linux-kernel - Re: [PATCH v4 1/5] dt-bindings: PCI: add snps,dw-pcie.yaml

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Date:   Thu, 15 Jul 2021 11:23:37 -0600
From:   Rob Herring <robh@...nel.org>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Jingoo Han <jingoohan1@...il.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v4 1/5] dt-bindings: PCI: add snps,dw-pcie.yaml

On Tue, Jul 13, 2021 at 01:17:51PM +0200, Mauro Carvalho Chehab wrote:
> Currently, the designware schema is defined on a text file:
> 	designware-pcie.txt
> 
> Convert the pci-bus part into a schema.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> ---
>  .../devicetree/bindings/pci/snps,dw-pcie.yaml | 96 +++++++++++++++++++
>  MAINTAINERS                                   |  1 +
>  2 files changed, 97 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
> new file mode 100644
> index 000000000000..fd372d715ab4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
> @@ -0,0 +1,96 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pci/snps,dw-pcie.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Synopsys DesignWare PCIe interface
> +
> +maintainers:
> +  - Jingoo Han <jingoohan1@...il.com>
> +  - Gustavo Pimentel <gustavo.pimentel@...opsys.com>
> +
> +description: |
> +  Synopsys DesignWare PCIe host controller
> +
> +allOf:
> +  - $ref: /schemas/pci/pci-bus.yaml#
> +
> +properties:
> +  compatible:
> +    anyOf:
> +      - {}
> +      - const: snps,dw-pcie
> +
> +  reg:
> +    description: |
> +      It should contain Data Bus Interface (dbi) and config registers for all
> +      versions.
> +      For designware core version >= 4.80, it may contain ATU address space.
> +    minItems: 2
> +    maxItems: 4
> +
> +  reg-names:
> +    minItems: 2
> +    maxItems: 4
> +    items:
> +      enum: [dbi, dbi2, config, atu, addr_space, app, elbi, mgmt]

Isn't 'config' only for host and 'addr_space' only for endpoint?

> +
> +  num-lanes:
> +    $ref: '/schemas/types.yaml#/definitions/uint32'
> +    description: |
> +      number of lanes to use (this property should be specified unless
> +      the link is brought already up in BIOS)
> +    maximum: 16
> +
> +  reset-gpio:
> +    description: GPIO pin number of PERST# signal
> +    maxItems: 1
> +    deprecated: true
> +
> +  reset-gpios:
> +    description: GPIO controlled connection to PERST# signal
> +    maxItems: 1
> +
> +  snps,enable-cdm-check:
> +    type: boolean
> +    description: |
> +      This is a boolean property and if present enables
> +      automatic checking of CDM (Configuration Dependent Module) registers
> +      for data corruption. CDM registers include standard PCIe configuration
> +      space registers, Port Logic registers, DMA and iATU (internal Address
> +      Translation Unit) registers.
> +
> +  num-viewport:
> +    description: |
> +      number of view ports configured in hardware. If a platform
> +      does not specify it, the driver autodetects it.
> +    deprecated: true
> +
> +unevaluatedProperties: false
> +
> +required:
> +  - reg
> +  - reg-names
> +  - compatible
> +
> +examples:
> +  - |
> +    bus {
> +      #address-cells = <1>;
> +      #size-cells = <1>;
> +      pcie@...00000 {
> +        device_type = "pci";
> +        compatible = "snps,dw-pcie";
> +        reg = <0xdfc00000 0x0001000>, /* IP registers */
> +              <0xd0000000 0x0002000>; /* Configuration space */
> +        reg-names = "dbi", "config";
> +        #address-cells = <3>;
> +        #size-cells = <2>;
> +        ranges = <0x81000000 0 0x00000000 0xde000000 0 0x00010000>,
> +                 <0x82000000 0 0xd0400000 0xd0400000 0 0x0d000000>;
> +        interrupts = <25>, <24>;

Not documented.

> +        #interrupt-cells = <1>;

Not documented.

> +        num-lanes = <1>;
> +      };
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4529cf5ed430..f0115c590731 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14283,6 +14283,7 @@ M:	Gustavo Pimentel <gustavo.pimentel@...opsys.com>
>  L:	linux-pci@...r.kernel.org
>  S:	Maintained
>  F:	Documentation/devicetree/bindings/pci/designware-pcie.txt
> +F:	Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
>  F:	drivers/pci/controller/dwc/*designware*
>  
>  PCI DRIVER FOR TI DRA7XX/J721E
> -- 
> 2.31.1
> 
>