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Date: Mon, 19 Feb 2024 16:36:10 -0500
From: Frank Li <Frank.li@nxp.com>
To: Lorenzo Pieralisi <lpieralisi@kernel.org>,
	Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kw@linux.com>,
	Rob Herring <robh@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	"open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS" <linux-pci@vger.kernel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" <devicetree@vger.kernel.org>,
	open list <linux-kernel@vger.kernel.org>
Cc: imx@lists.linux.dev
Subject: Re: [PATCH v3 1/1] dt-bindings: pci: layerscape-pci: Convert to yaml
 format
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On Wed, Feb 14, 2024 at 02:41:44PM -0500, Frank Li wrote:
> Convert the layerscape-pci PCIe binding document to yaml format.
> 
> Additionally, changes for the layerscape-pci endpoint part:
> - Add interrupt name 'pme' restriction for fsl,ls1028a-pcie-ep,
> fsl,ls1046a-pcie-ep, and fsl,ls1088a-pcie-ep.
> - Add register name restrictions: 'reg' and 'addr_space'. 'addr_space' is
> required by snps,dw-pcie-ep.
> - Add an example.
> 
> Changes for the layerscape-pci root complex part:
> - Add required property: 'reg-names', "#address-cells", "#size-cells",
> 'device_type', 'bus-range', 'ranges', "#interrupt-cells",
> 'interrupt-map-mask' and 'interrupt-map'.
> - Interrupt-names requirement split to each compatible string.
> - Add register name restrictions: 'reg' and 'config'. 'config' is required
> by snps,dw-pcie.

@conor
    Any comments about this one?

Frank

> 
> Signed-off-by: Frank Li <Frank.Li@nxp.com>
> ---
> 
> Notes:
>     There are log discuss at v1. If I missed something, let me know.
>     
>     Change from v2 to v3
>     - update commit message, show change compare txt file
>     - add failback compatible fsl,ls-pcie-ep.
>     - add commit message about 'addr_space' and 'config'.
>     
>     Change from v1 to v2
>     - remove '|-'
>     - dma-coherent: true
>     - add interrupts and interrupt-names at before Allof
>     - remove ref to snps,pcie*.yaml, some reg-names are not aligned with in
>     drivers
>     - Add an example for pcie-ep
> 
>  .../bindings/pci/fsl,layerscape-pcie-ep.yaml  | 110 +++++++++++
>  .../bindings/pci/fsl,layerscape-pcie.yaml     | 182 ++++++++++++++++++
>  .../bindings/pci/layerscape-pci.txt           |  79 --------
>  3 files changed, 292 insertions(+), 79 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/pci/fsl,layerscape-pcie-ep.yaml
>  create mode 100644 Documentation/devicetree/bindings/pci/fsl,layerscape-pcie.yaml
>  delete mode 100644 Documentation/devicetree/bindings/pci/layerscape-pci.txt
> 
> diff --git a/Documentation/devicetree/bindings/pci/fsl,layerscape-pcie-ep.yaml b/Documentation/devicetree/bindings/pci/fsl,layerscape-pcie-ep.yaml
> new file mode 100644
> index 0000000000000..b384a0b2fe22e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/fsl,layerscape-pcie-ep.yaml
> @@ -0,0 +1,110 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/fsl,layerscape-pcie-ep.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale Layerscape PCIe Endpoint(EP) controller
> +
> +maintainers:
> +  - Frank Li <Frank.Li@nxp.com>
> +
> +description:
> +  This PCIe EP controller is based on the Synopsys DesignWare PCIe IP.
> +
> +  This controller derives its clocks from the Reset Configuration Word (RCW)
> +  which is used to describe the PLL settings at the time of chip-reset.
> +
> +  Also as per the available Reference Manuals, there is no specific 'version'
> +  register available in the Freescale PCIe controller register set,
> +  which can allow determining the underlying DesignWare PCIe controller version
> +  information.
