diff --git a/data/registers/gpio_v1.yaml b/data/registers/gpio_v1.yaml
index d0d2cb7..d6ce404 100644
--- a/data/registers/gpio_v1.yaml
+++ b/data/registers/gpio_v1.yaml
@@ -106,12 +106,10 @@ fieldset/LCKR:
     array:
       len: 16
       stride: 1
-    enum: LCK
   - name: LCKK
     description: Lock key
     bit_offset: 16
     bit_size: 1
-    enum: LCKK
 fieldset/ODR:
   description: Port output data register (GPIOn_ODR)
   fields:
@@ -159,24 +157,6 @@ enum/IDR:
   - name: High
     description: Input is logic high
     value: 1
-enum/LCK:
-  bit_size: 1
-  variants:
-  - name: Unlocked
-    description: Port configuration not locked
-    value: 0
-  - name: Locked
-    description: Port configuration locked
-    value: 1
-enum/LCKK:
-  bit_size: 1
-  variants:
-  - name: NotActive
-    description: Port configuration lock key not active
-    value: 0
-  - name: Active
-    description: Port configuration lock key active
-    value: 1
 enum/MODE:
   bit_size: 2
   variants:
diff --git a/data/registers/gpio_v2.yaml b/data/registers/gpio_v2.yaml
index fe773ee..c436ff3 100644
--- a/data/registers/gpio_v2.yaml
+++ b/data/registers/gpio_v2.yaml
@@ -90,12 +90,10 @@ fieldset/LCKR:
     array:
       len: 16
       stride: 1
-    enum: LCK
   - name: LCKK
     description: Port x lock bit y (y= 0..15)
     bit_offset: 16
     bit_size: 1
-    enum: LCKK
 fieldset/MODER:
   description: GPIO port mode register
   fields:
@@ -160,24 +158,6 @@ enum/IDR:
   - name: High
     description: Input is logic high
     value: 1
-enum/LCK:
-  bit_size: 1
-  variants:
-  - name: Unlocked
-    description: Port configuration not locked
-    value: 0
-  - name: Locked
-    description: Port configuration locked
-    value: 1
-enum/LCKK:
-  bit_size: 1
-  variants:
-  - name: NotActive
-    description: Port configuration lock key not active
-    value: 0
-  - name: Active
-    description: Port configuration lock key active
-    value: 1
 enum/MODER:
   bit_size: 2
   variants:
diff --git a/transforms/GPIO.yaml b/transforms/GPIO.yaml
new file mode 100644
index 0000000..bfff1f2
--- /dev/null
+++ b/transforms/GPIO.yaml
@@ -0,0 +1,3 @@
+transforms:
+  - !DeleteEnums
+    from: ^(LCKK?)$