linux-kernel - Re: [PATCH v3 3/4] dt-bindings: PCI: qcom,pcie-sa8255p: Document ECAM compliant PCIe root complex

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Message-ID: <20241115105546.77l3ie5iuajpbuof@thinkpad>
Date: Fri, 15 Nov 2024 16:25:46 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Mayank Rana <quic_mrana@...cinc.com>
Cc: jingoohan1@...il.com, will@...nel.org, lpieralisi@...nel.org,
	kw@...ux.com, robh@...nel.org, bhelgaas@...gle.com, krzk@...nel.org,
	linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org, quic_krichai@...cinc.com
Subject: Re: [PATCH v3 3/4] dt-bindings: PCI: qcom,pcie-sa8255p: Document
 ECAM compliant PCIe root complex

On Wed, Nov 06, 2024 at 02:13:40PM -0800, Mayank Rana wrote:
> On SA8255p, PCIe root complex is managed by firmware using power-domain
> based handling. This root complex is configured as ECAM compliant.
> Document required configuration to enable PCIe root complex.
> 
> Signed-off-by: Mayank Rana <quic_mrana@...cinc.com>
> ---
>  .../bindings/pci/qcom,pcie-sa8255p.yaml       | 103 ++++++++++++++++++
>  1 file changed, 103 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/qcom,pcie-sa8255p.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-sa8255p.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie-sa8255p.yaml
> new file mode 100644
> index 000000000000..9b09c3923ba0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie-sa8255p.yaml
> @@ -0,0 +1,103 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/qcom,pcie-sa8255p.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm SA8255p based firmware managed and ECAM compliant PCIe Root Complex
> +
> +maintainers:
> +  - Bjorn Andersson <andersson@...nel.org>
> +  - Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> +
> +description:
> +  Qualcomm SA8255p SoC PCIe root complex controller is based on the Synopsys
> +  DesignWare PCIe IP which is managed by firmware, and configured in ECAM mode.
> +
> +properties:
> +  compatible:
> +    const: qcom,pcie-sa8255p
> +
> +  reg:
> +    description:
> +      The Configuration Space base address and size, as accessed from the parent
> +      bus. The base address corresponds to the first bus in the "bus-range"
> +      property. If no "bus-range" is specified, this will be bus 0 (the
> +      default).

I don't think the 'no bus-range' configuration is supported. You can get rid if
this statement.

> +    maxItems: 1
> +
> +  ranges:
> +    description:
> +      As described in IEEE Std 1275-1994, but must provide at least a
> +      definition of non-prefetchable memory. One or both of prefetchable Memory
> +      may also be provided.
> +    minItems: 1
> +    maxItems: 2
> +
> +  interrupts:
> +    minItems: 8
> +    maxItems: 8
> +
> +  interrupt-names:
> +    items:
> +      - const: msi0
> +      - const: msi1
> +      - const: msi2
> +      - const: msi3
> +      - const: msi4
> +      - const: msi5
> +      - const: msi6
> +      - const: msi7
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  dma-coherent: true
> +  iommu-map: true

Can't you add 'msi-map' also since the hardware supports it?

- Mani

> +
> +required:
> +  - compatible
> +  - reg
> +  - ranges
> +  - power-domains
> +
> +allOf:
> +  - $ref: /schemas/pci/pci-host-bridge.yaml#
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        pci@...0000 {
> +           compatible = "qcom,pcie-sa8255p";
> +           reg = <0x4 0x00000000 0 0x10000000>;
> +           device_type = "pci";
> +           #address-cells = <3>;
> +           #size-cells = <2>;
> +           ranges = <0x02000000 0x0 0x40100000 0x0 0x40100000 0x0 0x1ff00000>,
> +                    <0x43000000 0x4 0x10100000 0x4 0x10100000 0x0 0x40000000>;
> +           bus-range = <0x00 0xff>;
> +           dma-coherent;
> +           linux,pci-domain = <0>;
> +           power-domains = <&scmi5_pd 0>;
> +           iommu-map = <0x0 &pcie_smmu 0x0000 0x1>,
> +                       <0x100 &pcie_smmu 0x0001 0x1>;
> +           interrupt-parent = <&intc>;
> +           interrupts = <GIC_SPI 307 IRQ_TYPE_LEVEL_HIGH>,
> +                        <GIC_SPI 308 IRQ_TYPE_LEVEL_HIGH>,
> +                        <GIC_SPI 309 IRQ_TYPE_LEVEL_HIGH>,
> +                        <GIC_SPI 312 IRQ_TYPE_LEVEL_HIGH>,
> +                        <GIC_SPI 313 IRQ_TYPE_LEVEL_HIGH>,
> +                        <GIC_SPI 314 IRQ_TYPE_LEVEL_HIGH>,
> +                        <GIC_SPI 374 IRQ_TYPE_LEVEL_HIGH>,
> +                        <GIC_SPI 375 IRQ_TYPE_LEVEL_HIGH>;
> +           interrupt-names = "msi0", "msi1", "msi2", "msi3",
> +                                  "msi4", "msi5", "msi6", "msi7";
> +        };
> +    };
> -- 
> 2.25.1
> 

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