regmap: cache: Add warning info for the cache check

If there is no cache used for the drivers, the register defaults
or the register defaults raw are not need any more. This patch
will check this and print a warning.

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

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 4c07802986b2..9436a0d4cf71 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -100,15 +100,19 @@ int regcache_init(struct regmap *map, const struct regmap_config *config)
         int i;
         void *tmp_buf;
 
-        for (i = 0; i < config->num_reg_defaults; i++)
-                if (config->reg_defaults[i].reg % map->reg_stride)
-                        return -EINVAL;
-
         if (map->cache_type == REGCACHE_NONE) {
+                if (config->reg_defaults || config->num_reg_defaults_raw)
+                        dev_warn(map->dev,
+                                 "No cache used with register defaults set!\n");
+
                 map->cache_bypass = true;
                 return 0;
         }
 
+        for (i = 0; i < config->num_reg_defaults; i++)
+                if (config->reg_defaults[i].reg % map->reg_stride)
+                        return -EINVAL;
+
         for (i = 0; i < ARRAY_SIZE(cache_types); i++)
                 if (cache_types[i]->type == map->cache_type)
                         break;