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regmap: Allow caches for devices with no defaults

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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>
This commit is contained in:
Mark Brown 2011-10-09 13:13:58 +01:00
parent b03622a80d
commit 8528bdd450
1 changed files with 1 additions and 1 deletions
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2
drivers/base/regmap/regcache.c
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@ -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.