Add a specific usb gadget binding test which check that
binding a driver without compatible string is working as expected.

the command "bind /usb@1 usb_ether" should give the following "dm tree"
command output:

[...]
 usb           0  [   ]   usb_sandbox           |-- usb@1
 usb_hub       0  [   ]   usb_hub               |   |-- hub
 usb_emul      0  [   ]   usb_sandbox_hub       |   |   `-- hub-emul
 usb_emul      1  [   ]   usb_sandbox_flash     |   |       |-- flash-stick@0
 usb_emul      2  [   ]   usb_sandbox_flash     |   |       |-- flash-stick@1
 usb_emul      3  [   ]   usb_sandbox_flash     |   |       |-- flash-stick@2
 usb_emul      4  [   ]   usb_sandbox_keyb      |   |       `-- keyb@3
 eth           4  [   ]   usb_ether             |   `-- usb@1
[...]

Signed-off-by: Patrice Chotard <patrice.chot...@foss.st.com>
Cc: Marek Vasut <ma...@denx.de>
Cc: Herbert Poetzl <herb...@13thfloor.at>

---

Changes in v2:
  - add bind test

 test/py/tests/test_bind.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/test/py/tests/test_bind.py b/test/py/tests/test_bind.py
index 6703325c0b..56edd78863 100644
--- a/test/py/tests/test_bind.py
+++ b/test/py/tests/test_bind.py
@@ -33,6 +33,13 @@ def test_bind_unbind_with_node(u_boot_console):
        assert in_tree(tree, 'bind-test-child1', 'phy', 'phy_sandbox', 1, False)
        assert in_tree(tree, 'bind-test-child2', 'simple_bus', 'simple_bus', 1, 
True)
 
+       #bind usb_ether driver (which has no compatible) to usb@1 node.
+       ##New entry usb_ether should appear in the dm tree
+       response = u_boot_console.run_command('bind  /usb@1 usb_ether')
+       assert response == ''
+       tree = u_boot_console.run_command('dm tree')
+       assert in_tree(tree, 'usb@1', 'eth', 'usb_ether', 1, True)
+
        #Unbind child #1. No error expected and all devices should be there 
except for bind-test-child1
        response = u_boot_console.run_command('unbind  
/bind-test/bind-test-child1')
        assert response == ''
-- 
2.17.1

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