drivers: counter: Move nRF TIMER and RTC configuration to device tree

Reduced Kconfig for counter with nRF TIMER and RTC. Added overlays
for TIMER and RTC configuration in the counter test.

Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>

drivers/counter/Kconfig.nrfx

@@ -17,85 +17,30 @@ config COUNTER_TIMER0
 	select COUNTER_NRF_TIMER
 	select NRFX_TIMER0
 
-if COUNTER_TIMER0
-
-config COUNTER_TIMER0_PRESCALER
-	int "Timer prescaler"
-	default 0
-	range 0 9
-	help
-	  Frequency = 16 Mhz / 2^prescaler.
-
-endif #COUNTER_TIMER0
-
 config COUNTER_TIMER1
 	bool "Enable Counter on TIMER1"
 	depends on HAS_HW_NRF_TIMER1
 	select COUNTER_NRF_TIMER
 	select NRFX_TIMER1
 
-if COUNTER_TIMER1
-
-config COUNTER_TIMER1_PRESCALER
-	int "Timer prescaler"
-	default 0
-	range 0 9
-	help
-	  Frequency = 16 Mhz / 2^prescaler.
-
-endif #COUNTER_TIMER1
-
 config COUNTER_TIMER2
 	bool "Enable Counter on TIMER2"
 	depends on HAS_HW_NRF_TIMER2
 	select COUNTER_NRF_TIMER
 	select NRFX_TIMER2
 
-if COUNTER_TIMER2
-
-config COUNTER_TIMER2_PRESCALER
-	int "Timer prescaler"
-	default 0
-	range 0 9
-	help
-	  Frequency = 16 Mhz / 2^prescaler.
-
-endif #COUNTER_TIMER2
-
 config COUNTER_TIMER3
 	bool "Enable Counter on TIMER3"
 	depends on HAS_HW_NRF_TIMER3
 	select COUNTER_NRF_TIMER
 	select NRFX_TIMER3
 
-if COUNTER_TIMER3
-
-config COUNTER_TIMER3_PRESCALER
-	int "Timer prescaler"
-	default 0
-	range 0 9
-	help
-	  Frequency = 16 Mhz / 2^prescaler.
-
-endif #COUNTER_TIMER3
-
 config COUNTER_TIMER4
 	bool "Enable Counter on TIMER4"
 	depends on HAS_HW_NRF_TIMER4
 	select COUNTER_NRF_TIMER
 	select NRFX_TIMER4
 
-if COUNTER_TIMER4
-
-config COUNTER_TIMER4_PRESCALER
-	int "Timer prescaler"
-	default 0
-	range 0 9
-	help
-	  Frequency = 16 Mhz / 2^prescaler.
-
-endif #COUNTER_TIMER4
-
 config COUNTER_RTC0
 	bool "Enable Counter on RTC0"
 	depends on HAS_HW_NRF_RTC0
@@ -103,27 +48,6 @@ config COUNTER_RTC0
 	select COUNTER_NRF_RTC
 	select NRFX_RTC0
 
-if COUNTER_RTC0
-
-config COUNTER_RTC0_PRESCALER
-	int "RTC prescaler"
-	default 0
-	range 0 2047
-	help
-	  Frequency = 32768 / (prescaler+1).
-
-config COUNTER_RTC0_PPI_WRAP
-	bool "Enable PPI wrapping in RTC0"
-	select NRFX_PPI if HAS_HW_NRF_PPI
-	select NRFX_DPPI if HAS_HW_NRF_DPPIC
-	help
-	  If enabled, overflow different than full range (24 bits) is handled
-	  through PPI channel which ensures precise timing. If disabled then
-	  counter is cleared in the interrupt which results in accumulative
-	  error of counter period if top value is different than maximal.
-
-endif #COUNTER_RTC0
-
 config COUNTER_RTC1
 	bool "Enable Counter on RTC1"
 	depends on HAS_HW_NRF_RTC1
@@ -131,50 +55,20 @@ config COUNTER_RTC1
 	select COUNTER_NRF_RTC
 	select NRFX_RTC1
 
