arm64: dts: rockchip: add RTC to BPI-R2 Pro

Add devicetree node for hym8563 rtc to Bananapi R2 Pro board.
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Link: https://lore.kernel.org/r/20220608161150.58919-3-linux@fw-web.deSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3568-bpi-r2-pro.dts

@@ -389,6 +389,23 @@ regulator-state-mem {
 	};
 };
 
+&i2c3 {
+	status = "okay";
+
+	hym8563: rtc@51 {
+		compatible = "haoyu,hym8563";
+		reg = <0x51>;
+		interrupt-parent = <&gpio0>;
+		interrupts = <RK_PD3 IRQ_TYPE_EDGE_FALLING>;
+		#clock-cells = <0>;
+		clock-frequency = <32768>;
+		clock-output-names = "rtcic_32kout";
+		pinctrl-names = "default";
+		pinctrl-0 = <&hym8563_int>;
+		wakeup-source;
+	};
+};
+
 &i2c5 {
 	/* pin 3 (SDA) + 4 (SCL) of header con2 */
 	status = "disabled";
@@ -411,6 +428,12 @@ green_led_pin: green-led-pin {
 		};
 	};
 
+	hym8563 {
+		hym8563_int: hym8563-int {
+			rockchip,pins = <0 RK_PD3 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	pmic {
 		pmic_int: pmic_int {
 			rockchip,pins =