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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>
This commit is contained in:
Lars-Peter Clausen 2011-11-16 20:34:04 +01:00 committed by Mark Brown
parent 064d4db11e
commit b44d48c1cc
1 changed files with 0 additions and 3 deletions
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3
drivers/base/regmap/regcache.c
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@ -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);