mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-21 02:33:07 +00:00
43ba492670
At present if a driver is missing a uclass or compatible stirng, this is silently ignored. This makes sense in most cases, particularly for the compatible string, since it is not required except when the driver is used with of-platdata. But it is also not very helpful. When there is some sort of problem with a driver, the missing compatible string (for example) may be the cause. Add a warning in this case, showing it only for drivers which are used by the build. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Walter Lozano <walter.lozano@collabora.com>
766 lines
29 KiB
Python
766 lines
29 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) 2017 Google, Inc
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# Written by Simon Glass <sjg@chromium.org>
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#
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"""Scanning of U-Boot source for drivers and structs
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This scans the source tree to find out things about all instances of
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U_BOOT_DRIVER(), UCLASS_DRIVER and all struct declarations in header files.
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See doc/driver-model/of-plat.rst for more informaiton
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"""
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import collections
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import os
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import re
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import sys
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def conv_name_to_c(name):
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"""Convert a device-tree name to a C identifier
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This uses multiple replace() calls instead of re.sub() since it is faster
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(400ms for 1m calls versus 1000ms for the 're' version).
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Args:
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name (str): Name to convert
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Return:
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str: String containing the C version of this name
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"""
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new = name.replace('@', '_at_')
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new = new.replace('-', '_')
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new = new.replace(',', '_')
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new = new.replace('.', '_')
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if new == '/':
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return 'root'
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return new
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def get_compat_name(node):
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"""Get the node's list of compatible string as a C identifiers
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Args:
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node (fdt.Node): Node object to check
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Return:
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list of str: List of C identifiers for all the compatible strings
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"""
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compat = node.props['compatible'].value
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if not isinstance(compat, list):
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compat = [compat]
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return [conv_name_to_c(c) for c in compat]
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class Driver:
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"""Information about a driver in U-Boot
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Attributes:
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name: Name of driver. For U_BOOT_DRIVER(x) this is 'x'
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fname: Filename where the driver was found
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uclass_id: Name of uclass, e.g. 'UCLASS_I2C'
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compat: Driver data for each compatible string:
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key: Compatible string, e.g. 'rockchip,rk3288-grf'
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value: Driver data, e,g, 'ROCKCHIP_SYSCON_GRF', or None
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fname: Filename where the driver was found
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priv (str): struct name of the priv_auto member, e.g. 'serial_priv'
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plat (str): struct name of the plat_auto member, e.g. 'serial_plat'
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child_priv (str): struct name of the per_child_auto member,
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e.g. 'pci_child_priv'
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child_plat (str): struct name of the per_child_plat_auto member,
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e.g. 'pci_child_plat'
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used (bool): True if the driver is used by the structs being output
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phase (str): Which phase of U-Boot to use this driver
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headers (list): List of header files needed for this driver (each a str)
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e.g. ['<asm/cpu.h>']
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dups (list): Driver objects with the same name as this one, that were
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found after this one
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warn_dups (bool): True if the duplicates are not distinguisble using
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the phase
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uclass (Uclass): uclass for this driver
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"""
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def __init__(self, name, fname):
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self.name = name
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self.fname = fname
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self.uclass_id = None
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self.compat = None
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self.priv = ''
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self.plat = ''
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self.child_priv = ''
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self.child_plat = ''
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self.used = False
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self.phase = ''
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self.headers = []
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self.dups = []
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self.warn_dups = False
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self.uclass = None
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def __eq__(self, other):
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return (self.name == other.name and
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self.uclass_id == other.uclass_id and
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self.compat == other.compat and
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self.priv == other.priv and
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self.plat == other.plat and
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self.used == other.used)
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def __repr__(self):
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return ("Driver(name='%s', used=%s, uclass_id='%s', compat=%s, priv=%s)" %
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(self.name, self.used, self.uclass_id, self.compat, self.priv))
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class UclassDriver:
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"""Holds information about a uclass driver
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Attributes:
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name: Uclass name, e.g. 'i2c' if the driver is for UCLASS_I2C
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uclass_id: Uclass ID, e.g. 'UCLASS_I2C'
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priv: struct name of the private data, e.g. 'i2c_priv'
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per_dev_priv (str): struct name of the priv_auto member, e.g. 'spi_info'
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per_dev_plat (str): struct name of the plat_auto member, e.g. 'i2c_chip'
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per_child_priv (str): struct name of the per_child_auto member,
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e.g. 'pci_child_priv'
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per_child_plat (str): struct name of the per_child_plat_auto member,