-if COUNTER_RTC1
-
-config COUNTER_RTC1_PRESCALER
-	int "RTC prescaler"
-	default 0
-	range 0 2047
-	help
-	  Frequency = 32768 / (prescaler+1).
-
-config COUNTER_RTC1_PPI_WRAP
-	bool "Enable PPI wrapping in RTC1"
-	select NRFX_PPI if HAS_HW_NRF_PPI
-	select NRFX_DPPI if HAS_HW_NRF_DPPIC
-	help
-	  If enabled, overflow different than full range (24 bits) is handled
-	  through PPI channel which ensures precise timing. If disabled then
-	  counter is cleared in the interrupt which results in accumulative
-	  error of counter period if top value is different than maximal.
-
-endif #COUNTER_RTC1
-
 config COUNTER_RTC2
 	bool "Enable Counter on RTC2"
 	depends on HAS_HW_NRF_RTC2
 	select COUNTER_NRF_RTC
 	select NRFX_RTC2
 
-if COUNTER_RTC2
+# Internal flag which detects if PPI wrap feature is enabled for any instance
+if $(dt_int_val,DT_NORDIC_NRF_RTC_0_PPI_WRAP) > 0 || \
+   $(dt_int_val,DT_NORDIC_NRF_RTC_1_PPI_WRAP) > 0 || \
+   $(dt_int_val,DT_NORDIC_NRF_RTC_2_PPI_WRAP) > 0
 
-config COUNTER_RTC2_PRESCALER
+config COUNTER_RTC_WITH_PPI_WRAP
-	int "RTC prescaler"
+	bool
-	default 0
+	default y
-	range 0 2047
-	help
-	  Frequency = 32768 / (prescaler+1).
-
-config COUNTER_RTC2_PPI_WRAP
-	bool "Enable PPI wrapping in RTC2"
 	select NRFX_PPI if HAS_HW_NRF_PPI
 	select NRFX_DPPI if HAS_HW_NRF_DPPIC
-	help
+endif
-	  If enabled, overflow different than full range (24 bits) is handled
-	  through PPI channel which ensures precise timing. If disabled then
-	  counter is cleared in the interrupt which results in accumulative
-	  error of counter period if top value is different than maximal.
-
-endif # COUNTER_RTC2

drivers/counter/counter_nrfx_rtc.c

@@ -18,7 +18,6 @@
 #include <logging/log.h>
 LOG_MODULE_REGISTER(LOG_MODULE_NAME, LOG_LEVEL);
 
-#define RTC_CLOCK 32768
 #define COUNTER_MAX_TOP_VALUE RTC_COUNTER_COUNTER_Msk
 
 #define CC_TO_ID(cc) ((cc) - 1)
@@ -27,16 +26,11 @@ LOG_MODULE_REGISTER(LOG_MODULE_NAME, LOG_LEVEL);
 #define TOP_CH 0
 #define COUNTER_TOP_INT NRFX_RTC_INT_COMPARE0
 
-#define IS_PPI_WRAP_ENABLED() \
-	(IS_ENABLED(CONFIG_COUNTER_RTC0_PPI_WRAP) || \
-	 IS_ENABLED(CONFIG_COUNTER_RTC1_PPI_WRAP) || \
-	 IS_ENABLED(CONFIG_COUNTER_RTC2_PPI_WRAP))
-
 struct counter_nrfx_data {
 	counter_top_callback_t top_cb;
 	void *top_user_data;
 	u32_t top;
-#if IS_PPI_WRAP_ENABLED()
+#if CONFIG_COUNTER_RTC_WITH_PPI_WRAP
 	u8_t ppi_ch;
 #endif
 };
@@ -50,7 +44,7 @@ struct counter_nrfx_config {
 	struct counter_config_info info;
 	struct counter_nrfx_ch_data *ch_data;
 	nrfx_rtc_t rtc;
-#if IS_PPI_WRAP_ENABLED()
+#if CONFIG_COUNTER_RTC_WITH_PPI_WRAP
 	bool use_ppi;
 #endif
 	LOG_INSTANCE_PTR_DECLARE(log);
@@ -200,7 +194,7 @@ static void event_handler(nrfx_rtc_int_type_t int_type, void *p_context)
 	if (int_type == COUNTER_TOP_INT) {
 		/* Manually reset counter if top value is different than max. */
 		if ((data->top != COUNTER_MAX_TOP_VALUE)
-#if IS_PPI_WRAP_ENABLED()
+#if CONFIG_COUNTER_RTC_WITH_PPI_WRAP
 		    && !get_nrfx_config(dev)->use_ppi
 #endif
 		    ) {
@@ -221,7 +215,7 @@ static void event_handler(nrfx_rtc_int_type_t int_type, void *p_context)
 
