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

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Message-ID: <90011b58-3c12-45ec-b64f-b3847d9a3e16@kernel.org>
Date: Tue, 13 Jan 2026 08:41:13 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Chaoyi Chen <chaoyi.chen@...k-chips.com>, 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>,
 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 13/01/2026 04:27, Chaoyi Chen wrote:
> Hi Krzysztof,
> 
> On 1/12/2026 10:28 PM, Krzysztof Kozlowski wrote:
>> On 12/01/2026 09:59, Chaoyi Chen wrote:
>>>>> +required:
>>>>> +  - compatible
>>>>> +  - reg
>>>>> +
>>>>> +additionalProperties: false
>>>>> +
>>>>> +examples:
>>>>> +  - |
>>>>> +    #include <dt-bindings/gpio/gpio.h>
>>>>> +    usb {
>>>>> +        dr_mode = "host";
>>
>> One more thing - drop above line.
>>
> 
> Will fix in next version.
> 
>>>>> +        #address-cells = <1>;
>>>>> +        #size-cells = <0>;
>>>>> +
>>>>> +        hub: hub@1 {
>>>>> +            compatible = "usb1a86,8091";
>>>>> +            reg = <1>;
>>>>> +            reset-gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>;
>>>>
>>>> Are you sure?
>>>
>>> I guess what you're concerned about here is the polarity? 
>>> If that's the case, then there's no problem.
>>
>> Yes, I was wondering whether polarity is set correctly.
> 
> Yes, it is active-low, so during normal operation it should be set to high.

Then it is wrong.

> 


Best regards,
Krzysztof