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regmap: Cache single values read from the chip

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If we don't have a cached value for a register and we can cache it then
when we do a read a value we should add it to the cache to save rereading
it later on. Do this for single register reads, for block reads the code
would be a little more complex and this covers most practical usage.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2012-04-30 21:25:05 +01:00
parent d939fb9a78
commit f298536728
1 changed files with 3 additions and 0 deletions
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3
drivers/base/regmap/regmap.c
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@ -698,6 +698,9 @@ static int _regmap_read(struct regmap *map, unsigned int reg,
trace_regmap_reg_read(map->dev, reg, *val);
}
if (ret == 0 && !map->cache_bypass)
regcache_write(map, reg, *val);
return ret;
}