regcache_read
int regcache_read(struct regmap *map,
ret = regcache_read(map, reg, &val);
if (regcache_read(map, this->selector_reg, &i) != 0)
ret = regcache_read(map, reg, &val);
ret = regcache_read(map, reg, &val);
ret = regcache_read(map, reg, val);