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e.g. 'pci_child_plat'
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alias_num_to_node (dict): Aliases for this uclasses (for sequence
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numbers)
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key (int): Alias number, e.g. 2 for "pci2"
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value (str): Node the alias points to
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alias_path_to_num (dict): Convert a path to an alias number
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key (str): Full path to node (e.g. '/soc/pci')
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seq (int): Alias number, e.g. 2 for "pci2"
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devs (list): List of devices in this uclass, each a Node
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node_refs (dict): References in the linked list of devices:
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key (int): Sequence number (0=first, n-1=last, -1=head, n=tail)
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value (str): Reference to the device at that position
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"""
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def __init__(self, name):
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self.name = name
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self.uclass_id = None
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self.priv = ''
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self.per_dev_priv = ''
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self.per_dev_plat = ''
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self.per_child_priv = ''
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self.per_child_plat = ''
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self.alias_num_to_node = {}
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self.alias_path_to_num = {}
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self.devs = []
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self.node_refs = {}
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def __eq__(self, other):
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return (self.name == other.name and
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self.uclass_id == other.uclass_id and
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self.priv == other.priv)
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def __repr__(self):
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return ("UclassDriver(name='%s', uclass_id='%s')" %
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(self.name, self.uclass_id))
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def __hash__(self):
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# We can use the uclass ID since it is unique among uclasses
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return hash(self.uclass_id)
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class Struct:
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"""Holds information about a struct definition
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Attributes:
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name: Struct name, e.g. 'fred' if the struct is 'struct fred'
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fname: Filename containing the struct, in a format that C files can
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include, e.g. 'asm/clk.h'
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"""
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def __init__(self, name, fname):
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self.name = name
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self.fname =fname
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def __repr__(self):
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return ("Struct(name='%s', fname='%s')" % (self.name, self.fname))
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class Scanner:
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"""Scanning of the U-Boot source tree
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Properties:
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_basedir (str): Base directory of U-Boot source code. Defaults to the
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grandparent of this file's directory
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_drivers: Dict of valid driver names found in drivers/
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key: Driver name
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value: Driver for that driver
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_driver_aliases: Dict that holds aliases for driver names
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key: Driver alias declared with
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DM_DRIVER_ALIAS(driver_alias, driver_name)
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value: Driver name declared with U_BOOT_DRIVER(driver_name)
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_drivers_additional (list or str): List of additional drivers to use
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during scanning
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_warnings: Dict of warnings found:
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key: Driver name
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value: Set of warnings
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_of_match: Dict holding information about compatible strings
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key: Name of struct udevice_id variable
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value: Dict of compatible info in that variable:
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key: Compatible string, e.g. 'rockchip,rk3288-grf'
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value: Driver data, e,g, 'ROCKCHIP_SYSCON_GRF', or None
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_compat_to_driver: Maps compatible strings to Driver
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_uclass: Dict of uclass information
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key: uclass name, e.g. 'UCLASS_I2C'
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value: UClassDriver
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_structs: Dict of all structs found in U-Boot:
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key: Name of struct
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value: Struct object
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_phase: The phase of U-Boot that we are generating data for, e.g. 'spl'
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or 'tpl'. None if not known
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"""
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def __init__(self, basedir, drivers_additional, phase=''):
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"""Set up a new Scanner
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"""
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if not basedir:
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basedir = sys.argv[0].replace('tools/dtoc/dtoc', '')
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if basedir == '':
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basedir = './'
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self._basedir = basedir
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self._drivers = {}
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self._driver_aliases = {}
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self._drivers_additional = drivers_additional or []
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self._missing_drivers = set()
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self._warnings = collections.defaultdict(set)
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self._of_match = {}
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self._compat_to_driver = {}
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self._uclass = {}
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self._structs = {}
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self._phase = phase
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def get_driver(self, name):
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"""Get a driver given its name
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Args:
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name (str): Driver name
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Returns:
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Driver: Driver or None if not found
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"""
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return self._drivers.get(name)
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def get_normalized_compat_name(self, node):
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"""Get a node's normalized compat name
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Returns a valid driver name by retrieving node's list of compatible
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string as a C identifier and performing a check against _drivers
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and a lookup in driver_aliases printing a warning in case of failure.
