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regmap: Add a function to check if a regmap register is cached
Add a function to check if a regmap register is cached. This will be used in debugfs to dump the cached values of write only registers. Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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2 changed files with 24 additions and 0 deletions
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@ -173,6 +173,7 @@ struct regcache_ops {
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int (*drop)(struct regmap *map, unsigned int min, unsigned int max);
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};
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bool regmap_cached(struct regmap *map, unsigned int reg);
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bool regmap_writeable(struct regmap *map, unsigned int reg);
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bool regmap_readable(struct regmap *map, unsigned int reg);
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bool regmap_volatile(struct regmap *map, unsigned int reg);
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@ -93,6 +93,29 @@ bool regmap_writeable(struct regmap *map, unsigned int reg)
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return true;
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}
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bool regmap_cached(struct regmap *map, unsigned int reg)
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{
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int ret;
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unsigned int val;
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if (map->cache == REGCACHE_NONE)
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return false;
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if (!map->cache_ops)
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return false;
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if (map->max_register && reg > map->max_register)
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return false;
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map->lock(map->lock_arg);
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ret = regcache_read(map, reg, &val);
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map->unlock(map->lock_arg);
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if (ret)
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return false;
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return true;
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}
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bool regmap_readable(struct regmap *map, unsigned int reg)
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{
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if (!map->reg_read)
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