summaryrefslogtreecommitdiffstats
path: root/include/linux/regmap.h
diff options
context:
space:
mode:
authorMark Brown <broonie@opensource.wolfsonmicro.com>2012-12-19 14:51:55 +0000
committerMark Brown <broonie@opensource.wolfsonmicro.com>2013-01-02 10:58:53 +0000
commit2ac902ce17f9dfa0d4d1f0818be147b5d2515fb7 (patch)
tree20edcdd038f298fca0e39b658a40620e48ea1504 /include/linux/regmap.h
parenta49f0d1ea3ec94fc7cf33a7c36a16343b74bd565 (diff)
downloadop-kernel-dev-2ac902ce17f9dfa0d4d1f0818be147b5d2515fb7.zip
op-kernel-dev-2ac902ce17f9dfa0d4d1f0818be147b5d2515fb7.tar.gz
regmap: flat: Add flat cache type
While for I2C and SPI devices the overhead of using rbtree for devices with only one block of registers is negligible the same isn't always going to be true for MMIO devices where the I/O costs are very much lower. Cater for these devices by adding a simple flat array type for them where the lookups are simple array accesses, taking us right back to the original ASoC cache implementation. Thanks to Magnus Damm for the discussion which prompted this. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'include/linux/regmap.h')
-rw-r--r--include/linux/regmap.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index b7e95bf..390d879 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -28,7 +28,8 @@ struct regmap_range_cfg;
enum regcache_type {
REGCACHE_NONE,
REGCACHE_RBTREE,
- REGCACHE_COMPRESSED
+ REGCACHE_COMPRESSED,
+ REGCACHE_FLAT,
};
/**
OpenPOWER on IntegriCloud