[PATCH v4 0/2] usb: typec: ucsi: Add ITE IT8851/IT8853 support

[Amber Kao]

This series adds Device Tree bindings and minimal UCSI driver support 
for the ITE IT8851/IT8853 USB Type-C Power Delivery controller over I2C.

Changes in v4:
- Use separate tx/rx buffers in itepd_read_reg() for DMA safety
- Rate-limit error prints in the I2C accessors
- Refactor IRQ and poll_cci() into a common itepd_process_event()
  helper serialized by event_lock; poll_cci() now acks events
- Clear cached CCI on PPM_RESET
- Drain pending events in probe instead of a manual interrupt-clear
- Keep ucsi_unregister() before free_irq() in remove(): the IRQ
  handler is the only event consumer/acker on this device, so
  freeing the IRQ first stalls in-flight commands until timeout and
  leaves the PPM with an unacked event. ucsi_unregister() disables
  notifications before freeing connectors, closing the reported UAF
  window in practice. Matches other UCSI I2C drivers.
- Use device-specific compatibles "ite,it8851"/"ite,it8853"
- Move version changelog below the "---" line (Krzysztof)
- Trim MAINTAINERS reviewer list (Krzysztof)

Link to v3: https://lore.kernel.org/all/20260710-ucsi-itepd-feature-v3-0-8523e1e1c47a@xxxxxxxxxx/
Link to v2: https://lore.kernel.org/all/20260710-ucsi-itepd-feature-v2-0-41943fd5df38@xxxxxxxxxx/
Link to v1: https://lore.kernel.org/all/20260615-ucsi-itepd-feature-v1-0-a826cfd0df6a@xxxxxxxxxx/

Signed-off-by: Amber Kao <amber.kao@xxxxxxxxxx>
---
Amber Kao (2):
      dt-bindings: usb: Add ITE IT8851/IT8853 Type-C PD controllers
      usb: typec: ucsi: Add ITE IT8851/IT8853 Type-C PD controller driver

 .../devicetree/bindings/usb/ite,it8851.yaml        | 142 ++++++++
 MAINTAINERS                                        |   9 +
 drivers/usb/typec/ucsi/Kconfig                     |  10 +
 drivers/usb/typec/ucsi/Makefile                    |   1 +
 drivers/usb/typec/ucsi/ucsi_itepd.c                | 381 +++++++++++++++++++++
 5 files changed, 543 insertions(+)
---
base-commit: 8fde5d1d47f69db6082dfa34500c27f8485389a5
change-id: 20260717-ucsi-itepd-4e943e1382f0

Best regards,
--  
Amber Kao <amber.kao@xxxxxxxxxx>