diff --git a/.gitmodules b/.gitmodules
index 9c70debf8..5db77ecbb 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,3 +13,6 @@
 [submodule "hw/mcu/nxp/lpc_driver"]
 	path = hw/mcu/nxp/lpc_driver
 	url = https://github.com/hathach/lpc_driver.git
+[submodule "hw/mcu/st/st_driver"]
+	path = hw/mcu/st/st_driver
+	url = https://github.com/hathach/st_driver.git
diff --git a/hw/mcu/st/st_driver b/hw/mcu/st/st_driver
new file mode 160000
index 000000000..a5fef7cc2
--- /dev/null
+++ b/hw/mcu/st/st_driver
@@ -0,0 +1 @@
+Subproject commit a5fef7cc227b23057266b4d19429e47626270491