common: reset_source: Add the notion of "reset source instance"

In order to accomodate SoCs that come with multiple watchdogs (or any
other reset sources of the same kind) add a notion of "reset source
instance", similar to what we already have for bootsource API.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

2 files changed, 28 insertions, 0 deletions

diff --git a/common/reset_source.c b/common/reset_source.c
index 06e2ca85f5..6a6c4f5daf 100644
--- a/common/reset_source.c
+++ b/common/reset_source.c
@@ -32,6 +32,7 @@ static const char * const reset_src_names[] = {
 
 static enum reset_src_type reset_source;
 static unsigned int reset_source_priority;
+static int reset_source_instance;
 
 enum reset_src_type reset_source_get(void)
 {
@@ -39,6 +40,12 @@ enum reset_src_type reset_source_get(void)
 }
 EXPORT_SYMBOL(reset_source_get);
 
+int reset_source_get_instance(void)
+{
+	return reset_source_instance;
+}
+EXPORT_SYMBOL(reset_source_get_instance);
+
 void reset_source_set_priority(enum reset_src_type st, unsigned int priority)
 {
 	if (priority <= reset_source_priority)
@@ -46,17 +53,27 @@ void reset_source_set_priority(enum reset_src_type st, unsigned int priority)
 
 	reset_source = st;
 	reset_source_priority = priority;
+	reset_source_instance = 0;
 
 	pr_debug("Setting reset source to %s with priority %d\n",
 			reset_src_names[reset_source], priority);
 }
 EXPORT_SYMBOL(reset_source_set_priority);
 
+void reset_source_set_instance(enum reset_src_type type, int instance)
+{
+	if (reset_source == type)
+		reset_source_instance = instance;
+}
+EXPORT_SYMBOL(reset_source_set_instance);
+
 static int reset_source_init(void)
 {
 	globalvar_add_simple_enum("system.reset", (unsigned int *)&reset_source,
 			reset_src_names, ARRAY_SIZE(reset_src_names));
 
+	globalvar_add_simple_int("system.reset_instance", &reset_source_instance,
+				 "%d");
 	return 0;
 }
 
diff --git a/include/reset_source.h b/include/reset_source.h
index 3ff06b70ad..c9911c008c 100644
--- a/include/reset_source.h
+++ b/include/reset_source.h
@@ -27,6 +27,8 @@ enum reset_src_type {
 #ifdef CONFIG_RESET_SOURCE
 void reset_source_set_priority(enum reset_src_type, unsigned int priority);
 enum reset_src_type reset_source_get(void);
+void reset_source_set_instance(enum reset_src_type type, int instance);
+int reset_source_get_instance(void);
 unsigned int of_get_reset_source_priority(struct device_node *node);
 #else
 static inline void reset_source_set_priority(enum reset_src_type type,
@@ -34,11 +36,20 @@ static inline void reset_source_set_priority(enum reset_src_type type,
 {
 }
 
+static inline void reset_source_set_instance(enum reset_src_type type, int instance)
+{
+}
+
 static inline enum reset_src_type reset_source_get(void)
 {
 	return RESET_UKWN;
 }
 
+static inline int reset_source_get_instance(void)
+{
+	return 0;
+}
+
 static inline unsigned int of_get_reset_source_priority(struct device_node *node)
 {
 	return 0;