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
43 out = long(fdt32_to_cpu(val[0]))
45 out = out << 32 | fdt32_to_cpu(val[1])
48 def EnsureCompiled(fname):
49 """Compile an fdt .dts source file into a .dtb binary blob if needed.
52 fname: Filename (if .dts it will be compiled). It not it will be
56 Filename of resulting .dtb file
58 _, ext = os.path.splitext(fname)
62 dts_input = tools.GetOutputFilename('source.dts')
63 dtb_output = tools.GetOutputFilename('source.dtb')
65 search_paths = [os.path.join(os.getcwd(), 'include')]
66 root, _ = os.path.splitext(fname)
67 args = ['-E', '-P', '-x', 'assembler-with-cpp', '-D__ASSEMBLY__']
69 for path in search_paths:
70 args.extend(['-I', path])
71 args += ['-o', dts_input, fname]
72 command.Run('cc', *args)
74 # If we don't have a directory, put it in the tools tempdir
76 for path in search_paths:
77 search_list.extend(['-i', path])
78 args = ['-I', 'dts', '-o', dtb_output, '-O', 'dtb',
79 '-W', 'no-unit_address_vs_reg']
80 args.extend(search_list)
81 args.append(dts_input)
82 command.Run('dtc', *args)
85 def GetInt(node, propname, default=None):
86 prop = node.props.get(propname)
89 value = fdt32_to_cpu(prop.value)
90 if type(value) == type(list):
91 raise ValueError("Node '%s' property '%' has list value: expecting"
92 "a single integer" % (node.name, propname))
95 def GetString(node, propname, default=None):
96 prop = node.props.get(propname)
100 if type(value) == type(list):
101 raise ValueError("Node '%s' property '%' has list value: expecting"
102 "a single string" % (node.name, propname))
105 def GetBool(node, propname, default=False):
106 if propname in node.props: