linux-kernel - Re: [PATCH v6 4/9] dt-bindings: usb: add NXP ChipIdea USB2 Controller schema

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Date: Fri, 23 Feb 2024 07:02:56 -0700
From: Rob Herring <robh@...nel.org>
To: Xu Yang <xu.yang_2@....com>
Cc: gregkh@...uxfoundation.org, krzysztof.kozlowski+dt@...aro.org,
	shawnguo@...nel.org, conor+dt@...nel.org, s.hauer@...gutronix.de,
	kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
	peter.chen@...nel.org, jun.li@....com, linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 4/9] dt-bindings: usb: add NXP ChipIdea USB2
 Controller schema

On Wed, Feb 21, 2024 at 10:58:41PM +0800, Xu Yang wrote:
> As more and more NXP i.MX chips come out, it becomes harder to maintain
> ci-hdrc-usb2.yaml if more stuffs like property restrictions are added to
> this file. This will separate i.MX parts out of ci-hdrc-usb2.yaml and add
> a new schema for NXP ChipIdea USB2 Controller.
> 
> Signed-off-by: Xu Yang <xu.yang_2@....com>
> 
> ---
> Changes in v6:
>  - new patch
> ---
>  .../bindings/usb/ci-hdrc-usb2-imx.yaml        | 75 +++++++++++++++++++
>  1 file changed, 75 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/ci-hdrc-usb2-imx.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2-imx.yaml b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2-imx.yaml
> new file mode 100644
> index 000000000000..2ec62f564bf5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2-imx.yaml
> @@ -0,0 +1,75 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/ci-hdrc-usb2-imx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP USB2 ChipIdea USB controller
> +
> +maintainers:
> +  - Xu Yang <xu.yang_2@....com>
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - enum:
> +          - fsl,imx27-usb
> +      - items:
> +          - enum:
> +              - fsl,imx23-usb
> +              - fsl,imx25-usb
> +              - fsl,imx28-usb
> +              - fsl,imx35-usb
> +              - fsl,imx50-usb
> +              - fsl,imx51-usb
> +              - fsl,imx53-usb
> +              - fsl,imx6q-usb
> +              - fsl,imx6sl-usb
> +              - fsl,imx6sx-usb
> +              - fsl,imx6ul-usb
> +              - fsl,imx7d-usb
> +              - fsl,vf610-usb
> +          - const: fsl,imx27-usb
> +      - items:
> +          - enum:
> +              - fsl,imx8dxl-usb
> +              - fsl,imx8ulp-usb
> +          - const: fsl,imx7ulp-usb
> +          - const: fsl,imx6ul-usb
> +      - items:
> +          - enum:
> +              - fsl,imx8mm-usb
> +              - fsl,imx8mn-usb
> +          - const: fsl,imx7d-usb
> +          - const: fsl,imx27-usb
> +      - items:
> +          - enum:
> +              - fsl,imx6sll-usb
> +              - fsl,imx7ulp-usb
> +          - const: fsl,imx6ul-usb
> +          - const: fsl,imx27-usb

Now you just duplicated all the compatibles, and now any new compatibles 
have to be added in 2 places. For this to work, you have to split 
ci-hdrc-usb2.yaml into 2 files. One with all the common properties and 
one with compatibles (minus imx). This is also needed if imx has any 
extra properties the other don't.

Didn't I say this already?

Rob