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>

cmd/dm.c

@@ -48,11 +48,29 @@ static int do_dm_dump_drivers(struct cmd_tbl *cmdtp, int flag, int argc,
 	return 0;
 }
 
+static int do_dm_dump_driver_compat(struct cmd_tbl *cmdtp, int flag, int argc,
+				    char * const argv[])
+{
+	dm_dump_driver_compat();
+
+	return 0;
+}
+
+static int do_dm_dump_static_driver_info(struct cmd_tbl *cmdtp, int flag, int argc,
+					 char * const argv[])
+{
+	dm_dump_static_driver_info();
+
+	return 0;
+}
+
 static struct cmd_tbl test_commands[] = {
 	U_BOOT_CMD_MKENT(tree, 0, 1, do_dm_dump_all, "", ""),
 	U_BOOT_CMD_MKENT(uclass, 1, 1, do_dm_dump_uclass, "", ""),
 	U_BOOT_CMD_MKENT(devres, 1, 1, do_dm_dump_devres, "", ""),
 	U_BOOT_CMD_MKENT(drivers, 1, 1, do_dm_dump_drivers, "", ""),
+	U_BOOT_CMD_MKENT(compat, 1, 1, do_dm_dump_driver_compat, "", ""),
+	U_BOOT_CMD_MKENT(static, 1, 1, do_dm_dump_static_driver_info, "", ""),
 };
 
 static __maybe_unused void dm_reloc(void)
@@ -94,5 +112,7 @@ U_BOOT_CMD(
 	"tree          Dump driver model tree ('*' = activated)\n"
 	"dm uclass        Dump list of instances for each uclass\n"
 	"dm devres        Dump list of device resources for each device\n"
-	"dm drivers       Dump list of drivers and their compatible strings"
+	"dm drivers       Dump list of drivers with uclass and instances\n"
+	"dm compat        Dump list of drivers with compatibility strings\n"
+	"dm static        Dump list of drivers with static platform data"
 );

drivers/core/dump.c

@@ -97,7 +97,7 @@ void dm_dump_uclass(void)
 	}
 }
 
-void dm_dump_drivers(void)
+void dm_dump_driver_compat(void)
 {
 	struct driver *d = ll_entry_start(struct driver, driver);
 	const int n_ents = ll_entry_count(struct driver, driver);
@@ -120,3 +120,56 @@ void dm_dump_drivers(void)
 			printf("%-20.20s  %s\n", "", match->compatible);
 	}
 }
+
+void dm_dump_drivers(void)
+{
+	struct driver *d = ll_entry_start(struct driver, driver);
+	const int n_ents = ll_entry_count(struct driver, driver);
+	struct driver *entry;
+	struct udevice *udev;
+	struct uclass *uc;
+	int i;
+
+	puts("Driver                    uid uclass               Devices\n");
+	puts("----------------------------------------------------------\n");
+
+	for (entry = d; entry < d + n_ents; entry++) {
+		uclass_get(entry->id, &uc);
+
+		printf("%-25.25s %-3.3d %-20.20s ", entry->name, entry->id,
+		       uc ? uc->uc_drv->name : "<no uclass>");
+
+		if (!uc) {
+			puts("\n");
+			continue;
+		}
+
+		i = 0;
+		uclass_foreach_dev(udev, uc) {
+			if (udev->driver != entry)
+				continue;
+			if (i)
+				printf("%-51.51s", "");
+
+			printf("%-25.25s\n", udev->name);
+			i++;
+		}
+		if (!i)
+			puts("<none>\n");
+	}
+}
+
+void dm_dump_static_driver_info(void)
+{
+	struct driver_info *drv = ll_entry_start(struct driver_info,
+						 driver_info);
+	const int n_ents = ll_entry_count(struct driver_info, driver_info);
+	struct driver_info *entry;
+
+	puts("Driver                    Address\n");
+	puts("---------------------------------\n");
+	for (entry = drv; entry != drv + n_ents; entry++) {
+		printf("%-25.25s @%08lx\n", entry->name,
+		       (ulong)map_to_sysmem(entry->platdata));
+	}
+}

include/dm/util.h

@@ -42,4 +42,10 @@ static inline void dm_dump_devres(void)
 /* Dump out a list of drivers */
 void dm_dump_drivers(void);
 
+/* Dump out a list with each driver's compatibility strings */
+void dm_dump_driver_compat(void);
+
+/* Dump out a list of drivers with static platform data */
+void dm_dump_static_driver_info(void);
+
 #endif

test/py/tests/test_dm.py

@@ -4,14 +4,32 @@
 import pytest
 
 @pytest.mark.buildconfigspec('cmd_dm')
-def test_dm_drivers(u_boot_console):
+def test_dm_compat(u_boot_console):
-    """Test that each driver in `dm tree` is also listed in `dm drivers`."""
+    """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