rtc: pcf85063: add support for RV8063

Microcrystal RV8063 is a real-time clock with SPI interface. Its
functionality is very similar to the RV8263 rtc.

Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com>
Link: https://lore.kernel.org/r/20250413130755.159373-4-apokusinski01@gmail.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: panantoni01

drivers/rtc/Kconfig

@@ -483,15 +483,6 @@ config RTC_DRV_PCF8523
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-pcf8523.
 
-config RTC_DRV_PCF85063
-	tristate "NXP PCF85063"
-	select REGMAP_I2C
-	help
-	  If you say yes here you get support for the PCF85063 RTC chip
-
-	  This driver can also be built as a module. If so, the module
-	  will be called rtc-pcf85063.
-
 config RTC_DRV_PCF85363
 	tristate "NXP PCF85363"
 	select REGMAP_I2C
@@ -971,6 +962,18 @@ config RTC_DRV_PCF2127
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-pcf2127.
 
+config RTC_DRV_PCF85063
+	tristate "NXP PCF85063"
+	depends on RTC_I2C_AND_SPI
+	select REGMAP_I2C if I2C
+	select REGMAP_SPI if SPI_MASTER
+	help
+	  If you say yes here you get support for the PCF85063 and RV8063
+	  RTC chips.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-pcf85063.
+
 config RTC_DRV_RV3029C2
 	tristate "Micro Crystal RV3029/3049"
 	depends on RTC_I2C_AND_SPI

drivers/rtc/rtc-pcf85063.c

@@ -17,6 +17,7 @@
 #include <linux/of.h>
 #include <linux/pm_wakeirq.h>
 #include <linux/regmap.h>
+#include <linux/spi/spi.h>
 
 /*
  * Information for this driver was pulled from the following datasheets.
@@ -29,6 +30,9 @@
  *
  *  https://www.microcrystal.com/fileadmin/Media/Products/RTC/App.Manual/RV-8263-C7_App-Manual.pdf
  *  RV8263 -- Rev. 1.0 — January 2019
+ *
+ *  https://www.microcrystal.com/fileadmin/Media/Products/RTC/App.Manual/RV-8063-C7_App-Manual.pdf
+ *  RV8063 -- Rev. 1.1 - October 2018
  */
 
 #define PCF85063_REG_CTRL1		0x00 /* status */
@@ -559,6 +563,18 @@ static const struct pcf85063_config config_rv8263 = {
 	.force_cap_7000 = 1,
 };
 
+static const struct pcf85063_config config_rv8063 = {
+	.regmap = {
+		.reg_bits = 8,
+		.val_bits = 8,
+		.max_register = 0x11,
+		.read_flag_mask = BIT(7) | BIT(5),
+		.write_flag_mask = BIT(5),
+	},
+	.has_alarms = 1,
+	.force_cap_7000 = 1,
+};
+
 static int pcf85063_probe(struct device *dev, struct regmap *regmap, int irq,
 			  const struct pcf85063_config *config)
 {
@@ -725,14 +741,83 @@ static void pcf85063_unregister_driver(void)
 
 #endif /* IS_ENABLED(CONFIG_I2C) */
 
+#if IS_ENABLED(CONFIG_SPI_MASTER)
+
+static const struct spi_device_id rv8063_id[] = {
+	{ "rv8063" },
+	{}
+};
+MODULE_DEVICE_TABLE(spi, rv8063_id);
+
+static const struct of_device_id rv8063_of_match[] = {
+	{ .compatible = "microcrystal,rv8063" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, rv8063_of_match);
+
+static int rv8063_probe(struct spi_device *spi)
+{
+	const struct pcf85063_config *config = &config_rv8063;
+	struct regmap *regmap;
+
+	regmap = devm_regmap_init_spi(spi, &config->regmap);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	return pcf85063_probe(&spi->dev, regmap, spi->irq, config);
+}
+
+static struct spi_driver rv8063_driver = {
+	.driver         = {
+		.name   = "rv8063",
+		.of_match_table = rv8063_of_match,
+	},
+	.probe          = rv8063_probe,
+	.id_table	= rv8063_id,
+};
+
+static int __init rv8063_register_driver(void)
+{
+	return spi_register_driver(&rv8063_driver);
+}
+
+static void __exit rv8063_unregister_driver(void)
+{
+	spi_unregister_driver(&rv8063_driver);
+}
+
+#else
+
+static int __init rv8063_register_driver(void)
+{
+	return 0;
+}
+
+static void __exit rv8063_unregister_driver(void)
+{
+}
+
+#endif /* IS_ENABLED(CONFIG_SPI_MASTER) */
+
 static int __init pcf85063_init(void)
 {
-	return pcf85063_register_driver();
+	int ret;
+
+	ret = pcf85063_register_driver();
+	if (ret)
+		return ret;
+
+	ret = rv8063_register_driver();
+	if (ret)
+		pcf85063_unregister_driver();
+
+	return ret;
 }
 module_init(pcf85063_init);
 
 static void __exit pcf85063_exit(void)
 {
+	rv8063_unregister_driver();
 	pcf85063_unregister_driver();
 }
 module_exit(pcf85063_exit);