_molvera@...cinc.com>
>> ---
>>  .../bindings/interconnect/qcom,rpmh-virt.yaml | 55 +++++++++++++++++++
>>  .../bindings/interconnect/qcom,rpmh.yaml      |  2 -
>>  2 files changed, 55 insertions(+), 2 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/interconnect/qcom,rpmh-virt.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/interconnect/qcom,rpmh-virt.yaml b/Documentation/devicetree/bindings/interconnect/qcom,rpmh-virt.yaml
>> new file mode 100644
>> index 000000000000..5cbaa51df863
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/interconnect/qcom,rpmh-virt.yaml
>> @@ -0,0 +1,55 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/interconnect/qcom,rpmh-virt.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm RPMh Virtual Network-On-Chip Interconnect
>> +
>> +maintainers:
>> +  - Georgi Djakov <georgi.djakov@...aro.org>
>> +  - Odelu Kukatla <quic_okukatla@...cinc.com>
>> +
>> +description: |
>> +   RPMh 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 point to at
>> +   least one RPMh device child node pertaining to their RSC and each provider
>> +   can map to multiple RPMh resources. Virtual interconnect providers are not
>> +   controlled by AP and do not support QoS; they should not have associated
>> +   register regions.
>> +
>> +allOf:
>> +  - $ref: qcom,rpmh-common.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - qcom,qdu1000-clk-virt
>> +      - qcom,qdu1000-mc-virt
>> +      - qcom,sm8450-clk-virt
>> +      - qcom,sm8450-mc-virt
> You should also move qcom,sdx65-mc-virt, qcom,sc8280xp-mc-virt,
> qcom,sc8280xp-clk-virt and more.

Ok. I wasn't sure since some of these entries don't seem to conform to
these bindings, even though it seems they should.

>
>> +
>> +  '#interconnect-cells': true
>> +
>> +required:
>> +  - compatible
>> +
>> +unevaluatedProperties: false
>> +
>> +examples:
>> +  - |
>> +      #include <dt-bindings/interconnect/qcom,sm8450.h>
>> +
>> +      clk_virt: interconnect-0 {
>> +             compatible = "qcom,sm8450-clk-virt";
>> +             #interconnect-cells = <2>;
>> +             qcom,bcm-voters = <&apps_bcm_voter>;
>> +      };
>> +
>> +      mc_virt: interconnect-1 {
>> +             compatible = "qcom,sm8450-mc-virt";
>> +             #interconnect-cells = <2>;
>> +             qcom,bcm-voters = <&apps_bcm_voter>;
> These are exactly the same examples, so just keep one.

Sounds good.

Thanks,
Melody
>
> Best regards,
> Krzysztof
>