lib: sbi: add priority for reset handler

Let's make system_reset_check returning priority instead of only
true/false. In that case 0 - means not supported, and anything above
means priority that makes existing reset handlers being used in first
place, unless it is decided to lower their priority.

The handler with the most priority wins.

Signed-off-by: Nikita Shubin <n.shubin@yadro.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

1 files changed, 18 insertions, 6 deletions

diff --git a/lib/sbi/sbi_system.c b/lib/sbi/sbi_system.c
index a4e4781..9cea3c0 100644
--- a/lib/sbi/sbi_system.c
+++ b/lib/sbi/sbi_system.c
@@ -23,18 +23,30 @@ static SBI_LIST_HEAD(reset_devices_list);
 const struct sbi_system_reset_device *sbi_system_reset_get_device(
 					u32 reset_type, u32 reset_reason)
 {
-	struct sbi_system_reset_device *dev = 0;
+	struct sbi_system_reset_device *reset_dev = NULL;
 	struct sbi_dlist *pos;
+	/** lowest priority - any non zero is our candidate */
+	int priority = 0;
 
 	/* Check each reset device registered for supported reset type */
 	sbi_list_for_each(pos, &(reset_devices_list)) {
-		dev = to_system_reset_device(pos);
-		if (dev->system_reset_check &&
-			dev->system_reset_check(reset_type, reset_reason))
-			break;
+		struct sbi_system_reset_device *dev =
+			to_system_reset_device(pos);
+		if (dev->system_reset_check) {
+			int status = dev->system_reset_check(reset_type,
+							     reset_reason);
+			/** reset_type not supported */
+			if (status == 0)
+				continue;
+
+			if (status > priority) {
+				reset_dev = dev;
+				priority = status;
+			}
+		}
 	}
 
-	return dev;
+	return reset_dev;
 }
 
 void sbi_system_reset_add_device(struct sbi_system_reset_device *dev)