diff --git a/subsys/bluetooth/controller/Kconfig.ll_sw_split b/subsys/bluetooth/controller/Kconfig.ll_sw_split
index bc2763f6529..ed1b8d3da65 100644
--- a/subsys/bluetooth/controller/Kconfig.ll_sw_split
+++ b/subsys/bluetooth/controller/Kconfig.ll_sw_split
@@ -649,9 +649,9 @@ config BT_CTLR_GPIO_PA_POL_INV
 config BT_CTLR_GPIO_PA_OFFSET
 	int "Time from PA ON to Tx ready"
 	default 5
-	range 0 10
+	range 0 15
 	help
-	  Time before Tx ready to turn on PA.
+	  Time before Tx ready to turn on PA in micro seconds.
 
 endif # BT_CTLR_GPIO_PA
 
@@ -680,12 +680,57 @@ config BT_CTLR_GPIO_LNA_POL_INV
 config BT_CTLR_GPIO_LNA_OFFSET
 	int "Time from LNA ON to Rx ready"
 	default 5
-	range 0 10
+	range 0 15
 	help
-	  Time before Rx ready to turn on LNA.
+	  Time before Rx ready to turn on LNA in micro seconds.
 
 endif # BT_CTLR_GPIO_LNA
 
+menuconfig BT_CTLR_FEM_NRF21540
+	bool "nRF21540 GPIO interface"
+	depends on !SOC_SERIES_NRF51X
+	select BT_CTLR_GPIO_PA
+	select BT_CTLR_GPIO_LNA
+	help
+	  Enable PDN and CSN GPIO interface for the nRF21540. This allows
+	  hardware designs using the nRF21540 to let the controller toggle
+	  their state based on radio activity.
+
+if BT_CTLR_FEM_NRF21540
+
+config BT_CTLR_GPIO_PDN_PIN
+	int "FEM PDN pin number"
+	range 0 47 if SOC_NRF52840 || SOC_NRF5340_CPUNET
+	range 0 31
+	help
+	  GPIO Pin number connected to the PDN pin of the nRF21540 FEM.
+
+config BT_CTLR_GPIO_PDN_POL_INV
+	bool "Inverted polarity for the PDN pin"
+	help
+	  Enable inverted polarity (active low) for the PDN pin.
+
+config BT_CTLR_GPIO_CSN_PIN
+	int "FEM CSN pin number"
+	range 0 47 if SOC_NRF52840 || SOC_NRF5340_CPUNET
+	range 0 31
+	help
+	  GPIO Pin number connected to the CSN pin of the nRF21540 FEM.
+
+config BT_CTLR_GPIO_CSN_POL_INV
+	bool "Inverted polarity for the CSN pin"
+	default y
+	help
+	  Enable inverted polarity (active low) for the CSN pin.
+
+config BT_CTLR_GPIO_PDN_CSN_OFFSET
+	int "Time from PDN and CSN toggle to PA/LNA pin toggle"
+	range 0 20
+	help
+	  Time from PDN and CSN toggle to PA/LNA pin toggle in micro seconds.
+
+endif # BT_CTLR_FEM_NRF21540
+
 config BT_CTLR_PA_LNA_GPIOTE_CHAN
 	# Hidden "nRF5 GPIO PA/LNA GPIOTE Channel"
 	int
@@ -695,6 +740,24 @@ config BT_CTLR_PA_LNA_GPIOTE_CHAN
 	help
 	  Select the nRF5 GPIOTE channel to use for PA/LNA GPIO feature.
 
+config BT_CTLR_PDN_GPIOTE_CHAN
+	# Hidden "nRF5 GPIO FEM PDN GPIOTE Channel"
+	int
+	depends on SOC_FAMILY_NRF && BT_CTLR_FEM_NRF21540
+	default 4 if PWM_NRF5_SW
+	default 1
+	help
+	  Select the nRF5 GPIOTE channel to use for FEM PDN GPIO pin toggle.
+
+config BT_CTLR_CSN_GPIOTE_CHAN
+	# Hidden "nRF5 GPIO FEM CSN GPIOTE Channel"
+	int
+	depends on SOC_FAMILY_NRF && BT_CTLR_FEM_NRF21540
+	default 5 if PWM_NRF5_SW
+	default 2
+	help
+	  Select the nRF5 GPIOTE channel to use for FEM CSN GPIO pin toggle.
+
 comment "BLE Controller debug configuration"
 
 config BT_CTLR_PROFILE_ISR