REG_OFFSET_MASK
reg &= REG_OFFSET_MASK;
reg &= REG_OFFSET_MASK;
ret = i2c_smbus_write_byte_data(client, reg & REG_OFFSET_MASK, val);
ret = i2c_smbus_read_byte_data(client, reg & REG_OFFSET_MASK);
id = FIELD_PREP(REG_OFFSET_MASK, spec->args[0]);
data->reboot_id = FIELD_PREP(REG_OFFSET_MASK, rb_id[0]);
*rst_req = FIELD_GET(REG_OFFSET_MASK, id);