boards: frdm_mcxc242: Add adc support

frdm_mcxc242 board does not have adc configured and enabled. Configure
and enable it. Update documentation.

Signed-off-by: Michal Smola <[email protected]>

Author: michal-smola

boards/nxp/frdm_mcxc242/doc/index.rst

@@ -68,6 +68,8 @@ The ``frdm_mcxc242`` board target supports the following hardware features:
 +-----------+------------+-------------------------------------+
 | PWM       | on-chip    | pwm                                 |
 +-----------+------------+-------------------------------------+
+| ADC       | on-chip    | adc                                 |
++-----------+------------+-------------------------------------+
 
 
 Targets available

boards/nxp/frdm_mcxc242/frdm_mcxc242-pinctrl.dtsi

@@ -41,4 +41,12 @@
 			slew-rate = "slow";
 		};
 	};
+	pinmux_adc0: pinmux_adc0 {
+		group0 {
+			pinmux = <ADC0_SE0_PTE20>,
+				<ADC0_SE1_PTE16>;
+			drive-strength = "low";
+			slew-rate = "slow";
+		};
+	};
 };

boards/nxp/frdm_mcxc242/frdm_mcxc242.dts

@@ -147,3 +147,9 @@ i2c1: &i2c1 {
 	pinctrl-0 = <&pinmux_tpm2>;
 	pinctrl-names = "default";
 };
+
+&adc0 {
+	status = "okay";
+	pinctrl-0 = <&pinmux_adc0>;
+	pinctrl-names = "default";
+};

boards/nxp/frdm_mcxc242/frdm_mcxc242.yaml

@@ -18,6 +18,7 @@ supported:
   - gpio
   - i2c
   - pwm
+  - adc
 testing:
   ignore_tags:
     - net