ARM: dts: Enable S3C RTC on exynos4412-trats2 and exynos5420-arndale-octa

Extend the S3C RTC node with rtc_src clock so it could be operational.
The rtc_src clock is provided by MAX77686 (Trats2) or S2MPS11 (Arndale
Octa).
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

arch/arm/boot/dts/exynos4.dtsi

@@ -266,7 +266,7 @@ watchdog@10060000 {
 		status = "disabled";
 	};
 
-	rtc@10070000 {
+	rtc: rtc@10070000 {
 		compatible = "samsung,s3c6410-rtc";
 		reg = <0x10070000 0x100>;
 		interrupt-parent = <&pmu_system_controller>;

arch/arm/boot/dts/exynos4412-trats2.dts

@@ -16,6 +16,7 @@
 #include "exynos4412.dtsi"
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/clock/maxim,max77686.h>
 
 / {
 	model = "Samsung Trats 2 based on Exynos4412";
@@ -214,7 +215,7 @@ i2c@138D0000 {
 		pinctrl-names = "default";
 		status = "okay";
 
-		max77686_pmic@09 {
+		max77686: max77686_pmic@09 {
 			compatible = "maxim,max77686";
 			interrupt-parent = <&gpx0>;
 			interrupts = <7 0>;
@@ -1304,3 +1305,9 @@ sleep3: sleep-states {
 		PIN_SLP(gpv4-0, INPUT, DOWN);
 	};
 };
+
+&rtc {
+	status = "okay";
+	clocks = <&clock CLK_RTC>, <&max77686 MAX77686_CLK_AP>;
+	clock-names = "rtc", "rtc_src";
+};

arch/arm/boot/dts/exynos5420-arndale-octa.dts

@@ -13,6 +13,7 @@
 #include "exynos5420.dtsi"
 #include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/clock/samsung,s2mps11.h>
 
 / {
 	model = "Insignal Arndale Octa evaluation board based on EXYNOS5420";
@@ -38,10 +39,6 @@ oscclk {
 		};
 	};
 
-	rtc@101E0000 {
-		status = "okay";
-	};
-
 	codec@11000000 {
 		samsung,mfc-r = <0x43000000 0x800000>;
 		samsung,mfc-l = <0x51000000 0x800000>;
@@ -387,3 +384,9 @@ s2mps11_irq: s2mps11-irq {
 		samsung,pin-drv = <0>;
 	};
 };
+
+&rtc {
+	status = "okay";
+	clocks = <&clock CLK_RTC>, <&s2mps11_osc S2MPS11_CLK_AP>;
+	clock-names = "rtc", "rtc_src";
+};