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - fsl,ls2088a-pcie-ep
> +          - fsl,ls1088a-pcie-ep
> +          - fsl,ls1046a-pcie-ep
> +          - fsl,ls1028a-pcie-ep
> +          - fsl,lx2160ar2-pcie-ep
> +      - const: fsl,ls-pcie-ep
> +
> +  reg:
> +    maxItems: 2
> +
> +  reg-names:
> +    items:
> +      - const: regs
> +      - const: addr_space
> +
> +  fsl,pcie-scfg:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: A phandle to the SCFG device node. The second entry is the
> +      physical PCIe controller index starting from '0'. This is used to get
> +      SCFG PEXN registers.
> +
> +  big-endian:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: If the PEX_LUT and PF register block is in big-endian, specify
> +      this property.
> +
> +  dma-coherent: true
> +
> +  interrupts:
> +    minItems: 1
> +    maxItems: 2
> +
> +  interrupt-names:
> +    minItems: 1
> +    maxItems: 2
> +    oneOf:
> +      - anyOf:
> +          - const: pme
> +          - const: aer
> +      - const: intr
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - interrupt-names
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            - fsl,ls1028a-pcie-ep
> +            - fsl,ls1046a-pcie-ep
> +            - fsl,ls1088a-pcie-ep
> +    then:
> +      properties:
> +        interrupt-names:
> +          items:
> +            - const: pme
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    soc {
> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +
> +      pcie_ep1: pcie-ep@3400000 {
> +        compatible = "fsl,ls1028a-pcie-ep", "fsl,ls-pcie-ep";
> +        reg = <0x00 0x03400000 0x0 0x00100000
> +              0x80 0x00000000 0x8 0x00000000>;
> +        reg-names = "regs", "addr_space";
> +        interrupts = <GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH>; /* PME interrupt */
> +        interrupt-names = "pme";
> +        num-ib-windows = <6>;
> +        num-ob-windows = <8>;
> +        status = "disabled";
> +      };
> +    };
> +...
> diff --git a/Documentation/devicetree/bindings/pci/fsl,layerscape-pcie.yaml b/Documentation/devicetree/bindings/pci/fsl,layerscape-pcie.yaml
> new file mode 100644
> index 0000000000000..988929729580a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/fsl,layerscape-pcie.yaml
> @@ -0,0 +1,182 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/fsl,layerscape-pcie.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale Layerscape PCIe Root Complex(RC) controller
> +
> +maintainers:
> +  - Frank Li <Frank.Li@nxp.com>
> +
> +description:
> +  This PCIe RC controller is based on the Synopsys DesignWare PCIe IP
> +
> +  This controller derives its clocks from the Reset Configuration Word (RCW)
> +  which is used to describe the PLL settings at the time of chip-reset.
> +
> +  Also as per the available Reference Manuals, there is no specific 'version'
> +  register available in the Freescale PCIe controller register set,
> +  which can allow determining the underlying DesignWare PCIe controller version
> +  information.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - fsl,ls1021a-pcie
> +      - fsl,ls2080a-pcie
> +      - fsl,ls2085a-pcie
> +      - fsl,ls2088a-pcie
> +      - fsl,ls1088a-pcie
> +      - fsl,ls1046a-pcie
> +      - fsl,ls1043a-pcie
> +      - fsl,ls1012a-pcie
> +      - fsl,ls1028a-pcie
> +      - fsl,lx2160a-pcie
> +
> +  reg:
> +    maxItems: 2
> +
> +  reg-names:
> +    items:
> +      - const: regs
> +      - const: config
> +
> +  fsl,pcie-scfg:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: A phandle to the SCFG device node. The second entry is the
> +      physical PCIe controller index starting from '0'. This is used to get
> +      SCFG PEXN registers.
> +
> +  big-endian:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: If the PEX_LUT and PF register block is in big-endian, specify
> +      this property.
> +
> +  dma-coherent: true
> +
> +  msi-parent: true
> +
> +  iommu-map: true
> +
> +  interrupts:
> +    minItems: 1
> +    maxItems: 3
> +
> +  interrupt-names:
> +    minItems: 1
> +    maxItems: 3
> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - "#address-cells"
> +  - "#size-cells"
> +  - device_type
> +  - bus-range
> +  - ranges
> +  - interrupts
> +  - interrupt-names
> +  - "#interrupt-cells"
> +  - interrupt-map-mask
> +  - interrupt-map
> +
> +allOf:
> +  - $ref: /schemas/pci/pci-bus.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            - fsl,lx2160a-pcie
> +    then:
> +      properties:
> +        interrupts:
> +          maxItems: 2
> +        interrupt-names:
> +          items:
> +            - const: pme
> +            - const: aer
> +            - const: intr
> +
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            - fsl,ls1028a-pcie
> +            - fsl,ls1046a-pcie
> +            - fsl,ls1043a-pcie
> +            - fsl,ls1012a-pcie
> +    then:
> +      properties:
> +        interrupts:
> +          maxItems: 2
> +        interrupt-names:
> +          items:
> +            - const: pme
> +            - const: aer
> +
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            - fsl,ls2080a-pcie
> +            - fsl,ls2085a-pcie
> +            - fsl,ls2088a-pcie
> +            - fsl,ls1021a-pcie
> +    then:
> +      properties:
> +        interrupts:
> +          maxItems: 1
> +        interrupt-names:
> +          items:
> +            - const: intr
> +
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            - fsl,ls1088a-pcie
> +    then:
> +      properties:
> +        interrupts:
> +          maxItems: 1
> +        interrupt-names:
> +          items:
> +            - const: aer
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    soc {
> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +
> +      pcie@3400000 {
> +        compatible = "fsl,ls1088a-pcie";
> +        reg = <0x00 0x03400000 0x0 0x00100000>, /* controller registers */
> +            <0x20 0x00000000 0x0 0x00002000>; /* configuration space */
> +        reg-names = "regs", "config";
> +        interrupts = <0 108 IRQ_TYPE_LEVEL_HIGH>; /* aer interrupt */
> +        interrupt-names = "aer";
> +        #address-cells = <3>;
> +        #size-cells = <2>;
> +        dma-coherent;
> +        device_type = "pci";
> +        bus-range = <0x0 0xff>;
> +        ranges = <0x81000000 0x0 0x00000000 0x20 0x00010000 0x0 0x00010000   /* downstream I/O */
> +                 0x82000000 0x0 0x40000000 0x20 0x40000000 0x0 0x40000000>; /* non-prefetchable memory */
> +        msi-parent = <&its>;
> +        #interrupt-cells = <1>;
> +        interrupt-map-mask = <0 0 0 7>;
> +        interrupt-map = <0000 0 0 1 &gic 0 0 0 109 IRQ_TYPE_LEVEL_HIGH>,
> +                        <0000 0 0 2 &gic 0 0 0 110 IRQ_TYPE_LEVEL_HIGH>,
> +                        <0000 0 0 3 &gic 0 0 0 111 IRQ_TYPE_LEVEL_HIGH>,
> +                        <0000 0 0 4 &gic 0 0 0 112 IRQ_TYPE_LEVEL_HIGH>;
> +        iommu-map = <0 &smmu 0 1>; /* Fixed-up by bootloader */
> +      };
> +    };
> +...
> diff --git a/Documentation/devicetree/bindings/pci/layerscape-pci.txt b/Documentation/devicetree/bindings/pci/layerscape-pci.txt
> deleted file mode 100644
> index ee8a4791a78b4..0000000000000
> --- a/Documentation/devicetree/bindings/pci/layerscape-pci.txt
> +++ /dev/null
> @@ -1,79 +0,0 @@
> -Freescale Layerscape PCIe controller
> -
> -This PCIe host controller is based on the Synopsys DesignWare PCIe IP
> -and thus inherits all the common properties defined in snps,dw-pcie.yaml.
> -
> -This controller derives its clocks from the Reset Configuration Word (RCW)
> -which is used to describe the PLL settings at the time of chip-reset.
> -
> -Also as per the available Reference Manuals, there is no specific 'version'
> -register available in the Freescale PCIe controller register set,
> -which can allow determining the underlying DesignWare PCIe controller version
> -information.
> -
> -Required properties:
> -- compatible: should contain the platform identifier such as:
> -  RC mode:
> -        "fsl,ls1021a-pcie"
> -        "fsl,ls2080a-pcie", "fsl,ls2085a-pcie"
> -        "fsl,ls2088a-pcie"
> -        "fsl,ls1088a-pcie"
> -        "fsl,ls1046a-pcie"
> -        "fsl,ls1043a-pcie"
> -        "fsl,ls1012a-pcie"
> -        "fsl,ls1028a-pcie"
> -  EP mode:
> -	"fsl,ls1028a-pcie-ep", "fsl,ls-pcie-ep"
> -	"fsl,ls1046a-pcie-ep", "fsl,ls-pcie-ep"
> -	"fsl,ls1088a-pcie-ep", "fsl,ls-pcie-ep"
> -	"fsl,ls2088a-pcie-ep", "fsl,ls-pcie-ep"
> -	"fsl,lx2160ar2-pcie-ep", "fsl,ls-pcie-ep"
> -- reg: base addresses and lengths of the PCIe controller register blocks.
> -- interrupts: A list of interrupt outputs of the controller. Must contain an
> -  entry for each entry in the interrupt-names property.
> -- interrupt-names: It could include the following entries:
> -  "aer": Used for interrupt line which reports AER events when
> -	 non MSI/MSI-X/INTx mode is used
> -  "pme": Used for interrupt line which reports PME events when
> -	 non MSI/MSI-X/INTx mode is used
> -  "intr": Used for SoCs(like ls2080a, lx2160a, ls2080a, ls2088a, ls1088a)
> -	  which has a single interrupt line for miscellaneous controller
> -	  events(could include AER and PME events).
> -- fsl,pcie-scfg: Must include two entries.
> -  The first entry must be a link to the SCFG device node
> -  The second entry is the physical PCIe controller index starting from '0'.
> -  This is used to get SCFG PEXN registers
> -- dma-coherent: Indicates that the hardware IP block can ensure the coherency
> -  of the data transferred from/to the IP block. This can avoid the software
> -  cache flush/invalid actions, and improve the performance significantly.
> -
> -Optional properties:
> -- big-endian: If the PEX_LUT and PF register block is in big-endian, specify
> -  this property.
> -
> -Example:
> -
> -        pcie@3400000 {
> -                compatible = "fsl,ls1088a-pcie";
> -                reg = <0x00 0x03400000 0x0 0x00100000>, /* controller registers */
> -                      <0x20 0x00000000 0x0 0x00002000>; /* configuration space */
> -                reg-names = "regs", "config";
> -                interrupts = <0 108 IRQ_TYPE_LEVEL_HIGH>; /* aer interrupt */
> -                interrupt-names = "aer";
> -                #address-cells = <3>;
> -                #size-cells = <2>;
> -                device_type = "pci";
> -                dma-coherent;
> -                num-viewport = <256>;
> -                bus-range = <0x0 0xff>;
> -                ranges = <0x81000000 0x0 0x00000000 0x20 0x00010000 0x0 0x00010000   /* downstream I/O */
> -                          0x82000000 0x0 0x40000000 0x20 0x40000000 0x0 0x40000000>; /* non-prefetchable memory */
> -                msi-parent = <&its>;
> -                #interrupt-cells = <1>;
> -                interrupt-map-mask = <0 0 0 7>;
> -                interrupt-map = <0000 0 0 1 &gic 0 0 0 109 IRQ_TYPE_LEVEL_HIGH>,
> -                                <0000 0 0 2 &gic 0 0 0 110 IRQ_TYPE_LEVEL_HIGH>,
> -                                <0000 0 0 3 &gic 0 0 0 111 IRQ_TYPE_LEVEL_HIGH>,
> -                                <0000 0 0 4 &gic 0 0 0 112 IRQ_TYPE_LEVEL_HIGH>;
> -                iommu-map = <0 &smmu 0 1>; /* Fixed-up by bootloader */
> -        };
> -- 
> 2.34.1
>