linux-kernel - Re: [PATCH v3 1/3] dt-bindings: usb: Add binding for WCH CH334/CH335 hub controller

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Message-ID: <20260112-lively-hallowed-beetle-fc15b2@quoll>
Date: Mon, 12 Jan 2026 09:50:37 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Chaoyi Chen <kernel@...kyi.com>
Cc: Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Heiko Stuebner <heiko@...ech.de>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Quentin Schulz <quentin.schulz@...rry.de>, Jonas Karlman <jonas@...boo.se>, 
	Chaoyi Chen <chaoyi.chen@...k-chips.com>, Hsun Lai <i@...insx.cn>, John Clark <inindev@...il.com>, 
	Jimmy Hon <honyuenkwun@...il.com>, Dragan Simic <dsimic@...jaro.org>, 
	Michael Riesch <michael.riesch@...labora.com>, Peter Robinson <pbrobinson@...il.com>, 
	Alexey Charkov <alchark@...il.com>, Shawn Lin <shawn.lin@...k-chips.com>, 
	Sebastian Reichel <sebastian.reichel@...labora.com>, Andy Yan <andy.yan@...k-chips.com>, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-usb@...r.kernel.org
Subject: Re: [PATCH v3 1/3] dt-bindings: usb: Add binding for WCH CH334/CH335
 hub controller

On Mon, Jan 12, 2026 at 10:28:21AM +0800, Chaoyi Chen wrote:
> From: Chaoyi Chen <chaoyi.chen@...k-chips.com>
> 
> The WCH CH334/CH335[0] are USB2.0 protocol compliant 4-port USB HUB
> controller chips, supporting USB2.0 high-speed and full-speed for
> upstream ports, and USB2.0 high-speed 480Mbps, full-speed 12Mbps and
> low-speed 1.5Mbps for downstream ports, supporting not only low-cost STT
> mode (single TT schedules 4 downstream ports in time share), but also
> supports high performance MTT mode (4 TTs each corresponding to 1 port,
> concurrent processing).
> 
> Add a device tree binding for it.
> 
> [0]: https://www.wch-ic.com/downloads/CH334DS1_PDF.html
> 
> Signed-off-by: Chaoyi Chen <chaoyi.chen@...k-chips.com>
> ---
>  .../devicetree/bindings/usb/wch,ch334.yaml    | 65 +++++++++++++++++++

This must be separate patch. Do not combine independent subsystems into
one patchset.

>  1 file changed, 65 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/wch,ch334.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/wch,ch334.yaml b/Documentation/devicetree/bindings/usb/wch,ch334.yaml
> new file mode 100644
> index 000000000000..2eeb92f25b4c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/wch,ch334.yaml
> @@ -0,0 +1,65 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/wch,ch334.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: WCH CH334/CH335 USB 2.0 Hub Controller
> +
> +maintainers:
> +  - Chaoyi Chen <kernel@...kyi.com>
> +
> +allOf:
> +  - $ref: usb-hub.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - usb1a86,8091
> +
> +  reg: true
> +
> +  reset-gpios:
> +    description: GPIO controlling the RESET# pin.
> +
> +  vdd-supply:
> +    description:
> +      The regulator that provides 3.3V core power to the hub.
> +
> +  vdd2-supply:
> +    description:
> +      The regulator that provides 3.3V or 5V power to the hub.
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    patternProperties:
> +      '^port@':
> +        $ref: /schemas/graph.yaml#/properties/port
> +
> +        properties:
> +          reg:
> +            minimum: 1
> +            maximum: 4
> +
> +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 = "usb1a86,8091";
> +            reg = <1>;
> +            reset-gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>;

Are you sure?

Best regards,
Krzysztof