lib: onoff: add a config for on-off and build conditionally

Do not build this service unconditionally.

Partial fix of #50654

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

drivers/clock_control/Kconfig.nrf

@@ -15,6 +15,7 @@ menuconfig CLOCK_CONTROL_NRF
 	default y
 	depends on DT_HAS_NORDIC_NRF_CLOCK_ENABLED
 	select NRFX_CLOCK if !CLOCK_CONTROL_NRF_FORCE_ALT
+	select ONOFF
 	help
 	  Enable support for the Nordic Semiconductor nRFxx series SoC clock
 	  driver.

drivers/regulator/Kconfig

@@ -3,6 +3,7 @@
 
 menuconfig REGULATOR
 	bool "Regulator drivers"
+	select ONOFF
 	help
 	  Include drivers for current/voltage regulators in system config
 

lib/os/CMakeLists.txt

@@ -14,7 +14,6 @@ zephyr_sources(
   hex.c
   notify.c
   printk.c
-  onoff.c
   rb.c
   sem.c
   thread_entry.c
@@ -25,6 +24,8 @@ zephyr_sources(
   multi_heap.c
   )
 
+zephyr_sources_ifdef(CONFIG_ONOFF onoff.c)
+
 zephyr_sources_ifdef(CONFIG_CBPRINTF_COMPLETE cbprintf_complete.c)
 zephyr_sources_ifdef(CONFIG_CBPRINTF_NANO cbprintf_nano.c)
 

lib/os/Kconfig

@@ -38,6 +38,13 @@ config MPSC_PBUF
 	  storing variable length packets in a circular way and operate directly
 	  on the buffer memory.
 
+config ONOFF
+	bool "On-Off Manager"
+	help
+	  An on-off manager supports an arbitrary number of clients of a
+	  service which has a binary state.  Example applications are power
+	  rails, clocks, and binary device power management.
+
 config SPSC_PBUF
 	bool "Single producer, single consumer packet buffer"
 	help

tests/lib/onoff/prj.conf

@@ -1,3 +1,4 @@
 CONFIG_POLL=y
 CONFIG_ZTEST=y
 CONFIG_ZTEST_NEW_API=y
+CONFIG_ONOFF=y