dtoc: Add support for reading 64-bit ints

Add functions to read a 64-bit integer property from the devicetree.

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

tools/dtoc/fdt_util.py

@@ -27,6 +27,18 @@ def fdt32_to_cpu(val):
     """
     return struct.unpack('>I', val)[0]
 
+def fdt64_to_cpu(val):
+    """Convert a device tree cell to an integer
+
+    Args:
+        val (list): Value to convert (list of 2 4-character strings representing
+            the cell value)
+
+    Return:
+        int: A native-endian integer value
+    """
+    return fdt32_to_cpu(val[0]) << 32 | fdt32_to_cpu(val[1])
+
 def fdt_cells_to_cpu(val, cells):
     """Convert one or two cells to a long integer
 
@@ -108,6 +120,29 @@ def GetInt(node, propname, default=None):
     value = fdt32_to_cpu(prop.value)
     return value
 
+def GetInt64(node, propname, default=None):
+    """Get a 64-bit integer from a property
+
+    Args:
+        node (Node): Node object to read from
+        propname (str): property name to read
+        default (int): Default value to use if the node/property do not exist
+
+    Returns:
+        int: value read, or default if none
+
+    Raises:
+        ValueError: Property is not of the correct size
+    """
+    prop = node.props.get(propname)
+    if not prop:
+        return default
+    if not isinstance(prop.value, list) or len(prop.value) != 2:
+        raise ValueError("Node '%s' property '%s' should be a list with 2 items for 64-bit values" %
+                         (node.name, propname))
+    value = fdt64_to_cpu(prop.value)
+    return value
+
 def GetString(node, propname, default=None):
     """Get a string from a property
 

tools/dtoc/test/dtoc_test_simple.dts

@@ -16,6 +16,7 @@
 		boolval;
 		maybe-empty-int = <>;
 		intval = <1>;
+		int64val = /bits/ 64 <0x123456789abcdef0>;
 		intarray = <2 3 4>;
 		byteval = [05];
 		bytearray = [06];

tools/dtoc/test_dtoc.py

@@ -296,6 +296,7 @@ struct dtd_sandbox_spl_test {
 \tbool\t\tboolval;
 \tunsigned char\tbytearray[3];
 \tunsigned char\tbyteval;
+\tfdt32_t\t\tint64val[2];
 \tfdt32_t\t\tintarray[3];
 \tfdt32_t\t\tintval;
 \tunsigned char\tlongbytearray[9];
@@ -355,6 +356,7 @@ static struct dtd_sandbox_spl_test dtv_spl_test = {
 \t.boolval\t\t= true,
 \t.bytearray\t\t= {0x6, 0x0, 0x0},
 \t.byteval\t\t= 0x5,
+\t.int64val\t\t= {0x12345678, 0x9abcdef0},
 \t.intarray\t\t= {0x2, 0x3, 0x4},
 \t.intval\t\t\t= 0x1,
 \t.longbytearray\t\t= {0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 0x10,

tools/dtoc/test_fdt.py

@@ -24,7 +24,7 @@ sys.path.insert(2, os.path.join(our_path,
 
 from dtoc import fdt
 from dtoc import fdt_util
-from dtoc.fdt_util import fdt32_to_cpu
+from dtoc.fdt_util import fdt32_to_cpu, fdt64_to_cpu
 from fdt import Type, BytesToValue
 import libfdt
 from patman import command
@@ -128,7 +128,7 @@ class TestFdt(unittest.TestCase):
         node = self.dtb.GetNode('/spl-test')
         props = self.dtb.GetProps(node)
         self.assertEqual(['boolval', 'bytearray', 'byteval', 'compatible',
-                          'intarray', 'intval', 'longbytearray',
+                          'int64val', 'intarray', 'intval', 'longbytearray',
                           'maybe-empty-int', 'notstring', 'stringarray',
                           'stringval', 'u-boot,dm-pre-reloc'],
                          sorted(props.keys()))
@@ -335,6 +335,10 @@ class TestProp(unittest.TestCase):
         self.assertEqual(Type.INT, prop.type)
         self.assertEqual(1, fdt32_to_cpu(prop.value))
 
+        prop = self._ConvertProp('int64val')
+        self.assertEqual(Type.INT, prop.type)
+        self.assertEqual(0x123456789abcdef0, fdt64_to_cpu(prop.value))
+
         prop = self._ConvertProp('intarray')
         self.assertEqual(Type.INT, prop.type)
         val = [fdt32_to_cpu(val) for val in prop.value]
@@ -586,10 +590,21 @@ class TestFdtUtil(unittest.TestCase):
         self.assertEqual(3, fdt_util.GetInt(self.node, 'missing', 3))
 
         with self.assertRaises(ValueError) as e:
-            self.assertEqual(3, fdt_util.GetInt(self.node, 'intarray'))
+            fdt_util.GetInt(self.node, 'intarray')
         self.assertIn("property 'intarray' has list value: expecting a single "
                       'integer', str(e.exception))
 
+    def testGetInt64(self):
+        self.assertEqual(0x123456789abcdef0,
+                         fdt_util.GetInt64(self.node, 'int64val'))
+        self.assertEqual(3, fdt_util.GetInt64(self.node, 'missing', 3))
+
+        with self.assertRaises(ValueError) as e:
+            fdt_util.GetInt64(self.node, 'intarray')
+        self.assertIn(
+            "property 'intarray' should be a list with 2 items for 64-bit values",
+            str(e.exception))
+
     def testGetString(self):
         self.assertEqual('message', fdt_util.GetString(self.node, 'stringval'))
         self.assertEqual('test', fdt_util.GetString(self.node, 'missing',