diff --git a/scripts/python-skywater-pdk/skywater_pdk/__init__.py b/scripts/python-skywater-pdk/skywater_pdk/__init__.py
new file mode 100644
index 0000000..b27a7d1
--- /dev/null
+++ b/scripts/python-skywater-pdk/skywater_pdk/__init__.py
@@ -0,0 +1,17 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright 2020 SkyWater PDK Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
diff --git a/scripts/python-skywater-pdk/skywater_pdk/base.py b/scripts/python-skywater-pdk/skywater_pdk/base.py
new file mode 100644
index 0000000..ec4864b
--- /dev/null
+++ b/scripts/python-skywater-pdk/skywater_pdk/base.py
@@ -0,0 +1,506 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Copyright 2020 SkyWater PDK Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+import os
+
+from dataclasses import dataclass
+from dataclasses_json import dataclass_json
+from enum import Enum
+from typing import Optional, Union, Tuple
+
+from .utils import comparable_to_none
+from .utils import dataclass_json_passthru_config as dj_pass_cfg
+
+
+LibraryOrCell = Union['Library', 'Cell']
+
+
+def parse_pathname(pathname):
+    """Extract library and module name for pathname.
+
+    Returns
+    -------
+    obj : Library or Cell
+        Library or Cell information parsed from filename
+    filename : str, optional
+        String containing any filename extracted.
+        String containing the file extension
+
+    >>> parse_pathname('skywater-pdk/libraries/sky130_fd_sc_hd/v0.0.1/cells/a2111o')
+    (Cell(name='a2111o', library=Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.sc, name='hd', version=LibraryVersion(milestone=0, major=0, minor=1, commits=0, hash=''))), None)
+
+    >>> parse_pathname('skywater-pdk/libraries/sky130_fd_sc_hd/v0.0.1/cells/a2111o/README.rst')
+    (Cell(name='a2111o', library=Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.sc, name='hd', version=LibraryVersion(milestone=0, major=0, minor=1, commits=0, hash=''))), 'README.rst')
+
+    >>> parse_pathname('skywater-pdk/libraries/sky130_fd_sc_hd/v0.0.1')
+    (Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.sc, name='hd', version=LibraryVersion(milestone=0, major=0, minor=1, commits=0, hash='')), None)
+
+    >>> parse_pathname('skywater-pdk/libraries/sky130_fd_sc_hd/v0.0.1/README.rst')
+    (Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.sc, name='hd', version=LibraryVersion(milestone=0, major=0, minor=1, commits=0, hash='')), 'README.rst')
+
+    >>> parse_pathname('libraries/sky130_fd_sc_hd/v0.0.1')
+    (Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.sc, name='hd', version=LibraryVersion(milestone=0, major=0, minor=1, commits=0, hash='')), None)
+
+    >>> parse_pathname('libraries/sky130_fd_sc_hd/v0.0.1/README.rst')
+    (Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.sc, name='hd', version=LibraryVersion(milestone=0, major=0, minor=1, commits=0, hash='')), 'README.rst')
+
+    >>> parse_pathname('sky130_fd_sc_hd/v0.0.1')
+    (Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.sc, name='hd', version=LibraryVersion(milestone=0, major=0, minor=1, commits=0, hash='')), None)
+
+    >>> parse_pathname('sky130_fd_sc_hd/v0.0.1/README.rst')
+    (Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.sc, name='hd', version=LibraryVersion(milestone=0, major=0, minor=1, commits=0, hash='')), 'README.rst')
+
+    >>> parse_pathname('sky130_fd_sc_hd/v0.0.1/RANDOM')
+    (Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.sc, name='hd', version=LibraryVersion(milestone=0, major=0, minor=1, commits=0, hash='')), 'RANDOM')
+
+    >>> parse_pathname('RANDOM') #doctest: +ELLIPSIS
+    Traceback (most recent call last):
+        ...
+    ValueError: ...
+
+    >>> parse_pathname('libraries/RANDOM/v0.0.1') #doctest: +ELLIPSIS
+    Traceback (most recent call last):
+        ...
+    ValueError: ...
+
+    >>> parse_pathname('libraries/skywater_fd_sc_hd/vA.B.C') #doctest: +ELLIPSIS
+    Traceback (most recent call last):
+        ...
+    ValueError: ...
