boards: nxp: frdm_mcxn947: PWM Support

Updated frdm_mcxn947 to add FlexPWM Support,
including updating the docs file.

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

boards/nxp/frdm_mcxn947/doc/index.rst

@@ -78,6 +78,8 @@ The FRDM-MCXN947 board configuration supports the following hardware features:
 +-----------+------------+-------------------------------------+
 | WATCHDOG  | on-chip    | watchdog                            |
 +-----------+------------+-------------------------------------+
+| PWM       | on-chip    | pwm                                 |
++-----------+------------+-------------------------------------+
 
 Targets available
 ==================

boards/nxp/frdm_mcxn947/frdm_mcxn947-pinctrl.dtsi

@@ -101,4 +101,32 @@
 			input-enable;
 		};
 	};
+
+	pinmux_flexpwm1_pwm0: pinmux_flexpwm1_pwm0 {
+		group0 {
+			pinmux = <PWM1_A0_PIO2_6>,
+				<PWM1_B0_PIO2_7>;
+			slew-rate = "fast";
+			drive-strength = "low";
+		};
+	};
+
+	pinmux_flexpwm1_pwm1: pinmux_flexpwm1_pwm1 {
+		group0 {
+			pinmux = <PWM1_A1_PIO2_4>,
+				<PWM1_B1_PIO2_5>;
+			slew-rate = "fast";
+			drive-strength = "low";
+		};
+	};
+
+	pinmux_flexpwm1_pwm2: pinmux_flexpwm1_pwm2 {
+		group0 {
+			pinmux = <PWM1_A2_PIO2_2>,
+				<PWM1_B2_PIO2_3>;
+			slew-rate = "fast";
+			drive-strength = "low";
+		};
+	};
+
 };

boards/nxp/frdm_mcxn947/frdm_mcxn947.dtsi

@@ -168,3 +168,8 @@
 		status = "okay";
 	};
 };
+
+&flexpwm1_pwm0 {
+	pinctrl-0 = <&pinmux_flexpwm1_pwm0>;
+	pinctrl-names = "default";
+};

boards/nxp/frdm_mcxn947/frdm_mcxn947_mcxn947_cpu0.dts

@@ -28,6 +28,7 @@
 
 	aliases{
 		watchdog0 = &wwdt0;
+		pwm-0 = &flexpwm1_pwm0;
 	};
 };
 
@@ -132,3 +133,7 @@
 &wwdt0 {
 	status = "okay";
 };
+
+&flexpwm1_pwm0 {
+	status = "okay";
+};

boards/nxp/frdm_mcxn947/frdm_mcxn947_mcxn947_cpu0.yaml

@@ -21,4 +21,5 @@ supported:
   - dac
   - i2c
   - watchdog
+  - pwm
 vendor: nxp