linux-kernel - Re: [PATCH v4 4/6] dt-bindings: PCI: Add SiFive FU740 PCIe host controller

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Date:   Thu, 1 Apr 2021 11:54:12 -0500
From:   Rob Herring <robh@...nel.org>
To:     Greentime Hu <greentime.hu@...ive.com>
Cc:     paul.walmsley@...ive.com, hes@...ive.com, erik.danie@...ive.com,
        zong.li@...ive.com, bhelgaas@...gle.com, aou@...s.berkeley.edu,
        mturquette@...libre.com, sboyd@...nel.org,
        lorenzo.pieralisi@....com, p.zabel@...gutronix.de,
        alex.dewar90@...il.com, khilman@...libre.com,
        hayashi.kunihiko@...ionext.com, vidyas@...dia.com,
        jh80.chung@...sung.com, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        helgaas@...nel.org
Subject: Re: [PATCH v4 4/6] dt-bindings: PCI: Add SiFive FU740 PCIe host
 controller

On Thu, Apr 01, 2021 at 02:00:52PM +0800, Greentime Hu wrote:
> Add PCIe host controller DT bindings of SiFive FU740.
> 
> Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
> ---
>  .../bindings/pci/sifive,fu740-pcie.yaml       | 109 ++++++++++++++++++
>  1 file changed, 109 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml b/Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml
> new file mode 100644
> index 000000000000..ccb58e5f06d4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml
> @@ -0,0 +1,109 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/sifive,fu740-pcie.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: SiFive FU740 PCIe host controller
> +
> +description: |+
> +  SiFive FU740 PCIe host controller is based on the Synopsys DesignWare
> +  PCI core. It shares common features with the PCIe DesignWare core and
> +  inherits common properties defined in
> +  Documentation/devicetree/bindings/pci/designware-pcie.txt.
> +
> +maintainers:
> +  - Paul Walmsley <paul.walmsley@...ive.com>
> +  - Greentime Hu <greentime.hu@...ive.com>
> +
> +allOf:
> +  - $ref: /schemas/pci/pci-bus.yaml#
> +
> +properties:
> +  compatible:
> +    const: sifive,fu740-pcie
> +
> +  reg:
> +    maxItems: 3
> +
> +  reg-names:
> +    items:
> +      - const: dbi
> +      - const: config
> +      - const: mgmt
> +
> +  num-lanes:
> +    const: 8
> +
> +  msi-parent: true
> +
> +  interrupt-names:
> +    items:
> +      - const: msi
> +      - const: inta
> +      - const: intb
> +      - const: intc
> +      - const: intd
> +
> +  resets:
> +    description: A phandle to the PCIe power up reset line.

How many (maxItems)?

> +
> +  pwren-gpios:
> +    description: Should specify the GPIO for controlling the PCI bus device power on.
> +    maxItems: 1

Still need to list 'reset-gpios' here.

> +
> +required:
> +  - dma-coherent
> +  - num-lanes
> +  - interrupts
> +  - interrupt-names
> +  - interrupt-parent
> +  - interrupt-map-mask
> +  - interrupt-map
> +  - clock-names
> +  - clocks
> +  - resets
> +  - pwren-gpios
> +  - reset-gpios
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    bus {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +        #include <dt-bindings/clock/sifive-fu740-prci.h>
> +
> +        pcie@...000000 {
> +            compatible = "sifive,fu740-pcie";
> +            #address-cells = <3>;
> +            #size-cells = <2>;
> +            #interrupt-cells = <1>;
> +            reg = <0xe 0x00000000 0x0 0x80000000>,
> +                  <0xd 0xf0000000 0x0 0x10000000>,
> +                  <0x0 0x100d0000 0x0 0x1000>;
> +            reg-names = "dbi", "config", "mgmt";
> +            device_type = "pci";
> +            dma-coherent;
> +            bus-range = <0x0 0xff>;
> +            ranges = <0x81000000  0x0 0x60080000  0x0 0x60080000 0x0 0x10000>,      /* I/O */
> +                     <0x82000000  0x0 0x60090000  0x0 0x60090000 0x0 0xff70000>,    /* mem */
> +                     <0x82000000  0x0 0x70000000  0x0 0x70000000 0x0 0x1000000>,    /* mem */
> +                     <0xc3000000 0x20 0x00000000 0x20 0x00000000 0x20 0x00000000>;  /* mem prefetchable */
> +            num-lanes = <0x8>;
> +            interrupts = <56>, <57>, <58>, <59>, <60>, <61>, <62>, <63>, <64>;
> +            interrupt-names = "msi", "inta", "intb", "intc", "intd";
> +            interrupt-parent = <&plic0>;
> +            interrupt-map-mask = <0x0 0x0 0x0 0x7>;
> +            interrupt-map = <0x0 0x0 0x0 0x1 &plic0 57>,
> +                            <0x0 0x0 0x0 0x2 &plic0 58>,
> +                            <0x0 0x0 0x0 0x3 &plic0 59>,
> +                            <0x0 0x0 0x0 0x4 &plic0 60>;
> +            clock-names = "pcie_aux";
> +            clocks = <&prci PRCI_CLK_PCIE_AUX>;
> +            resets = <&prci 4>;
> +            pwren-gpios = <&gpio 5 0>;
> +            reset-gpios = <&gpio 8 0>;
> +        };
> +    };
> -- 
> 2.30.2
>