linux-kernel - Re: [PATCH v1 2/7] dt-bindings: usb: hpe,gxp-udc: Add binding for gxp gadget

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Message-ID: <b85230d4-8fce-ba49-0d6b-8c4d20132cda@linaro.org>
Date:   Thu, 3 Nov 2022 12:29:49 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     richard.yu@....com, verdun@....com, nick.hawkins@....com,
        gregkh@...uxfoundation.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux@...linux.org.uk,
        balbi@...nel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 2/7] dt-bindings: usb: hpe,gxp-udc: Add binding for gxp
 gadget

On 03/11/2022 12:06, richard.yu@....com wrote:
> From: Richard Yu <richard.yu@....com>
> 

Subject: Drop redundant second "binding" word.

> Create documentation for the hpe,gxp-udc binding to support access to
> the virtual USB device.
> 
> Signed-off-by: Richard Yu <richard.yu@....com>
> ---
>  .../devicetree/bindings/usb/hpe,gxp-udc.yaml  | 57 +++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/hpe,gxp-udc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/hpe,gxp-udc.yaml b/Documentation/devicetree/bindings/usb/hpe,gxp-udc.yaml
> new file mode 100644
> index 000000000000..f1ec4df8c3d3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/hpe,gxp-udc.yaml
> @@ -0,0 +1,57 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/hpe,gxp-udc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: HPE GXP Gadget Universal Device Controller (UDC)
> +
> +maintainers:
> +  - Richard Yu <richard.yu@....com>
> +  - Jean-Marie Verdun <verdun@....com>
> +  - Nick Hawkins <nick.hawkins@....com>
> +
> +properties:
> +  compatible:
> +    const: hpe,gxp-udc
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  vdevnum:
> +    description:
> +      virtual device number.

That's unusual property... Why numbering devices is part of DT (hardware
description)?

> +
> +  fepnum:
> +    description:
> +      number of the flexible end-points this device is needed.

Similar question.

BTW, if you end sentence with '.', it means it is an sentence, so you
need to start it with capital letter.

> +
> +  hpe,syscon-phandle:

phandle is redudant. You need rather specific name, so "hpe,ehci-syscon"
or whatever it is.


> +    $ref: '/schemas/types.yaml#/definitions/phandle'


No quotes.

> +    description:
> +      Phandle to the gxp vEHCI controller access vDevice registers.

Drop "Phandle to"

Isn't "gxp" a GXP?

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - vdevnum
> +  - fepnum
> +  - hpe,syscon-phandle
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    udc@...01000 {

Node name "usb", I think it is more popular for USB controllers.

> +      compatible = "hpe,gxp-udc";
> +      reg = <0x80401000 0x1000>;
> +      interrupts = <13>;
> +      interrupt-parent = <&vic1>;
> +      vdevnum = <0>;
> +      fepnum = <7>;
> +      hpe,syscon-phandle = <&udc_system_controller>;
> +    };

Best regards,
Krzysztof