+    """
+    if os.path.exists(pathname):
+        pathname = os.path.abspath(pathname)
+
+    pathbits = pathname.split(os.path.sep)
+    # Remove any files at the end of the path
+    filename = None
+    if '.' in pathbits[-1]:
+        if not pathbits[-1].startswith('v'):
+            filename = pathbits.pop(-1)
+
+    obj_type = None
+    obj_name = None
+
+    lib_name = None
+    lib_version = None
+
+    while len(pathbits) > 1:
+        n1 = pathbits[-1]
+        n2 = pathbits[-2]
+        if len(pathbits) > 2:
+            n3 = pathbits[-3]
+        else:
+            n3 = ''
+
+        # [..., 'cells', <cellname>]
+        # [..., 'models', <modname>]
+        if n2 in ('cells', 'models'):
+            obj_name = pathbits.pop(-1)
+            obj_type = pathbits.pop(-1)
+            continue
+        # [..., 'skywater-pdk', 'libraries', <library name>, <library version>]
+        elif n3 == "libraries":
+            lib_version = pathbits.pop(-1)
+            lib_name = pathbits.pop(-1)
+            assert pathbits.pop(-1) == 'libraries'
+        # [..., 'skywater-pdk', 'libraries', <library name>]
+        elif n2 == "libraries":
+            lib_name = pathbits.pop(-1)
+            assert pathbits.pop(-1) == 'libraries'
+        # [<library name>, <library version>]
+        elif n1.startswith('v'):
+            lib_version = pathbits.pop(-1)
+            lib_name = pathbits.pop(-1)
+        elif filename is None:
+            filename = pathbits.pop(-1)
+            continue
+        else:
+            raise ValueError('Unable to parse: {}'.format(pathname))
+        break
+
+    if not lib_name:
+        raise ValueError('Unable to parse: {}'.format(pathname))
+    lib = Library.parse(lib_name)
+    if lib_version:
+        lib.version = LibraryVersion.parse(lib_version)
+    if obj_name:
+        obj = Cell.parse(obj_name)
+        obj.library = lib
+        return obj, filename
+    else:
+        return lib, filename
+
+
+
+def parse_filename(pathname) -> Tuple[LibraryOrCell, Optional[str], Optional[str]]:
+    """Extract library and module name from filename.
+
+    Returns
+    -------
+    obj : Library or Cell
+        Library or Cell information parsed from filename
+    extra : str, optional
+        String containing any extra unparsed data (like corner information)
+    ext : str, optional
+        String containing the file extension
+
+    >>> t = list(parse_filename('sky130_fd_io__top_ground_padonlyv2__tt_1p80V_3p30V_3p30V_25C.wrap.lib'))
+    >>> t.pop(0)
+    Cell(name='top_ground_padonlyv2', library=Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.io, name='', version=None))
+    >>> t.pop(0)
+    'tt_1p80V_3p30V_3p30V_25C'
+    >>> t.pop(0)
+    'wrap.lib'
+    >>> t = list(parse_filename('v0.10.0/sky130_fd_sc_hdll__a211o__tt_1p80V_3p30V_3p30V_25C.wrap.json'))
+    >>> t.pop(0)
+    Cell(name='a211o', library=Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.sc, name='hdll', version=LibraryVersion(milestone=0, major=10, minor=0, commits=0, hash='')))
+    >>> t.pop(0)
+    'tt_1p80V_3p30V_3p30V_25C'
+    >>> t.pop(0)
+    'wrap.json'
+
+    >>> t = list(parse_filename('sky130_fd_io/v0.1.0/sky130_fd_io__top_powerhv_hvc_wpad__tt_1p80V_3p30V_100C.wrap.json'))
+    >>> t.pop(0)
+    Cell(name='top_powerhv_hvc_wpad', library=Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.io, name='', version=LibraryVersion(milestone=0, major=1, minor=0, commits=0, hash='')))
+    >>> from skywater_pdk.corners import parse_filename as pf_corners
+    >>> pf_corners(t.pop(0))
+    (Corner(corner=(CornerType.t, CornerType.t), volts=(1.8, 3.3), temps=(100,), flags=None), [])
+    >>> t.pop(0)
+    'wrap.json'
+
+    >>> parse_filename('libraries/sky130_fd_io/v0.2.1/cells/analog_pad/sky130_fd_io-analog_pad.blackbox.v')[0]
+    Cell(name='analog_pad', library=Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.io, name='', version=LibraryVersion(milestone=0, major=2, minor=1, commits=0, hash='')))
+
+    >>> t = list(parse_filename('skywater-pdk/libraries/sky130_fd_sc_hd/v0.0.1/cells/a2111o/sky130_fd_sc_hd__a2111o.blackbox.v'))
+    >>> t.pop(0)
+    Cell(name='a2111o', library=Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.sc, name='hd', version=LibraryVersion(milestone=0, major=0, minor=1, commits=0, hash='')))
+    >>> assert t.pop(0) is None
+    >>> t.pop(0)
+    'blackbox.v'
+
+    """
+    dirname, filename = os.path.split(pathname)
+
+    # Extract a version if it exists.
