[PATCH v2 0/6] add USB Type-B GPIO based role switch driver

[Chunfeng Yun]

Because the USB Connector is introduced and the requirement of
usb-connector.txt binding, the old way using extcon to support
USB Dual-Role switch is now deprecated, meanwhile there is no
available common driver when use Type-B connector.
This patch series introduce a Type-B connector driver and try
to replace the function provided by extcon-usb-gpio driver.
The main purpose of the patches is also to solve the Type-B
connector problem encountered in [1].

[1]: https://patchwork.kernel.org/patch/10819377/

v2 changes:
 1. make binding clear, and add a extra compatible suggested by Hans

Chunfeng Yun (6):
  dt-bindings: connector: add optional properties for Type-B
  dt-bindings: usb: add binding for Type-B dual role switch by GPIO
  dt-bindings: usb: mtu3: add properties about USB Role Switch
  usb: roles: add API to get usb_role_switch by node
  usb: roles: add driver of USB Type-B role switch by GPIO
  usb: mtu3: register a USB Role Switch for dual role mode

 .../bindings/connector/usb-connector.txt      |   9 +
 .../devicetree/bindings/usb/mediatek,mtu3.txt |  10 +-
 .../bindings/usb/typeb-switch-gpio.txt        |  26 ++
 drivers/usb/mtu3/mtu3.h                       |   5 +
 drivers/usb/mtu3/mtu3_dr.c                    |  50 ++-
 drivers/usb/mtu3/mtu3_plat.c                  |   3 +-
 drivers/usb/roles/Kconfig                     |  14 +
 drivers/usb/roles/Makefile                    |   1 +
 drivers/usb/roles/class.c                     |  30 ++
 drivers/usb/roles/typeb-switch-gpio.c         | 285 ++++++++++++++++++
 include/linux/usb/role.h                      |   1 +
 11 files changed, 428 insertions(+), 6 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/usb/typeb-switch-gpio.txt
 create mode 100644 drivers/usb/roles/typeb-switch-gpio.c

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2.20.1