dts: Add device tree support for RTC

Add rtc0 node to zynqmp.dtsi to enable RTC support.
Introduce alarms-count parameter to support alarm test cases.
This parameter is added to the Device Tree so test cases can
read its value and use it during testing. The IP supports only
a single alarm count.

Signed-off-by: Balanakakamal V <[email protected]>
Signed-off-by: Harini T <[email protected]>

Author: balanakv

dts/arm/xilinx/zynqmp.dtsi

@@ -97,6 +97,16 @@
 			reg = <0xff140000 0x1000>;
 		};
 
+		rtc0: rtc@ffa60000 {
+			compatible = "xlnx,zynqmp-rtc";
+			status = "disabled";
+			reg = <0xffa60000 0x100>;
+			interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL IRQ_DEFAULT_PRIORITY>,
+				     <GIC_SPI 27 IRQ_TYPE_LEVEL IRQ_DEFAULT_PRIORITY>;
+			interrupt-names = "alarm", "sec";
+			alarms-count = <1>;
+		};
+
 		gem0: ethernet@ff0b0000 {
 			compatible = "xlnx,gem";
 			reg = <0xff0b0000 0x1000>,