Refactor so that register writes for configuration are only performed if
the device has a i2c_client provided and also register as a platform
driver. This allows the driver to be used to manage GPIO based control
of the device.

Since v1:
 - make the modern pm macros usage a separate patch
 - use pm_sleep_ptr instead of pm_ptr for usb251xb_plat_pm_ops, because
   this ops is for PM_SLEEP only.

Jisheng Zhang (3):
  dt-bindings: usb: usb251xb: make reg optional for no I2C ctrl use case
  usb: usb251xb: use modern PM macros
  usb: usb251xb: support usage case without I2C control

 .../devicetree/bindings/usb/usb251xb.yaml     |   1 -
 drivers/usb/misc/usb251xb.c                   | 108 +++++++++++++++---
 2 files changed, 94 insertions(+), 15 deletions(-)

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2.50.0