ARM: dts: rockchip: add saradc support for rv1108

Add saradc device tree node for rv1108 soc
Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rv1108.dtsi

@@ -214,6 +214,17 @@ watchdog: wdt@10360000 {
 		status = "disabled";
 	};
 
+	adc: adc@1038c000 {
+		compatible = "rockchip,rv1108-saradc", "rockchip,rk3399-saradc";
+		reg = <0x1038c000 0x100>;
+		interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
+		#io-channel-cells = <1>;
+		clock-frequency = <1000000>;
+		clocks = <&cru SCLK_SARADC>, <&cru PCLK_SARADC>;
+		clock-names = "saradc", "apb_pclk";
+		status = "disabled";
+	};
+
 	i2c0: i2c@20000000 {
 		compatible = "rockchip,rv1108-i2c";
 		reg = <0x20000000 0x1000>;