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>
diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 6d93e49..e21eebd 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -199,9 +199,6 @@
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);
