Re: [PATCH 3/7] dt-bindings: pci: Add document for ASPEED PCIe RC

[Krzysztof Kozlowski]

On 13/06/2025 05:29, Jacky Chou wrote:
> Add device tree binding documentation for the ASPEED PCIe Root Complex
> controller. This binding describes the required and optional properties
> for configuring the PCIe RC node, including support for syscon phandles,
> MSI, clocks, resets, and interrupt mapping. The schema enforces strict
> property validation and provides a comprehensive example for reference.
> 
> Signed-off-by: Jacky Chou <jacky_chou@xxxxxxxxxxxxxx>
> ---
>  .../devicetree/bindings/pci/aspeed-pcie.yaml  | 159 ++++++++++++++++++
>  1 file changed, 159 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/aspeed-pcie.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pci/aspeed-pcie.yaml b/Documentation/devicetree/bindings/pci/aspeed-pcie.yaml
> new file mode 100644
> index 000000000000..5b50a9e2d472
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/aspeed-pcie.yaml

Same comments.

> @@ -0,0 +1,159 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/aspeed-pcie.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ASPEED PCIe Root Complex Controller
> +
> +maintainers:
> +  - Jacky Chou <jacky_chou@xxxxxxxxxxxxxx>
> +
> +description: |

Do not need '|' unless you need to preserve formatting.


> +  Device tree binding for the ASPEED PCIe Root Complex controller.

No, describe the hardware. Your current description is 100% redundant.
It is never useful to say in DT binding description that it is a DT
binding. It cannot be anything else, can it?

> +
> +properties:
> +  compatible:
> +    enum:
> +      - aspeed,ast2600-pcie
> +      - aspeed,ast2700-pcie
> +
> +  device_type:
> +    const: pci

You need to include proper pci schema and drop all redundant properties.

Look at other schemas.

> +
> +  reg:
> +    maxItems: 1
> +
> +  ranges:
> +    minItems: 2
> +    maxItems: 2
> +
> +  interrupts:
> +    description: IntX and MSI interrupt

Need to list the items. Look at other schemas.

> +
> +  resets:
> +    items:
> +      - description: Module reset
> +      - description: PCIe PERST
> +
> +  reset-names:
> +    items:
> +      - const: h2x
> +      - const: perst
> +
> +  msi-parent: true
> +
> +  msi_address:

Where is this property defined?  I do not see in kernel nor in dtschema.
Drop and use existing properties. I am not even talking about coding
style...

> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: MSI address
> +
> +  aspeed,ahbc:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: Phandle to ASPEED AHBC syscon.

For what purpose?

> +
> +  aspeed,pciecfg:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: Phandle to ASPEED PCIe configuration syscon.

For what purpose?

> +
> +  aspeed,pciephy:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: Phandle to ASPEED PCIe PHY syscon.

For what purpose?

> +
> +  clocks:
> +    description: PCIe BUS clock

Missing constraints.

Just open any other  binding and do not implement things diferently.

> +
> +  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-bus.yaml#
> +  - $ref: /schemas/interrupt-controller/msi-controller.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: aspeed,ast2600-pcie
> +    then:
> +      required:
> +        - aspeed,ahbc

else: make it false

> +
> +required:
> +  - interrupts
> +  - bus-range
> +  - ranges
> +  - resets
> +  - reset-names
> +  - msi-parent
> +  - msi-controller
> +  - aspeed,pciephy
> +  - aspeed,pciecfg
> +  - interrupt-map-mask
> +  - interrupt-map
> +  - interrupt-controller

Messed order, missing properties. Open other bindings...

> +
> +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>;
> +
> +      pcie0: pcie@1e7700C0 {
> +        compatible = "aspeed,ast2600-pcie";
> +        device_type = "pci";
> +        reg = <0x1e7700C0 0x40>;

Lower case hex. Please follow carefully DTS coding style.



Best regards,
Krzysztof