boards: arm: thingy91: Add option to disable pre-defined layout

Allow using none of the pre-defined static partition layouts for
thingy:91. This allows the application to use a dynamic layout or
define a custom static partition layout for the application.

Signed-off-by: Gregers Gram Rygg <gregers.gram.rygg@nordicsemi.no>

boards/arm/thingy91_nrf9160/Kconfig.board

@@ -15,7 +15,7 @@ config BOARD_THINGY91_NRF9160_NS
 if BOARD_THINGY91_NRF9160_NS
 
 choice
-	prompt "Thingy:91 partition layout"
+	prompt "Pre-defined Thingy:91 partition layout"
 	default THINGY91_STATIC_PARTITIONS_SECURE_BOOT if SECURE_BOOT
 	default THINGY91_STATIC_PARTITIONS_LWM2M_CARRIER if LWM2M_CARRIER
 	default THINGY91_STATIC_PARTITIONS_FACTORY
@@ -42,6 +42,14 @@ config THINGY91_STATIC_PARTITIONS_LWM2M_CARRIER
 	help
 	  Use a partition layout including a storage partition needed for the lwm2m carrier library.
 
+config THINGY91_NO_PREDEFINED_LAYOUT
+	bool "None [EXPERIMENTAL]"
+	select EXPERIMENTAL
+	help
+	   Disable pre-defined static partition layout. This allows the application to use a dynamic
+	   layout or define a custom static partition layout for the application. A debugger is
+	   needed to flash Thingy:91 with a different partition layout.
+
 endchoice
 
 endif # BOARD_THINGY91_NRF9160_NS

doc/nrf/device_guides/working_with_nrf/nrf91/thingy91.rst

@@ -655,3 +655,7 @@ Configure the partition layout using one of the following configuration options:
   A debugger is needed to program Thingy:91 for the first time.
   This is an :ref:`experimental <software_maturity>` feature.
 * :kconfig:option:`CONFIG_THINGY91_STATIC_PARTITIONS_LWM2M_CARRIER` - This option uses a partition layout, including a storage partition needed for the :ref:`liblwm2m_carrier_readme` library.
+* :kconfig:option:`CONFIG_THINGY91_NO_PREDEFINED_LAYOUT` - Enabling this option disables Thingy:91 pre-defined static partitions.
+  This allows the application to use a dynamic layout or define a custom static partition layout for the application.
+  A debugger is needed to program Thingy:91 for the first time.
+  This is an :ref:`experimental <software_maturity>` feature.