regcache: Introduce the index parsing API by stride order

Here introduces regcache_get_index_by_order() for regmap cache,
which uses the register stride order and bit rotation, to improve
the performance.

Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index c22b04b..5c79526 100644 (file)
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -273,4 +273,10 @@ static inline unsigned int regmap_get_offset(const struct regmap *map,
                return index * map->reg_stride;
 }
 
+static inline unsigned int regcache_get_index_by_order(const struct regmap *map,
+                                                      unsigned int reg)
+{
+       return reg >> map->reg_stride_order;
+}
+
 #endif