+    dirbase, dirversion = os.path.split(dirname)
+    if dirbase.endswith('cells'):
+        dirbase, dirversion = os.path.split(dirbase)
+        assert dirversion == 'cells', (dirbase, dirversion)
+        dirbase, dirversion = os.path.split(dirbase)
+    try:
+        version = LibraryVersion.parse(dirversion)
+    except TypeError:
+        version = None
+
+    # Extract the file extension
+    if '.' in filename:
+        basename, extension = filename.split('.', 1)
+    else:
+        basename = filename
+        extension = ''
+
+    basename = basename.replace('-', SEPERATOR) # FIXME: !!!
+
+    # Parse the actual filename
+    bits = basename.split(SEPERATOR, 3)
+    if len(bits) in (1,):
+        library = Library.parse(bits.pop(0))
+        extra = ""
+        if bits:
+            extra = bits.pop(0)
+        if version:
+            library.version = version
+    elif len(bits) in (2, 3):
+        library = Cell.parse(bits[0]+SEPERATOR+bits[1])
+        if version:
+            library.library.version = version
+        extra = None
+        if len(bits) > 2:
+            extra = bits[2]
+    else:
+        raise NotImplementedError()
+
+    return (library, extra, extension)
+
+
+SEPERATOR = "__"
+
+@comparable_to_none
+@dataclass_json
+@dataclass(order=True, frozen=True)
+class LibraryVersion:
+    """
+
+    >>> v0 = LibraryVersion.parse("v0.0.0")
+    >>> v0
+    LibraryVersion(milestone=0, major=0, minor=0, commits=0, hash='')
+    >>> v1a = LibraryVersion.parse("v0.0.0-10-g123abc")
+    >>> v1a
+    LibraryVersion(milestone=0, major=0, minor=0, commits=10, hash='123abc')
+    >>> v1b = LibraryVersion.parse("v0.0.0-4-g123abc")
+    >>> v1b
+    LibraryVersion(milestone=0, major=0, minor=0, commits=4, hash='123abc')
+    >>> v2 = LibraryVersion.parse("v0.0.2")
+    >>> v2
+    LibraryVersion(milestone=0, major=0, minor=2, commits=0, hash='')
+    >>> v3 = LibraryVersion.parse("v0.2.0")
+    >>> v3
+    LibraryVersion(milestone=0, major=2, minor=0, commits=0, hash='')
+    >>> v4 = LibraryVersion.parse("v0.0.10")
+    >>> v4
+    LibraryVersion(milestone=0, major=0, minor=10, commits=0, hash='')
+    >>> v0 < v1a
+    True
+    >>> v1a < v2
+    True
+    >>> v0 < v2
+    True
+    >>> l = [v1a, v2, v3, None, v1b, v0, v2]
+    >>> l.sort()
+    >>> [i.fullname for i in l]
+    ['0.0.0', '0.0.0-4-g123abc', '0.0.0-10-g123abc', '0.0.2', '0.0.2', '0.2.0']
+    """
+    milestone: int = 0
+    major: int = 0
+    minor: int = 0
+
+    commits: int = 0
+    hash: str = ''
+
+    @classmethod
+    def parse(cls, s):
+        if not s.startswith('v'):
+            raise TypeError("Unknown version: {}".format(s))
+        kw = {}
+        if '-' in s:
+            git_bits = s.split('-')
+            if len(git_bits) != 3:
+                raise TypeError("Unparsable git version: {}".format(s))
+            s = git_bits[0]
+            kw['commits'] = int(git_bits[1])
+            assert git_bits[2].startswith('g'), git_bits[2]
+            kw['hash'] = git_bits[2][1:]
+        kw['milestone'], kw['major'], kw['minor'] = (
+            int(i) for i in s[1:].split('.'))
+        return cls(**kw)
+
+    def as_tuple(self):
+        return (self.milestone, self.major, self.minor, self.commits, minor)
+
+    @property
+    def fullname(self):
+        o = []
+        s = "{}.{}.{}".format(
+            self.milestone, self.major, self.minor)
+        if self.commits:
+            s += "-{}-g{}".format(self.commits, self.hash)
+        return s
+
+
+class LibraryNode(Enum):
+    SKY130 = "SkyWater 130nm"
+
+    @classmethod
+    def parse(cls, s):
+        s = s.upper()
+        if not hasattr(cls, s):
+            raise ValueError("Unknown node: {}".format(s))
+        return getattr(cls, s)
+
+    def __repr__(self):
+        return "LibraryNode."+self.name
+
+    def to_json(self):
+        return self.name
+
+
+class LibrarySource(str):
+    """Where a library was created."""
+    Known = []
+
+    @classmethod
+    def parse(cls, s):
+        try:
+            return cls.Known[cls.Known.index(s)]
+        except ValueError:
+            return cls(s)
+
+    @property
+    def fullname(self):
+        if self in self.Known:
+            return self.__doc__
+        else:
+            return 'Unknown source: '+str.__repr__(self)
+
+    def __repr__(self):
+        return 'LibrarySource({})'.format(str.__repr__(self))
+
+    def to_json(self):
+        if self in self.Known:
+            return self.__doc__
+        return str.__repr__(self)
+
+
+Foundary = LibrarySource("fd")
+Foundary.__doc__ = "The SkyWater Foundary"
+LibrarySource.Known.append(Foundary)
+
+Efabless = LibrarySource("ef")
+Efabless.__doc__ = "Efabless"
+LibrarySource.Known.append(Efabless)
+
+OSU = LibrarySource("osu")
+OSU.__doc__ = "Oklahoma State University"
+LibrarySource.Known.append(OSU)
+
+
+class LibraryType(Enum):
+    pr = "Primitives"
+    sc = "Standard Cells"
+    sp = "Build Space (Flash, SRAM, etc)"
+    io = "IO and Periphery"
+    xx = "Miscellaneous"
+
+    @classmethod
+    def parse(cls, s):
+        if not hasattr(cls, s):
+            raise ValueError("Unknown library type: {}".format(s))
+        return getattr(cls, s)
+
+    def __repr__(self):
+        return "LibraryType."+self.name
+
+    def __str__(self):
+        return self.value
+
+    def to_json(self):
+        return self.value
+
+
+@comparable_to_none
+@dataclass_json
+@dataclass
+class Library:
+    """
+
+    >>> l = Library.parse("sky130_fd_sc_hd")
+    >>> l
+    Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.sc, name='hd', version=None)
+    >>> l.fullname
+    'sky130_fd_sc_hd'
+    >>> l.source.fullname
+    'The SkyWater Foundary'
+    >>> print(l.type)
+    Standard Cells
+
+    >>> l = Library.parse("sky130_rrr_sc_hd")
+    >>> l
+    Library(node=LibraryNode.SKY130, source=LibrarySource('rrr'), type=LibraryType.sc, name='hd', version=None)
+    >>> l.fullname
+    'sky130_rrr_sc_hd'
+    >>> l.source.fullname
+    "Unknown source: 'rrr'"
+
+    >>> l1 = Library.parse("sky130_fd_sc_hd")
+    >>> l2 = Library.parse("sky130_fd_sc_hdll")
+    >>> l = [l2, None, l1]
+    >>> l.sort()
+
+    """
+
+    node: LibraryNode = dj_pass_cfg()
+    source: LibrarySource = dj_pass_cfg()
+    type: LibraryType = dj_pass_cfg()
+    name: str = ''
+    version: Optional[LibraryVersion] = None
+
+    @property
+    def fullname(self):
+        output = []
+        output.append(self.node.name.lower())
+        output.append(self.source.lower())
+        output.append(self.type.name)
+        if self.name:
+            output.append(self.name)
+        return "_".join(output)
+
+    @classmethod
+    def parse(cls, s):
+        if SEPERATOR in s:
+            raise ValueError(
+                "Found separator '__' in library name: {!r}".format(s))
+
+        bits = s.split("_")
+        if len(bits) < 3:
+            raise ValueError(
+                "Did not find enough parts in library name: {}".format(bits))
+
+        kw = {}
+        kw['node'] = LibraryNode.parse(bits.pop(0))
+        kw['source'] = LibrarySource.parse(bits.pop(0))
+        kw['type'] = LibraryType.parse(bits.pop(0))
+        if bits:
+            kw['name'] = bits.pop(0)
+        return cls(**kw)
+
+
+@dataclass_json
+@dataclass
+class Cell:
+    """
+    >>> c = Cell.parse("sky130_fd_sc_hd__abc")
+    >>> c
+    Cell(name='abc', library=Library(node=LibraryNode.SKY130, source=LibrarySource('fd'), type=LibraryType.sc, name='hd', version=None))
+    >>> c.fullname
+    'sky130_fd_sc_hd__abc'
+
+    >>> c = Cell.parse("abc")
+    >>> c
+    Cell(name='abc', library=None)
+    >>> c.fullname
+    Traceback (most recent call last):
+        ...
+    ValueError: Can't get fullname for cell without a library! Cell(name='abc', library=None)
+    """
+
+    name: str
+    library: Optional[Library] = None
+
+    @property
+    def fullname(self):
+        if not self.library:
+            raise ValueError(
+                "Can't get fullname for cell without a library! {}".format(
+                    self))
+        return "{}__{}".format(self.library.fullname, self.name)
+
+    @classmethod
+    def parse(cls, s):
+        kw = {}
+        if SEPERATOR in s:
+            library, s = s.split(SEPERATOR, 1)
+            kw['library'] = Library.parse(library)
+        kw['name'] = s
+        return cls(**kw)
+
+
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod()
diff --git a/scripts/python-skywater-pdk/skywater_pdk/sizes.py b/scripts/python-skywater-pdk/skywater_pdk/sizes.py
new file mode 100644
index 0000000..637babd
--- /dev/null
+++ b/scripts/python-skywater-pdk/skywater_pdk/sizes.py
@@ -0,0 +1,325 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Copyright 2020 SkyWater PDK Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+import abc
+import os
+import operator
+
+from dataclasses import dataclass
+from dataclasses_json import dataclass_json
+
+
+def parse_size(s):
+    """
+
+    >>> parse_size('_1')
+    CellSizeNumeric(units=1)
+
+    >>> parse_size('sky130_fd_sc_ms__sdfrtp_1.v')
+    CellSizeNumeric(units=1)
+
+    >>> parse_size('libraries/sky130_fd_sc_ms/v0.0.1/cells/sdfrtp/sky130_fd_sc_ms__sdfrtp_1.v')
+    CellSizeNumeric(units=1)
+
+    >>> parse_size('libraries/sky130_fd_sc_ms/v0.0.1/cells/sdfrtp/sky130_fd_sc_ms__sdfrtp_1.bb.blackbox.v')
+    CellSizeNumeric(units=1)
+
+    >>> parse_size('libraries/sky130_fd_sc_ms/v0.0.1/cells/sdfrtp/sky130_fd_sc_ms__sdfrtp.v')
+    >>> parse_size('sky130_fd_sc_ms__sdfrtp.v')
+    >>> parse_size('_blah')
+    """
+    dirname, s = os.path.split(s)
+    if '.' in s:
+        s = s.split('.', 1)[0]
+    if s.count('_') > 1:
+        s = '_' + (s.rsplit('_', 1)[-1])
+    if not s or s == '_':
+        return None
+    try:
+        return CellSize.from_suffix(s)
+    except InvalidSuffixError as e:
+        return None
+
+
+class InvalidSuffixError(ValueError):
+    def __init__(self, s):
+        ValueError.__init__(self, "Invalid suffix: {}".format(s.strip()))
+
+
+class CellSize(abc.ABC):
+    """Drive strength variants of a given cell.
+
+    >>> d1 = CellSize.from_suffix("_1")
+    >>> d2 = CellSize.from_suffix("_lp")
+    >>> d3 = CellSize.from_suffix("_m")
+    >>> d4 = CellSize.from_suffix("_2")
+    >>> CellSize.from_suffix("_abc")
+    Traceback (most recent call last):
+        ...
