regmap: Drop check whether a register is readable in regcache_read

One of the reasons for using a cache is to have a software shadow of a register
which is writable but not readable. This allows us to do a read-modify-write
operation on such a register.

Currently regcache checks whether a register is readable when performing a
cached read and returns an error if it is not. Drop this check, since it will
prevent us from using the cache for registers where read-back is not possible.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 0 insertions, 3 deletions

diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 6d93e49c462f..e21eebd36afa 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -199,9 +199,6 @@ int regcache_read(struct regmap *map,
 
         BUG_ON(!map->cache_ops);
 
-        if (!regmap_readable(map, reg))
-                return -EIO;
-
         if (!regmap_volatile(map, reg))
                 return map->cache_ops->read(map, reg, value);