cyclic: Add a symbol for SPL

The cyclic subsystem is currently enabled either in all build phases
or none. For tools this should not be enabled, but since lib/shc256.c
and other files include watchdog.h in the host build, we must make
sure that it is not enabled there.

Add an SPL symbol so that there is more control of this.

Add an include into cyclic.h so that tools can include this file.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Devarsh Thakkar <devarsht@ti.com>
Reviewed-by: Stefan Roese <sr@denx.de>

common/Kconfig

@@ -626,6 +626,14 @@ config CYCLIC
 
 if CYCLIC
 
+config SPL_CYCLIC
+	bool "General-purpose cyclic execution mechanism (SPL)"
+	help
+	  This enables a general-purpose cyclic execution infrastructure in SPL,
+	  to allow "small" (run-time wise) functions to be executed at
+	  a specified frequency. Things like LED blinking or watchdog
+	  triggering are examples for such tasks.
+
 config CYCLIC_MAX_CPU_TIME_US
 	int "Sets the max allowed time for a cyclic function in us"
 	default 5000

common/Makefile

@@ -79,7 +79,7 @@ obj-$(CONFIG_CROS_EC) += cros_ec.o
 obj-y += dlmalloc.o
 obj-$(CONFIG_$(SPL_TPL_)SYS_MALLOC_F) += malloc_simple.o
 
-obj-$(CONFIG_CYCLIC) += cyclic.o
+obj-$(CONFIG_$(SPL_TPL_)CYCLIC) += cyclic.o
 obj-$(CONFIG_$(SPL_TPL_)EVENT) += event.o
 
 obj-$(CONFIG_$(SPL_TPL_)HASH) += hash.o

drivers/watchdog/Kconfig

@@ -4,6 +4,7 @@ config WATCHDOG
 	bool "Enable U-Boot watchdog reset"
 	depends on !HW_WATCHDOG
 	select CYCLIC
+	imply SPL_CYCLIC if SPL
 	help
 	  This option enables U-Boot watchdog support where U-Boot is using
 	  watchdog_reset function to service watchdog device in U-Boot. Enable
@@ -408,6 +409,7 @@ config WDT_ARM_SMC
 config SPL_WDT
 	bool "Enable driver model for watchdog timer drivers in SPL"
 	depends on SPL_DM
+	select SPL_CYCLIC if CYCLIC
 	help
 	  Enable driver model for watchdog timer in SPL.
 	  This is similar to CONFIG_WDT in U-Boot.

include/asm-generic/global_data.h

@@ -481,7 +481,7 @@ struct global_data {
 	 */
 	struct event_state event_state;
 #endif
-#ifdef CONFIG_CYCLIC
+#if CONFIG_IS_ENABLED(CYCLIC)
 	/**
 	 * @cyclic_list: list of registered cyclic functions
 	 */

include/cyclic.h

@@ -46,7 +46,8 @@ struct cyclic_info {
 /** Function type for cyclic functions */
 typedef void (*cyclic_func_t)(struct cyclic_info *c);
 
-#if defined(CONFIG_CYCLIC)
+#if CONFIG_IS_ENABLED(CYCLIC)
+
 /**
  * cyclic_register - Register a new cyclic function
  *
@@ -123,6 +124,6 @@ static inline int cyclic_unregister_all(void)
 {
 	return 0;
 }
-#endif
+#endif /* CYCLIC */
 
 #endif