cmd: dm: Fixed/Added DM driver listing subcommands

Renamed dm "drivers" subcommand to "compat" (as it listed
compatibility strings) and prevent it from segfaulting when
drivers have no of_match populated.

Added a new "drivers" subcommand to dump a list of all known DM
drivers and for each, their uclass id, uclass driver and names of
attached devices.

Added a new "static" subcommand to dump a list of DM drivers with
statically defined platform data.

Signed-off-by: Niel Fourie <lusus@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/test/py/tests/test_dm.py b/test/py/tests/test_dm.py
index f6fbf8b..97203b5 100644
--- a/test/py/tests/test_dm.py
+++ b/test/py/tests/test_dm.py
@@ -4,14 +4,32 @@
 import pytest
 
 @pytest.mark.buildconfigspec('cmd_dm')
-def test_dm_drivers(u_boot_console):
-    """Test that each driver in `dm tree` is also listed in `dm drivers`."""
+def test_dm_compat(u_boot_console):
+    """Test that each driver in `dm tree` is also listed in `dm compat`."""
     response = u_boot_console.run_command('dm tree')
     driver_index = response.find('Driver')
     assert driver_index != -1
     drivers = (line[driver_index:].split()[0]
                for line in response[:-1].split('\n')[2:])
 
+    response = u_boot_console.run_command('dm compat')
+    for driver in drivers:
+        assert driver in response
+
+@pytest.mark.buildconfigspec('cmd_dm')
+def test_dm_drivers(u_boot_console):
+    """Test that each driver in `dm compat` is also listed in `dm drivers`."""
+    response = u_boot_console.run_command('dm compat')
+    drivers = (line[:20].rstrip() for line in response[:-1].split('\n')[2:])
+    response = u_boot_console.run_command('dm drivers')
+    for driver in drivers:
+        assert driver in response
+
+@pytest.mark.buildconfigspec('cmd_dm')
+def test_dm_static(u_boot_console):
+    """Test that each driver in `dm static` is also listed in `dm drivers`."""
+    response = u_boot_console.run_command('dm static')
+    drivers = (line[:25].rstrip() for line in response[:-1].split('\n')[2:])
     response = u_boot_console.run_command('dm drivers')
     for driver in drivers:
         assert driver in response