 static int ppi_setup(struct device *dev)
 {
-#if IS_PPI_WRAP_ENABLED()
+#if CONFIG_COUNTER_RTC_WITH_PPI_WRAP
 	const struct counter_nrfx_config *nrfx_config = get_nrfx_config(dev);
 	struct counter_nrfx_data *data = get_dev_data(dev);
 	const nrfx_rtc_t *rtc = &nrfx_config->rtc;
@@ -259,7 +253,7 @@ static int ppi_setup(struct device *dev)
 	(void)nrfx_ppi_channel_assign(data->ppi_ch, evt, task);
 	(void)nrfx_ppi_channel_enable(data->ppi_ch);
 #endif
-#endif /* IS_PPI_WRAP_ENABLED() */
+#endif /* CONFIG_COUNTER_RTC_WITH_PPI_WRAP */
 	return 0;
 }
 
@@ -322,6 +316,9 @@ static const struct counter_driver_api counter_nrfx_driver_api = {
 };
 
 #define COUNTER_NRFX_RTC_DEVICE(idx)					       \
+	BUILD_ASSERT_MSG((DT_NORDIC_NRF_RTC_RTC_##idx##_PRESCALER - 1) <=      \
+			RTC_PRESCALER_PRESCALER_Msk,			       \
+			"RTC prescaler out of range");			       \
 	DEVICE_DECLARE(rtc_##idx);					       \
 	static void rtc_##idx##_handler(nrfx_rtc_int_type_t int_type)	       \
 	{								       \
@@ -333,7 +330,8 @@ static const struct counter_driver_api counter_nrfx_driver_api = {
 			    DT_NORDIC_NRF_RTC_RTC_##idx##_IRQ_PRIORITY,	       \
 			    nrfx_isr, nrfx_rtc_##idx##_irq_handler, 0);	       \
 		const nrfx_rtc_config_t config = {			       \
-			.prescaler = CONFIG_COUNTER_RTC##idx##_PRESCALER,      \
+			.prescaler =					       \
+				DT_NORDIC_NRF_RTC_RTC_##idx##_PRESCALER - 1,   \
 		};							       \
 		return init_rtc(dev, &config, rtc_##idx##_handler);	       \
 	}								       \
@@ -344,14 +342,14 @@ static const struct counter_driver_api counter_nrfx_driver_api = {
 	static const struct counter_nrfx_config nrfx_counter_##idx##z_config = {\
 		.info = {						       \
 			.max_top_value = COUNTER_MAX_TOP_VALUE,		       \
-			.freq = RTC_CLOCK /				       \
+			.freq = DT_NORDIC_NRF_RTC_RTC_##idx##_CLOCK_FREQUENCY /\
-				(CONFIG_COUNTER_RTC##idx##_PRESCALER + 1),     \
+				(DT_NORDIC_NRF_RTC_RTC_##idx##_PRESCALER),     \
 			.count_up = true,				       \
 			.channels = CC_TO_ID(RTC##idx##_CC_NUM)		       \
 		},							       \
 		.ch_data = counter##idx##_ch_data,			       \
 		.rtc = NRFX_RTC_INSTANCE(idx),				       \
-		COND_CODE_1(CONFIG_COUNTER_RTC##idx##_PPI_WRAP,		       \
+		COND_CODE_1(DT_NORDIC_NRF_RTC_RTC_##idx##_PPI_WRAP,	       \
 			    (.use_ppi = true,), ())			       \
 		LOG_INSTANCE_PTR_INIT(log, LOG_MODULE_NAME, idx)	       \
 	};								       \

drivers/counter/counter_nrfx_timer.c

@@ -252,13 +252,17 @@ static const struct counter_driver_api counter_nrfx_driver_api = {
 };
 
