ARM: dts: r7s72100: add rtc to device tree

Add the realtime clock device node.
Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r7s72100.dtsi

@@ -563,4 +563,18 @@ ostm1: timer@fcfec400 {
 		power-domains = <&cpg_clocks>;
 		status = "disabled";
 	};
+
+	rtc: rtc@fcff1000 {
+		compatible = "renesas,r7s72100-rtc", "renesas,sh-rtc";
+		reg = <0xfcff1000 0x2e>;
+		interrupts = <GIC_SPI 276 IRQ_TYPE_EDGE_RISING
+			      GIC_SPI 277 IRQ_TYPE_EDGE_RISING
+			      GIC_SPI 278 IRQ_TYPE_EDGE_RISING>;
+		interrupt-names = "alarm", "period", "carry";
+		clocks = <&mstp6_clks R7S72100_CLK_RTC>, <&rtc_x1_clk>,
+			 <&rtc_x3_clk>, <&extal_clk>;
+		clock-names = "fck", "rtc_x1", "rtc_x3", "extal";
+		power-domains = <&cpg_clocks>;
+		status = "disabled";
+	};
 };