Merge branch '2022-03-09-events-subsystem' into nextnext

To quote the author:
It is a common need in U-Boot to have one subsystem notify another
when something happens. An example is reading a partition table when a
new block device is set up.

It is also common to add weak functions and 'hook' functions to modify
how U-Boot works. See for example ft_board_setup() and the like.

U-Boot would benefit from a generic mechanism to handle these cases,
with the ability to hook into various 'events' in a
subsystem-independent and transparent way.

This series provides a way to create and dispatch events, with a way of
registering a 'spy' which watches for events of different types. This
allows 'hook' functions to be created in a generic way.

It also includes a script to list the hooks in an image, which is a bit
easier to debug than weak functions, as well as an 'event' command to
do the same from within U-Boot.

These 'static' events can be used to replace hooks like misc_init_f(),
for example. Also included is basic support for 'dynamic' events, where
a spy can be registered at runtime. The need for this is still being
figured out.

1 files changed, 4 insertions, 0 deletions

diff --git a/test/test-main.c b/test/test-main.c
index 8fcb02e..ee38d1f 100644
--- a/test/test-main.c
+++ b/test/test-main.c
@@ -7,6 +7,7 @@
 #include <common.h>
 #include <console.h>
 #include <dm.h>
+#include <event.h>
 #include <dm/root.h>
 #include <dm/test.h>
 #include <dm/uclass-internal.h>
@@ -218,6 +219,8 @@ static int dm_test_restore(struct device_node *of_root)
  */
 static int test_pre_run(struct unit_test_state *uts, struct unit_test *test)
 {
+	ut_assertok(event_init());
+
 	if (test->flags & UT_TESTF_DM)
 		ut_assertok(dm_test_pre_run(uts));
 
@@ -260,6 +263,7 @@ static int test_post_run(struct unit_test_state *uts, struct unit_test *test)
 	ut_unsilence_console(uts);
 	if (test->flags & UT_TESTF_DM)
 		ut_assertok(dm_test_post_run(uts));
+	ut_assertok(event_uninit());
 
 	return 0;
 }