 #define COUNTER_NRFX_TIMER_DEVICE(idx)					       \
+	BUILD_ASSERT_MSG(DT_NORDIC_NRF_TIMER_TIMER_##idx##_PRESCALER <=	       \
+			TIMER_PRESCALER_PRESCALER_Msk,			       \
+			"TIMER prescaler out of range");		       \
 	static int counter_##idx##_init(struct device *dev)		       \
 	{								       \
 		IRQ_CONNECT(DT_NORDIC_NRF_TIMER_TIMER_##idx##_IRQ,	       \
 			    DT_NORDIC_NRF_TIMER_TIMER_##idx##_IRQ_PRIORITY,    \
 			    nrfx_isr, nrfx_timer_##idx##_irq_handler, 0);      \
 		const nrfx_timer_config_t config = {			       \
-			.frequency = CONFIG_COUNTER_TIMER##idx##_PRESCALER,    \
+			.frequency =					       \
+				DT_NORDIC_NRF_TIMER_TIMER_##idx##_PRESCALER,   \
 			.mode      = NRF_TIMER_MODE_TIMER,		       \
 			.bit_width = (TIMER##idx##_MAX_SIZE == 32) ?	       \
 					NRF_TIMER_BIT_WIDTH_32 :	       \
@@ -276,7 +280,7 @@ static const struct counter_driver_api counter_nrfx_driver_api = {
 			.max_top_value = (TIMER##idx##_MAX_SIZE == 32) ?       \
 					0xffffffff : 0x0000ffff,	       \
 			.freq = TIMER_CLOCK /				       \
-				(1 << CONFIG_COUNTER_TIMER##idx##_PRESCALER),  \
+			   (1 << DT_NORDIC_NRF_TIMER_TIMER_##idx##_PRESCALER), \
 			.count_up = true,				       \
 			.channels = CC_TO_ID(TIMER##idx##_CC_NUM),	       \
 		},							       \

dts/arm/nordic/nrf51822.dtsi

@@ -154,6 +154,8 @@
 			reg = <0x4000b000 0x1000>;
 			interrupts = <11 1>;
 			status = "ok";
+			clock-frequency = <32768>;
+			prescaler = <1>;
 			label = "RTC_0";
 		};
 
@@ -162,6 +164,8 @@
 			reg = <0x40011000 0x1000>;
 			interrupts = <17 1>;
 			status = "ok";
+			clock-frequency = <32768>;
+			prescaler = <1>;
 			label = "RTC_1";
 		};
 
@@ -170,6 +174,7 @@
 			status = "ok";
 			reg = <0x40008000 0x1000>;
 			interrupts = <8 1>;
+			prescaler = <0>;
 			label = "TIMER_0";
 		};
 
@@ -178,6 +183,7 @@
 			status = "ok";
 			reg = <0x40009000 0x1000>;
 			interrupts = <9 1>;
+			prescaler = <0>;
 			label = "TIMER_1";
 		};
 
@@ -186,6 +192,7 @@
 			status = "ok";
 			reg = <0x4000a000 0x1000>;
 			interrupts = <10 1>;
+			prescaler = <0>;
 			label = "TIMER_2";
 		};
 

dts/arm/nordic/nrf52810.dtsi

@@ -140,6 +140,8 @@
 			reg = <0x4000b000 0x1000>;
 			interrupts = <11 1>;
 			status = "ok";
+			clock-frequency = <32768>;
+			prescaler = <1>;
 			label = "RTC_0";
 		};
 
@@ -148,6 +150,8 @@
 			reg = <0x40011000 0x1000>;
 			interrupts = <17 1>;
 			status = "ok";
+			clock-frequency = <32768>;
+			prescaler = <1>;
 			label = "RTC_1";
 		};
 
@@ -156,6 +160,7 @@
 			status = "ok";
 			reg = <0x40008000 0x1000>;
 			interrupts = <8 1>;
+			prescaler = <0>;
 			label = "TIMER_0";
 		};
 
@@ -164,6 +169,7 @@
 			status = "ok";
 			reg = <0x40009000 0x1000>;
 			interrupts = <9 1>;
+			prescaler = <0>;
 			label = "TIMER_1";
 		};
 
@@ -172,6 +178,7 @@
 			status = "ok";
 			reg = <0x4000a000 0x1000>;
 			interrupts = <10 1>;
+			prescaler = <0>;
 			label = "TIMER_2";
 		};
 

dts/arm/nordic/nrf52811.dtsi

@@ -158,6 +158,8 @@
 			reg = <0x4000b000 0x1000>;
 			interrupts = <11 1>;
 			status = "ok";
+			clock-frequency = <32768>;
+			prescaler = <1>;
 			label = "RTC_0";
 		};
 
@@ -166,6 +168,8 @@
 			reg = <0x40011000 0x1000>;
 			interrupts = <17 1>;
 			status = "ok";
+			clock-frequency = <32768>;
+			prescaler = <1>;
 			label = "RTC_1";
 		};
 
