mirror of
https://github.com/u-boot/u-boot.git
synced 2024-12-13 14:53:28 +08:00
8f224b3734
Provide easy helpers for reading integer, string and boolean values from device-tree properties. Signed-off-by: Simon Glass <sjg@chromium.org>
87 lines
2.3 KiB
Python
87 lines
2.3 KiB
Python
#!/usr/bin/python
|
|
#
|
|
# Copyright (C) 2016 Google, Inc
|
|
# Written by Simon Glass <sjg@chromium.org>
|
|
#
|
|
# SPDX-License-Identifier: GPL-2.0+
|
|
#
|
|
|
|
import os
|
|
import struct
|
|
import tempfile
|
|
|
|
import command
|
|
import tools
|
|
|
|
def fdt32_to_cpu(val):
|
|
"""Convert a device tree cell to an integer
|
|
|
|
Args:
|
|
Value to convert (4-character string representing the cell value)
|
|
|
|
Return:
|
|
A native-endian integer value
|
|
"""
|
|
return struct.unpack('>I', val)[0]
|
|
|
|
def EnsureCompiled(fname):
|
|
"""Compile an fdt .dts source file into a .dtb binary blob if needed.
|
|
|
|
Args:
|
|
fname: Filename (if .dts it will be compiled). It not it will be
|
|
left alone
|
|
|
|
Returns:
|
|
Filename of resulting .dtb file
|
|
"""
|
|
_, ext = os.path.splitext(fname)
|
|
if ext != '.dts':
|
|
return fname
|
|
|
|
dts_input = tools.GetOutputFilename('source.dts')
|
|
dtb_output = tools.GetOutputFilename('source.dtb')
|
|
|
|
search_paths = [os.path.join(os.getcwd(), 'include')]
|
|
root, _ = os.path.splitext(fname)
|
|
args = ['-E', '-P', '-x', 'assembler-with-cpp', '-D__ASSEMBLY__']
|
|
args += ['-Ulinux']
|
|
for path in search_paths:
|
|
args.extend(['-I', path])
|
|
args += ['-o', dts_input, fname]
|
|
command.Run('cc', *args)
|
|
|
|
# If we don't have a directory, put it in the tools tempdir
|
|
search_list = []
|
|
for path in search_paths:
|
|
search_list.extend(['-i', path])
|
|
args = ['-I', 'dts', '-o', dtb_output, '-O', 'dtb']
|
|
args.extend(search_list)
|
|
args.append(dts_input)
|
|
command.Run('dtc', *args)
|
|
return dtb_output
|
|
|
|
def GetInt(node, propname, default=None):
|
|
prop = node.props.get(propname)
|
|
if not prop:
|
|
return default
|
|
value = fdt32_to_cpu(prop.value)
|
|
if type(value) == type(list):
|
|
raise ValueError("Node '%s' property '%' has list value: expecting"
|
|
"a single integer" % (node.name, propname))
|
|
return value
|
|
|
|
def GetString(node, propname, default=None):
|
|
prop = node.props.get(propname)
|
|
if not prop:
|
|
return default
|
|
value = prop.value
|
|
if type(value) == type(list):
|
|
raise ValueError("Node '%s' property '%' has list value: expecting"
|
|
"a single string" % (node.name, propname))
|
|
return value
|
|
|
|
def GetBool(node, propname, default=False):
|
|
if propname in node.props:
|
|
return True
|
|
return default
|