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regmap: Add support for discarding parts of the register cache

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Allow drivers to discard parts of the register cache, for example if part
of the hardware has been reset.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown
2013-05-08 13:55:22 +01:00
parent f722406faa
commit 697e85bc6a
4 changed files with 70 additions and 0 deletions
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37
drivers/base/regmap/regcache.c
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@@ -358,6 +358,43 @@ out:
}
EXPORT_SYMBOL_GPL(regcache_sync_region);
/**
* regcache_drop_region: Discard part of the register cache
*
* @map: map to operate on
* @min: first register to discard
* @max: last register to discard
*
* Discard part of the register cache.
*
* Return a negative value on failure, 0 on success.
*/
int regcache_drop_region(struct regmap *map, unsigned int min,
unsigned int max)
{
unsigned int reg;
int ret = 0;
if (!map->cache_present && !(map->cache_ops && map->cache_ops->drop))
return -EINVAL;
map->lock(map);
trace_regcache_drop_region(map->dev, min, max);
if (map->cache_present)
for (reg = min; reg < max + 1; reg++)
clear_bit(reg, map->cache_present);
if (map->cache_ops && map->cache_ops->drop)
ret = map->cache_ops->drop(map, min, max);
map->unlock(map);
return ret;
}
EXPORT_SYMBOL_GPL(regcache_drop_region);
/**
* regcache_cache_only: Put a register map into cache only mode
*