Add USB PHY support for CV18XX/SG200X series

Changed from v3:
1. patch 1: remove vbus-gpio, switch-gpio and dr_mode properties.
2. patch 2: remove all logic related to the bindings change.
3. remove the syscon header file.

Changed from v2:
1. add item description for switch gpios.

Changed from v1:
1. remove dr_mode property and use default mode instead.
2. improve the description of `vbus_det-gpios` and `sophgo,switch-gpios`

Inochi Amaoto (2):
  dt-bindings: phy: Add Sophgo CV1800 USB phy
  phy: sophgo: Add USB 2.0 PHY driver for Sophgo CV18XX/SG200X

 .../bindings/phy/sophgo,cv1800b-usb2-phy.yaml |  54 +++++
 drivers/phy/Kconfig                           |   1 +
 drivers/phy/Makefile                          |   1 +
 drivers/phy/sophgo/Kconfig                    |  19 ++
 drivers/phy/sophgo/Makefile                   |   2 +
 drivers/phy/sophgo/phy-cv1800-usb2.c          | 222 ++++++++++++++++++
 6 files changed, 299 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/sophgo,cv1800b-usb2-phy.yaml
 create mode 100644 drivers/phy/sophgo/Kconfig
 create mode 100644 drivers/phy/sophgo/Makefile
 create mode 100644 drivers/phy/sophgo/phy-cv1800-usb2.c

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2.49.0