drivers: timer: Enable NXP LPTMR as wakeup-source

mmahadevan108 · mmahadevan108 · commit 0cdea63ca7b4 · 2025-10-06T13:26:20.000-05:00
The NXP LPTMR uses the interrupt number or a dedicated
wakeup signal to wakeup the platform from low power
modes.

Signed-off-by: Mahesh Mahadevan &lt;mahesh.mahadevan@nxp.com&gt;
diff --git a/drivers/timer/mcux_lptmr_timer.c b/drivers/timer/mcux_lptmr_timer.c
@@ -122,6 +122,10 @@ static int sys_clock_driver_init(void)
 	LPTMR_SetTimerPeriod(LPTMR_BASE, CYCLES_PER_TICK);
 	LPTMR_StartTimer(LPTMR_BASE);
 
+#if (DT_INST_PROP(0, wakeup_source))
+	/* Use wakeup-signal property if specified, else use the irq number */
+	NXP_ENABLE_WAKEUP_SIGNAL(DT_INST_PROP_OR(0, wakeup_signal, DT_INST_IRQN(0)));
+#endif
 	return 0;
 }
 
diff --git a/dts/arm/nxp/nxp_mcxw7x_common.dtsi b/dts/arm/nxp/nxp_mcxw7x_common.dtsi
@@ -301,6 +301,8 @@
 		prescaler = <1>;
 		resolution = <32>;
 		status = "disabled";
+		wakeup-source;
+		wakeup-signal = <0>;
 	};
 
 	lptmr1: timer@2e000 {

Original file line number	Diff line number	Diff line change
`@@ -122,6 +122,10 @@ static int sys_clock_driver_init(void)`
`122`	`122`	`LPTMR_SetTimerPeriod(LPTMR_BASE, CYCLES_PER_TICK);`
`123`	`123`	`LPTMR_StartTimer(LPTMR_BASE);`
`124`	`124`
	`125`	`+#if (DT_INST_PROP(0, wakeup_source))`
	`126`	`+ /* Use wakeup-signal property if specified, else use the irq number */`
	`127`	`+ NXP_ENABLE_WAKEUP_SIGNAL(DT_INST_PROP_OR(0, wakeup_signal, DT_INST_IRQN(0)));`
	`128`	`+#endif`
`125`	`129`	`return 0;`
`126`	`130`	`}`
`127`	`131`