[PATCH v2 0/4] Add USB2.0 PHY and USB3.0 PHY support for SpacemiT K1

[Ze Huang]

This patch series introduces support for the USB2.0 PHY and PCIe/USB3.0
Combo PHY on the SpacemiT K1 SoC. The implementation has been tested on the
Milk-V Jupiter and BananaPi-f3.

K1 includes three USB ports as follows[1]:
- A USB2.0 OTG Port
- A USB2.0 Host Only Port
- A USB3.0 Port with a USB2.0 DRD interface

USB3.0 PHY for USB3.0 Port is shared with PCIe port A, meaning that only one of
these interfaces (PCIe or USB3.0) can be active at a given time.

Link: https://developer.spacemit.com/documentation?token=AjHDwrW78igAAEkiHracBI9HnTb#part5 [1]

Signed-off-by: Ze Huang <huangze at whut.edu.cn>
---
Changes in v2:
- combphy dt-bindings:
  - fix reg-names
  - describe reg
  - describe #phy-cells argument
- drop stale ".owner" in driver struct
- add support for usb lfps_thres in combphy
- fix Kconfig depends on
- Link to v1: https://lore.kernel.org/all/20250407-b4-k1-usb3-v3-2-v1-0-bf0bcc41c9ba@whut.edu.cn

---
Ze Huang (4):
      dt-bindings: phy: spacemit: add K1 USB2 PHY
      dt-bindings: phy: spacemit: add K1 PCIe/USB3 combo PHY
      phy: spacemit: support K1 USB2.0 PHY controller
      phy: spacemit: add USB3 support for K1 PCIe/USB3 combo PHY

 .../bindings/phy/spacemit,k1-combphy.yaml          |  72 ++++++
 .../devicetree/bindings/phy/spacemit,usb2-phy.yaml |  40 ++++
 drivers/phy/Kconfig                                |   1 +
 drivers/phy/Makefile                               |   1 +
 drivers/phy/spacemit/Kconfig                       |  21 ++
 drivers/phy/spacemit/Makefile                      |   3 +
 drivers/phy/spacemit/phy-k1-combphy.c              | 251 +++++++++++++++++++++
 drivers/phy/spacemit/phy-k1-usb2.c                 | 131 +++++++++++
 8 files changed, 520 insertions(+)
---
base-commit: 64e9fdfc89a76fed38d8ddeed72d42ec71957ed9
change-id: 20250417-b4-k1-usb3-phy-v2-fb1e41849049
prerequisite-message-id: <20250416135406.16284-1-heylenay at 4d2.org>
prerequisite-patch-id: 19b7f061557b184b9565e10ccfc0aab5754dfa73
prerequisite-patch-id: a56183c8b71a141ca6f5d401b67a5456f40d4a9c
prerequisite-patch-id: a4a3c44d4c3e44f5209bff2b2bd0b49cd5a9eebe
prerequisite-patch-id: 471fe02daa5297e85e9cee8dfef873375a348e9f
prerequisite-patch-id: 717bc3d50f0924f7697312cb78280b15a029ce2c
prerequisite-patch-id: 585a2a9ce37a5e2a036f7351ff8ff4ed859bbe3e
prerequisite-message-id: <20250414191715.2264758-1-elder at riscstar.com>
prerequisite-patch-id: a7769b6451bfd80d5e5366013753c5fc870b2255
prerequisite-patch-id: 8a8d0eefd0b4423d87f3c093b451a0fa60622ec4
prerequisite-patch-id: 30f92f93e5b3577bde61424303f21c709a715ec5
prerequisite-patch-id: d774b8281b5c6a822445365ee94925e1ab6c7a93
prerequisite-patch-id: 54a4f5d065eb9f212fd99efec6e7e06abbb9bad8
prerequisite-patch-id: db30b8a180a5f04f499d851384d4a7f95ccb00b3
prerequisite-patch-id: 5f53f8bf16fb067628092daebc4831293261aa01

Best regards,
-- 
Ze Huang <huangze at whut.edu.cn>