diff --git a/drivers/flash/flash_sam0.c b/drivers/flash/flash_sam0.c
index 1fb974bbbbf..4cfc2e5db36 100644
--- a/drivers/flash/flash_sam0.c
+++ b/drivers/flash/flash_sam0.c
@@ -30,7 +30,7 @@ LOG_MODULE_REGISTER(flash_sam0);
  * Number of lock regions.  The number is fixed and the region size
  * grows with the flash size.
  */
-#define LOCK_REGIONS 16
+#define LOCK_REGIONS DT_ATMEL_SAM0_NVMCTRL_0_LOCK_REGIONS
 #define LOCK_REGION_SIZE (FLASH_SIZE / LOCK_REGIONS)
 
 #if defined(NVMCTRL_BLOCK_SIZE)
diff --git a/dts/arm/atmel/samd.dtsi b/dts/arm/atmel/samd.dtsi
index cb28d57a52f..8b537304bc4 100644
--- a/dts/arm/atmel/samd.dtsi
+++ b/dts/arm/atmel/samd.dtsi
@@ -60,6 +60,7 @@
 			label = "FLASH_CTRL";
 			reg = <0x41004000 0x22>;
 			interrupts = <5 0>;
+			lock-regions = <16>;
 
 			#address-cells = <1>;
 			#size-cells = <1>;
diff --git a/dts/bindings/flash_controller/atmel,sam0-nvmctrl.yaml b/dts/bindings/flash_controller/atmel,sam0-nvmctrl.yaml
index 5c3887b0752..9e24ddadd57 100644
--- a/dts/bindings/flash_controller/atmel,sam0-nvmctrl.yaml
+++ b/dts/bindings/flash_controller/atmel,sam0-nvmctrl.yaml
@@ -3,3 +3,9 @@ description: Atmel SAM0 NVMC (Non-Volatile Memory Controller)
 compatible: "atmel,sam0-nvmctrl"
 
 include: flash-controller.yaml
+
+properties:
+    lock-regions:
+      type: int
+      required: true
+      description: Number of lock regions