linux-kernel - Re: [PATCH v2 01/14] dt-bindings: PCI: cadence: Add PCIe RC/EP DT schema for Cadence PCIe

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Date:   Tue, 7 Jan 2020 21:43:14 -0600
From:   Rob Herring <robh@...nel.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Murray <andrew.murray@....com>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 01/14] dt-bindings: PCI: cadence: Add PCIe RC/EP DT
 schema for Cadence PCIe

On Mon, Jan 06, 2020 at 03:50:45PM +0530, Kishon Vijay Abraham I wrote:
> Add PCIe Host (RC) and Endpoint (EP) device tree schema for Cadence
> PCIe core library. Platforms using Cadence PCIe core can include the
> schemas added here in the platform specific schemas.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  .../devicetree/bindings/pci/cdns-pcie-ep.yaml | 20 ++++++++++++
>  .../bindings/pci/cdns-pcie-host.yaml          | 30 +++++++++++++++++
>  .../devicetree/bindings/pci/cdns-pcie.yaml    | 32 +++++++++++++++++++
>  3 files changed, 82 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/cdns-pcie-ep.yaml
>  create mode 100644 Documentation/devicetree/bindings/pci/cdns-pcie-host.yaml
>  create mode 100644 Documentation/devicetree/bindings/pci/cdns-pcie.yaml

Need to remove the old files.

Note that I posted a conversion of Cadence host[1]. Yours goes further, 
but please compare and add anything mine has that yours doesn't.

[1] https://lore.kernel.org/linux-pci/20191231193903.15929-2-robh@kernel.org/

> 
> diff --git a/Documentation/devicetree/bindings/pci/cdns-pcie-ep.yaml b/Documentation/devicetree/bindings/pci/cdns-pcie-ep.yaml
> new file mode 100644
> index 000000000000..36aaae5931c3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/cdns-pcie-ep.yaml
> @@ -0,0 +1,20 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
> +%YAML 1.2
> +--
> +$id: "http://devicetree.org/schemas/pci/cdns-pcie-ep.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Cadence PCIe Endpoint
> +
> +maintainers:
> +  - Tom Joseph <tjoseph@...ence.com>
> +
> +allOf:
> +  - $ref: "cdns-pcie.yaml#"
> +
> +properties:
> +  max-functions:
> +    description: Maximum number of functions that can be configured (default 1)
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint8
> diff --git a/Documentation/devicetree/bindings/pci/cdns-pcie-host.yaml b/Documentation/devicetree/bindings/pci/cdns-pcie-host.yaml
> new file mode 100644
> index 000000000000..78261bc4f0c5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/cdns-pcie-host.yaml
> @@ -0,0 +1,30 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/pci/cdns-pcie-host.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Cadence PCIe Host
> +
> +maintainers:
> +  - Tom Joseph <tjoseph@...ence.com>
> +
> +allOf:
> +  - $ref: "/schemas/pci/pci-bus.yaml#"
> +  - $ref: "cdns-pcie.yaml#"
> +
> +properties:
> +  vendor-id:
> +    description: The PCI vendor ID (16 bits, default is design dependent)
> +
> +  device-id:
> +    description: The PCI device ID (16 bits, default is design dependent)

While these got defined here as 16-bits, these should be fixed to 32-bit 
because they are established properties for a long time.

> +
> +  cdns,no-bar-match-nbits:
> +    description: Set into the no BAR match register to configure the number
> +      of least significant bits kept during inbound (PCIe -> AXI) address
> +      translations (default 32)
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32

What about compatible?

> +
> diff --git a/Documentation/devicetree/bindings/pci/cdns-pcie.yaml b/Documentation/devicetree/bindings/pci/cdns-pcie.yaml
> new file mode 100644
> index 000000000000..497d3dc2e6f2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/cdns-pcie.yaml
> @@ -0,0 +1,32 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/pci/cdns-pcie.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Cadence PCIe Core
> +
> +maintainers:
> +  - Tom Joseph <tjoseph@...ence.com>
> +
> +properties:
> +  max-link-speed:
> +    minimum: 1
> +    maximum: 3
> +
> +  num-lanes:
> +    minimum: 1
> +    maximum: 2

Needs a type.

The Cadence IP can't support x4, x8, or x16?

> +
> +  cdns,max-outbound-regions:
> +    description: Set to maximum number of outbound regions.
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  phys:
> +    description: List of Generic PHY phandles. One per lane if more than one in
> +      the list. If only one PHY listed it must manage all lanes.
> +
> +  phy-names:
> +    description: List of names to identify the PHY.
> -- 
> 2.17.1
>