soc: intel: Added support for sys_poweroff on adl and atom

Added support for sys_poweroff on ADL and ATOM socs based on
acpi_poweroff.

Signed-off-by: Anisetti Avinash Krishna <anisetti.avinash.krishna@intel.com>

Author: akanisetti

soc/intel/alder_lake/CMakeLists.txt

@@ -10,4 +10,6 @@ zephyr_cc_option(-march=goldmont)
 zephyr_library_sources(cpu.c)
 zephyr_library_sources(../common/soc_gpio.c)
 
+zephyr_library_sources_ifdef(CONFIG_POWEROFF ../common/power.c)
+
 set(SOC_LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld CACHE INTERNAL "")

soc/intel/alder_lake/Kconfig

@@ -9,3 +9,4 @@ config SOC_ALDER_LAKE
 	select PCIE_MSI
 	select DYNAMIC_INTERRUPTS
 	select X86_MMU
+	select HAS_POWEROFF if ACPI_POWEROFF

soc/intel/atom/CMakeLists.txt

@@ -3,4 +3,5 @@
 
 zephyr_include_directories(.)
 
+zephyr_library_sources_ifdef(CONFIG_POWEROFF ../common/power.c)
 set(SOC_LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld CACHE INTERNAL "")

soc/intel/atom/Kconfig

@@ -4,5 +4,6 @@
 config SOC_ATOM
 	select X86
 	select CPU_ATOM
+	select HAS_POWEROFF if ACPI_POWEROFF
 	imply X86_MMU
 	select ARCH_HAS_RESERVED_PAGE_FRAMES

soc/intel/common/power.c

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2025 Intel Corporation.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/sys/poweroff.h>
+#include <zephyr/acpi/acpi.h>
+
+void z_sys_poweroff(void)
+{
+#if defined(CONFIG_ACPI_POWEROFF)
+	acpi_poweroff();
+#endif
+	CODE_UNREACHABLE;
+}