[PATCH] event: add an event for livetree fixups

[Caleb Connolly]

Introduce a new EVT_OF_LIVE event to allow for the livetree to be
modified before dm_init_and_scan(). Boards can perform fixups here to
handle incompatibilities between U-Boot drivers and upstream DT.

This will be used by Qualcomm platforms in future patches to enable
setting the dr_mode property if the board doesn't provide one. This has to be
set before dm_init_and_scan() is called as this property effects the binding of
drivers.

Signed-off-by: Caleb Connolly <caleb.connolly at linaro.org>
---
 common/board_r.c |  1 +
 common/event.c   |  2 ++
 include/event.h  | 12 ++++++++++++
 3 files changed, 15 insertions(+)

diff --git a/common/board_r.c b/common/board_r.c
index da0b80f24ff0..7d2da51193ab 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -217,8 +217,9 @@ static int initr_of_live(void)
 				    (struct device_node **)gd_of_root_ptr());
 		bootstage_accum(BOOTSTAGE_ID_ACCUM_OF_LIVE);
 		if (ret)
 			return ret;
+		event_notify_null(EVT_OF_LIVE);
 	}
 
 	return 0;
 }
diff --git a/common/event.c b/common/event.c
index 16c2ba6cc921..db32ea0d06f8 100644
--- a/common/event.c
+++ b/common/event.c
@@ -45,8 +45,10 @@ const char *const type_name[] = {
 
 	/* fdt hooks */
 	"ft_fixup",
 
+	"of_live",
+
 	/* main loop events */
 	"main_loop",
 };
 
diff --git a/include/event.h b/include/event.h
index a8f046da3c32..c6436c07d16f 100644
--- a/include/event.h
+++ b/include/event.h
@@ -144,8 +144,20 @@ enum event_t {
 	 * images fail.
 	 */
 	EVT_FT_FIXUP,
 
+	/**
+	 * @EVT_OF_LIVE:
+	 * This event is triggered when using CONFIG_OF_LIVE immediately after
+	 * the live tree has been created. It has no parameters, the live tree
+	 * can be accessed from gd->of_root, or using the of_* helpers.
+	 *
+	 * This is intended to be used for performing board specific fixups
+	 * on the tree before it is used by U-Boot. It is much more efficient
+	 * to access and modify than the FDT.
+	 */
+	EVT_OF_LIVE,
+
 	/**
 	 * @EVT_MAIN_LOOP:
 	 * This event is triggered immediately before calling main_loop() which
 	 * is the entry point of the command line. Its parameter is NULL.
-- 
2.44.0