soc: nordic: nrf54: add nRF54L20 FLPR core

Added support for nRF54L20 FLPR core in soc dir.

Signed-off-by: Michał Stasiak <michal.stasiak@nordicsemi.no>

soc/nordic/common/vpr/Kconfig.sysbuild

@@ -4,7 +4,7 @@
 config VPR_LAUNCHER
 	bool "VPR launcher"
 	default y
-	depends on (SOC_NRF54H20_CPUPPR || SOC_NRF54H20_CPUFLPR || SOC_NRF54L15_CPUFLPR || SOC_NRF9280_CPUPPR)
+	depends on (SOC_NRF54H20_CPUPPR || SOC_NRF54H20_CPUFLPR || SOC_NRF54L15_CPUFLPR || SOC_NRF54L20_ENGA_CPUFLPR || SOC_NRF9280_CPUPPR)
 	help
 	  Include VPR launcher in build.
 	  VPR launcher is a minimal sample built for an ARM core that starts given VPR core.

soc/nordic/nrf54l/Kconfig

@@ -46,6 +46,9 @@ config SOC_NRF54L15_CPUFLPR
 config SOC_NRF54L20_ENGA_CPUAPP
 	select SOC_NRF54L_CPUAPP_COMMON
 
+config SOC_NRF54L20_ENGA_CPUFLPR
+	select RISCV_CORE_NORDIC_VPR
+
 if SOC_SERIES_NRF54LX
 
 config SOC_NRF54LX_SKIP_CLOCK_CONFIG

soc/nordic/nrf54l/Kconfig.defconfig.nrf54l20_enga_cpuflpr

@@ -0,0 +1,11 @@
+# Nordic Semiconductor nRF54L20 MCU
+
+# Copyright (c) 2025 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_NRF54L20_ENGA_CPUFLPR
+
+config NUM_IRQS
+	default 306
+
+endif # SOC_NRF54L20_ENGA_CPUFLPR

soc/nordic/nrf54l/Kconfig.soc

@@ -93,6 +93,12 @@ config SOC_NRF54L20_ENGA_CPUAPP
 	help
 	  NRF54L20 ENGA CPUAPP
 
+config SOC_NRF54L20_ENGA_CPUFLPR
+	bool
+	select SOC_NRF54L20_ENGA
+	help
+	  NRF54L20 ENGA CPUFLPR
+
 config SOC
 	default "nrf54l05" if SOC_NRF54L05
 	default "nrf54l09" if SOC_NRF54L09

soc/nordic/soc.yml

@@ -39,6 +39,7 @@ family:
           - name: nrf54l20
             cpuclusters:
               - name: cpuapp
+              - name: cpuflpr
       - name: nrf54h
         socs:
           - name: nrf54h20

soc/nordic/validate_base_addresses.c

@@ -339,7 +339,7 @@ CHECK_DT_REG(usbreg, NRF_USBREGULATOR);
 CHECK_DT_REG(vmc, NRF_VMC);
 CHECK_DT_REG(cpuflpr_clic, NRF_FLPR_VPRCLIC);
 CHECK_DT_REG(cpuppr_clic, NRF_PPR_VPRCLIC);
-#if defined(CONFIG_SOC_NRF54L05) || defined(CONFIG_SOC_NRF54L10) || defined(CONFIG_SOC_NRF54L15)
+#if defined(CONFIG_SOC_SERIES_NRF54LX)
 CHECK_DT_REG(cpuflpr_vpr, NRF_VPR00);
 #elif defined(CONFIG_NRF_PLATFORM_HALTIUM)
 CHECK_DT_REG(cpuflpr_vpr, NRF_VPR121);