_regmap_read
ret = _regmap_read(map, reg, val);
ret = _regmap_read(map, reg, val);
ret = _regmap_read(map, reg + regmap_get_offset(map, i),
ret = _regmap_read(map, regs[i], &ival);
ret = _regmap_read(map, reg + regmap_get_offset(map, i), &ival);
ret = _regmap_read(map, reg, &orig);