dtoc: Support processing the root node

The device for the root node is normally bound by driver model on init.
With devices being instantiated at build time, we must handle the root
device also.

Add support for processing the root node, which may not have a compatible
string.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 21 insertions, 2 deletions

diff --git a/tools/dtoc/test_dtoc.py b/tools/dtoc/test_dtoc.py
index b077cf0e76..ed8c7e4788 100755
--- a/tools/dtoc/test_dtoc.py
+++ b/tools/dtoc/test_dtoc.py
@@ -974,10 +974,10 @@ U_BOOT_DRVINFO(spl_test2) = {
         output = tools.GetOutputFilename('output')
 
         # Take a copy before messing with it
-        scan = copy.deepcopy(saved_scan)
+        scan = copy_scan()
         plat = dtb_platdata.DtbPlatdata(scan, dtb_file, False)
         plat.scan_dtb()
-        plat.scan_tree()
+        plat.scan_tree(False)
         plat.prepare_nodes()
         return plat, scan
 
@@ -1123,3 +1123,22 @@ U_BOOT_DRVINFO(spl_test2) = {
         self.assertEqual(4, i2c.seq)
         spl = plat._fdt.GetNode('/spl-test')
         self.assertEqual(0, spl.seq)
+
+    def test_process_root(self):
+        """Test assignment of sequence numnbers"""
+        dtb_file = get_dtb_file('dtoc_test_simple.dts')
+        output = tools.GetOutputFilename('output')
+
+        # Take a copy before messing with it
+        scan = copy_scan()
+        plat = dtb_platdata.DtbPlatdata(scan, dtb_file, False)
+        plat.scan_dtb()
+        root = plat._fdt.GetRoot()
+
+        plat.scan_tree(False)
+        self.assertNotIn(root, plat._valid_nodes)
+
+        plat.scan_tree(True)
+        self.assertIn(root, plat._valid_nodes)
+        self.assertEqual('root_driver',
+                         scan.get_normalized_compat_name(root)[0])