binman: Include also subnodes in generator nodes

This allows to prefill fdt and config nodes with hash and signature
subnodes. It's just important to place the child nodes last so that
hashes do not come before the data - would be disliked by mkimage.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

tools/binman/etype/fit.py

@@ -269,6 +269,10 @@ class Entry_fit(Entry_section):
                         # Add data for 'images' nodes (but not 'config')
                         if depth == 1 and in_images:
                             fsw.property('data', tools.read_file(fname))
+
+                        for subnode in node.subnodes:
+                            with fsw.add_node(subnode.name):
+                                _add_node(node, depth + 1, subnode)
             else:
                 if self._fdts is None:
                     if self._fit_list_prop:

tools/binman/ftest.py

@@ -4029,6 +4029,7 @@ class TestFunctional(unittest.TestCase):
             self.assertEqual(expected_data, fnode.props['data'].bytes)
             self.assertEqual('fdt-test-fdt%d.dtb' % seq,
                              fnode.props['description'].value)
+            self.assertEqual(fnode.subnodes[0].name, 'hash')
 
         def _CheckConfig(seq, expected_data):
             """Check the configuration nodes

tools/binman/test/170_fit_fdt.dts

@@ -36,6 +36,9 @@
 					description = "fdt-NAME.dtb";
 					type = "flat_dt";
 					compression = "none";
+					hash {
+						algo = "sha256";
+					};
 				};
 			};