drivers: timer: nrf_grtc_timer: Align Zephyr to new AUTOEN read manner

The new GRTC reading manner of the SYSCOUNTER uses hardware mechanism which
allows to keep it alive when any of CPUs is not sleeping. Otherwise
the SYSCOUNTER goes into sleep mode. Thus there is no
longer need to maintain the `CONFIG_NRF_GRTC_SLEEP_ALLOWED` symbol, however
if the user wants to have the SYSCOUNTER enabled all the time the
`CONFIG_NRF_GRTC_ALWAYS_ON` can be used instead.
The nrfx_grtc  driver no longer provides the `wakeup-read-sleep` reading
manner.
Also setting the GRTC clock source is performed by the nrfx_grtc driver so
it has been removed from the `sys_clock_driver_init()` function.

Signed-off-by: Adam Kondraciuk <adam.kondraciuk@nordicsemi.no>

drivers/timer/Kconfig.nrf_grtc

@@ -15,11 +15,10 @@ menuconfig NRF_GRTC_TIMER
 
 if NRF_GRTC_TIMER
 
-config NRF_GRTC_SLEEP_ALLOWED
-	def_bool y
-	depends on POWEROFF
+config NRF_GRTC_ALWAYS_ON
+	bool
 	help
-	  This feature allows GRTC SYSCOUNTER to go to sleep state.
+	  Always keep the SYSCOUNTER active even if the CPU is in sleep mode.
 
 config NRF_GRTC_TIMER_APP_DEFINED_INIT
 	bool "Application defines GRTC initialization"
@@ -44,7 +43,7 @@ config NRF_GRTC_TIMER_CLOCK_MANAGEMENT
 config NRF_GRTC_SYSCOUNTER_SLEEP_MINIMUM_LATENCY
 	int
 	default 1000
-	depends on NRF_GRTC_SLEEP_ALLOWED
+	depends on POWEROFF
 	help
 	  The value (in us) ensures that the wakeup event will not fire
 	  too early. In other words, applying SYSCOUNTER sleep state for less than

drivers/timer/nrf_grtc_timer.c

@@ -367,7 +367,7 @@ int z_nrf_grtc_timer_capture_read(int32_t chan, uint64_t *captured_time)
 	return 0;
 }
 
-#if defined(CONFIG_NRF_GRTC_SLEEP_ALLOWED) && defined(CONFIG_NRF_GRTC_START_SYSCOUNTER)
+#if defined(CONFIG_POWEROFF) && defined(CONFIG_NRF_GRTC_START_SYSCOUNTER)
 int z_nrf_grtc_wakeup_prepare(uint64_t wake_time_us)
 {
 	nrfx_err_t err_code;
@@ -432,7 +432,7 @@ int z_nrf_grtc_wakeup_prepare(uint64_t wake_time_us)
 	k_spin_unlock(&lock, key);
 	return 0;
 }
-#endif /* CONFIG_NRF_GRTC_SLEEP_ALLOWED */
+#endif /* CONFIG_POWEROFF */
 
 uint32_t sys_clock_cycle_get_32(void)
 {
@@ -465,12 +465,6 @@ static int sys_clock_driver_init(void)
 {
 	nrfx_err_t err_code;
 
-#if defined(CONFIG_NRF_GRTC_TIMER_CLOCK_MANAGEMENT) &&                                             \
-	(defined(NRF_GRTC_HAS_CLKSEL) && (NRF_GRTC_HAS_CLKSEL == 1))
-	/* Use System LFCLK as the low-frequency clock source during initialization. */
-	nrfx_grtc_clock_source_set(NRF_GRTC_CLKSEL_LFCLK);
-#endif
-
 	IRQ_CONNECT(DT_IRQN(GRTC_NODE), DT_IRQ(GRTC_NODE, priority), nrfx_isr,
 		    nrfx_grtc_irq_handler, 0);
 
@@ -513,6 +507,9 @@ static int sys_clock_driver_init(void)
 	nrfx_grtc_clock_source_set(NRF_GRTC_CLKSEL_LFXO);
 #endif
 
