linux-kernel - Re: [PATCH 2/6] dt-bindings: usb: Add binding for Genesys Logic GL850G hub controller

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Date:   Mon, 28 Nov 2022 09:47:23 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Icenowy Zheng <uwu@...nowy.me>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Andre Przywara <andre.przywara@....com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/6] dt-bindings: usb: Add binding for Genesys Logic
 GL850G hub controller

On 27/11/2022 08:31, Icenowy Zheng wrote:
> The Genesys Logic GL850G is a USB 2.0 Single TT hub controller that
> features 4 downstream ports, an internal 5V-to-3.3V LDO regulator (can
> be bypassed) and an external reset pin.

Subject: drop second, redundant "binding for".

Few nits below.

> 
> Add a device tree binding for its USB protocol part. The internal LDO is
> not covered by this and can just be modelled as a fixed regulator.
> 
> Signed-off-by: Icenowy Zheng <uwu@...nowy.me>
> ---
>  .../bindings/usb/genesys,gl850g.yaml          | 48 +++++++++++++++++++
>  1 file changed, 48 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/genesys,gl850g.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/genesys,gl850g.yaml b/Documentation/devicetree/bindings/usb/genesys,gl850g.yaml
> new file mode 100644
> index 000000000000..d1fe539db399
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/genesys,gl850g.yaml
> @@ -0,0 +1,48 @@
> +# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/realtek,rts5411.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Genesys Logic GL850G USB 2.0 hub controller
> +
> +maintainers:
> +  - Icenowy Zheng <uwu@...nowy.me>
> +
> +allOf:
> +  - $ref: usb-device.yaml#
> +
> +properties:
> +  compatible:
> +    items:

Drop items, you have only one item.

> +      - enum:
> +          - usb5e3,608
> +
> +  reg: true
> +
> +  reset-gpios:
> +    description: GPIO specifier for GRST# pin.

Drop "GPIO specifier for", so just "GRST# pin". No need to describe
DeviceTree syntax.

> +
> +  vdd-supply:
> +    description:
> +      phandle to the regulator that provides power to the hub.

Also drop "phandle to"

> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    usb {
> +        dr_mode = "host";
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        hub: hub@1 {
> +            compatible = "usb5e3,608";
> +            reg = <1>;
> +            reset-gpios = <&pio 7 2 GPIO_ACTIVE_LOW>;

Missing header.

Does not look like you tested the bindings. Please run `make
dt_binding_check` (see
Documentation/devicetree/bindings/writing-schema.rst for instructions).

> +        };
> +    };

Best regards,
Krzysztof