boards: frdm_mcxc242: Add counters support

mcxc242 has lptmr, pit and rtc counters, but it is not documented and
not listed in frdm_mcxc242.yaml.
Add the counters to board documentation, to the yaml file, and enable
it explicitly in board dts. Set rtc clock to 32 kHz oscillator.

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

Author: michal-smola

boards/nxp/frdm_mcxc242/doc/index.rst

@@ -70,6 +70,12 @@ The ``frdm_mcxc242`` board target supports the following hardware features:
 +-----------+------------+-------------------------------------+
 | ADC       | on-chip    | adc                                 |
 +-----------+------------+-------------------------------------+
+| LPTMR     | on-chip    | counter                             |
++-----------+------------+-------------------------------------+
+| PIT       | on-chip    | counter                             |
++-----------+------------+-------------------------------------+
+| RTC       | on-chip    | counter                             |
++-----------+------------+-------------------------------------+
 
 
 Targets available

boards/nxp/frdm_mcxc242/frdm_mcxc242.dts

@@ -87,7 +87,7 @@
 
 &sim {
 	pllfll-select = <KINETIS_SIM_PLLFLLSEL_MCGPLLCLK>;
-	er32k-select = <KINETIS_SIM_ER32KSEL_LPO1KHZ>;
+	er32k-select = <KINETIS_SIM_ER32KSEL_OSC32KCLK>;
 };
 
 &cpu0 {
@@ -153,3 +153,23 @@ i2c1: &i2c1 {
 	pinctrl-0 = <&pinmux_adc0>;
 	pinctrl-names = "default";
 };
+
+&lptmr0 {
+	status = "okay";
+};
+
+&rtc {
+	status = "okay";
+};
+
+&pit0 {
+	status = "okay";
+};
+
+&pit0_channel0 {
+	status = "okay";
+};
+
+&pit0_channel1 {
+	status = "okay";
+};

boards/nxp/frdm_mcxc242/frdm_mcxc242.yaml

@@ -19,6 +19,7 @@ supported:
   - i2c
   - pwm
   - adc
+  - counter
 testing:
   ignore_tags:
     - net