boards: nxp: frdm_mcxa153: Support lptmr for NXP frdm_mcxa153 board

Support lptmr for NXP frdm_mcxa153 board.
Test using tests/drivers/counter/counter_basic_api.

Signed-off-by: Neil Chen <cheng.chen_1@nxp.com>

Author: NeilChen93

boards/nxp/frdm_mcxa153/board.c

@@ -133,6 +133,25 @@ void board_early_init_hook(void)
 	CLOCK_AttachClk(kFRO12M_to_LPSPI1);
 #endif
 
+#if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(lptmr0))
+
+/*
+ * Clock Select Decides what input source the lptmr will clock from
+ *
+ * 0 <- Reserved
+ * 1 <- 16K FRO
+ * 2 <- Reserved
+ * 3 <- Combination of clocks configured in MRCC_LPTMR0_CLKSEL[MUX] field
+ */
+#if DT_PROP(DT_NODELABEL(lptmr0), clk_source) == 0x1
+	CLOCK_SetupFRO16KClocking(kCLKE_16K_SYSTEM | kCLKE_16K_COREMAIN);
+#elif DT_PROP(DT_NODELABEL(lptmr0), clk_source) == 0x3
+	CLOCK_SetClockDiv(kCLOCK_DivLPTMR0, 1u);
+	CLOCK_AttachClk(kFRO12M_to_LPTMR0);
+#endif /* DT_PROP(DT_NODELABEL(lptmr0), clk_source) */
+
+#endif
+
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(lpuart0))
 	CLOCK_SetClockDiv(kCLOCK_DivLPUART0, 1u);
 	CLOCK_AttachClk(kFRO12M_to_LPUART0);

boards/nxp/frdm_mcxa153/frdm_mcxa153.dts

@@ -148,6 +148,10 @@
 	pinctrl-names = "default";
 };
 
+&lptmr0 {
+	status = "okay";
+};
+
 &lpuart0 {
 	status = "okay";
 	current-speed = <115200>;