boards: nrf54l15dk: configure nrf_regulators initial mode

Set regulator initial mode. This reduces the power consumption by
~80 uA in idle.

Signed-off-by: Eivind Jølsgard <[email protected]>

Author: eivindj-nordic

boards/nordic/bm_nrf54l15dk/CMakeLists.txt

@@ -5,3 +5,4 @@
 #
 
 zephyr_include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)
+zephyr_library_sources(init.c)

boards/nordic/bm_nrf54l15dk/Kconfig.bm_nrf54l15dk

@@ -8,3 +8,4 @@ config BOARD_BM_NRF54L15DK
 	select SOC_NRF54L05_CPUAPP if BOARD_BM_NRF54L15DK_NRF54L05_CPUAPP_S115_SOFTDEVICE || BOARD_BM_NRF54L15DK_NRF54L05_CPUAPP_S115_SOFTDEVICE_MCUBOOT
 	select SOC_NRF54L10_CPUAPP if BOARD_BM_NRF54L15DK_NRF54L10_CPUAPP_S115_SOFTDEVICE || BOARD_BM_NRF54L15DK_NRF54L10_CPUAPP_S115_SOFTDEVICE_MCUBOOT
 	select SOC_NRF54L15_CPUAPP if BOARD_BM_NRF54L15DK_NRF54L15_CPUAPP_S115_SOFTDEVICE || BOARD_BM_NRF54L15DK_NRF54L15_CPUAPP_S115_SOFTDEVICE_MCUBOOT
+	select BOARD_LATE_INIT_HOOK

boards/nordic/bm_nrf54l15dk/init.c

@@ -0,0 +1,11 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+#include <hal/nrf_regulators.h>
+
+void board_late_init_hook(void)
+{
+	nrf_regulators_vreg_enable_set(NRF_REGULATORS, NRF_REGULATORS_VREG_MAIN, true);
+}