diff --git a/dts/bindings/flash_controller/nuvoton,npcx-fiu-nor.yaml b/dts/bindings/flash_controller/nuvoton,npcx-fiu-nor.yaml
index 86c8e57a362..48be99535c0 100644
--- a/dts/bindings/flash_controller/nuvoton,npcx-fiu-nor.yaml
+++ b/dts/bindings/flash_controller/nuvoton,npcx-fiu-nor.yaml
@@ -47,3 +47,17 @@ properties:
       - "NPCX_RD_MODE_NORMAL" # Direct read access by command code 03h
       - "NPCX_RD_MODE_FAST" # Direct read access by command code 0bh
       - "NPCX_RD_MODE_FAST_DUAL" # Direct read access by command code bbh
+  spi-dev-size:
+    type: string
+    description: |
+      Select the size of the address space allocated for SPI device. This affects
+      the address space for any direct flash access.
+    enum:
+      - "NPCX_SPI_DEV_SIZE_1M"
+      - "NPCX_SPI_DEV_SIZE_2M"
+      - "NPCX_SPI_DEV_SIZE_4M"
+      - "NPCX_SPI_DEV_SIZE_8M"
+      - "NPCX_SPI_DEV_SIZE_16M"
+      - "NPCX_SPI_DEV_SIZE_32M"
+      - "NPCX_SPI_DEV_SIZE_64M"
+      - "NPCX_SPI_DEV_SIZE_128M"
diff --git a/dts/bindings/flash_controller/nuvoton,npcx-fiu-qspi.yaml b/dts/bindings/flash_controller/nuvoton,npcx-fiu-qspi.yaml
index 3e8627faf23..23504268e1a 100644
--- a/dts/bindings/flash_controller/nuvoton,npcx-fiu-qspi.yaml
+++ b/dts/bindings/flash_controller/nuvoton,npcx-fiu-qspi.yaml
@@ -38,3 +38,7 @@ properties:
     type: boolean
     description: |
       Two external SPI devices are supported for Direct Read Access (DRA) on QSPI bus.
+  flash-dev-inv:
+    type: boolean
+    description: |
+      Inverse the device connected to the base address.