linux-kernel - Re: [PATCH v1 08/11] dt-bindings: usb: Add binding for Via lab VL817Q7 hub controller

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Message-ID: <Y7X/xadXIA2f9lHz@google.com>
Date:   Wed, 4 Jan 2023 22:37:57 +0000
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Anand Moon <linux.amoon@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-amlogic@...ts.infradead.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 08/11] dt-bindings: usb: Add binding for Via lab
 VL817Q7 hub controller

On Wed, Dec 28, 2022 at 10:03:17AM +0000, Anand Moon wrote:
> The VIA Lab VL817-Q7 is a USB 3.1 Gen 1 4-Port hub controller that
> features 4 downstream ports, an internal 5V regulator and has
> external reset pin.
> 
> 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: Anand Moon <linux.amoon@...il.com>
> ---
>  .../bindings/usb/vialab,vl817q7.yaml          | 47 +++++++++++++++++++
>  1 file changed, 47 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/vialab,vl817q7.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/vialab,vl817q7.yaml b/Documentation/devicetree/bindings/usb/vialab,vl817q7.yaml
> new file mode 100644
> index 000000000000..4ae995160fd5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/vialab,vl817q7.yaml
> @@ -0,0 +1,47 @@
> +# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
> +%YAML 1.2
> +---
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Via labs VL817Q7 USB 3.1 hub controller

nit: VIA Labs VL817-Q7

> +
> +maintainers:
> +  - Anand Moon <linux.amoon@...il.com>
> +
> +allOf:
> +  - $ref: usb-device.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - vialab,usb2109

This is not a valid compatible string as Johan already noted.

Besides that the VL817-Q7 provides both a 3.1 and a 2.0 USB hub, which
are enumerated separately. Please also add a compatible string for the
2.0 hub (assuming 0x2109 is the 3.1 hub).

> +
> +  reg: true
> +
> +  reset-gpios:
> +    description: GPIO controlling the RESET# pin.
> +
> +  vdd-supply:
> +    description:
> +      the regulator that provides 5.0V core power to the hub.
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    usb {
> +        dr_mode = "host";
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        hub: hub@1 {
> +            compatible = "vialab,usb2109"
> +            reg = <1>;
> +            reset-gpios = <&gpio GPIOH_4 GPIO_ACTIVE_LOW>;
> +        };

Please also add a node for the other hub and link the two nodes with
each other through the 'peer-hub' property. See realtek,rts5411.yaml
for reference.