3 # Copyright (C) 2016 Google, Inc
4 # Written by Simon Glass <sjg@chromium.org>
6 # SPDX-License-Identifier: GPL-2.0+
17 def fdt32_to_cpu(val):
18 """Convert a device tree cell to an integer
21 Value to convert (4-character string representing the cell value)
24 A native-endian integer value
26 if sys.version_info > (3, 0):
27 if isinstance(val, bytes):
28 val = val.decode('utf-8')
29 val = val.encode('raw_unicode_escape')
30 return struct.unpack('>I', val)[0]
32 def fdt_cells_to_cpu(val, cells):
33 """Convert one or two cells to a long integer
36 Value to convert (array of one or more 4-character strings)
39 A native-endian long value
41 out = long(fdt32_to_cpu(val[0]))
43 out = out << 32 | fdt32_to_cpu(val[1])
46 def EnsureCompiled(fname):
47 """Compile an fdt .dts source file into a .dtb binary blob if needed.
50 fname: Filename (if .dts it will be compiled). It not it will be
54 Filename of resulting .dtb file
56 _, ext = os.path.splitext(fname)
60 dts_input = tools.GetOutputFilename('source.dts')
61 dtb_output = tools.GetOutputFilename('source.dtb')
63 search_paths = [os.path.join(os.getcwd(), 'include')]
64 root, _ = os.path.splitext(fname)
65 args = ['-E', '-P', '-x', 'assembler-with-cpp', '-D__ASSEMBLY__']
67 for path in search_paths:
68 args.extend(['-I', path])
69 args += ['-o', dts_input, fname]
70 command.Run('cc', *args)
72 # If we don't have a directory, put it in the tools tempdir
74 for path in search_paths:
75 search_list.extend(['-i', path])
76 args = ['-I', 'dts', '-o', dtb_output, '-O', 'dtb']
77 args.extend(search_list)
78 args.append(dts_input)
79 command.Run('dtc', *args)
82 def GetInt(node, propname, default=None):
83 prop = node.props.get(propname)
86 value = fdt32_to_cpu(prop.value)
87 if type(value) == type(list):
88 raise ValueError("Node '%s' property '%' has list value: expecting"
89 "a single integer" % (node.name, propname))
92 def GetString(node, propname, default=None):
93 prop = node.props.get(propname)
97 if type(value) == type(list):
98 raise ValueError("Node '%s' property '%' has list value: expecting"
99 "a single string" % (node.name, propname))
102 def GetBool(node, propname, default=False):
103 if propname in node.props: