drivers: timer: silabs_sleeptimer: Use chosen node

Use the `silabs,sleeptimer` chosen node instead of a devicetree
compatible to select the devicetree node for the RTC.

Signed-off-by: Aksel Skauge Mellbye <[email protected]>

Author: asmellby

drivers/timer/Kconfig.silabs

@@ -1,10 +1,12 @@
 # Copyright (c) 2024 Silicon Laboratories Inc.
 # SPDX-License-Identifier: Apache-2.0
 
+DT_CHOSEN_SILABS_SLEEPTIMER := silabs,sleeptimer
+
 config SILABS_SLEEPTIMER_TIMER
 	bool "Silabs Sleeptimer system clock driver"
 	depends on SOC_FAMILY_SILABS_S2 || SOC_FAMILY_SILABS_SIWX91X
-	depends on DT_HAS_SILABS_GECKO_STIMER_ENABLED
+	depends on $(dt_chosen_enabled,$(DT_CHOSEN_SILABS_SLEEPTIMER))
 	select SILABS_SISDK_SLEEPTIMER
 	select TICKLESS_CAPABLE
 	select TIMER_READS_ITS_FREQUENCY_AT_RUNTIME

drivers/timer/silabs_sleeptimer_timer.c

@@ -22,7 +22,7 @@ LOG_MODULE_REGISTER(silabs_sleeptimer_timer);
 /* Maximum time interval between timer interrupts (in hw_cycles) */
 #define MAX_TIMEOUT_CYC (UINT32_MAX >> 1)
 
-#define DT_RTC DT_COMPAT_GET_ANY_STATUS_OKAY(silabs_gecko_stimer)
+#define DT_RTC DT_CHOSEN(silabs_sleeptimer)
 
 /* Ensure interrupt names don't expand to register interface struct pointers */
 #undef RTCC