Drop this now-unused library and associated tests. Signed-off-by: Simon Glass <sjg@chromium.org>master
Simon Glass
7 years ago
parent
6d804eafc1
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160a766425
@ -1,181 +0,0 @@ |
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#!/usr/bin/python |
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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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# SPDX-License-Identifier: GPL-2.0+ |
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# |
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|
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import command |
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import fdt |
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from fdt import Fdt, NodeBase, PropBase |
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import fdt_util |
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import sys |
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# This deals with a device tree, presenting it as a list of Node and Prop |
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# objects, representing nodes and properties, respectively. |
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# |
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# This implementation uses the fdtget tool to access the device tree, so it |
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# is not very efficient for larger trees. The tool is called once for each |
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# node and property in the tree. |
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|
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class Prop(PropBase): |
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"""A device tree property |
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|
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Properties: |
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name: Property name (as per the device tree) |
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value: Property value as a string of bytes, or a list of strings of |
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bytes |
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type: Value type |
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""" |
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def __init__(self, node, name, byte_list_str): |
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PropBase.__init__(self, node, 0, name) |
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if not byte_list_str.strip(): |
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self.type = fdt.TYPE_BOOL |
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return |
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self.bytes = [chr(int(byte, 16)) |
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for byte in byte_list_str.strip().split(' ')] |
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self.type, self.value = self.BytesToValue(''.join(self.bytes)) |
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|
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class Node(NodeBase): |
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"""A device tree node |
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Properties: |
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name: Device tree node tname |
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path: Full path to node, along with the node name itself |
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_fdt: Device tree object |
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subnodes: A list of subnodes for this node, each a Node object |
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props: A dict of properties for this node, each a Prop object. |
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Keyed by property name |
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""" |
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def __init__(self, fdt, offset, name, path): |
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NodeBase.__init__(self, fdt, offset, name, path) |
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|
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def Scan(self): |
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"""Scan a node's properties and subnodes |
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This fills in the props and subnodes properties, recursively |
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searching into subnodes so that the entire tree is built. |
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""" |
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for name, byte_list_str in self._fdt.GetProps(self.path).items(): |
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prop = Prop(self, name, byte_list_str) |
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self.props[name] = prop |
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|
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for name in self._fdt.GetSubNodes(self.path): |
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sep = '' if self.path[-1] == '/' else '/' |
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path = self.path + sep + name |
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node = Node(self._fdt, 0, name, path) |
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self.subnodes.append(node) |
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node.Scan() |
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def DeleteProp(self, prop_name): |
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"""Delete a property of a node |
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The property is deleted using fdtput. |
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Args: |
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prop_name: Name of the property to delete |
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Raises: |
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CommandError if the property does not exist |
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""" |
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args = [self._fdt._fname, '-d', self.path, prop_name] |
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command.Output('fdtput', *args) |
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del self.props[prop_name] |
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|
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class FdtFallback(Fdt): |
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"""Provides simple access to a flat device tree blob using fdtget/fdtput |
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Properties: |
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See superclass |
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""" |
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def __init__(self, fname): |
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Fdt.__init__(self, fname) |
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if self._fname: |
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self._fname = fdt_util.EnsureCompiled(self._fname) |
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|
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def GetSubNodes(self, node): |
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"""Returns a list of sub-nodes of a given node |
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Args: |
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node: Node name to return children from |
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Returns: |
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List of children in the node (each a string node name) |
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Raises: |
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CmdError: if the node does not exist. |
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""" |
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out = command.Output('fdtget', self._fname, '-l', node) |
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return out.strip().splitlines() |
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|
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def GetProps(self, node): |
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"""Get all properties from a node |
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Args: |
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node: full path to node name to look in |
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Returns: |
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A dictionary containing all the properties, indexed by node name. |
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The entries are simply strings - no decoding of lists or numbers |
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is done. |
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Raises: |
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CmdError: if the node does not exist. |
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""" |
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out = command.Output('fdtget', self._fname, node, '-p') |
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props = out.strip().splitlines() |
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props_dict = {} |
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for prop in props: |
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name = prop |
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props_dict[prop] = self.GetProp(node, name) |
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return props_dict |
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def GetProp(self, node, prop, default=None, typespec=None): |
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"""Get a property from a device tree. |
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This looks up the given node and property, and returns the value as a |
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string, |
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If the node or property does not exist, this will return the default |
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value. |
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Args: |
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node: Full path to node to look up. |
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prop: Property name to look up. |
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default: Default value to return if nothing is present in the fdt, |
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or None to raise in this case. This will be converted to a |
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string. |
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typespec: Type character to use (None for default, 's' for string) |
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Returns: |
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string containing the property value. |
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Raises: |
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CmdError: if the property does not exist and no default is provided. |
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""" |
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args = [self._fname, node, prop, '-t', 'bx'] |
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if default is not None: |
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args += ['-d', str(default)] |
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if typespec is not None: |
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args += ['-t', typespec] |
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out = command.Output('fdtget', *args) |
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return out.strip() |
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@classmethod |
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def Node(self, fdt, offset, name, path): |
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"""Create a new node |
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This is used by Fdt.Scan() to create a new node using the correct |
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class. |
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Args: |
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fdt: Fdt object |
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offset: Offset of node |
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name: Node name |
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path: Full path to node |
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""" |
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node = Node(fdt, offset, name, path) |
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return node |
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