dtoc: Split source-code scanning to a separate file

Before expanding the scanning features any more, move this into a separate
file. This will make it easier to maintain in the future. In particular,
it reduces the size of dtb_platdata.py and allows us to add tests
specifically for scanning, without going through that file.

The pieces moved are the Driver class, the scanning code and the various
naming functions, since they mostly depend on the scanning results.

So far there is are no separate tests for src_scan. These will be added
as new functionality appears.

This introduces no functional change.

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

tools/dtoc/test_dtoc.py

@@ -18,13 +18,14 @@ import tempfile
 import unittest
 from unittest import mock
 
-from dtb_platdata import conv_name_to_c
-from dtb_platdata import get_compat_name
 from dtb_platdata import get_value
 from dtb_platdata import tab_to
 from dtoc import dtb_platdata
 from dtoc import fdt
 from dtoc import fdt_util
+from dtoc import src_scan
+from dtoc.src_scan import conv_name_to_c
+from dtoc.src_scan import get_compat_name
 from patman import test_util
 from patman import tools
 
@@ -933,9 +934,9 @@ U_BOOT_DRVINFO(spl_test2) = {
 
     def test_driver(self):
         """Test the Driver class"""
-        drv1 = dtb_platdata.Driver('fred')
-        drv2 = dtb_platdata.Driver('mary')
-        drv3 = dtb_platdata.Driver('fred')
+        drv1 = src_scan.Driver('fred')
+        drv2 = src_scan.Driver('mary')
+        drv3 = src_scan.Driver('fred')
         self.assertEqual("Driver(name='fred')", str(drv1))
         self.assertEqual(drv1, drv3)
         self.assertNotEqual(drv1, drv2)
@@ -989,8 +990,7 @@ U_BOOT_DRVINFO(spl_test2) = {
 
             # Mock out scan_driver and check that it is called with the
             # expected files
-            with mock.patch.object(dtb_platdata.DtbPlatdata, "scan_driver") \
-                    as mocked:
+            with mock.patch.object(src_scan.Scanner, "scan_driver")  as mocked:
                 dtb_platdata.run_steps(['all'], dtb_file, False, None, [outdir],
                                        True, basedir=indir)
             self.assertEqual(2, len(mocked.mock_calls))