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Message-ID: <bfa6150b-e27e-41c3-a1a7-41e46f52f6ea@linaro.org>
Date: Fri, 29 Mar 2024 20:27:44 +0100
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Subject: Re: [PATCH] dt-bindings: pci: altera: covert to yaml
To: matthew.gerlach@linux.intel.com, joyce.ooi@intel.com,
 bhelgaas@google.com, lpieralisi@kernel.org, kw@linux.com, robh@kernel.org,
 krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
 linux-pci@vger.kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org
References: <20240329170031.3379524-1-matthew.gerlach@linux.intel.com>
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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <20240329170031.3379524-1-matthew.gerlach@linux.intel.com>
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On 29/03/2024 18:00, matthew.gerlach@linux.intel.com wrote:
> From: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> 
> Covert the device tree bindings for the Altera Root
> Port controller from text to yaml.
> 
> Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> ---

..

> diff --git a/Documentation/devicetree/bindings/pci/altr,pcie-root-port.yaml b/Documentation/devicetree/bindings/pci/altr,pcie-root-port.yaml
> new file mode 100644
> index 000000000000..8f1ad1362ad1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/altr,pcie-root-port.yaml
> @@ -0,0 +1,106 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright (C) 2024, Intel Corporation
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/altr,pcie-root-port.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Altera PCIe Root Port
> +
> +maintainers:
> +  - Matthew Gerlach <matthew.gerlach@linux.intel.com>
> +
> +allOf:
> +  - $ref: /schemas/pci/pci-bus.yaml#
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - altr,pcie-root-port-1.0
> +          - altr,pcie-root-port-2.0
> +
> +  reg:
> +    minItems: 2
> +    maxItems: 3
> +
> +  reg-names:
> +    description:
> +      TX slave port region (Txs)
> +      Control register access region (Cra)
> +      Hard IP region if altr,pcie-root-port-2.0 (Hip)

All these go to reg as description of items.

Both - reg and reg-names - need constraints per variant in
allOf:if:then:. Move allOf: to bottom of file, just like example-schema
is showing.


> + 
> +    items:
> +      - const: Txs
> +      - const: Cra
> +      - const: Hip
> +    minItems: 2
> +
> +  device_type:
> +    const: pci

I don't think you need it.

> +
> +  "#address-cells":
> +    const: 3

Drop

> +
> +  "#size-cells":
> +    const: 2

Drop

> +
> +  interrupts:
> +    minItems: 1

This should be maxItems.

> +
> +  interrupt-map-mask:
> +    items:
> +      - const: 0
> +      - const: 0
> +      - const: 0
> +      - const: 7

I guess as well.

> +
> +  interrupt-map:
> +    maxItems: 4
> +
> +  "#interrupt-cells":
> +    const: 1

Drop

> +
> +  msi-parent:
> +    description: Link to the hardware entity that serves as the MSI controller.

Just true.

Please open existing, recent PCI bindings and look how it is done.

> +
> +  bus-range:
> +    description: PCI bus numbers covered.

Drop

> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - device_type
> +  - "#address-cells"
> +  - "#size-cells"
> +  - interrupts
> +  - interrupt-map
> +  - interrupt-map-mask
> +  - "#interrupt-cells"

This also needs cleaning.

> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    pcie_0: pcie@c00000000 {
> +        compatible = "altr,pcie-root-port-1.0";
> +        reg = <0xc0000000 0x20000000>,
> +            <0xff220000 0x00004000>;

Misaligned.

> +        reg-names = "Txs", "Cra";
> +        interrupt-parent = <&hps_0_arm_gic_0>;
> +        interrupts = <0 40 4>;

Use defines for common constnats.

> +        #interrupt-cells = <1>;
> +        bus-range = <0x0 0xFF>;

Lowercase hex

> +        device_type = "pci";
> +        msi-parent = <&msi_to_gic_gen_0>;
> +        #address-cells = <3>;
> +        #size-cells = <2>;
> +        interrupt-map-mask = <0 0 0 7>;
> +        interrupt-map = <0 0 0 1 &pcie_intc 1>,
> +                        <0 0 0 2 &pcie_intc 2>,
> +                        <0 0 0 3 &pcie_intc 3>,
> +                        <0 0 0 4 &pcie_intc 4>;
> +        ranges = <0x82000000 0x00000000 0x00000000 0xc0000000 0x00000000 0x10000000
> +              0x82000000 0x00000000 0x10000000 0xd0000000 0x00000000 0x10000000>;

Misaligned.


Best regards,
Krzysztof