dts: arm: nxp: Enable RTC Counter for MCXW7X

Enabled the RTC Counter for the MCXW71 and MCXW72.

Signed-off-by: Emilio Benavente <emilio.benavente@nxp.com>

boards/nxp/frdm_mcxw71/doc/index.rst

@@ -60,6 +60,8 @@ The ``frdm_mcxw71`` board target in Zephyr currently supports the following feat
 +-----------+------------+-------------------------------------+
 | LPTMR     | on-chip    | counter                             |
 +-----------+------------+-------------------------------------+
+| RTC       | on-chip    | counter                             |
++-----------+------------+-------------------------------------+
 | BLE       | on-chip    | Bluetooth                           |
 +-----------+------------+-------------------------------------+
 | FLEXCAN   | on-chip    | can                                 |

boards/nxp/frdm_mcxw71/frdm_mcxw71.dts

@@ -176,3 +176,7 @@
 	status = "okay";
 	wakeup-source;
 };
+
+&rtc {
+	status = "okay";
+};

boards/nxp/mcxw72_evk/mcxw72_evk_mcxw727c_cpu0.dts

@@ -134,3 +134,7 @@
 	pinctrl-0 = <&pinmux_lpi2c1>;
 	pinctrl-names = "default";
 };
+
+&rtc {
+	status = "okay";
+};

dts/arm/nxp/nxp_mcxw71.dtsi

@@ -60,3 +60,7 @@
 &smu2 {
 	ranges = <0x0 0x1c0000 DT_SIZE_K(40)>;
 };
+
+&rtc {
+	reg = <0x4002c000 0x50>;
+};

dts/arm/nxp/nxp_mcxw72.dtsi

@@ -53,3 +53,7 @@
 &smu2 {
 	ranges = <0x0 0x1c0000 DT_SIZE_K(80)>;
 };
+
+&rtc {
+	reg = <0x4002c000 0x60>;
+};

dts/arm/nxp/nxp_mcxw7x_common.dtsi

@@ -324,6 +324,15 @@
 		nxp,current-compensation-en;
 		status = "disabled";
 	};
+
+	rtc: rtc@4002c000 {
+		compatible = "nxp,rtc";
+		status = "disabled";
+		interrupts = <32 0>, <33 0>;
+		interrupt-names = "alarm", "seconds";
+		clock-frequency = <32768>;
+		prescaler = <32768>;
+	};
 };
 
 &fast_peripheral0 {