Switch to UV for Python

.github/workflows/lint.yml

@@ -25,6 +25,8 @@ jobs:
           Copyright (\d{4}(-\d{4})?\s)?(ETH Zurich and University of Bologna|lowRISC contributors).
         exclude_paths: |
           .dir-locals.el
+          .python-version
+          uv.lock
     -
       name: Check license string
       run: |
@@ -60,17 +62,13 @@ jobs:
       name: Checkout
       uses: actions/checkout@v7
     -
-      name: Install Python
-      uses: actions/setup-python@v5
+      name: Install uv
+      uses: astral-sh/setup-uv@v7
       with:
-        python-version: 3.12
-        cache: pip
-    -
-      name: Install Python requirements
-      run: pip install -r requirements.txt
+        enable-cache: true
     -
       name: Run Tcllint
-      run: tclint . --style-spaces-in-braces --style-line-length 100
+      run: uv run --locked --group lint tclint . --style-spaces-in-braces --style-line-length 100
 
   slang:
     runs-on: ubuntu-latest

.gitignore

@@ -1,3 +1,4 @@
 .bender/
 test/verilator/
 test/vsim/
+.venv/

.python-version

@@ -0,0 +1 @@
+3.12

pyproject.toml

@@ -0,0 +1,32 @@
+# Copyright 2026 ETH Zurich and University of Bologna.
+#
+# 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
+#
+#     http://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
+
+# This repository ships no Python code; this project exists only to pin the
+# Python tooling used by CI. Run the linters with `uv run --group lint <tool>`.
+
+[project]
+name = "clic"
+version = "0"
+description = "Tooling environment for the RISC-V CLIC hardware IP"
+requires-python = ">=3.12"
+dependencies = []
+
+[dependency-groups]
+lint = ["tclint==0.4.2"]
+
+[tool.uv]
+# Nothing here is importable or installable, so do not try to build a wheel.
+package = false