Add support for the USB PHY and DWC2 IP which is used by Canaan K230,
and made relevant changes to the DTS.

This series is based on the initial 100ask K230 DshanPi series [1] which
is based on the clock and pinctrl series. Check the details in the link.

Link: https://lore.kernel.org/all/20260115060801.16819-1-jiayu.riscv@isrc.iscas.ac.cn/ [1]

Changes in v2:
- Fold the child into the parent in dtsi.
- Define one usbphy with phy-cells=1.
- Delete the clock of the usbphy as it is not needed.
- Link to v1: https://lore.kernel.org/all/20251230023725.15966-1-jiayu.riscv@isrc.iscas.ac.cn/

Jiayu Du (4):
  dt-bindings: phy: Add Canaan K230 USB PHY
  dt-bindings: usb: dwc2: Add support for Canaan K230 SoC
  phy: usb: Add driver for Canaan K230 USB 2.0 PHY
  riscv: dts: canaan: Add syscon and USB nodes for K230

 .../bindings/phy/canaan,k230-usb-phy.yaml     |  35 +++
 .../devicetree/bindings/usb/dwc2.yaml         |   3 +
 .../boot/dts/canaan/k230-canmv-dshanpi.dts    |  17 ++
 arch/riscv/boot/dts/canaan/k230.dtsi          |  35 +++
 drivers/phy/Kconfig                           |   1 +
 drivers/phy/Makefile                          |   1 +
 drivers/phy/canaan/Kconfig                    |  14 +
 drivers/phy/canaan/Makefile                   |   2 +
 drivers/phy/canaan/phy-k230-usb.c             | 271 ++++++++++++++++++
 9 files changed, 379 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/canaan,k230-usb-phy.yaml
 create mode 100644 drivers/phy/canaan/Kconfig
 create mode 100644 drivers/phy/canaan/Makefile
 create mode 100644 drivers/phy/canaan/phy-k230-usb.c

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2.52.0