+    InvalidSuffixError: Invalid suffix: _abc
+    >>> l = [d1, d2, d3, d4]
+    >>> l
+    [CellSizeNumeric(units=1), CellSizeLowPower(lp_variant=0), CellSizeMinimum(), CellSizeNumeric(units=2)]
+    >>> l.sort()
+    >>> l
+    [CellSizeNumeric(units=1), CellSizeNumeric(units=2), CellSizeLowPower(lp_variant=0), CellSizeMinimum()]
+    """
+
+    @abc.abstractmethod
+    def describe(self):
+        raise NotImplementedError
+
+    @property
+    @abc.abstractmethod
+    def suffix(self):
+        raise NotImplementedError
+
+    @classmethod
+    def from_suffix(cls, s):
+        errors = []
+        for subcls in cls.__subclasses__():
+            try:
+                return subcls.from_suffix(s)
+            except (ValueError, AssertionError) as e:
+                errors.append((subcls.__name__, e))
+        assert errors, ("Unknown error!?", s)
+        msg = [s, '']
+        for cls_name, e in errors:
+            if isinstance(e, ValueError):
+                continue
+            msg.append("{} failed with: {}".format(cls_name, e))
+        raise InvalidSuffixError("\n".join(msg))
+
+    def __str__(self):
+        return "with size {}".format(self.describe())
+
+    def _cmp(self, op, o):
+        if not isinstance(o, CellSize):
+            return False
+        return op(self.suffix, o.suffix)
+
+    # Comparison operators
+    def __lt__(self, o):
+        return self._cmp(operator.lt, o)
+
+    def __le__(self, o):
+        return self._cmp(operator.le, o)
+
+    def __eq__(self, o):
+        return self._cmp(operator.eq, o)
+
+    def __ne__(self, o):
+        return self._cmp(operator.ne, o)
+
+    def __ge__(self, o):
+        return self._cmp(operator.ge, o)
+
+    def __gt__(self, o):
+        return self._cmp(operator.gt, o)
+
+
+@dataclass_json
+@dataclass(frozen=True)
+class CellSizeNumeric(CellSize):
+    """
+    >>> s1 = CellSizeNumeric.from_suffix("_1")
+    >>> s2 = CellSizeNumeric.from_suffix("_2")
+    >>> s3 = CellSizeNumeric.from_suffix("_3")
+    >>> CellSizeNumeric.from_suffix("_-1")
+    Traceback (most recent call last):
+        ...
+    InvalidSuffixError: Invalid suffix: _-1
+    >>> s1
+    CellSizeNumeric(units=1)
+    >>> s2
+    CellSizeNumeric(units=2)
+    >>> s3
+    CellSizeNumeric(units=3)
+    >>> str(s1)
+    'with size of 1 units'
+    >>> str(s2)
+    'with size of 2 units'
+    >>> str(s3)
+    'with size of 3 units (invalid?)'
+    >>> s1.describe()
+    'of 1 units'
+    >>> s2.describe()
+    'of 2 units'
+    >>> s3.describe()
+    'of 3 units (invalid?)'
+    >>> s1.suffix
+    '_1'
+    >>> s2.suffix
+    '_2'
+    >>> s3.suffix
+    '_3'
+    """
+    units: int
+
+    VALID_UNIT_VALUES = (0, 1, 2, 4, 8, 6, 12, 14, 16, 20, 32)
+
+    def describe(self):
+        suffix = ""
+        if self.units not in self.VALID_UNIT_VALUES:
+            suffix = " (invalid?)"
+
+        return "of {} units{}".format(self.units, suffix)
+
+    @property
+    def suffix(self):
+        return "_{}".format(self.units)
+
+    @classmethod
+    def from_suffix(cls, s):
+        if not s.startswith("_"):
+            raise InvalidSuffixError(s)
+        i = int(s[1:])
+        if i < 0:
+            raise InvalidSuffixError(s)
+        return cls(i)
+
+
+@dataclass_json
+@dataclass(frozen=True)
+class CellSizeLowPower(CellSize):
+    """
+    >>> lp = CellSizeLowPower.from_suffix("_lp")
+    >>> lp2 = CellSizeLowPower.from_suffix("_lp2")
+    >>> lp3 = CellSizeLowPower.from_suffix("_lp3")
+    >>> CellSizeLowPower.from_suffix("_ld")
+    Traceback (most recent call last):
+        ...
