rtc: nuvoton: Modify part number value

Base on datasheet,
    the part number is corresponding to bit 0 and 1 of the part info reg.
Signed-off-by: Mia Lin <mimi05633@gmail.com>
Link: https://lore.kernel.org/r/20240311013405.3398823-2-mimi05633@gmail.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-nct3018y.c

@@ -517,12 +517,15 @@ static int nct3018y_probe(struct i2c_client *client)
 	if (nct3018y->part_num < 0) {
 		dev_dbg(&client->dev, "Failed to read NCT3018Y_REG_PART.\n");
 		return nct3018y->part_num;
-	} else if (nct3018y->part_num == NCT3018Y_REG_PART_NCT3018Y) {
-		flags = NCT3018Y_BIT_HF;
-		err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_CTRL, flags);
-		if (err < 0) {
-			dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_CTRL.\n");
-			return err;
+	} else {
+		nct3018y->part_num &= 0x03; /* Part number is corresponding to bit 0 and 1 */
+		if (nct3018y->part_num == NCT3018Y_REG_PART_NCT3018Y) {
+			flags = NCT3018Y_BIT_HF;
+			err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_CTRL, flags);
+			if (err < 0) {
+				dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_CTRL.\n");
+				return err;
+			}
 		}
 	}