rtc: isl12026: new driver.

The ISL12026 is a combination RTC and EEPROM device with I2C
interface.  The standard RTC driver interface is provided.  The EEPROM
is accessed via the NVMEM interface.

Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/Kconfig

@@ -407,6 +407,16 @@ config RTC_DRV_ISL12022
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-isl12022.
 
+config RTC_DRV_ISL12026
+	tristate "Intersil ISL12026"
+	depends on OF || COMPILE_TEST
+	help
+	  If you say yes here you get support for the
+	  Intersil ISL12026 RTC chip.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-isl12026.
+
 config RTC_DRV_X1205
 	tristate "Xicor/Intersil X1205"
 	help