diff --git a/.gitmodules b/.gitmodules
index cb36ad4c4a..88d46f69df 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -111,3 +111,6 @@
 [submodule "ports/mimxrt10xx/sdk"]
 	path = ports/mimxrt10xx/sdk
 	url = https://github.com/adafruit/MIMXRT10xx_SDK
+[submodule "frozen/Adafruit_CircuitPython_Register"]
+	path = frozen/Adafruit_CircuitPython_Register
+	url = https://github.com/adafruit/Adafruit_CircuitPython_Register.git
diff --git a/frozen/Adafruit_CircuitPython_Register b/frozen/Adafruit_CircuitPython_Register
new file mode 160000
index 0000000000..c525eedeb0
--- /dev/null
+++ b/frozen/Adafruit_CircuitPython_Register
@@ -0,0 +1 @@
+Subproject commit c525eedeb0d20c9829febfbf621eab707da71f8a