Fixes/Addition to use the USB Ethernet gadget with the DWC3 gadget controller

This series implements 2 fixes to be able to use USB Ethernet gadget with the dwc3 driver.
It also adds new commands to bind/unbind a device to/from a driver and update the 'dm tree' command to make it easier to use those new commands. The bind/unbind commands can be used to bind the DWC3 USB gadget to the usb_ether driver from the command line instead of relying on platform code.

Changes in v4:
- Fixed compiler warning: "cmd/bind.c:236:5: warning: ‘ret’ may be used uninitialized in this function [-Wmaybe-uninitialized]"

Changes in v3:
- update commit log
- fixed problem with the function name
- update commit log
- new commit
- new
- factorize code based on comments from ML
- remove the devices before unbinding them
- use device_find_global_by_ofnode() to get a device by its node.

Changes in v2:
- Make the bind/unbind command generic, not specific to usb device.
- Update the API to be able to bind/unbind based on DTS node path
- Add a Kconfig option to select the bind/unbind commands

Jean-Jacques Hiblot (7):
usb: gadget: Add bcdDevice for the DWC3 USB Gadget Controller
net: eth-uclass: Fix for DM USB ethernet support
uclass: Add dev_get_uclass_index() to get the uclass/index of a
device dm: print the index of the device when dumping the dm tree
dm: convert device_get_global_by_of_offset() to
device_get_global_by_ofnode()
device: expose the functions used to remove and unbind children of a
device
cmd: Add bind/unbind commands to bind a device to a driver from the
command line

 arch/arm/mach-rockchip/rk3188-board-spl.c |   2 +-
 arch/arm/mach-rockchip/rk3288-board-spl.c |   2 +-
 arch/sandbox/dts/test.dts                 |  11 ++
 cmd/Kconfig                               |   9 ++
 cmd/Makefile                              |   1 +
 cmd/bind.c                                | 255
++++++++++++++++++++++++++++++
configs/sandbox_defconfig                 |   1 +
drivers/core/device-remove.c              |  30 ++--
drivers/core/device.c                     |  19 ++-
drivers/core/dump.c                       |  16 +-
drivers/core/uclass.c                     |  21 +++
drivers/usb/gadget/gadget_chips.h         |   2 +
include/dm/device-internal.h              |  38 +++++
include/dm/device.h                       |  23 ++-
include/dm/uclass-internal.h              |  11 ++
net/eth-uclass.c                          |   3 +-
test/py/tests/test_bind.py                | 178 +++++++++++++++++++++
17 files changed, 584 insertions(+), 38 deletions(-) create mode

100644 cmd/bind.c create mode 100644 test/py/tests/test_bind.py