regmap: Add the regcache_sync trace event

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/base/regmap/regcache.c

@@ -221,12 +221,18 @@ EXPORT_SYMBOL_GPL(regcache_write);
  */
 int regcache_sync(struct regmap *map)
 {
+	int ret;
+	const char *name;
+
 	BUG_ON(!map->cache_ops);
 
 	if (map->cache_ops->sync) {
 		dev_dbg(map->dev, "Syncing %s cache\n",
 			map->cache_ops->name);
-		return map->cache_ops->sync(map);
+		name = map->cache_ops->name;
+		trace_regcache_sync(map->dev, name, "start");
+		ret = map->cache_ops->sync(map);
+		trace_regcache_sync(map->dev, name, "stop");
 	}
 	return 0;
 }

include/trace/events/regmap.h

@@ -106,6 +106,30 @@ DEFINE_EVENT(regmap_block, regmap_hw_write_done,
 	TP_ARGS(dev, reg, count)
 );
 
+TRACE_EVENT(regcache_sync,
+
+	TP_PROTO(struct device *dev, const char *type,
+		 const char *status),
+
+	TP_ARGS(dev, type, status),
+
+	TP_STRUCT__entry(
+		__string(       name,           dev_name(dev)   )
+		__string(	status,		status		)
+		__string(	type,		type		)
+		__field(	int,		type		)
+	),
+
+	TP_fast_assign(
+		__assign_str(name, dev_name(dev));
+		__assign_str(status, status);
+		__assign_str(type, type);
+	),
+
+	TP_printk("%s type=%s status=%s", __get_str(name),
+		  __get_str(type), __get_str(status))
+);
+
 #endif /* _TRACE_REGMAP_H */
 
 /* This part must be outside protection */