cmd: Add command to dump drivers and compatible strings

This adds a subcommand to dm to dump out what drivers are installed, and their
compatible strings. I have found this useful in ensuring that I have the correct
drivers compiled, and that I have put in the correct compatible strings.

Signed-off-by Sean Anderson <seanga2@gmail.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

cmd/dm.c

@@ -40,10 +40,19 @@ static int do_dm_dump_devres(cmd_tbl_t *cmdtp, int flag, int argc,
 	return 0;
 }
 
+static int do_dm_dump_drivers(cmd_tbl_t *cmdtp, int flag, int argc,
+			       char * const argv[])
+{
+	dm_dump_drivers();
+
+	return 0;
+}
+
 static cmd_tbl_t 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, "", ""),
 };
 
 static __maybe_unused void dm_reloc(void)
@@ -84,5 +93,6 @@ U_BOOT_CMD(
 	"Driver model low level access",
 	"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"
+	"dm devres        Dump list of device resources for each device\n"
+	"dm drivers       Dump list of drivers and their compatible strings\n"
 );

drivers/core/dump.c

@@ -96,3 +96,22 @@ void dm_dump_uclass(void)
 		puts("\n");
 	}
 }
+
+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;
+	const struct udevice_id *match;
+
+	puts("Driver                Compatible\n");
+	puts("--------------------------------\n");
+	for (entry = d; entry < d + n_ents; entry++) {
+		for (match = entry->of_match; match->compatible; match++)
+			printf("%-20.20s  %s\n",
+			       match == entry->of_match ? entry->name : "",
+			       match->compatible);
+		if (match == entry->of_match)
+			printf("%-20.20s\n", entry->name);
+	}
+}

include/dm/util.h

@@ -39,6 +39,9 @@ static inline void dm_dump_devres(void)
 }
 #endif
 
+/* Dump out a list of drivers */
+void dm_dump_drivers(void);
+
 /**
  * Check if an of node should be or was bound before relocation.
  *