arm64: dts: rockchip: add saradc node for rk3568

Add the core dt-node for the rk3568's saradc.
Signed-off-by: NSimon Xue <xxm@rock-chips.com>
Link: https://lore.kernel.org/r/20210705012610.3831-1-xxm@rock-chips.comSigned-off-by: NHeiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3568.dtsi

@@ -754,6 +754,18 @@
 		status = "disabled";
 	};
 
+	saradc: saradc@fe720000 {
+		compatible = "rockchip,rk3568-saradc", "rockchip,rk3399-saradc";
+		reg = <0x0 0xfe720000 0x0 0x100>;
+		interrupts = <GIC_SPI 93 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cru CLK_SARADC>, <&cru PCLK_SARADC>;
+		clock-names = "saradc", "apb_pclk";
+		resets = <&cru SRST_P_SARADC>;
+		reset-names = "saradc-apb";
+		#io-channel-cells = <1>;
+		status = "disabled";
+	};
+
 	pinctrl: pinctrl {
 		compatible = "rockchip,rk3568-pinctrl";
 		rockchip,grf = <&grf>;