[nrf fromlist] cpuconf: SYS_INIT for booting rad from app

SYS_INIT for booting rad from app.

Upstream PR #: 88908

Signed-off-by: Sebastian Bøe <[email protected]>

Author: SebastianBoe

soc/nordic/nrf54h/CMakeLists.txt

@@ -9,6 +9,7 @@ if(CONFIG_ARM)
 endif()
 
 zephyr_library_sources_ifdef(CONFIG_PM_S2RAM pm_s2ram.c)
+zephyr_library_sources_ifdef(CONFIG_SOC_NRF54H20_CPURAD_ENABLE cpurad_mgmt.c)
 
 zephyr_include_directories(.)
 

soc/nordic/nrf54h/Kconfig

@@ -63,6 +63,13 @@ config SOC_NRF54H20_CPURAD_COMMON
 	select HAS_PM
 	select HAS_POWEROFF
 
+config SOC_NRF54H20_CPURAD_ENABLE
+	bool "NRF54H20 Radio core is enabled at boot time"
+	default y if NRF_802154_SER_HOST
+	help
+	  This option enables releasing the Radio 'force off' signal, which
+	  as a consequence will power up the Radio core during system boot.
+
 config SOC_NRF54H20_CPURAD
 	select SOC_NRF54H20_CPURAD_COMMON
 

soc/nordic/nrf54h/cpurad_mgmt.c

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file Nordic Semiconductor nRF54h20 processors family management helper for the radio core.
+ */
+
+#include <zephyr/init.h>
+
+#include <ironside/se/cpuconf.h>
+
+static int nrf54h20_cpurad_init(void)
+{
+	uint32_t dummy = 0xbadcafe;
+
+	return ironside_se_cpuconf_boot_radiocore((uint8_t*)&dummy, sizeof(dummy));
+}
+
+SYS_INIT(nrf54h20_cpurad_init, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);