linux-kernel - Re: [PATCH v7 08/13] dt-bindings: PCI: Add CIX Sky1 PCIe Root Complex bindings

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Message-ID: <20250813154410.GB114155-robh@kernel.org>
Date: Wed, 13 Aug 2025 10:44:10 -0500
From: Rob Herring <robh@...nel.org>
To: hans.zhang@...tech.com
Cc: bhelgaas@...gle.com, lpieralisi@...nel.org, kw@...ux.com,
	mani@...nel.org, kwilczynski@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, mpillai@...ence.com, fugang.duan@...tech.com,
	guoyin.chen@...tech.com, peter.chen@...tech.com,
	cix-kernel-upstream@...tech.com, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 08/13] dt-bindings: PCI: Add CIX Sky1 PCIe Root
 Complex bindings

On Wed, Aug 13, 2025 at 12:23:26PM +0800, hans.zhang@...tech.com wrote:
> From: Hans Zhang <hans.zhang@...tech.com>
> 
> Document the bindings for CIX Sky1 PCIe Controller configured in
> root complex mode with five root port.
> 
> Supports 4 INTx, MSI and MSI-x interrupts from the ARM GICv3 controller.
> 
> Signed-off-by: Hans Zhang <hans.zhang@...tech.com>
> ---
>  .../bindings/pci/cix,sky1-pcie-host.yaml      | 79 +++++++++++++++++++
>  1 file changed, 79 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/cix,sky1-pcie-host.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pci/cix,sky1-pcie-host.yaml b/Documentation/devicetree/bindings/pci/cix,sky1-pcie-host.yaml
> new file mode 100644
> index 000000000000..2bd66603ac24
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/cix,sky1-pcie-host.yaml
> @@ -0,0 +1,79 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/cix,sky1-pcie-host.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: CIX Sky1 PCIe Root Complex
> +
> +maintainers:
> +  - Hans Zhang <hans.zhang@...tech.com>
> +
> +description:
> +  PCIe root complex controller based on the Cadence PCIe core.
> +
> +allOf:
> +  - $ref: /schemas/pci/pci-host-bridge.yaml#
> +
> +properties:
> +  compatible:
> +    const: cix,sky1-pcie-host
> +
> +  reg:
> +    items:
> +      - description: PCIe controller registers.
> +      - description: ECAM registers.
> +      - description: Remote CIX System Unit registers.
> +      - description: Region for sending messages registers.
> +
> +  reg-names:
> +    items:
> +      - const: reg
> +      - const: cfg
> +      - const: rcsu
> +      - const: msg
> +
> +  ranges:
> +    maxItems: 3
> +
> +required:
> +  - compatible
> +  - ranges
> +  - bus-range
> +  - device_type
> +  - interrupt-map
> +  - interrupt-map-mask
> +  - msi-map
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    / {

bus {

> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +
> +      pcie@...0000 {
> +          compatible = "cix,sky1-pcie-host";
> +          reg = <0x00 0x0a010000 0x00 0x10000>,
> +                <0x00 0x2c000000 0x00 0x4000000>,
> +                <0x00 0x0a000000 0x00 0x10000>,
> +                <0x00 0x60000000 0x00 0x00100000>;
> +          reg-names = "reg", "cfg", "rcsu", "msg";
> +          ranges = <0x01000000 0x00 0x60100000 0x00 0x60100000 0x00 0x00100000>,
> +                  <0x02000000 0x00 0x60200000 0x00 0x60200000 0x00 0x1fe00000>,
> +                  <0x43000000 0x18 0x00000000 0x18 0x00000000 0x04 0x00000000>;
> +          #address-cells = <3>;
> +          #size-cells = <2>;
> +          bus-range = <0xc0 0xff>;
> +          device_type = "pci";
> +          #interrupt-cells = <1>;
> +          interrupt-map-mask = <0 0 0 0x7>;
> +          interrupt-map = <0 0 0 1 &gic 0 0 GIC_SPI 407 IRQ_TYPE_LEVEL_HIGH 0>,
> +                          <0 0 0 2 &gic 0 0 GIC_SPI 408 IRQ_TYPE_LEVEL_HIGH 0>,
> +                          <0 0 0 3 &gic 0 0 GIC_SPI 409 IRQ_TYPE_LEVEL_HIGH 0>,
> +                          <0 0 0 4 &gic 0 0 GIC_SPI 410 IRQ_TYPE_LEVEL_HIGH 0>;
> +          msi-map = <0xc000 &gic_its 0xc000 0x4000>;
> +      };
> +    };
> -- 
> 2.49.0
>