[v3,2/3] cmd: fs: Add command to list supported fs types

diff --git a/cmd/fs.c b/cmd/fs.c
index db74767b7b..26b47bd001 100644
--- a/cmd/fs.c
+++ b/cmd/fs.c
@@ -99,3 +99,14 @@  U_BOOT_CMD(
 	"fstype <interface> <dev>:<part> <varname>\n"
 	"- set environment variable to filesystem type\n"
 );
+
+static int do_fstypes_wrapper(cmd_tbl_t *cmdtp, int flag, int argc,
+			      char * const argv[])
+{
+	return do_fs_types(cmdtp, flag, argc, argv);
+}
+
+U_BOOT_CMD(
+	fstypes, 1, 1, do_fstypes_wrapper,
+	"List supported filesystem types", ""
+);
diff --git a/fs/fs.c b/fs/fs.c
index 0c66d60477..3e38b2e27a 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -900,3 +900,23 @@  int do_ln(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 
 	return 0;
 }
+
+int do_fs_types(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	struct fstype_info *drv = fstypes;
+	const int n_ents = ARRAY_SIZE(fstypes);
+	struct fstype_info *entry;
+	int i = 0;
+
+	puts("Supported filesystems");
+	for (entry = drv; entry != drv + n_ents; entry++) {
+		if (entry->fstype != FS_TYPE_ANY) {
+			printf("%c %s", i ? ',' : ':', entry->name);
+			i++;
+		}
+	}
+	if (!i)
+		puts(": <none>");
+	puts("\n");
+	return CMD_RET_SUCCESS;
+}
diff --git a/include/fs.h b/include/fs.h
index 37e35c2120..514c248e50 100644
--- a/include/fs.h
+++ b/include/fs.h
@@ -254,4 +254,15 @@  int do_fs_uuid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
  */
 int do_fs_type(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
 
+/**
+ * do_fs_types - List supported filesystems.
+ *
+ * @cmdtp: Command information for fstypes
+ * @flag: Command flags (CMD_FLAG_...)
+ * @argc: Number of arguments
+ * @argv: List of arguments
+ * @return result (see enum command_ret_t)
+ */
+int do_fs_types(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
+
 #endif /* _FS_H */
diff --git a/test/py/tests/test_fs/test_fs_cmd.py b/test/py/tests/test_fs/test_fs_cmd.py
new file mode 100644
index 0000000000..86ba92e025
--- /dev/null
+++ b/test/py/tests/test_fs/test_fs_cmd.py
@@ -0,0 +1,12 @@ 
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2020
+# Niel Fourie, DENX Software Engineering, lusus at denx.de
+
+import pytest
+
+ at pytest.mark.buildconfigspec('cmd_fs_generic')
+def test_dm_compat(u_boot_console):
+    """Test that `fstypes` prints a result which includes `sandbox`."""
+    output = u_boot_console.run_command('fstypes')
+    assert "Supported filesystems:" in output
+    assert "sandbox" in output