regmap: Add trace event for successful cache reads

Currently we only trace physical reads, there's no instrumentation if
the read is satisfied from cache.

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

1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 1ca2d7a1051f..1ead66186b7c 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -193,13 +193,21 @@ void regcache_exit(struct regmap *map)
 int regcache_read(struct regmap *map,
                   unsigned int reg, unsigned int *value)
 {
+        int ret;
+
         if (map->cache_type == REGCACHE_NONE)
                 return -ENOSYS;
 
         BUG_ON(!map->cache_ops);
 
-        if (!regmap_volatile(map, reg))
-                return map->cache_ops->read(map, reg, value);
+        if (!regmap_volatile(map, reg)) {
+                ret = map->cache_ops->read(map, reg, value);
+
+                if (ret == 0)
+                        trace_regmap_reg_read_cache(map->dev, reg, *value);
+
+                return ret;
+        }
 
         return -EINVAL;
 }