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header.from=cherry.de; Received: from GVXPR04MB12038.eurprd04.prod.outlook.com (2603:10a6:150:2be::5) by DU2PR04MB8664.eurprd04.prod.outlook.com (2603:10a6:10:2df::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9499.7; Mon, 12 Jan 2026 14:01:13 +0000 Received: from GVXPR04MB12038.eurprd04.prod.outlook.com ([fe80::1033:5a9a:dc18:dad]) by GVXPR04MB12038.eurprd04.prod.outlook.com ([fe80::1033:5a9a:dc18:dad%4]) with mapi id 15.20.9499.005; Mon, 12 Jan 2026 14:01:13 +0000 Message-ID: <07ce7c4e-7fc7-40f8-9c46-4977e3ce2458@cherry.de> Date: Mon, 12 Jan 2026 15:00:48 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/3] dt-bindings: usb: Add binding for WCH CH334/CH335 hub controller To: Chaoyi Chen , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Heiko Stuebner , Greg Kroah-Hartman , Jonas Karlman , Chaoyi Chen , Hsun Lai , John Clark , Jimmy Hon , Dragan Simic , Michael Riesch , Peter Robinson , Alexey Charkov , Shawn Lin , Sebastian Reichel , Andy Yan Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org References: <20260112022823.91-1-kernel@airkyi.com> <20260112022823.91-2-kernel@airkyi.com> Content-Language: en-US From: Quentin Schulz In-Reply-To: <20260112022823.91-2-kernel@airkyi.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: FR3P281CA0209.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:a5::8) To GVXPR04MB12038.eurprd04.prod.outlook.com (2603:10a6:150:2be::5) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: GVXPR04MB12038:EE_|DU2PR04MB8664:EE_ X-MS-Office365-Filtering-Correlation-Id: 236af86e-a9f5-41f1-ca08-08de51e30bdb X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: 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X-MS-Exchange-CrossTenant-AuthSource: GVXPR04MB12038.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Jan 2026 14:01:13.2389 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 5e0e1b52-21b5-4e7b-83bb-514ec460677e X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: O7SQyAHgicw1K/HhjSSYx7Jh0uZ9GrCojFMJvCJaswl9C1PpLSQV0rTigRjYjB9ZFv9fUrUUwm0jGTfAWmGNfu7QitWL2v1zcpZOvv19w8k= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU2PR04MB8664 Hi Chaoyi, On 1/12/26 3:28 AM, Chaoyi Chen wrote: > From: Chaoyi Chen > > 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 > --- > .../devicetree/bindings/usb/wch,ch334.yaml | 65 +++++++++++++++++++ > 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 > + > +allOf: > + - $ref: usb-hub.yaml# > + > +properties: > + compatible: > + enum: > + - usb1a86,8091 > + Which driver does this node bind to? I couldn't quickly find a driver which would match this compatible? > + 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. > + There's v5 and vdd33 as power input, shouldn't we maybe use those names instead? How did you come up with vdd/vdd2? There's also a timing that needs to be respected after a power-on event so that the reset has enough time to be performed, c.f. 3.2.1 Power-on Reset in the datasheet you linked to in the commit log. How are you making sure we wait those (apparently, the wording in the datasheet is confusing) 14ms? Cheers, Quentin