Re: [PATCH 07/18] dt-bindings: usb: Convert xHCI bindings to DT schema

[Rob Herring]

On Sun, Oct 11, 2020 at 01:41:10AM +0300, Serge Semin wrote:
> Currently the DT bindings of Generic xHCI Controllers are described by means
> of the legacy text file. Since such format is deprecated in favor of the
> DT schema, let's convert the Generic xHCI Controllers bindings file to the
> corresponding yaml files. There will be two of them: a DT schema for the
> xHCI controllers on a generic platform and a DT schema validating a generic
> xHCI controllers properties. The later will be used to validate the xHCI
> controllers, which aside from some vendor-specific features support the
> basic xHCI functionality.
> 
> An xHCI-compatible DT node shall support the standard USB HCD properties
> and custom ones like: usb2-lpm-disable, usb3-lpm-capable,
> quirk-broken-port-ped and imod-interval-ns. In addition if a generic xHCI
> controller is being validated against the DT schema it is also supposed to
> be equipped with mandatory compatible string, single registers range,
> single interrupts source, and is supposed to optionally contain up to two
> reference clocks for the controller core and CSRs.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx>
> ---
>  .../devicetree/bindings/usb/generic-xhci.yaml | 63 +++++++++++++++++++
>  .../devicetree/bindings/usb/usb-xhci.txt      | 41 ------------
>  .../devicetree/bindings/usb/usb-xhci.yaml     | 40 ++++++++++++
>  3 files changed, 103 insertions(+), 41 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/usb/generic-xhci.yaml
>  delete mode 100644 Documentation/devicetree/bindings/usb/usb-xhci.txt
>  create mode 100644 Documentation/devicetree/bindings/usb/usb-xhci.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/generic-xhci.yaml b/Documentation/devicetree/bindings/usb/generic-xhci.yaml
> new file mode 100644
> index 000000000000..1ea1d49a8175
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/generic-xhci.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/generic-xhci.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: USB xHCI Controller Device Tree Bindings
> +
> +maintainers:
> +  - Mathias Nyman <mathias.nyman@xxxxxxxxx>
> +
> +allOf:
> +  - $ref: "usb-xhci.yaml#"
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - description: Generic xHCI device
> +        const: generic-xhci
> +      - description: Armada 37xx/375/38x/8k SoCs
> +        items:
> +          - enum:
> +              - marvell,armada3700-xhci
> +              - marvell,armada-375-xhci
> +              - marvell,armada-380-xhci
> +              - marvell,armada-8k-xhci
> +          - const: generic-xhci
> +      - description: Broadcom STB SoCs with xHCI
> +        const: brcm,bcm7445-xhci
> +      - description: Generic xHCI device
> +        const: xhci-platform
> +        deprecated: true
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 2
> +
> +  clock-names:
> +    minItems: 1
> +    items:
> +      - const: core
> +      - const: reg
> +
> +unevaluatedProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +examples:
> +  - |
> +    usb@f0931000 {
> +      compatible = "generic-xhci";
> +      reg = <0xf0931000 0x8c8>;
> +      interrupts = <0x0 0x4e 0x0>;
> +    };
> diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt
> deleted file mode 100644
> index 0c5cff84a969..000000000000
> --- a/Documentation/devicetree/bindings/usb/usb-xhci.txt
> +++ /dev/null
> @@ -1,41 +0,0 @@
> -USB xHCI controllers
> -
> -Required properties:
> -  - compatible: should be one or more of
> -
> -    - "generic-xhci" for generic XHCI device
> -    - "marvell,armada3700-xhci" for Armada 37xx SoCs
> -    - "marvell,armada-375-xhci" for Armada 375 SoCs
> -    - "marvell,armada-380-xhci" for Armada 38x SoCs
> -    - "brcm,bcm7445-xhci" for Broadcom STB SoCs with XHCI
> -    - "xhci-platform" (deprecated)
> -
> -    When compatible with the generic version, nodes must list the
> -    SoC-specific version corresponding to the platform first
> -    followed by the generic version.
> -
> -  - reg: should contain address and length of the standard XHCI
> -    register set for the device.
> -  - interrupts: one XHCI interrupt should be described here.
> -
> -Optional properties:
> -  - clocks: reference to the clocks
> -  - clock-names: mandatory if there is a second clock, in this case
> -    the name must be "core" for the first clock and "reg" for the
> -    second one
> -  - usb2-lpm-disable: indicate if we don't want to enable USB2 HW LPM
> -  - usb3-lpm-capable: determines if platform is USB3 LPM capable
> -  - quirk-broken-port-ped: set if the controller has broken port disable mechanism
> -  - imod-interval-ns: default interrupt moderation interval is 5000ns
> -  - phys : see usb-hcd.yaml in the current directory
> -
> -additionally the properties from usb-hcd.yaml (in the current directory) are
> -supported.
> -
> -
> -Example:
> -	usb@f0931000 {
> -		compatible = "generic-xhci";
> -		reg = <0xf0931000 0x8c8>;
> -		interrupts = <0x0 0x4e 0x0>;
> -	};
> diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.yaml b/Documentation/devicetree/bindings/usb/usb-xhci.yaml
> new file mode 100644
> index 000000000000..c5c177f2e055
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/usb-xhci.yaml
> @@ -0,0 +1,40 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/usb-xhci.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Generic USB xHCI Controller Device Tree Bindings
> +
> +maintainers:
> +  - Mathias Nyman <mathias.nyman@xxxxxxxxx>
> +
> +allOf:
> +  - $ref: "usb-hcd.yaml#"
> +
> +properties:
> +  usb2-lpm-disable:
> +    description: Indicates if we don't want to enable USB2 HW LPM
> +    type: boolean
> +
> +  usb3-lpm-capable:
> +    description: Determines if platform is USB3 LPM capable
> +    type: boolean
> +
> +  quirk-broken-port-ped:
> +    description: Set if the controller has broken port disable mechanism
> +    type: boolean
> +
> +  imod-interval-ns:
> +    description: Interrupt moderation interval
> +    default: 5000

Having additionalProperties or unevaluatedProperties is going to be 
mandatory, so for this add:

additionalProperties: true

> +
> +examples:
> +  - |
> +    usb@f0930000 {
> +      compatible = "generic-xhci";
> +      reg = <0xf0930000 0x8c8>;
> +      interrupts = <0x0 0x4e 0x0>;
> +      usb2-lpm-disable;
> +      usb3-lpm-capable;
> +    };
> -- 
> 2.27.0
>