binman: Allow unit addresses for binaries

Allow the same binary to appear multiple times in an image by using the
device-tree unit-address feature (u-boot@0, u-boot@1).

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

tools/binman/README

@@ -387,6 +387,10 @@ end-at-4gb:
 Examples of the above options can be found in the tests. See the
 tools/binman/test directory.
 
+It is possible to have the same binary appear multiple times in the image,
+either by using a unit number suffix (u-boot@0, u-boot@1) or by using a
+different name for each and specifying the type with the 'type' attribute.
+
 
 Special properties
 ------------------

tools/binman/etype/entry.py

@@ -72,7 +72,12 @@ class Entry(object):
         """
         if not etype:
             etype = fdt_util.GetString(node, 'type', node.name)
+
+        # Convert something like 'u-boot@0' to 'u_boot' since we are only
+        # interested in the type.
         module_name = etype.replace('-', '_')
+        if '@' in module_name:
+            module_name = module_name.split('@')[0]
         module = modules.get(module_name)
 
         # Import the module if we have not already done so.

tools/binman/ftest.py

@@ -909,6 +909,11 @@ class TestFunctional(unittest.TestCase):
                     sym_values + U_BOOT_SPL_DATA[16:])
         self.assertEqual(expected, data)
 
+    def testPackUnitAddress(self):
+        """Test that we support multiple binaries with the same name"""
+        data = self._DoReadFile('54_unit_address.dts')
+        self.assertEqual(U_BOOT_DATA + U_BOOT_DATA, data)
+
 
 if __name__ == "__main__":
     unittest.main()

tools/binman/test/54_unit_address.dts

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		u-boot@0 {
+		};
+		u-boot@1 {
+		};
+	};
+};