linux-kernel - [PATCH v2 2/2] usb: misc: onboard_dev: Add WCH CH334 USB2.0 Hub (1a86:8091)

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Message-Id: <20260113095827.115-3-kernel@airkyi.com>
Date: Tue, 13 Jan 2026 17:58:27 +0800
From: Chaoyi Chen <kernel@...kyi.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Catalin Popescu <catalin.popescu@...ca-geosystems.com>,
	Stephen Boyd <swboyd@...omium.org>,
	Jens Glathe <jens.glathe@...schoolsolutions.biz>,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
	Mike Looijmans <mike.looijmans@...ic.nl>,
	Pin-yen Lin <treapking@...omium.org>,
	J. Neuschäfer <j.ne@...teo.net>,
	Quentin Schulz <quentin.schulz@...rry.de>
Cc: linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Chaoyi Chen <chaoyi.chen@...k-chips.com>
Subject: [PATCH v2 2/2] usb: misc: onboard_dev: Add WCH CH334 USB2.0 Hub (1a86:8091)

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).

[0]: https://www.wch-ic.com/downloads/CH334DS1_PDF.html

Signed-off-by: Chaoyi Chen <chaoyi.chen@...k-chips.com>
---
 drivers/usb/misc/onboard_usb_dev.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/usb/misc/onboard_usb_dev.h b/drivers/usb/misc/onboard_usb_dev.h
index c1462be5526d..1a1e86e60e04 100644
--- a/drivers/usb/misc/onboard_usb_dev.h
+++ b/drivers/usb/misc/onboard_usb_dev.h
@@ -115,6 +115,13 @@ static const struct onboard_dev_pdata vialab_vl817_data = {
 	.is_hub = true,
 };
 
+static const struct onboard_dev_pdata wch_ch334_data = {
+	.reset_us = 14000,
+	.num_supplies = 2,
+	.supply_names = { "vdd33", "v5" },
+	.is_hub = true,
+};
+
 static const struct onboard_dev_pdata xmos_xvf3500_data = {
 	.reset_us = 1,
 	.num_supplies = 2,
@@ -146,6 +153,7 @@ static const struct of_device_id onboard_dev_match[] = {
 	{ .compatible = "usbbda,5411", .data = &realtek_rts5411_data, },
 	{ .compatible = "usbbda,414", .data = &realtek_rts5411_data, },
 	{ .compatible = "usbbda,5414", .data = &realtek_rts5411_data, },
+	{ .compatible = "usb1a86,8091", .data = &wch_ch334_data, },
 	{ .compatible = "usb1da0,5511", .data = &parade_ps5511_data, },
 	{ .compatible = "usb1da0,55a1", .data = &parade_ps5511_data, },
 	{ .compatible = "usb2109,817", .data = &vialab_vl817_data, },
-- 
2.51.1