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

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Message-ID: <429fd44a-34e1-be31-2c6c-c1106e3c98cb@kernel.org>
Date:   Thu, 17 Nov 2022 14:50:47 +0200
From:   Georgi Djakov <djakov@...nel.org>
To:     Abel Vesa <abel.vesa@...aro.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, kw@...ux.com,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: PCI: qcom: Add SM8550 to binding

Hi Abel,

On 16.11.22 14:35, Abel Vesa wrote:
> Add the SM8550 platform to the binding.
> 
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---
>   .../devicetree/bindings/pci/qcom,pcie.yaml    | 96 +++++++++++++++++++
>   1 file changed, 96 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
> index 54f07852d279..efa01a8411c4 100644
> --- a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
> @@ -34,6 +34,8 @@ properties:
>         - qcom,pcie-sm8250
>         - qcom,pcie-sm8450-pcie0
>         - qcom,pcie-sm8450-pcie1
> +      - qcom,pcie-sm8550-pcie0
> +      - qcom,pcie-sm8550-pcie1
>         - qcom,pcie-ipq6018
>   
>     reg:
> @@ -92,6 +94,10 @@ properties:
>     power-domains:
>       maxItems: 1
>   
> +  enable-gpios:
> +    description: GPIO controlled connection to ENABLE# signal
> +    maxItems: 1
> +
>     perst-gpios:
>       description: GPIO controlled connection to PERST# signal
>       maxItems: 1
> @@ -187,6 +193,8 @@ allOf:
>                 - qcom,pcie-sm8250
>                 - qcom,pcie-sm8450-pcie0
>                 - qcom,pcie-sm8450-pcie1
> +              - qcom,pcie-sm8550-pcie0
> +              - qcom,pcie-sm8550-pcie1
>       then:
>         properties:
>           reg:
> @@ -601,6 +609,92 @@ allOf:
>             items:
>               - const: pci # PCIe core reset
>   
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,pcie-sm8550-pcie0
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 11
> +          maxItems: 11
> +        clock-names:
> +          items:
> +            - const: pipe # PIPE clock
> +            - const: pipe_mux # PIPE MUX
> +            - const: phy_pipe # PIPE output clock
> +            - const: ref # REFERENCE clock
> +            - 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: aggre0 # Aggre NoC PCIe0 AXI clock
> +        interconnects:
> +          maxItems: 1
> +        interconnect-names:
> +          const: icc_path
> +        iommus:
> +          maxItems: 1
> +        iommu-map:
> +          maxItems: 2
> +        power-domains:
> +          maxItems: 1
> +        power-domain-names:
> +          const: gdsc
> +        resets:
> +          maxItems: 1
> +        reset-names:
> +          items:
> +            - const: pci # PCIe core reset
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,pcie-sm8550-pcie1
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 12
> +          maxItems: 12
> +        clock-names:
> +          items:
> +            - const: pipe # PIPE clock
> +            - const: pipe_mux # PIPE MUX
> +            - const: phy_pipe # PIPE output clock
> +            - const: ref # REFERENCE clock
> +            - 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: aggre1 # Aggre NoC PCIe1 AXI clock
> +            - const: cnoc_pcie_sf_axi # Config NoC PCIe1 AXI clock
> +        interconnects:
> +          maxItems: 1
> +        interconnect-names:
> +          const: icc_path

The name of the path is too generic. Probably something like "pcie-mem" or "pcie-ddr" would be
more appropriate to indicate that this is for requesting bandwidth on the path between PCIE and
DDR memory.

Thanks,
Georgi

> +        iommus:
> +          maxItems: 1
> +        iommu-map:
> +          maxItems: 2
> +        power-domains:
> +          maxItems: 1
> +        power-domain-names:
> +          const: gdsc
> +        resets:
> +          maxItems: 2
> +        reset-names:
> +          items:
> +            - const: pci # PCIe core reset
> +            - const: pcie_1_link_down_reset # PCIe link down reset
> +
>     - if:
>         properties:
>           compatible:
> @@ -672,6 +766,8 @@ allOf:
>                 - qcom,pcie-sm8250
>                 - qcom,pcie-sm8450-pcie0
>                 - qcom,pcie-sm8450-pcie1
> +              - qcom,pcie-sm8550-pcie0
> +              - qcom,pcie-sm8550-pcie1
>       then:
>         oneOf:
>           - properties: