[PATCH v16 0/6] usb: dwc3: introduce Rockchip glue driver

The recent Rockchip platform have a combined PHY, which does USB3 and
DisplayPort as well as muxing the lines in arbitrary order. Changing
its enabled functionality requires a PHY reset and as the PHY provides
a clock to the DWC3 controller, this can result in an SError. Apart
from that the PHY might not start up correctly when the DWC3 PIPE
interface is running. This series prepares a Rockchip specific DWC3
glue driver to help out with these problems. To become useful more
patches are needed on the Rockchip USBDP PHY side, which are send
separately.

This was split from the USBDP cleanup series. It has no dependencies,
but is required for part 3 for the USBDP cleanup series (which will
be the final part).

Changes in v16:
- Link to v15 (sorry, I missed force setting the revision for this
  part in the series split, so the series says v1 in the patch subject):
  https://patch.msgid.link/20260915-b4-rockchip-dwc3-rockchip-glue-v1-0-763bb546824e@collabora.com
- Update first patch to also build the PM functions even when
  PM is disabled
- Add new patch for defining an empty usb_udc_vbus_handler stub
  when USB_GADGET is disabled
- Add dependency to Rockchip DWC3 glue, which disallows the
  configuration with USB_DWC3_ROCKCHIP=y and USB_GADGET=m
- Collect tags

Changes in v15:
 - Link to v14: https://patch.msgid.link/20260813-rockchip-usbdp-cleanup-v14-0-b5ad9c68fa11@collabora.com
 - Avoid #ifdef for CONFIG_PM in the new glue driver (Thinh Nguyen)
 - Do not add #if IS_ENABLED around the DT compatible blacklist in the
   generic driver, using the glue driver should be mandatory as the
   generic driver results in arbitrary system hangs. Thinh Nguyen suggested
   updating Kconfig for this, but did not clarify what that means.
   Current Kconfig works the same way as the other mandatory glue
   drivers.
 - Split series to simplify review

Signed-off-by: Sebastian Reichel <redacted>
---
Sebastian Reichel (6):
      phy: core: add notifier infrastructure
      usb: dwc3: rockchip: introduce glue driver
      usb: dwc3: core: add post PHY registration hook for platform glue
      usb: dwc3: rockchip: support PHY reset notifications
      usb: gadget: define stub for usb_udc_vbus_handler
      usb: dwc3: rockchip: fix USB-C reconnect in gadget mode

 drivers/phy/phy-core.c           |  65 ++++++++++
 drivers/usb/dwc3/Kconfig         |  12 ++
 drivers/usb/dwc3/Makefile        |   1 +
 drivers/usb/dwc3/core.c          |  17 ++-
 drivers/usb/dwc3/core.h          |   9 ++
 drivers/usb/dwc3/dwc3-rockchip.c | 254 +++++++++++++++++++++++++++++++++++++++
 drivers/usb/dwc3/trace.c         |   3 +
 include/linux/phy/phy.h          |  40 ++++++
 include/linux/usb/gadget.h       |   5 +
 9 files changed, 405 insertions(+), 1 deletion(-)
---
base-commit: e5e04726cdd043e309677071ab1b65a4b18f422b
change-id: 20260914-b4-rockchip-dwc3-rockchip-glue-979ea3735d43

Best regards,
--  
Sebastian Reichel [off-list ref]