ISL12022_REG_DW
buf[ISL12022_REG_DW],
tm->tm_wday = buf[ISL12022_REG_DW] & 0x07;
u8 buf[ISL12022_REG_DW + 1];
buf[ISL12022_REG_DW] = tm->tm_wday & 0x07;
ret = regmap_read(regmap, ISL12022_REG_DW, &dw);