+    InvalidSuffixError: Invalid suffix: _ld
+    >>> lp
+    CellSizeLowPower(lp_variant=0)
+    >>> lp2
+    CellSizeLowPower(lp_variant=1)
+    >>> lp3
+    CellSizeLowPower(lp_variant=2)
+    >>> str(lp)
+    'with size for low power'
+    >>> str(lp2)
+    'with size for low power (alternative)'
+    >>> str(lp3)
+    'with size for low power (extra alternative 0)'
+    >>> lp.describe()
+    'for low power'
+    >>> lp2.describe()
+    'for low power (alternative)'
+    >>> lp3.describe()
+    'for low power (extra alternative 0)'
+    >>> lp.suffix
+    '_lp'
+    >>> lp2.suffix
+    '_lp2'
+    >>> lp3.suffix
+    '_lp3'
+    """
+    lp_variant: int = 0
+
+    def describe(self):
+        if self.lp_variant == 0:
+            suffix = ""
+        elif self.lp_variant == 1:
+            suffix = " (alternative)"
+        else:
+            assert self.lp_variant >= 2, self.lp_variant
+            suffix = " (extra alternative {})".format(self.lp_variant-2)
+        return "for low power"+suffix
+
+    @property
+    def suffix(self):
+        if self.lp_variant == 0:
+            return "_lp"
+        else:
+            assert self.lp_variant > 0, self.lp_variant
+            return "_lp{}".format(self.lp_variant+1)
+
+    @classmethod
+    def from_suffix(cls, s):
+        if not s.startswith("_lp"):
+            raise InvalidSuffixError(s)
+        if s == "_lp":
+            return cls()
+        elif s == "_lp2":
+            return cls(1)
+        else:
+            try:
+                i = int(s[3:])
+            except ValueError as e:
+                raise InvalidSuffixError(s)
+            assert i > 2, (s, i)
+            return cls(i-1)
+
+
+class CellSizeMinimum(CellSize):
+    """
+    >>> m = CellSizeMinimum.from_suffix("_m")
+    >>> CellSizeMinimum.from_suffix("_m2")
+    Traceback (most recent call last):
+        ...
+    InvalidSuffixError: Invalid suffix: _m2
+    >>> m
+    CellSizeMinimum()
+    >>> str(m)
+    'with size minimum'
+    >>> m.describe()
+    'minimum'
+    >>> m.suffix
+    '_m'
+
+    >>> m1 = CellSizeMinimum()
+    >>> m2 = CellSizeMinimum()
+    >>> assert m1 is m2
+    """
+    _object = None
+    def __new__(cls):
+        if cls._object is None:
+            cls._object = object.__new__(cls)
+        return cls._object
+
+    def __repr__(self):
+        return "CellSizeMinimum()"
+
+    def describe(self):
+        return "minimum"
+
+    @property
+    def suffix(self):
+        return "_m"
+
+    @classmethod
+    def from_suffix(cls, s):
+        if s != "_m":
+            raise InvalidSuffixError(s)
+        return cls()
+
+    def __hash__(self):
+        return id(self)
+
+    def to_dict(self):
+        return {'minimum': None}
+
+
+CellSizeMinimum._object = CellSizeMinimum()
+
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod()
diff --git a/scripts/python-skywater-pdk/skywater_pdk/utils.py b/scripts/python-skywater-pdk/skywater_pdk/utils.py
new file mode 100644
index 0000000..d0b284a
--- /dev/null
+++ b/scripts/python-skywater-pdk/skywater_pdk/utils.py
@@ -0,0 +1,213 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Copyright 2020 SkyWater PDK Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+import dataclasses
+import dataclasses_json
+import random
+import sys
+
+from dataclasses import dataclass
+from dataclasses_json import dataclass_json
+from enum import Flag
+from typing import Optional, Tuple, Any
+
+
+def dataclass_json_passthru_config(*args, **kw):
+    return dataclasses.field(
+        *args,
+        metadata=dataclasses_json.config(
+            encoder=lambda x: x.to_json(),
+            #decoder=lambda x: x.from_json(),
+        ),
+        **kw,
+    )
+
+def dataclass_json_passthru_sequence_config(*args, **kw):
+    def to_json_sequence(s):
+        if s is None:
+            return None
+        o = []
+        for i in s:
+            if hasattr(i, 'to_json'):
+                o.append(i.to_json())
+            else:
+                o.append(i)
+        return o
+
+    return dataclasses.field(
+        *args,
+        metadata=dataclasses_json.config(
+            encoder=to_json_sequence,
