phy: ti: tusb1210: Add charger detection

Some Android x86 tablets with a Bay Trail (BYT) SoC and a Crystal Cove
PMIC, which does not support charger-detection, rely on a TUSB1211
phy for charger-detection.

Add support for charger detection on TUSB1211 phy-s and export
the information about the detected charger through the standard
power_supply class interface. power_supply class charger IC drivers
like the bq24190_charger.c driver will then pick this up and set
their input_current_limit based on this.

Note the "linux,phy_charger_detect" property used to enable this is
a special kernel-internal (so not part of the dt-bindings) property
used by dwc3 platform code to indicate that the phy needs to do
charger-detection.

Changes by Hans de Goede:
- Use "linux,phy_charger_detect" property to enable charger-detect
- Switch from a linear flow to a state-machine, with retries on
  ulpi communication errors
- Use SW_CONTROL bit to disable the FSM when detection is finished
- Do a phy-reset on disconnect to work around the phy often refusing
  ulpi_read()/_write() commands after a disconnect
- Use power_supply_reg_notifier() for Vbus monitoring
- Export the detection result through a power_supply class device

Signed-off-by: Stephan Gerhold <[email protected]>
Co-developed-by: Hans de Goede <[email protected]>
Signed-off-by: Hans de Goede <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

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