This patchset merged two following patchsets and make usb port a real device.
[PATCH V3 1/4] usb: add struct usb_hub_port to store
[PATCH V3 2/4] usb: move struct usb_device->children
[PATCH V3 3/4] usb/acpi: add the support of usb hub
[PATCH V3 4/4] usb/acpi: add usb check for the connection
[PATCH 1/3] xhci: Add clear PORT_POWER feature process in the
[PATCH 2/3] USB/ACPI: Add usb port's acpi power control in the xhci
[PATCH 3/3] usb : Add sysfs files to control usb port's power

This patchset is to provide usb port power off mechanism. Add two
attributes "portX/control" and "portX/state" for each ports
under the usb hub interface sysfs directory.

"portX/control" has two options
"on" - port power must be on.
"off" - port power must be off.

"portX/state" reports usb port's power state
"on" - power on
"off" - power off
"error" - can't get power state

[PATCH V6 1/9] usb: convert port_owners type from void * to struct
[PATCH V6 2/9] usb: make usb port a real device
[PATCH V6 3/9] usb: move children to struct usb_port
[PATCH V6 4/9] usb/acpi : rebinding usb with acpi since usb port
[PATCH V6 5/9] usb/acpi: add check for the connect type of usb port
[PATCH V6 6/9] xhci: Add clear PORT_POWER feature process in the
[PATCH V6 7/9] USB/ACPI: Add usb port's acpi power control in the
[PATCH V6 8/9] usb: return error when fail to get usb device
[PATCH V6 9/9] usb : Add usb port's power control attributes

git diff --stat HEAD~9
 Documentation/ABI/testing/sysfs-bus-usb |   25 ++++++++++++
 drivers/staging/usbip/usbip_common.c    |    3 +-
 drivers/usb/core/config.c               |    4 +-
 drivers/usb/core/devices.c              |    7 ++--
 drivers/usb/core/hub.c                  |  357 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------------------
 drivers/usb/core/usb-acpi.c             |  205 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------
 drivers/usb/core/usb.h                  |   25 ++++++++++--
 drivers/usb/host/r8a66597-hcd.c         |    5 +--
 drivers/usb/host/xhci-hub.c             |   16 ++++++++
 include/linux/usb.h                     |   32 ++++++++++++++-
 10 files changed, 569 insertions(+), 110 deletions(-)