[D18] add RTC PCF2123 support

arch/arm64/boot/dts/seco/seco-imx8mp-d18.dts

@@ -141,11 +141,21 @@
 &ecspi2 {
 	#address-cells = <1>;
 	#size-cells = <0>;
-	fsl,spi-num-chipselects = <1>;
-	pinctrl-names = "default";
-	pinctrl-0 = <&pinctrl_ecspi2 &pinctrl_ecspi2_cs>;
-	cs-gpios = <&gpio5 13 GPIO_ACTIVE_LOW>;
+	fsl,spi-num-chipselects = <3>;
+	pinctrl-names = "default","default-gpio";
+	pinctrl-0 = <&pinctrl_ecspi2>, <&pinctrl_ecspi2_cs>;
+	cs-gpios = <&gpio3 19 GPIO_ACTIVE_LOW>, <&gpio5 13 GPIO_ACTIVE_LOW>, <&gpio3 20 GPIO_ACTIVE_LOW>;
 	status = "okay";
+
+	rtc: pcf2123@0 {
+		compatible = "nxp,rtc-pcf2123";
+		reg = <0>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		spi-max-frequency = <1000000>;
+		spi-cs-high;
+		status = "okay";
+	};
 };
 
 &eqos {
@@ -647,6 +657,8 @@
 
 	pinctrl_ecspi2_cs: ecspi2cs {
 		fsl,pins = <
+			MX8MP_IOMUXC_SAI5_RXFS__GPIO3_IO19		0x40000
+			MX8MP_IOMUXC_SAI5_RXC__GPIO3_IO20		0x40000
 			MX8MP_IOMUXC_ECSPI2_SS0__GPIO5_IO13		0x40000
 		>;
 	};