dtoc: Fix widening of int to bytes

At present an integer is converted to bytes incorrectly. The whole 32-bit
integer is inserted as the first element of the byte array, and the other
three bytes are skipped. This was not noticed because the unit test did
not check it, and the functional test was checking for wrong values.

Update the code to handle this as a special case. Add one more test to
cover all code paths.

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

test/py/tests/test_ofplatdata.py

@@ -20,7 +20,7 @@ byte 08
 bytearray 01 23 34
 int 3
 intarray 5 0 0 0
-longbytearray 09 00 00 00 00 00 00 00 00
+longbytearray 09 0a 0b 0c 00 00 00 00 00
 string message2
 stringarray "another" "multi-word" "message"
 of-platdata probe:

tools/dtoc/dtoc_test_simple.dts

@@ -41,6 +41,7 @@
 		u-boot,dm-pre-reloc;
 		compatible = "sandbox,spl-test";
 		stringarray = "one";
+		longbytearray = [09 0a 0b 0c 0d 0e 0f 10];
 	};
 
 	spl-test4 {

tools/dtoc/fdt.py

@@ -129,6 +129,15 @@ class Prop:
         specific.
         """
         if newprop.type < self.type:
+            # Special handling to convert an int into bytes
+            if self.type == TYPE_INT and newprop.type == TYPE_BYTE:
+                if type(self.value) == list:
+                    new_value = []
+                    for val in self.value:
+                        new_value += [tools.ToChar(by) for by in val]
+                else:
+                    new_value = [tools.ToChar(by) for by in self.value]
+                self.value = new_value
             self.type = newprop.type
 
         if type(newprop.value) == list and type(self.value) != list:

tools/dtoc/test_dtoc.py

@@ -255,7 +255,7 @@ static struct dtd_sandbox_spl_test dtv_spl_test2 = {
 \t.byteval\t\t= 0x8,
 \t.intarray\t\t= {0x5, 0x0, 0x0, 0x0},
 \t.intval\t\t\t= 0x3,
-\t.longbytearray\t\t= {0x9, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+\t.longbytearray\t\t= {0x9, 0xa, 0xb, 0xc, 0x0, 0x0, 0x0, 0x0,
 \t\t0x0},
 \t.stringarray\t\t= {"another", "multi-word", "message"},
 \t.stringval\t\t= "message2",
@@ -268,6 +268,8 @@ U_BOOT_DEVICE(spl_test2) = {
 
 /* Node /spl-test3 index 4 */
 static struct dtd_sandbox_spl_test dtv_spl_test3 = {
+\t.longbytearray\t\t= {0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 0x10,
+\t\t0x0},
 \t.stringarray\t\t= {"one", "", ""},
 };
 U_BOOT_DEVICE(spl_test3) = {

tools/dtoc/test_fdt.py

@@ -298,6 +298,7 @@ class TestProp(unittest.TestCase):
     def testWiden(self):
         """Test widening of values"""
         node2 = self.dtb.GetNode('/spl-test2')
+        node3 = self.dtb.GetNode('/spl-test3')
         prop = self.node.props['intval']
 
         # No action
@@ -316,11 +317,20 @@ class TestProp(unittest.TestCase):
         # byte array, it should turn into an array.
         prop = self.node.props['longbytearray']
         prop2 = node2.props['longbytearray']
+        prop3 = node3.props['longbytearray']
         self.assertFalse(isinstance(prop2.value, list))
         self.assertEqual(4, len(prop2.value))
+        self.assertEqual(b'\x09\x0a\x0b\x0c', prop2.value)
         prop2.Widen(prop)
         self.assertTrue(isinstance(prop2.value, list))
         self.assertEqual(9, len(prop2.value))
+        self.assertEqual(['\x09', '\x0a', '\x0b', '\x0c', '\0',
+                          '\0', '\0', '\0', '\0'], prop2.value)
+        prop3.Widen(prop)
+        self.assertTrue(isinstance(prop3.value, list))
+        self.assertEqual(9, len(prop3.value))
+        self.assertEqual(['\x09', '\x0a', '\x0b', '\x0c', '\x0d',
+                          '\x0e', '\x0f', '\x10', '\0'], prop3.value)
 
         # Similarly for a string array
         prop = self.node.props['stringval']