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authorMark Brown <broonie@opensource.wolfsonmicro.com>2011-10-09 13:13:58 +0100
committerMark Brown <broonie@opensource.wolfsonmicro.com>2011-10-10 11:55:32 +0100
commit8528bdd450d34687b380c0f87992d105bdf54ca3 (patch)
tree1a91b49ac3be49e677f438ab0608b7ec8ebd3c72 /drivers/base
parentb03622a80d2206c4179d6a41a0dc5cfbdfc853ee (diff)
regmap: Allow caches for devices with no defaults
We only really need the defaults in order to cut down the number of registers we sync and to satisfy reads while the device is powered off but not all devices are going to need to do that (always on devices like PMICs being the prime example) so don't require those devices to supply a default. Instead only try to fall back to hardware defaults if the driver told us to. Devices using LZO won't be able to instantiate with this, that will require some updates in the LZO code to handle this case. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/regmap/regcache.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 409abd282c6..afcfef83826 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -119,7 +119,7 @@ int regcache_init(struct regmap *map)
if (!tmp_buf)
return -ENOMEM;
map->reg_defaults = tmp_buf;
- } else {
+ } else if (map->num_reg_defaults_raw) {
/* Some devices such as PMICs don't have cache defaults,
* we cope with this by reading back the HW registers and
* crafting the cache defaults by hand.