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regmap: Add better support for devices without readback support

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Currently regmap requires that a reg_read callback is supplied, otherwise a
warning is emitted each time regmap_read() is called. This means a device
or bus without readback support needs to supply dummy reg_read callback.
Apart from that regmap_read() will still work fine if a cache is used.

Remove the warning and let regmap_readable() return false if not reg_read
callback is supplied. This means a device no longer has to supply a dummy
callback if it does not support readback and it also doesn't have to have a
readable_reg callback that always returns false since this is now implicit.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2015-07-13 12:26:44 +02:00 committed by Mark Brown
parent d770e558e2
commit 04dc91ce2c
1 changed files with 3 additions and 2 deletions
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5
drivers/base/regmap/regmap.c
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@ -93,6 +93,9 @@ bool regmap_writeable(struct regmap *map, unsigned int reg)
bool regmap_readable(struct regmap *map, unsigned int reg)
{
if (!map->reg_read)
return false;
if (map->max_register && reg > map->max_register)
return false;
@ -2097,8 +2100,6 @@ static int _regmap_read(struct regmap *map, unsigned int reg,
int ret;
void *context = _regmap_map_get_context(map);
WARN_ON(!map->reg_read);
if (!map->cache_bypass) {
ret = regcache_read(map, reg, val);
if (ret == 0)