linux-kernel - [PATCH v3 0/3] Add SpacemiT K1 USB3.0 host controller support

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Message-Id: <20250518-b4-k1-dwc3-v3-v3-0-7609c8baa2a6@whut.edu.cn>
Date: Sun, 18 May 2025 03:19:18 +0800
From: Ze Huang <huangze@...t.edu.cn>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Yixun Lan <dlan@...too.org>, 
 Thinh Nguyen <Thinh.Nguyen@...opsys.com>, 
 Philipp Zabel <p.zabel@...gutronix.de>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>
Cc: linux-usb@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-riscv@...ts.infradead.org, spacemit@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, Ze Huang <huangze@...t.edu.cn>
Subject: [PATCH v3 0/3] Add SpacemiT K1 USB3.0 host controller support

The USB 3.0 controller found in the SpacemiT K1 SoC[1] supports both USB3.0
Host and USB2.0 Dual-Role Device (DRD). The PHY interfaces required for the
K1 USB subsystem — PIPE3 (for USB 3.0) and UTMI+ (for USB 2.0) — have
already been supported in a separate patchset [2].

This controller is compatible with DesignWare Core USB 3 (DWC3) driver.
However, constraints in the snps,dwc3 binding limit the ability to extend
properties to describe hardware variations. The existing generic DWC3 driver,
dwc3-of-simple, still functions as a glue layer.

To address this and promote trasition to flattened dwc node, this patch
introduces dwc3-common, building upon prior work that exposed the DWC3 core
driver [3].

This patchset is based on usb-next (6.15-rc6) and has been tested on BananaPi and Jupiter development boards.

Link: https://developer.spacemit.com/documentation?token=AjHDwrW78igAAEkiHracBI9HnTb [1]
Link: https://lore.kernel.org/linux-riscv/20250418-b4-k1-usb3-phy-v2-v2-0-b69e02da84eb@whut.edu.cn [2]
Link: https://lore.kernel.org/all/20250414-dwc3-refactor-v7-3-f015b358722d@oss.qualcomm.com [3]

Signed-off-by: Ze Huang <huangze@...t.edu.cn>
---
Changes in v3:
- introduce dwc3-common for generic dwc3 hardware
- fix warnings in usb host dt-bindings
- fix errors in dts
- Link to v2: https://lore.kernel.org/r/20250428-b4-k1-dwc3-v2-v1-0-7cb061abd619@whut.edu.cn

Changes in v2:
- dt-bindings:
  - add missing 'maxItems'
  - remove 'status' property in exmaple
  - fold dwc3 node into parent
- drop dwc3 glue driver and use snps,dwc3 driver directly
- rename dts nodes and reorder properties to fit coding style
- Link to v1: https://lore.kernel.org/all/20250407-b4-k1-usb3-v3-2-v1-0-bf0bcc41c9ba@whut.edu.cn

---
Ze Huang (3):
      dt-bindings: usb: dwc3: add support for SpacemiT K1
      usb: dwc3: add common driver to support flattened DT
      riscv: dts: spacemit: add usb3.0 support for K1

 .../devicetree/bindings/usb/spacemit,k1-dwc3.yaml  |  84 +++++++++
 arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts    |  50 ++++++
 arch/riscv/boot/dts/spacemit/k1.dtsi               |  69 ++++++++
 drivers/usb/dwc3/Kconfig                           |   9 +
 drivers/usb/dwc3/Makefile                          |   1 +
 drivers/usb/dwc3/dwc3-common.c                     | 191 +++++++++++++++++++++
 6 files changed, 404 insertions(+)
---
base-commit: ab6dc9a6c721c2eed867c157447764ae68ff9b7e
change-id: 20250517-b4-k1-dwc3-v3-5208a002728a

Best regards,
-- 
Ze Huang <huangze@...t.edu.cn>