diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..8629be4
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,6 @@
+export OPENLANE_ROOT=$(direnv_layout_dir)/ttsetup/openlane
+export PDK_ROOT=$(direnv_layout_dir)/ttsetup/pdk
+export PDK=sky130A
+export OPENLANE_TAG=2024.04.22
+export OPENLANE_IMAGE_NAME=efabless/openlane:2024.04.22
+source $(direnv_layout_dir)/ttsetup/bin/activate
diff --git a/.gitignore b/.gitignore
index e62b85d..af40c8f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,5 @@ test/sim_build
 test/__pycache__/
 test/results.xml
 test/gate_level_netlist.v
+
+/.direnv
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..8796d5d
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "tt"]
+	path = tt
+	url = https://github.com/TinyTapeout/tt-support-tools.git
+	branch = tt07
diff --git a/tt b/tt
new file mode 160000
index 0000000..98e9482
--- /dev/null
+++ b/tt
@@ -0,0 +1 @@
+Subproject commit 98e9482354707b380236bc522574a48b09c15c8d