soc: nxp: mcxw2xx: Improve OS tick timer selection

When os_timer is enabled in dts, then os_timer will be used as
OS tick timer.

To make systick as the default OS tick timer, currently os_timer
is not enabled in dts. When users want to use os_timer as
OS tick timer, they need to override the dts.

Improve the method, enable the os_timer is dts, but not enable
in Kconfig by default. If need to use os_timer as OS tick, just pass
CONFIG_MCUX_OS_TIMER=y

Signed-off-by: Jason Yu <zejiang.yu@nxp.com>

Author: zejiang0jason

boards/nxp/frdm_mcxw23/frdm_mcxw23_common.dtsi

@@ -176,15 +176,14 @@
 	pinctrl-names = "default";
 };
 
-/*
- * MCXW23 FRDM board uses SYSTICK timer as the kernel timer.
- * In case we need to switch to OS timer, then
- * replace &systick with &os_timer
- */
 &systick {
 	status = "okay";
 };
 
+&os_timer {
+	status = "okay";
+};
+
 &wwdt0 {
 	status = "okay";
 };

boards/nxp/mcxw23_evk/mcxw23_evk_common.dtsi

@@ -156,15 +156,14 @@
 	pinctrl-names = "default";
 };
 
-/*
- * MCXW23 EVK board uses SYSTICK timer as the kernel timer.
- * In case we need to switch to OS timer, then
- * replace &systick with &os_timer
- */
 &systick {
 	status = "okay";
 };
 
+&os_timer {
+	status = "okay";
+};
+
 &wwdt0 {
 	status = "okay";
 };

soc/nxp/mcx/mcxw/mcxw2xx/Kconfig.defconfig

@@ -4,6 +4,12 @@
 
 if SOC_SERIES_MCXW2XX
 
+# MCXW23 uses SYSTICK timer as the kernel timer by default.
+# In case we need to switch to OS timer, then
+# define CONFIG_MCUX_OS_TIMER=y
+config MCUX_OS_TIMER
+	default n
+
 config CORTEX_M_SYSTICK
 	default n if MCUX_OS_TIMER