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Args:
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node (Node): Node object to check
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Return:
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Tuple:
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Driver name associated with the first compatible string
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List of C identifiers for all the other compatible strings
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(possibly empty)
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In case of no match found, the return will be the same as
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get_compat_name()
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"""
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if not node.parent:
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compat_list_c = ['root_driver']
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else:
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compat_list_c = get_compat_name(node)
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for compat_c in compat_list_c:
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if not compat_c in self._drivers.keys():
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compat_c = self._driver_aliases.get(compat_c)
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if not compat_c:
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continue
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aliases_c = compat_list_c
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if compat_c in aliases_c:
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aliases_c.remove(compat_c)
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return compat_c, aliases_c
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name = compat_list_c[0]
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self._missing_drivers.add(name)
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self._warnings[name].add(
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'WARNING: the driver %s was not found in the driver list' % name)
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return compat_list_c[0], compat_list_c[1:]
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def _parse_structs(self, fname, buff):
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"""Parse a H file to extract struct definitions contained within
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This parses 'struct xx {' definitions to figure out what structs this
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header defines.
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Args:
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buff (str): Contents of file
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fname (str): Filename (to use when printing errors)
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"""
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structs = {}
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re_struct = re.compile('^struct ([a-z0-9_]+) {$')
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re_asm = re.compile('../arch/[a-z0-9]+/include/asm/(.*)')
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prefix = ''
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for line in buff.splitlines():
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# Handle line continuation
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if prefix:
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line = prefix + line
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prefix = ''
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if line.endswith('\\'):
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prefix = line[:-1]
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continue
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m_struct = re_struct.match(line)
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if m_struct:
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name = m_struct.group(1)
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include_dir = os.path.join(self._basedir, 'include')
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rel_fname = os.path.relpath(fname, include_dir)
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m_asm = re_asm.match(rel_fname)
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if m_asm:
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rel_fname = 'asm/' + m_asm.group(1)
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structs[name] = Struct(name, rel_fname)
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self._structs.update(structs)
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@classmethod
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def _get_re_for_member(cls, member):
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"""_get_re_for_member: Get a compiled regular expression
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Args:
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member (str): Struct member name, e.g. 'priv_auto'
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Returns:
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re.Pattern: Compiled regular expression that parses:
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.member = sizeof(struct fred),
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and returns "fred" as group 1
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"""
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return re.compile(r'^\s*.%s\s*=\s*sizeof\(struct\s+(.*)\),$' % member)
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def _parse_uclass_driver(self, fname, buff):
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"""Parse a C file to extract uclass driver information contained within
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This parses UCLASS_DRIVER() structs to obtain various pieces of useful
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information.
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It updates the following member:
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_uclass: Dict of uclass information
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key: uclass name, e.g. 'UCLASS_I2C'
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value: UClassDriver
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Args:
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fname (str): Filename being parsed (used for warnings)
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buff (str): Contents of file
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"""
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uc_drivers = {}
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# Collect the driver name and associated Driver
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driver = None
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re_driver = re.compile(r'^UCLASS_DRIVER\((.*)\)')
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# Collect the uclass ID, e.g. 'UCLASS_SPI'
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re_id = re.compile(r'\s*\.id\s*=\s*(UCLASS_[A-Z0-9_]+)')
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# Matches the header/size information for uclass-private data
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re_priv = self._get_re_for_member('priv_auto')
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# Set up parsing for the auto members
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re_per_device_priv = self._get_re_for_member('per_device_auto')
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re_per_device_plat = self._get_re_for_member('per_device_plat_auto')
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re_per_child_priv = self._get_re_for_member('per_child_auto')
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re_per_child_plat = self._get_re_for_member('per_child_plat_auto')
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prefix = ''
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for line in buff.splitlines():
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# Handle line continuation
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if prefix:
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line = prefix + line
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prefix = ''
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if line.endswith('\\'):
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prefix = line[:-1]
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continue
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driver_match = re_driver.search(line)
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# If we have seen UCLASS_DRIVER()...
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if driver:
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m_id = re_id.search(line)
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m_priv = re_priv.match(line)
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m_per_dev_priv = re_per_device_priv.match(line)
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m_per_dev_plat = re_per_device_plat.match(line)
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m_per_child_priv = re_per_child_priv.match(line)
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m_per_child_plat = re_per_child_plat.match(line)
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if m_id:
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driver.uclass_id = m_id.group(1)
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elif m_priv:
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driver.priv = m_priv.group(1)
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elif m_per_dev_priv:
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driver.per_dev_priv = m_per_dev_priv.group(1)
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elif m_per_dev_plat:
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driver.per_dev_plat = m_per_dev_plat.group(1)
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elif m_per_child_priv:
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driver.per_child_priv = m_per_child_priv.group(1)
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elif m_per_child_plat:
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driver.per_child_plat = m_per_child_plat.group(1)
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elif '};' in line:
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if not driver.uclass_id:
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raise ValueError(
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"%s: Cannot parse uclass ID in driver '%s'" %
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(fname, driver.name))
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uc_drivers[driver.uclass_id] = driver
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driver = None
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elif driver_match:
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driver_name = driver_match.group(1)
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driver = UclassDriver(driver_name)
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self._uclass.update(uc_drivers)
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def _parse_driver(self, fname, buff):
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"""Parse a C file to extract driver information contained within
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This parses U_BOOT_DRIVER() structs to obtain various pieces of useful
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information.
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It updates the following members:
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_drivers - updated with new Driver records for each driver found
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in the file
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_of_match - updated with each compatible string found in the file
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_compat_to_driver - Maps compatible string to Driver
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_driver_aliases - Maps alias names to driver name
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Args:
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fname (str): Filename being parsed (used for warnings)
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buff (str): Contents of file
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Raises:
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ValueError: Compatible variable is mentioned in .of_match in
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U_BOOT_DRIVER() but not found in the file
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"""
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# Dict holding information about compatible strings collected in this
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# function so far
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# key: Name of struct udevice_id variable
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# value: Dict of compatible info in that variable:
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# key: Compatible string, e.g. 'rockchip,rk3288-grf'
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# value: Driver data, e,g, 'ROCKCHIP_SYSCON_GRF', or None
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of_match = {}
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# Dict holding driver information collected in this function so far
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# key: Driver name (C name as in U_BOOT_DRIVER(xxx))
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# value: Driver
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drivers = {}
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# Collect the driver info
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driver = None
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re_driver = re.compile(r'^U_BOOT_DRIVER\((.*)\)')
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# Collect the uclass ID, e.g. 'UCLASS_SPI'
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re_id = re.compile(r'\s*\.id\s*=\s*(UCLASS_[A-Z0-9_]+)')
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# Collect the compatible string, e.g. 'rockchip,rk3288-grf'
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compat = None
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re_compat = re.compile(r'{\s*\.compatible\s*=\s*"(.*)"\s*'
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r'(,\s*\.data\s*=\s*(\S*))?\s*},')
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# This is a dict of compatible strings that were found:
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# key: Compatible string, e.g. 'rockchip,rk3288-grf'
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# value: Driver data, e,g, 'ROCKCHIP_SYSCON_GRF', or None
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compat_dict = {}
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# Holds the var nane of the udevice_id list, e.g.
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# 'rk3288_syscon_ids_noc' in
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# static const struct udevice_id rk3288_syscon_ids_noc[] = {
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ids_name = None
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re_ids = re.compile(r'struct udevice_id (.*)\[\]\s*=')
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|
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# Matches the references to the udevice_id list
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re_of_match = re.compile(
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r'\.of_match\s*=\s*(of_match_ptr\()?([a-z0-9_]+)([^,]*),')
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re_phase = re.compile('^\s*DM_PHASE\((.*)\).*$')
|
|
re_hdr = re.compile('^\s*DM_HEADER\((.*)\).*$')
|
|
re_alias = re.compile(r'DM_DRIVER_ALIAS\(\s*(\w+)\s*,\s*(\w+)\s*\)')
|
|
|
|
# Matches the struct name for priv, plat
|
|
re_priv = self._get_re_for_member('priv_auto')
|
|
re_plat = self._get_re_for_member('plat_auto')
|
|
re_child_priv = self._get_re_for_member('per_child_auto')
|
|
re_child_plat = self._get_re_for_member('per_child_plat_auto')
|
|
|
|
prefix = ''
|
|
for line in buff.splitlines():
|
|
# Handle line continuation
|
|
if prefix:
|
|
line = prefix + line
|
|
prefix = ''
|
|
if line.endswith('\\'):
|
|
prefix = line[:-1]
|
|
continue
|
|
|
|
driver_match = re_driver.search(line)
|
|
|
|
# If this line contains U_BOOT_DRIVER()...
|
|
if driver:
|
|
m_id = re_id.search(line)
|
|
m_of_match = re_of_match.search(line)
|
|
m_priv = re_priv.match(line)
|
|
m_plat = re_plat.match(line)
|
|
m_cplat = re_child_plat.match(line)
|
|
m_cpriv = re_child_priv.match(line)
|
|
m_phase = re_phase.match(line)
|
|
m_hdr = re_hdr.match(line)
|
|
if m_priv:
|
|
driver.priv = m_priv.group(1)
|
|
elif m_plat:
|
|
driver.plat = m_plat.group(1)
|
|
elif m_cplat:
|
|
driver.child_plat = m_cplat.group(1)
|
|
elif m_cpriv:
|
|
driver.child_priv = m_cpriv.group(1)
|
|
elif m_id:
|
|
driver.uclass_id = m_id.group(1)
|
|
elif m_of_match:
|
|
compat = m_of_match.group(2)
|
|
suffix = m_of_match.group(3)
|
|
if suffix and suffix != ')':
|
|
self._warnings[driver.name].add(
|
|
"%s: Warning: unexpected suffix '%s' on .of_match line for compat '%s'" %
|
|
(fname, suffix, compat))
|
|
elif m_phase:
|
|
driver.phase = m_phase.group(1)
|
|
elif m_hdr:
|
|
driver.headers.append(m_hdr.group(1))
|
|
elif '};' in line:
|
|
is_root = driver.name == 'root_driver'
|
|
if driver.uclass_id and (compat or is_root):
|
|
if not is_root:
|
|
if compat not in of_match:
|
|
raise ValueError(
|
|
"%s: Unknown compatible var '%s' (found: %s)" %
|
|
(fname, compat, ','.join(of_match.keys())))
|
|
driver.compat = of_match[compat]
|
|
|
|
# This needs to be deterministic, since a driver may
|
|
# have multiple compatible strings pointing to it.
|
|
# We record the one earliest in the alphabet so it
|
|
# will produce the same result on all machines.
|
|
for compat_id in of_match[compat]:
|
|
old = self._compat_to_driver.get(compat_id)
|
|
if not old or driver.name < old.name:
|
|
self._compat_to_driver[compat_id] = driver
|
|
drivers[driver.name] = driver
|
|
else:
|
|
# The driver does not have a uclass or compat string.
|
|
# The first is required but the second is not, so just
|
|
# ignore this.
|
|
if not driver.uclass_id:
|
|
warn = 'Missing .uclass'
|
|
else:
|
|
warn = 'Missing .compatible'
|
|
self._warnings[driver.name].add('%s in %s' %
|
|
(warn, fname))
|
|
driver = None
|
|
ids_name = None
|
|
compat = None
|
|
compat_dict = {}
|
|
|
|
elif ids_name:
|
|
compat_m = re_compat.search(line)
|
|
if compat_m:
|
|
compat_dict[compat_m.group(1)] = compat_m.group(3)
|
|
elif '};' in line:
|
|
of_match[ids_name] = compat_dict
|
|
ids_name = None
|
|
elif driver_match:
|
|
driver_name = driver_match.group(1)
|
|
driver = Driver(driver_name, fname)
|
|
else:
|
|
ids_m = re_ids.search(line)
|
|
m_alias = re_alias.match(line)
|
|
if ids_m:
|
|
ids_name = ids_m.group(1)
|
|
elif m_alias:
|
|
self._driver_aliases[m_alias.group(2)] = m_alias.group(1)
|
|
|
|
# Make the updates based on what we found
|
|
for driver in drivers.values():
|
|
if driver.name in self._drivers:
|
|
orig = self._drivers[driver.name]
|
|
if self._phase:
|
|
# If the original driver matches our phase, use it
|
|
if orig.phase == self._phase:
|
|
orig.dups.append(driver)
|
|
continue
|
|
|
|
# Otherwise use the new driver, which is assumed to match
|
|
else:
|
|
# We have no way of distinguishing them
|
|
driver.warn_dups = True
|
|
driver.dups.append(orig)
|
|
self._drivers[driver.name] = driver
|
|
self._of_match.update(of_match)
|
|
|
|
def show_warnings(self):
|
|
"""Show any warnings that have been collected"""
|
|
used_drivers = [drv.name for drv in self._drivers.values() if drv.used]
|
|
missing = self._missing_drivers.copy()
|
|
for name in sorted(self._warnings.keys()):
|
|
if name in missing or name in used_drivers:
|
|
warns = sorted(list(self._warnings[name]))
|
|
print('%s: %s' % (name, warns[0]))
|
|
indent = ' ' * len(name)
|
|
for warn in warns[1:]:
|
|
print('%-s: %s' % (indent, warn))
|
|
if name in missing:
|
|
missing.remove(name)
|
|
print()
|
|
|
|
def scan_driver(self, fname):
|
|
"""Scan a driver file to build a list of driver names and aliases
|
|
|
|
It updates the following members:
|
|
_drivers - updated with new Driver records for each driver found
|
|
in the file
|
|
_of_match - updated with each compatible string found in the file
|
|
_compat_to_driver - Maps compatible string to Driver
|
|
_driver_aliases - Maps alias names to driver name
|
|
|
|
Args
|
|
fname: Driver filename to scan
|
|
"""
|
|
with open(fname, encoding='utf-8') as inf:
|
|
try:
|
|
buff = inf.read()
|
|
except UnicodeDecodeError:
|
|
# This seems to happen on older Python versions
|
|
print("Skipping file '%s' due to unicode error" % fname)
|
|
return
|
|
|
|
# If this file has any U_BOOT_DRIVER() declarations, process it to
|
|
# obtain driver information
|
|
if 'U_BOOT_DRIVER' in buff:
|
|
self._parse_driver(fname, buff)
|
|
if 'UCLASS_DRIVER' in buff:
|
|
self._parse_uclass_driver(fname, buff)
|
|
|
|
def scan_header(self, fname):
|
|
"""Scan a header file to build a list of struct definitions
|
|
|
|
It updates the following members:
|
|
_structs - updated with new Struct records for each struct found
|
|
in the file
|
|
|
|
Args
|
|
fname: header filename to scan
|
|
"""
|
|
with open(fname, encoding='utf-8') as inf:
|
|
try:
|
|
buff = inf.read()
|
|
except UnicodeDecodeError:
|
|
# This seems to happen on older Python versions
|
|
print("Skipping file '%s' due to unicode error" % fname)
|
|
return
|
|
|
|
# If this file has any U_BOOT_DRIVER() declarations, process it to
|
|
# obtain driver information
|
|
if 'struct' in buff:
|
|
self._parse_structs(fname, buff)
|
|
|
|
def scan_drivers(self):
|
|
"""Scan the driver folders to build a list of driver names and aliases
|
|
|
|
This procedure will populate self._drivers and self._driver_aliases
|
|
"""
|
|
for (dirpath, _, filenames) in os.walk(self._basedir):
|
|
rel_path = dirpath[len(self._basedir):]
|
|
if rel_path.startswith('/'):
|
|
rel_path = rel_path[1:]
|
|
if rel_path.startswith('build') or rel_path.startswith('.git'):
|
|
continue
|
|
for fname in filenames:
|
|
pathname = dirpath + '/' + fname
|
|
if fname.endswith('.c'):
|
|
self.scan_driver(pathname)
|
|
elif fname.endswith('.h'):
|
|
self.scan_header(pathname)
|
|
for fname in self._drivers_additional:
|
|
if not isinstance(fname, str) or len(fname) == 0:
|
|
continue
|
|
if fname[0] == '/':
|
|
self.scan_driver(fname)
|
|
else:
|
|
self.scan_driver(self._basedir + '/' + fname)
