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![Simon Glass](/assets/img/avatar_default.png)
Since we are now using the bytes type in Python 3, the conversion in fdt32_to_cpu() is not necessary, so drop it. Also use 'int' instead of 'long' to convert the integer value, since 'long' is not present in Python 3. With this, test_fdt passes with both Python 2 and 3: PYTHONPATH=/tmp/b/sandbox_spl/scripts/dtc/pylibfdt python \ ./tools/dtoc/test_fdt -t PYTHONPATH=~/cosarm/dtc/pylibfdt:tools/patman python3 \ ./tools/dtoc/test_fdt -t Signed-off-by: Simon Glass <sjg@chromium.org>
201 lines
5.6 KiB
Python
201 lines
5.6 KiB
Python
#!/usr/bin/python
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# SPDX-License-Identifier: GPL-2.0+
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#
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# Copyright (C) 2016 Google, Inc
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# Written by Simon Glass <sjg@chromium.org>
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#
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# Utility functions for reading from a device tree. Once the upstream pylibfdt
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# implementation advances far enough, we should be able to drop these.
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import os
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import struct
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import sys
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import tempfile
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import command
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import tools
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def fdt32_to_cpu(val):
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"""Convert a device tree cell to an integer
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Args:
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Value to convert (4-character string representing the cell value)
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Return:
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A native-endian integer value
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"""
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return struct.unpack('>I', val)[0]
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def fdt_cells_to_cpu(val, cells):
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"""Convert one or two cells to a long integer
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Args:
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Value to convert (array of one or more 4-character strings)
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Return:
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A native-endian integer value
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"""
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if not cells:
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return 0
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out = int(fdt32_to_cpu(val[0]))
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if cells == 2:
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out = out << 32 | fdt32_to_cpu(val[1])
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return out
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def EnsureCompiled(fname, capture_stderr=False):
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"""Compile an fdt .dts source file into a .dtb binary blob if needed.
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Args:
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fname: Filename (if .dts it will be compiled). It not it will be
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left alone
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Returns:
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Filename of resulting .dtb file
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"""
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_, ext = os.path.splitext(fname)
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if ext != '.dts':
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return fname
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dts_input = tools.GetOutputFilename('source.dts')
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dtb_output = tools.GetOutputFilename('source.dtb')
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search_paths = [os.path.join(os.getcwd(), 'include')]
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root, _ = os.path.splitext(fname)
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args = ['-E', '-P', '-x', 'assembler-with-cpp', '-D__ASSEMBLY__']
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args += ['-Ulinux']
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for path in search_paths:
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args.extend(['-I', path])
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args += ['-o', dts_input, fname]
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command.Run('cc', *args)
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# If we don't have a directory, put it in the tools tempdir
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search_list = []
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for path in search_paths:
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search_list.extend(['-i', path])
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args = ['-I', 'dts', '-o', dtb_output, '-O', 'dtb',
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'-W', 'no-unit_address_vs_reg']
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args.extend(search_list)
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args.append(dts_input)
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dtc = os.environ.get('DTC') or 'dtc'
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command.Run(dtc, *args, capture_stderr=capture_stderr)
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return dtb_output
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def GetInt(node, propname, default=None):
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"""Get an integer from a property
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Args:
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node: Node object to read from
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propname: property name to read
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default: Default value to use if the node/property do not exist
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Returns:
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Integer value read, or default if none
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"""
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prop = node.props.get(propname)
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if not prop:
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return default
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if isinstance(prop.value, list):
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raise ValueError("Node '%s' property '%s' has list value: expecting "
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"a single integer" % (node.name, propname))
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value = fdt32_to_cpu(prop.value)
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return value
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def GetString(node, propname, default=None):
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"""Get a string from a property
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Args:
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node: Node object to read from
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propname: property name to read
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default: Default value to use if the node/property do not exist
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Returns:
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String value read, or default if none
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"""
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prop = node.props.get(propname)
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if not prop:
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return default
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value = prop.value
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if isinstance(value, list):
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raise ValueError("Node '%s' property '%s' has list value: expecting "
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"a single string" % (node.name, propname))
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return value
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def GetBool(node, propname, default=False):
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"""Get an boolean from a property
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Args:
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node: Node object to read from
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propname: property name to read
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default: Default value to use if the node/property do not exist
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Returns:
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Boolean value read, or default if none (if you set this to True the
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function will always return True)
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"""
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if propname in node.props:
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return True
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return default
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def GetByte(node, propname, default=None):
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"""Get an byte from a property
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Args:
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node: Node object to read from
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propname: property name to read
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default: Default value to use if the node/property do not exist
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Returns:
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Byte value read, or default if none
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"""
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prop = node.props.get(propname)
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if not prop:
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return default
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value = prop.value
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if isinstance(value, list):
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raise ValueError("Node '%s' property '%s' has list value: expecting "
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"a single byte" % (node.name, propname))
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if len(value) != 1:
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raise ValueError("Node '%s' property '%s' has length %d, expecting %d" %
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(node.name, propname, len(value), 1))
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return ord(value[0])
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def GetPhandleList(node, propname):
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"""Get a list of phandles from a property
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Args:
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node: Node object to read from
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propname: property name to read
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Returns:
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List of phandles read, each an integer
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"""
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prop = node.props.get(propname)
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if not prop:
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return None
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value = prop.value
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if not isinstance(value, list):
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value = [value]
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return [fdt32_to_cpu(v) for v in value]
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def GetDatatype(node, propname, datatype):
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"""Get a value of a given type from a property
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Args:
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node: Node object to read from
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propname: property name to read
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datatype: Type to read (str or int)
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Returns:
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value read, or None if none
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Raises:
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ValueError if datatype is not str or int
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"""
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if datatype == str:
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return GetString(node, propname)
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elif datatype == int:
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return GetInt(node, propname)
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raise ValueError("fdt_util internal error: Unknown data type '%s'" %
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datatype)
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