+#if defined(CONFIG_NRF_GRTC_ALWAYS_ON)
+	nrfx_grtc_active_request_set(true);
+#endif
 	return 0;
 }
 

modules/hal_nordic/nrfx/nrfx_config.h

@@ -132,9 +132,6 @@
 #ifdef CONFIG_NRF_GRTC_TIMER_CLOCK_MANAGEMENT
 #define NRF_GRTC_HAS_EXTENDED 1
 #endif
-#ifdef CONFIG_NRF_GRTC_SLEEP_ALLOWED
-#define NRFX_GRTC_CONFIG_SLEEP_ALLOWED 1
-#endif
 #ifdef CONFIG_NRF_GRTC_TIMER_AUTO_KEEP_ALIVE
 #define NRFX_GRTC_CONFIG_AUTOEN 1
 #endif

modules/hal_nordic/nrfx/nrfx_config_nrf54l15_enga_application.h

@@ -283,15 +283,6 @@
 #define NRFX_GRTC_ENABLED 0
 #endif
 
-/**
- * @brief NRFX_GRTC_CONFIG_SLEEP_ALLOWED
- *
- * Boolean. Accepted values: 0 and 1.
- */
-#ifndef NRFX_GRTC_CONFIG_SLEEP_ALLOWED
-#define NRFX_GRTC_CONFIG_SLEEP_ALLOWED 0
-#endif
-
 /**
  * @brief NRFX_GRTC_CONFIG_AUTOEN
  *

modules/hal_nordic/nrfx/nrfx_config_nrf54l15_enga_flpr.h

@@ -283,15 +283,6 @@
 #define NRFX_GRTC_ENABLED 0
 #endif
 
-/**
- * @brief NRFX_GRTC_CONFIG_SLEEP_ALLOWED
- *
- * Boolean. Accepted values: 0 and 1.
- */
-#ifndef NRFX_GRTC_CONFIG_SLEEP_ALLOWED
-#define NRFX_GRTC_CONFIG_SLEEP_ALLOWED 0
-#endif
-
 /**
  * @brief NRFX_GRTC_CONFIG_AUTOEN
  *

modules/hal_nordic/nrfx/nrfx_config_nrf9230_engb_application.h

@@ -367,15 +367,6 @@
 #define NRFX_GRTC_ENABLED 0
 #endif
 
-/**
- * @brief NRFX_GRTC_CONFIG_SLEEP_ALLOWED
- *
- * Boolean. Accepted values: 0 and 1.
- */
-#ifndef NRFX_GRTC_CONFIG_SLEEP_ALLOWED
-#define NRFX_GRTC_CONFIG_SLEEP_ALLOWED 0
-#endif
-
 /**
  * @brief NRFX_GRTC_CONFIG_AUTOEN
  *

modules/hal_nordic/nrfx/nrfx_config_nrf9230_engb_ppr.h

@@ -322,15 +322,6 @@
 #define NRFX_GRTC_ENABLED 0
 #endif
 
-/**
- * @brief NRFX_GRTC_CONFIG_SLEEP_ALLOWED
- *
- * Boolean. Accepted values: 0 and 1.
- */
-#ifndef NRFX_GRTC_CONFIG_SLEEP_ALLOWED
-#define NRFX_GRTC_CONFIG_SLEEP_ALLOWED 0
-#endif
-
 /**
  * @brief NRFX_GRTC_CONFIG_AUTOEN
  *

modules/hal_nordic/nrfx/nrfx_config_nrf9230_engb_radiocore.h

@@ -407,15 +407,6 @@
 #define NRFX_GRTC_ENABLED 0
 #endif
 
-/**
- * @brief NRFX_GRTC_CONFIG_SLEEP_ALLOWED
- *
- * Boolean. Accepted values: 0 and 1.
- */
-#ifndef NRFX_GRTC_CONFIG_SLEEP_ALLOWED
-#define NRFX_GRTC_CONFIG_SLEEP_ALLOWED 0
-#endif
-
 /**
  * @brief NRFX_GRTC_CONFIG_AUTOEN
  *

soc/nordic/nrf54l/Kconfig

@@ -86,7 +86,7 @@ if NRF_GRTC_TIMER
 
 config ELV_GRTC_LFXO_ALLOWED
 	bool
-	depends on NRF_GRTC_SLEEP_ALLOWED
+	depends on POWEROFF
 	select EXPERIMENTAL
 	help
 	  This feature allows using ELV mode when GRTC operates with the LFXO as