[nrf fromlist] pm: policy: split policy APIs implementations

policy.c has grown organically, it contained many independent pieces of
code. This patch splits each logical unit into its own C file, making it
easier to browse the code.

Upstream PR: zephyrproject-rtos/zephyr#80238

Signed-off-by: Gerard Marull-Paretas <[email protected]>
(cherry picked from commit e2fb314d39c18a61815f44a01bee1483b2342d41)

Author: gmarull

subsys/pm/CMakeLists.txt

@@ -1,10 +1,12 @@
 # SPDX-License-Identifier: Apache-2.0
 
 if(CONFIG_PM)
-  zephyr_sources(pm.c policy.c state.c)
+  zephyr_sources(pm.c state.c)
   zephyr_sources_ifdef(CONFIG_PM_STATS pm_stats.c)
 endif()
 
+add_subdirectory(policy)
+
 zephyr_sources_ifdef(CONFIG_PM_DEVICE device.c)
 zephyr_sources_ifdef(CONFIG_PM_DEVICE_RUNTIME device_runtime.c)
 zephyr_sources_ifdef(CONFIG_PM_DEVICE_SHELL pm_shell.c)

subsys/pm/Kconfig

@@ -19,6 +19,8 @@ config PM
 	  power management subsystem of the number of ticks until the next kernel
 	  timer is due to expire.
 
+rsource "policy/Kconfig"
+
 if PM
 
 module = PM
@@ -51,35 +53,6 @@ config PM_NEED_ALL_DEVICES_IDLE
 	  When this option is enabled, check that no devices are busy before
 	  entering into system low power mode.
 
-choice PM_POLICY
-	prompt "Idle State Power Management Policy"
-	default PM_POLICY_DEFAULT
-	help
-	  Select the idle state power management policy.
-
-config PM_POLICY_DEFAULT
-	bool "Default PM policy"
-	help
-	  This option selects the default PM policy. Default policy is based
-	  on CPU residency times and other constraints imposed by the drivers or
-	  application.
-
-config PM_POLICY_CUSTOM
-	bool "Custom PM Policy"
-	help
-	  This options allows applications to override the default policy with
-	  a custom implementation.
-
-endchoice
-
-config PM_POLICY_DEVICE_CONSTRAINTS
-	bool "Power state constraints per device"
-	help
-	  This option allows devices to have a list of power states
-	  that when the system transition to them, cause power loss in the device.
-	  This used to set and release power state constraints when
-	  it is needed by the device.
-
 endif # PM
 
 config PM_DEVICE