[PATCH v3 03/10] dt-bindings: PCI: Add ASPEED PCIe RC support

[Rob Herring]

On Mon, Sep 01, 2025 at 01:59:15PM +0800, Jacky Chou wrote:
> ASPEED AST2600 provides one PCIe RC for Gen2 and AST2700 provides three
> PCIe RC for two Gen4 and one Gen2. All of these RCs have just one root
> port to connect to PCIe device. And also have Mem, I/O access, legacy
> interrupt and MSI.
> 
> Signed-off-by: Jacky Chou <jacky_chou at aspeedtech.com>
> ---
>  .../bindings/pci/aspeed,ast2600-pcie.yaml     | 179 ++++++++++++++++++
>  1 file changed, 179 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/aspeed,ast2600-pcie.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pci/aspeed,ast2600-pcie.yaml b/Documentation/devicetree/bindings/pci/aspeed,ast2600-pcie.yaml
> new file mode 100644
> index 000000000000..fe75bf2961c8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/aspeed,ast2600-pcie.yaml
> @@ -0,0 +1,179 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/aspeed,ast2600-pcie.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ASPEED PCIe Root Complex Controller
> +
> +maintainers:
> +  - Jacky Chou <jacky_chou at aspeedtech.com>
> +
> +description:
> +  The ASPEED PCIe Root Complex controller provides PCI Express Root Complex
> +  functionality for ASPEED SoCs, such as the AST2600 and AST2700.
> +  This controller enables connectivity to PCIe endpoint devices, supporting
> +  memory and I/O windows, MSI and legacy interrupts, and integration with
> +  the SoC's clock, reset, and pinctrl subsystems.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - aspeed,ast2600-pcie
> +      - aspeed,ast2700-pcie
> +
> +  reg:
> +    maxItems: 1
> +
> +  ranges:
> +    minItems: 2
> +    maxItems: 2
> +
> +  interrupts:
> +    maxItems: 1
> +    description: IntX and MSI interrupt
> +
> +  resets:
> +    items:
> +      - description: PCIe controller reset
> +
> +  reset-names:
> +    items:
> +      - const: h2x
> +
> +  msi-parent: true
> +
> +  aspeed,ahbc:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to the ASPEED AHB Controller (AHBC) syscon node.
> +      This reference is used by the PCIe controller to access
> +      system-level configuration registers related to the AHB bus.
> +      To enable AHB access for the PCIe controller.
> +
> +  aspeed,pciecfg:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to the ASPEED PCIe configuration syscon node.
> +      This reference allows the PCIe controller to access
> +      SoC-specific PCIe configuration registers. There are the others
> +      functions such PCIe RC and PCIe EP will use this common register
> +      to configure the SoC interfaces.
> +
> +  interrupt-controller:
> +    description: Interrupt controller node for handling legacy PCI interrupts.
> +    type: object
> +    properties:
> +      '#address-cells':
> +        const: 0
> +      '#interrupt-cells':
> +        const: 1
> +      interrupt-controller: true
> +
> +    required:
> +      - '#address-cells'
> +      - '#interrupt-cells'
> +      - interrupt-controller
> +
> +    additionalProperties: false
> +
> +allOf:
> +  - $ref: /schemas/pci/pci-host-bridge.yaml#
> +  - $ref: /schemas/interrupt-controller/msi-controller.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: aspeed,ast2600-pcie
> +    then:
> +      required:
> +        - aspeed,ahbc
> +    else:
> +      properties:
> +        aspeed,ahbc: false
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: aspeed,ast2700-pcie
> +    then:
> +      required:
> +        - aspeed,pciecfg
> +    else:
> +      properties:
> +        aspeed,pciecfg: false
> +
> +required:
> +  - reg
> +  - interrupts
> +  - bus-range
> +  - ranges
> +  - resets
> +  - reset-names
> +  - msi-parent
> +  - msi-controller
> +  - interrupt-map-mask
> +  - interrupt-map
> +  - interrupt-controller
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/ast2600-clock.h>
> +
> +    apb {
> +      #address-cells = <1>;
> +      #size-cells = <1>;

No need to show this node.

> +
> +      pcie0: pcie at 1e770000 {
> +        compatible = "aspeed,ast2600-pcie";
> +        device_type = "pci";
> +        reg = <0x1e770000 0x100>;
> +        linux,pci-domain = <0>;
> +        #address-cells = <3>;
> +        #size-cells = <2>;
> +        interrupts = <GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>;
> +        bus-range = <0x80 0xff>;
> +
> +        ranges = <0x01000000 0x0 0x00018000 0x00018000 0x0 0x00008000
> +            0x02000000 0x0 0x70000000 0x70000000 0x0 0x10000000>;
> +
> +        status = "disabled";

Examples should be enabled. Drop.

> +
> +        resets = <&syscon ASPEED_RESET_H2X>;
> +        reset-names = "h2x";
> +
> +        #interrupt-cells = <1>;
> +        msi-parent = <&pcie0>;

There shouldn't be any need to point to yourself.

> +        msi-controller;
> +
> +        aspeed,ahbc = <&ahbc>;
> +
> +        interrupt-map-mask = <0 0 0 7>;
> +        interrupt-map = <0 0 0 1 &pcie_intc0 0>,
> +                        <0 0 0 2 &pcie_intc0 1>,
> +                        <0 0 0 3 &pcie_intc0 2>,
> +                        <0 0 0 4 &pcie_intc0 3>;
> +        pcie_intc0: interrupt-controller {
> +          interrupt-controller;
> +          #address-cells = <0>;
> +          #interrupt-cells = <1>;
> +        };
> +
> +        pcie at 8,0 {
> +          reg = <0x804000 0 0 0 0>;
> +          #address-cells = <3>;
> +          #size-cells = <2>;
> +          device_type = "pci";
> +          resets = <&syscon ASPEED_RESET_PCIE_RC_O>;
> +          reset-names = "perst";
> +          clocks = <&syscon ASPEED_CLK_GATE_BCLK>;
> +          pinctrl-names = "default";
> +          pinctrl-0 = <&pinctrl_pcierc1_default>;
> +          phys = <&pcie_phy1>;
> +          ranges;
> +        };
> +      };
> +    };
> -- 
> 2.43.0
>