dtoc: Add support for building a dtoc PyPi package

Create the necessary files to build this new package.

This is needed for binman.

Move the main program into a function so that it can easily be called by
the PyPi-created script.

Signed-off-by: Simon Glass <sjg@chromium.org>

Makefile

@@ -2284,6 +2284,7 @@ _pip:
 	scripts/make_pip.sh u_boot_pylib ${PIP_ARGS}
 	scripts/make_pip.sh patman ${PIP_ARGS}
 	scripts/make_pip.sh buildman ${PIP_ARGS}
+	scripts/make_pip.sh dtoc ${PIP_ARGS}
 
 help:
 	@echo  'Cleaning targets:'

tools/dtoc/README.rst

+.. SPDX-License-Identifier: GPL-2.0+
+
+Devicetree-to-C generator
+=========================
+
+This is a Python program and associated utilities, which supports converting
+devicetree files into C code. It generates header files containing struct
+definitions, as well as C files containing the data. It does not require any
+modification of the devicetree files.
+
+Some high-level libraries are provided for working with devicetree. These may
+be useful in other projects.
+
+This package also includes some U-Boot-specific features, such as creating
+`struct udevice` and `struct uclass` entries for devicetree nodes.

tools/dtoc/pyproject.toml

+[build-system]
+requires = ["setuptools>=61.0"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "dtoc"
+version = "0.0.2"
+authors = [
+  { name="Simon Glass", email="sjg@chromium.org" },
+]
+dependencies = ["pylibfdt", "u_boot_pylib"]
+description = "Devicetree-to-C generator"
+readme = "README.rst"
+requires-python = ">=3.7"
+classifiers = [
+    "Programming Language :: Python :: 3",
+    "License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)",
+    "Operating System :: OS Independent",
+]
+
+[project.urls]
+"Homepage" = "https://u-boot.readthedocs.io/en/latest/develop/driver-model/of-plat.html"
+"Bug Tracker" = "https://source.denx.de/groups/u-boot/-/issues"
+
+[project.scripts]
+dtoc = "dtoc.main:run_dtoc"