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Date: Wed, 19 Oct 2022 11:04:10 -0400
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Thippeswamy Havalige <thippeswamy.havalige@....com>,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, krzysztof.kozlowski+dt@...aro.org
Cc: bhelgaas@...gle.com, michals@...inx.com, robh+dt@...nel.org,
bharat.kumar.gogada@....com
Subject: Re: [PATCH 1/2] dt-bindings: PCI: xilinx-pcie: Convert to YAML
schemas of Xilinx AXI PCIe Root Port Bridge
On 19/10/2022 10:46, Thippeswamy Havalige wrote:
> Convert to YAML dtschemas of Xilinx AXI PCIe Root Port Bridge
> dt binding.
>
> Signed-off-by: Thippeswamy Havalige <thippeswamy.havalige@....com>
> ---
> .../devicetree/bindings/pci/xilinx-pcie.txt | 88 -------------------
> .../devicetree/bindings/pci/xilinx-pcie.yaml | 81 +++++++++++++++++
> 2 files changed, 81 insertions(+), 88 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/pci/xilinx-pcie.txt
> create mode 100644 Documentation/devicetree/bindings/pci/xilinx-pcie.yaml
>
> diff --git a/Documentation/devicetree/bindings/pci/xilinx-pcie.txt b/Documentation/devicetree/bindings/pci/xilinx-pcie.txt
> deleted file mode 100644
> index fd57a81180a4..000000000000
> --- a/Documentation/devicetree/bindings/pci/xilinx-pcie.txt
> +++ /dev/null
> @@ -1,88 +0,0 @@
> -* Xilinx AXI PCIe Root Port Bridge DT description
> -
> -Required properties:
> -- #address-cells: Address representation for root ports, set to <3>
> -- #size-cells: Size representation for root ports, set to <2>
> -- #interrupt-cells: specifies the number of cells needed to encode an
> - interrupt source. The value must be 1.
> -- compatible: Should contain "xlnx,axi-pcie-host-1.00.a"
> -- reg: Should contain AXI PCIe registers location and length
> -- device_type: must be "pci"
> -- interrupts: Should contain AXI PCIe interrupt
> -- interrupt-map-mask,
> - interrupt-map: standard PCI properties to define the mapping of the
> - PCI interface to interrupt numbers.
> -- ranges: ranges for the PCI memory regions (I/O space region is not
> - supported by hardware)
> - Please refer to the standard PCI bus binding document for a more
> - detailed explanation
> -
> -Optional properties for Zynq/Microblaze:
> -- bus-range: PCI bus numbers covered
> -
> -Interrupt controller child node
> -+++++++++++++++++++++++++++++++
> -Required properties:
> -- interrupt-controller: identifies the node as an interrupt controller
> -- #address-cells: specifies the number of cells needed to encode an
> - address. The value must be 0.
> -- #interrupt-cells: specifies the number of cells needed to encode an
> - interrupt source. The value must be 1.
> -
> -NOTE:
> -The core provides a single interrupt for both INTx/MSI messages. So,
> -created a interrupt controller node to support 'interrupt-map' DT
> -functionality. The driver will create an IRQ domain for this map, decode
> -the four INTx interrupts in ISR and route them to this domain.
> -
> -
> -Example:
> -++++++++
> -Zynq:
> - pci_express: axi-pcie@...00000 {
> - #address-cells = <3>;
> - #size-cells = <2>;
> - #interrupt-cells = <1>;
> - compatible = "xlnx,axi-pcie-host-1.00.a";
> - reg = < 0x50000000 0x1000000 >;
> - device_type = "pci";
> - interrupts = < 0 52 4 >;
> - 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 = < 0x02000000 0 0x60000000 0x60000000 0 0x10000000 >;
> -
> - pcie_intc: interrupt-controller {
> - interrupt-controller;
> - #address-cells = <0>;
> - #interrupt-cells = <1>;
> - };
> - };
> -
> -
> -Microblaze:
> - pci_express: axi-pcie@...00000 {
> - #address-cells = <3>;
> - #size-cells = <2>;
> - #interrupt-cells = <1>;
> - compatible = "xlnx,axi-pcie-host-1.00.a";
> - reg = <0x10000000 0x4000000>;
> - device_type = "pci";
> - interrupt-parent = <µblaze_0_intc>;
> - interrupts = <1 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 = <0x02000000 0x00000000 0x80000000 0x80000000 0x00000000 0x10000000>;
> -
> - pcie_intc: interrupt-controller {
> - interrupt-controller;
> - #address-cells = <0>;
> - #interrupt-cells = <1>;
> - };
> -
> - };
> diff --git a/Documentation/devicetree/bindings/pci/xilinx-pcie.yaml b/Documentation/devicetree/bindings/pci/xilinx-pcie.yaml
> new file mode 100644
> index 000000000000..6b372ac1763e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/xilinx-pcie.yaml
> @@ -0,0 +1,81 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/xilinx-pcie.yaml#
Filename based on compatible, so:
xlnx,axi-pcie-host.yaml
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Xilinx AXI PCIe Root Port Bridge DT description
Drop "DT description"
> +
> +maintainers:
> + - Thippeswamy Havalige <thippesw@...inx.com>
> +
> +allOf:
> + - $ref: /schemas/pci/pci-bus.yaml#
> +
> +properties:
> + compatible:
> + const: xlnx,axi-pcie-host-1.00.a
> +
> + reg:
> + items:
> + - description: should contain AXI PCIe registers location and length
Drop description, just maxItems: 1
> +
> + interrupts:
> + items:
> + - description: should contain AXI PCIe interrupt
Ditto
> +
> + ranges:
> + items:
> + - description: |
> + ranges for the PCI memory regions (I/O space region is not
> + supported by hardware)
> +
> + "#interrupt-cells":
> + const: 1
> +
> + interrupt-controller:
> + description: identifies the node as an interrupt controller
> + type: object
additionalProperties: false
> + properties:
> + "interrupt-controller": true
> + "#address-cells":
> + const: 0
> + "#interrupt-cells":
> + const: 1
Add also required properties for this node.
> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> + - ranges
> + - device_type
> + - interrupt-map
> + - "#interrupt-cells"
> + - interrupt-controller
> +
> +unevaluatedProperties: false
> +
> +examples:
> + - |
> +
> + Zynq:
> + pci_express: pcie@...00000 {
> + #address-cells = <3>;
Use 4 spaces for example indentation.
> + #size-cells = <2>;
> + #interrupt-cells = <1>;
> + compatible = "xlnx,axi-pcie-host-1.00.a";
> + reg = < 0x50000000 0x1000000 >;
Fix style.
compatible goes first, then reg, then the rest.
> + device_type = "pci";
> + interrupts = < 0 52 4 >;
Fix the style, use defines.
> + 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 = < 0x02000000 0 0x60000000 0x60000000 0 0x10000000 >;
Original example looked correct, so how did it become with these spaces?
> + pcie_intc: interrupt-controller {
> + interrupt-controller;
> + #address-cells = <0>;
> + #interrupt-cells = <1>;
> + };
> + };
Best regards,
Krzysztof
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