|
|
|
|
# Get the uclass for each driver
|
|
# TODO: Can we just get the uclass for the ones we use, e.g. in
|
|
# mark_used()?
|
|
for driver in self._drivers.values():
|
|
driver.uclass = self._uclass.get(driver.uclass_id)
|
|
|
|
def mark_used(self, nodes):
|
|
"""Mark the drivers associated with a list of nodes as 'used'
|
|
|
|
This takes a list of nodes, finds the driver for each one and marks it
|
|
as used.
|
|
|
|
If two used drivers have the same name, issue a warning.
|
|
|
|
Args:
|
|
nodes (list of None): Nodes that are in use
|
|
"""
|
|
# Figure out which drivers we actually use
|
|
for node in nodes:
|
|
struct_name, _ = self.get_normalized_compat_name(node)
|
|
driver = self._drivers.get(struct_name)
|
|
if driver:
|
|
driver.used = True
|
|
if driver.dups and driver.warn_dups:
|
|
print("Warning: Duplicate driver name '%s' (orig=%s, dups=%s)" %
|
|
(driver.name, driver.fname,
|
|
', '.join([drv.fname for drv in driver.dups])))
|
|
|
|
def add_uclass_alias(self, name, num, node):
|
|
"""Add an alias to a uclass
|
|
|
|
Args:
|
|
name: Name of uclass, e.g. 'i2c'
|
|
num: Alias number, e.g. 2 for alias 'i2c2'
|
|
node: Node the alias points to, or None if None
|
|
|
|
Returns:
|
|
True if the node was added
|
|
False if the node was not added (uclass of that name not found)
|
|
None if the node could not be added because it was None
|
|
"""
|
|
for uclass in self._uclass.values():
|
|
if uclass.name == name:
|
|
if node is None:
|
|
return None
|
|
uclass.alias_num_to_node[int(num)] = node
|
|
uclass.alias_path_to_num[node.path] = int(num)
|
|
return True
|
|
return False
|
|
|
|
def assign_seq(self, node):
|
|
"""Figure out the sequence number for a node
|
|
|
|
This looks in the node's uclass and assigns a sequence number if needed,
|
|
based on the aliases and other nodes in that uclass.
|
|
|
|
It updates the uclass alias_path_to_num and alias_num_to_node
|
|
|
|
Args:
|
|
node (Node): Node object to look up
|
|
"""
|
|
if node.driver and node.seq == -1 and node.uclass:
|
|
uclass = node.uclass
|
|
num = uclass.alias_path_to_num.get(node.path)
|
|
if num is not None:
|
|
return num
|
|
else:
|
|
# Dynamically allocate the next available value after all
|
|
# existing ones
|
|
if uclass.alias_num_to_node:
|
|
start = max(uclass.alias_num_to_node.keys())
|
|
else:
|
|
start = -1
|
|
for seq in range(start + 1, 1000):
|
|
if seq not in uclass.alias_num_to_node:
|
|
break
|
|
uclass.alias_path_to_num[node.path] = seq
|
|
uclass.alias_num_to_node[seq] = node
|
|
return seq
|
|
return None
|