linux-kernel - Re: [PATCH 1/2] dt-bindings: usb: misc: Add microchip USB5807 HUB driver

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Date:   Tue, 9 May 2023 10:02:56 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Mike Looijmans <mike.looijmans@...ic.nl>,
        devicetree@...r.kernel.org, linux-usb@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: usb: misc: Add microchip USB5807 HUB
 driver

On 09/05/2023 09:46, Mike Looijmans wrote:
> The USB5807 is a 7-port USB 3.1 hub that can be configured by I2C.
> This driver resets the chip, optionally allows D+/D- lines to be
> swapped in the devicetree config, and then sends an ATTACH command to
> put the device in operational mode.
> 
> Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>
> 

Subject: drop misc prefix.
Subject: drop "driver", you are not adding driver here.

> ---
> 
>  .../devicetree/bindings/usb/usb5807.yaml      | 51 +++++++++++++++++++
>  1 file changed, 51 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/usb5807.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/usb5807.yaml b/Documentation/devicetree/bindings/usb/usb5807.yaml
> new file mode 100644
> index 000000000000..06b94210c281
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/usb5807.yaml

Filename like compatible.

> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/usb5807.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip USB 3.1 SuperSpeed Hub Controller
> +
> +maintainers:
> +  - Mike Looijmans <mike.looijmans@...ic.nl>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - microchip,usb5807
> +
> +  reg:
> +    maxItems: 1
> +
> +  reset-gpios:
> +    description: |
> +      Should specify the gpio for hub reset

Drop description, obvious. maxItems instead. If you decide to add
description, then keep it useful, e.g. mention active low.


> +
> +  swap-dx-lanes:
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    description: |

Do not need '|' unless you need to preserve formatting.

> +      Specifies the ports which will swap the differential-pair (D+/D-),
> +      default is not-swapped.

maxItems (and minItems if it differs)

No supply? How does the hub gets power? I see at least two supplies in
datasheet.

> +
> +additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg

Best regards,
Krzysztof