+            #decoder=lambda x: x.from_json(),
+        ),
+        **kw,
+    )
+
+
+
+def comparable_to_none(cls):
+    """
+
+    >>> @comparable_to_none
+    ... @dataclass(order=True)
+    ... class A:
+    ...     a: int = 0
+    >>> @comparable_to_none
+    ... @dataclass(order=True)
+    ... class B:
+    ...     b: Optional[A] = None
+    >>> b0 = B()
+    >>> repr(b0)
+    'B(b=None)'
+    >>> str(b0)
+    'B(b=None)'
+    >>> b1 = B(A())
+    >>> repr(b1)
+    'B(b=A(a=0))'
+    >>> str(b1)
+    'B(b=A(a=0))'
+    >>> b2 = B(A(2))
+    >>> repr(b2)
+    'B(b=A(a=2))'
+    >>> str(b2)
+    'B(b=A(a=2))'
+    >>> l = [b0, b1, b2, None]
+    >>> for i in range(0, 3):
+    ...     random.shuffle(l)
+    ...     l.sort()
+    ...     print(l)
+    [None, B(b=None), B(b=A(a=0)), B(b=A(a=2))]
+    [None, B(b=None), B(b=A(a=0)), B(b=A(a=2))]
+    [None, B(b=None), B(b=A(a=0)), B(b=A(a=2))]
+
+    """
+    class ComparableToNoneVersion(cls):
+        def __ge__(self, other):
+            if other is None:
+                return True
+            return super().__ge__(other)
+        def __gt__(self, other):
+            if other is None:
+                return True
+            return super().__gt__(other)
+        def __le__(self, other):
+            if other is None:
+                return False
+            return super().__le__(other)
+        def __lt__(self, other):
+            if other is None:
+                return False
+            return super().__lt__(other)
+        def __eq__(self, other):
+            if other is None:
+                return False
+            return super().__eq__(other)
+        def __hash__(self):
+            return super().__hash__()
+        def __repr__(self):
+            s = super().__repr__()
+            return s.replace('comparable_to_none.<locals>.ComparableToNoneVersion', cls.__name__)
+
+    return ComparableToNoneVersion
+
+
+def _is_optional_type(t):
+    """
+    >>> _is_optional_type(Optional[int])
+    True
+    >>> _is_optional_type(Optional[Tuple])
+    True
+    >>> _is_optional_type(Any)
+    False
+    """
+    return hasattr(t, "__args__") and len(t.__args__) == 2 and t.__args__[-1] is type(None)
+
+
+def _get_the_optional_type(t):
+    """
+    >>> _get_the_optional_type(Optional[int])
+    <class 'int'>
+    >>> _get_the_optional_type(Optional[Tuple])
+    typing.Tuple
+    >>> class A:
+    ...     pass
+    >>> _get_the_optional_type(Optional[A])
+    <class '__main__.A'>
+    >>> _get_type_name(_get_the_optional_type(Optional[A]))
+    'A'
+    """
+    assert _is_optional_type(t), t
+    return t.__args__[0]
+
+
+def _get_type_name(ot):
+    """
+    >>> _get_type_name(int)
+    'int'
+    >>> _get_type_name(Tuple)
+    'Tuple'
+    >>> _get_type_name(Optional[Tuple])
+    'typing.Union[typing.Tuple, NoneType]'
+    """
+    if hasattr(ot, "_name") and ot._name:
+        return ot._name
+    elif hasattr(ot, "__name__") and ot.__name__:
+        return ot.__name__
+    else:
+        return str(ot)
+
+
+class OrderedFlag(Flag):
+    def __ge__(self, other):
+        if other is None:
+            return True
+        if self.__class__ is other.__class__:
+            return self.value >= other.value
+        return NotImplemented
+    def __gt__(self, other):
+        if other is None:
+            return True
+        if self.__class__ is other.__class__:
+            return self.value > other.value
+        return NotImplemented
+    def __le__(self, other):
+        if other is None:
+            return False
+        if self.__class__ is other.__class__:
+            return self.value <= other.value
+        return NotImplemented
+    def __lt__(self, other):
+        if other is None:
+            return False
+        if self.__class__ is other.__class__:
+            return self.value < other.value
+        return NotImplemented
+    def __eq__(self, other):
+        if other is None:
+            return False
+        if self.__class__ is other.__class__:
+            return self.value == other.value
+        return NotImplemented
+    def __hash__(self):
+        return hash(self._name_)
+
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod()