rtc: add AB-RTCMC-32.768kHz-EOZ9 RTC support

This patch adds support for AB-RTCMC-32.768kHz-EOZ9 RTC/Calendar
module with I2C interface.

Signed-off-by: Artem Panfilov <panfilov.artyom@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 5d155ce..29e8974 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -185,6 +185,16 @@
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-ab-b5ze-s3.
 
+config RTC_DRV_ABEOZ9
+	select REGMAP_I2C
+	tristate "Abracon AB-RTCMC-32.768kHz-EOZ9"
+	help
+	  If you say yes here you get support for the Abracon
+	  AB-RTCMC-32.768kHz-EOA9 I2C RTC chip.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-ab-e0z9.
+
 config RTC_DRV_ABX80X
 	tristate "Abracon ABx80x"
 	select WATCHDOG_CORE if WATCHDOG