diff --git a/boards/arm/adafruit_trinket_m0/pre_dt_board.cmake b/boards/arm/adafruit_trinket_m0/pre_dt_board.cmake
new file mode 100644
index 00000000000..94f7f4e4459
--- /dev/null
+++ b/boards/arm/adafruit_trinket_m0/pre_dt_board.cmake
@@ -0,0 +1,5 @@
+# Copyright (c) 2021 Linaro Limited
+# SPDX-License-Identifier: Apache-2.0
+
+# SPI is implemented via sercom so node name isn't spi@...
+list(APPEND EXTRA_DTC_FLAGS "-Wno-spi_bus_bridge")
diff --git a/boards/arm/arduino_nano_33_iot/pre_dt_board.cmake b/boards/arm/arduino_nano_33_iot/pre_dt_board.cmake
new file mode 100644
index 00000000000..94f7f4e4459
--- /dev/null
+++ b/boards/arm/arduino_nano_33_iot/pre_dt_board.cmake
@@ -0,0 +1,5 @@
+# Copyright (c) 2021 Linaro Limited
+# SPDX-License-Identifier: Apache-2.0
+
+# SPI is implemented via sercom so node name isn't spi@...
+list(APPEND EXTRA_DTC_FLAGS "-Wno-spi_bus_bridge")
diff --git a/boards/arm/atsamr21_xpro/pre_dt_board.cmake b/boards/arm/atsamr21_xpro/pre_dt_board.cmake
new file mode 100644
index 00000000000..94f7f4e4459
--- /dev/null
+++ b/boards/arm/atsamr21_xpro/pre_dt_board.cmake
@@ -0,0 +1,5 @@
+# Copyright (c) 2021 Linaro Limited
+# SPDX-License-Identifier: Apache-2.0
+
+# SPI is implemented via sercom so node name isn't spi@...
+list(APPEND EXTRA_DTC_FLAGS "-Wno-spi_bus_bridge")
diff --git a/boards/arm/efr32_radio/pre_dt_board.cmake b/boards/arm/efr32_radio/pre_dt_board.cmake
new file mode 100644
index 00000000000..beb76b85552
--- /dev/null
+++ b/boards/arm/efr32_radio/pre_dt_board.cmake
@@ -0,0 +1,5 @@
+# Copyright (c) 2021 Linaro Limited
+# SPDX-License-Identifier: Apache-2.0
+
+# SPI is implemented via usart so node name isn't spi@...
+list(APPEND EXTRA_DTC_FLAGS "-Wno-spi_bus_bridge")
diff --git a/boards/arm/efr32mg_sltb004a/pre_dt_board.cmake b/boards/arm/efr32mg_sltb004a/pre_dt_board.cmake
new file mode 100644
index 00000000000..beb76b85552
--- /dev/null
+++ b/boards/arm/efr32mg_sltb004a/pre_dt_board.cmake
@@ -0,0 +1,5 @@
+# Copyright (c) 2021 Linaro Limited
+# SPDX-License-Identifier: Apache-2.0
+
+# SPI is implemented via usart so node name isn't spi@...
+list(APPEND EXTRA_DTC_FLAGS "-Wno-spi_bus_bridge")