rtc: rv8803: Add support for the Epson RX8804 RTC

The Epson RX8804 RTC has the same programming model as RV8803.

Add support for it in the driver.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211130125830.1166194-2-festevam@gmail.com

drivers/rtc/rtc-rv8803.c

@@ -55,6 +55,7 @@
 
 enum rv8803_type {
 	rv_8803,
+	rx_8804,
 	rx_8900
 };
 
@@ -601,6 +602,7 @@ static int rv8803_probe(struct i2c_client *client,
 
 static const struct i2c_device_id rv8803_id[] = {
 	{ "rv8803", rv_8803 },
+	{ "rv8804", rx_8804 },
 	{ "rx8803", rv_8803 },
 	{ "rx8900", rx_8900 },
 	{ }
@@ -616,6 +618,10 @@ static const __maybe_unused struct of_device_id rv8803_of_match[] = {
 		.compatible = "epson,rx8803",
 		.data = (void *)rv_8803
 	},
+	{
+		.compatible = "epson,rx8804",
+		.data = (void *)rx_8804
+	},
 	{
 		.compatible = "epson,rx8900",
 		.data = (void *)rx_8900