linux-kernel - Re: [PATCH v2 1/4] dt-bindings: usb: Introduce usb-hub.yaml

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Message-ID: <20250416165232.GA3327258-robh@kernel.org>
Date: Wed, 16 Apr 2025 11:52:32 -0500
From: Rob Herring <robh@...nel.org>
To: Pin-yen Lin <treapking@...omium.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matthias Kaehlcke <mka@...omium.org>,
	Stephen Boyd <swboyd@...omium.org>, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 1/4] dt-bindings: usb: Introduce usb-hub.yaml

On Tue, Apr 15, 2025 at 05:41:58PM +0800, Pin-yen Lin wrote:
> Introduce a general USB hub binding that describes downstream ports
> and hard wired USB devices for on-board USB hubs.
> 
> Signed-off-by: Pin-yen Lin <treapking@...omium.org>
> 
> ---
> 
> Changes in v2:
> - New in v2
> 
>  .../devicetree/bindings/usb/usb-hub.yaml      | 91 +++++++++++++++++++
>  1 file changed, 91 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/usb-hub.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/usb-hub.yaml b/Documentation/devicetree/bindings/usb/usb-hub.yaml
> new file mode 100644
> index 00000000000000..34cd248fa43c2d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/usb-hub.yaml
> @@ -0,0 +1,91 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/usb-hub.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Generic USB Hub
> +
> +maintainers:
> +  - Pin-yen Lin <treapking@...omium.org>
> +
> +allOf:
> +  - $ref: usb-device.yaml#
> +
> +properties:
> +  compatible: true
> +
> +  reg: true

Drop these 2, already covered by usb-device.yaml.

> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0

Drop this, already covered by usb-device.yaml.

> +
> +  peer-hub:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      phandle to the peer hub on the controller.
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +    description:
> +      The downstream facing USB ports
> +
> +    patternProperties:
> +      "^port@[1-9]$":

Only 9 ports possible? Should be '^port@[1-9a-f][0-9a-f]*$'

> +        $ref: /schemas/graph.yaml#/properties/port
> +
> +patternProperties:
> +  '^.*@[1-9]$':
> +    description: The hard wired USB devices
> +    type: object
> +    $ref: /schemas/usb/usb-device.yaml
> +    additionalProperties: true
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: true
> +
> +examples:
> +  - |
> +    usb {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        /* 2.0 hub on port 1 */
> +        hub_2_0: hub@1 {
> +            compatible = "usb123,4567";
> +            reg = <1>;
> +            peer-hub = <&hub_3_0>;
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            /* USB 2.0 device on port 5 */
> +            device@5 {
> +                reg = <5>;
> +                compatible = "usb765,4321";
> +            };
> +        };
> +
> +        /* 3.0 hub on port 2 */
> +        hub_3_0: hub@2 {
> +            compatible = "usb123,abcd";
> +            reg = <2>;
> +            peer-hub = <&hub_2_0>;
> +
> +            ports {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                /* Type-A connector on port 3 */
> +                port@3 {
> +                    reg = <3>;
> +                    endpoint {
> +                        remote-endpoint = <&usb_a0_ss>;
> +                    };
> +                };
> +            };
> +        };
> +    };
> -- 
> 2.49.0.777.g153de2bbd5-goog
>