linux-kernel - Re: [PATCH v2 1/2] dt-bindings: PCI: qcom: Add SM8550 compatible

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Message-ID: <Y8fuUI4xaNkADkWl@hovoldconsulting.com>
Date:   Wed, 18 Jan 2023 14:04:16 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Abel Vesa <abel.vesa@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] dt-bindings: PCI: qcom: Add SM8550 compatible

On Wed, Jan 18, 2023 at 01:17:03PM +0200, Abel Vesa wrote:
> Add the SM8550 platform to the binding.
> 
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---
> 
> The v1 was here:
> https://lore.kernel.org/all/20221116123505.2760397-1-abel.vesa@linaro.org/
> 
> Changes since v1:
>  * Switched to single compatible for both PCIes (qcom,pcie-sm8550)
>  * dropped enable-gpios property
>  * dropped interconnects related properties, the power-domains properties
>    and resets related properties the sm8550 specific allOf:if:then
>  * dropped pipe_mux, phy_pipe and ref clocks from the sm8550 specific
>    allOf:if:then clock-names array and decreased the minItems and
>    maxItems for clocks property accordingly
> 
>  .../devicetree/bindings/pci/qcom,pcie.yaml    | 37 +++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
> index a5859bb3dc28..78e8babd11d9 100644
> --- a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
> @@ -34,6 +34,7 @@ properties:
>        - qcom,pcie-sm8250
>        - qcom,pcie-sm8450-pcie0
>        - qcom,pcie-sm8450-pcie1
> +      - qcom,pcie-sm8550
>        - qcom,pcie-ipq6018
>  
>    reg:
> @@ -197,6 +198,7 @@ allOf:
>                - qcom,pcie-sm8250
>                - qcom,pcie-sm8450-pcie0
>                - qcom,pcie-sm8450-pcie1
> +              - qcom,pcie-sm8550
>      then:
>        properties:
>          reg:
> @@ -611,6 +613,40 @@ allOf:
>            items:
>              - const: pci # PCIe core reset
>  
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,pcie-sm8550
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 8
> +          maxItems: 9
> +        clock-names:
> +          items:
> +            - const: pipe # PIPE clock

The pipe clock is managed by the PHY and should not be here either.

> +            - const: aux # Auxiliary clock
> +            - const: cfg # Configuration clock
> +            - const: bus_master # Master AXI clock
> +            - const: bus_slave # Slave AXI clock
> +            - const: slave_q2a # Slave Q2A clock
> +            - const: ddrss_sf_tbu # PCIe SF TBU clock
> +            - const: aggre # Aggre NoC PCIe0 AXI clock

The comment referring to a specific controller instance (PCIe0) looks
wrong.

We used a noc_ prefix to separate it from the cnoc_ clocks for sc8280xp
(e.g. noc_aggr_4).

> +            - const: cnoc_pcie_sf_axi # Config NoC PCIe1 AXI clock

The _pcie infix looks unnecessary, same comment about PCIe1 as above.

> +        iommus:
> +          maxItems: 1
> +        iommu-map:
> +          maxItems: 2
> +        resets:
> +          minItems: 1
> +          maxItems: 2
> +        reset-names:
> +          items:
> +            - const: pci # PCIe core reset
> +            - const: pcie_1_link_down_reset # PCIe link down reset

No need to repeat the resource type in the name. Shouldn't this just be
'link_down' or similar?

> +
>    - if:
>        properties:
>          compatible:
> @@ -694,6 +730,7 @@ allOf:
>                - qcom,pcie-sm8250
>                - qcom,pcie-sm8450-pcie0
>                - qcom,pcie-sm8450-pcie1
> +              - qcom,pcie-sm8550
>      then:
>        oneOf:
>          - properties:

Johan