[PATCH v2 1/5] cyclic: Add a symbol for SPL

[Simon Glass]

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.

Also add the kconfig.h header so that CONFIG_IS_ENABLED() works. We
could avoid this for now by moving the location of the watchdog.h
inclusion to outside the USE_HOSTCC area. But at some point the #ifdefs
from these files will likely be removed, so there is no benefit in
going that way.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v2:
- Add an SPL_CYCLIC symbol
- Add a lot more explanation about the header files

 common/Kconfig                    | 8 ++++++++
 common/Makefile                   | 2 +-
 drivers/watchdog/Kconfig          | 1 +
 include/asm-generic/global_data.h | 2 +-
 include/cyclic.h                  | 6 ++++--
 5 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/common/Kconfig b/common/Kconfig
index 0283701f1d05..5906a4af7c33 100644
--- a/common/Kconfig
+++ b/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 1000
diff --git a/common/Makefile b/common/Makefile
index 1495436d5d45..27443863bf9b 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -77,7 +77,7 @@ 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
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 07fc4940e918..378435c55cc7 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -395,6 +395,7 @@ 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.
diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index e8c6412e3f8d..77f11a4383c9 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -485,7 +485,7 @@ struct global_data {
 	 */
 	struct event_state event_state;
 #endif
-#ifdef CONFIG_CYCLIC
+#if CONFIG_IS_ENABLED(CYCLIC)
 	/**
 	 * @cyclic_list: list of registered cyclic functions
 	 */
diff --git a/include/cyclic.h b/include/cyclic.h
index 44ad3cb6b803..d3b368dd90df 100644
--- a/include/cyclic.h
+++ b/include/cyclic.h
@@ -11,6 +11,7 @@
 #ifndef __cyclic_h
 #define __cyclic_h
 
+#include <linux/kconfig.h>
 #include <linux/list.h>
 #include <asm/types.h>
 
@@ -44,7 +45,8 @@ struct cyclic_info {
 /** Function type for cyclic functions */
 typedef void (*cyclic_func_t)(void *ctx);
 
-#if defined(CONFIG_CYCLIC)
+#if CONFIG_IS_ENABLED(CYCLIC)
+
 /**
  * cyclic_register - Register a new cyclic function
  *
@@ -122,6 +124,6 @@ static inline int cyclic_unregister_all(void)
 {
 	return 0;
 }
-#endif
+#endif /* CYCLIC */
 
 #endif
-- 
2.43.0.rc1.413.gea7ed67945-goog