@@ -174,6 +178,7 @@
 			status = "ok";
 			reg = <0x40008000 0x1000>;
 			interrupts = <8 1>;
+			prescaler = <0>;
 			label = "TIMER_0";
 		};
 
@@ -182,6 +187,7 @@
 			status = "ok";
 			reg = <0x40009000 0x1000>;
 			interrupts = <9 1>;
+			prescaler = <0>;
 			label = "TIMER_1";
 		};
 
@@ -190,6 +196,7 @@
 			status = "ok";
 			reg = <0x4000a000 0x1000>;
 			interrupts = <10 1>;
+			prescaler = <0>;
 			label = "TIMER_2";
 		};
 

dts/arm/nordic/nrf52832.dtsi

@@ -196,6 +196,8 @@
 			reg = <0x4000b000 0x1000>;
 			interrupts = <11 1>;
 			status = "ok";
+			clock-frequency = <32768>;
+			prescaler = <1>;
 			label = "RTC_0";
 		};
 
@@ -204,6 +206,8 @@
 			reg = <0x40011000 0x1000>;
 			interrupts = <17 1>;
 			status = "ok";
+			clock-frequency = <32768>;
+			prescaler = <1>;
 			label = "RTC_1";
 		};
 
@@ -212,6 +216,8 @@
 			reg = <0x40024000 0x1000>;
 			interrupts = <36 1>;
 			status = "ok";
+			clock-frequency = <32768>;
+			prescaler = <1>;
 			label = "RTC_2";
 		};
 
@@ -220,6 +226,7 @@
 			status = "ok";
 			reg = <0x40008000 0x1000>;
 			interrupts = <8 1>;
+			prescaler = <0>;
 			label = "TIMER_0";
 		};
 
@@ -228,6 +235,7 @@
 			status = "ok";
 			reg = <0x40009000 0x1000>;
 			interrupts = <9 1>;
+			prescaler = <0>;
 			label = "TIMER_1";
 		};
 
@@ -236,6 +244,7 @@
 			status = "ok";
 			reg = <0x4000a000 0x1000>;
 			interrupts = <10 1>;
+			prescaler = <0>;
 			label = "TIMER_2";
 		};
 
@@ -244,6 +253,7 @@
 			status = "ok";
 			reg = <0x4001a000 0x1000>;
 			interrupts = <26 1>;
+			prescaler = <0>;
 			label = "TIMER_3";
 		};
 
@@ -252,6 +262,7 @@
 			status = "ok";
 			reg = <0x4001b000 0x1000>;
 			interrupts = <27 1>;
+			prescaler = <0>;
 			label = "TIMER_4";
 		};
 

dts/arm/nordic/nrf52840.dtsi

@@ -240,6 +240,8 @@
 			reg = <0x4000b000 0x1000>;
 			interrupts = <11 1>;
 			status = "ok";
+			clock-frequency = <32768>;
+			prescaler = <1>;
 			label = "RTC_0";
 		};
 
@@ -248,6 +250,8 @@
 			reg = <0x40011000 0x1000>;
 			interrupts = <17 1>;
 			status = "ok";
+			clock-frequency = <32768>;
+			prescaler = <1>;
 			label = "RTC_1";
 		};
 
@@ -256,6 +260,8 @@
 			reg = <0x40024000 0x1000>;
 			interrupts = <36 1>;
 			status = "ok";
+			clock-frequency = <32768>;
+			prescaler = <1>;
 			label = "RTC_2";
 		};
 
@@ -264,6 +270,7 @@
 			status = "ok";
 			reg = <0x40008000 0x1000>;
 			interrupts = <8 1>;
+			prescaler = <0>;
 			label = "TIMER_0";
 		};
 
@@ -272,6 +279,7 @@
 			status = "ok";
 			reg = <0x40009000 0x1000>;
 			interrupts = <9 1>;
+			prescaler = <0>;
 			label = "TIMER_1";
 		};
 
@@ -280,6 +288,7 @@
 			status = "ok";
 			reg = <0x4000a000 0x1000>;
 			interrupts = <10 1>;
+			prescaler = <0>;
 			label = "TIMER_2";
 		};
 
@@ -288,6 +297,7 @@
 			status = "ok";
 			reg = <0x4001a000 0x1000>;
 			interrupts = <26 1>;
+			prescaler = <0>;
 			label = "TIMER_3";
 		};
 
@@ -296,6 +306,7 @@
 			status = "ok";
 			reg = <0x4001b000 0x1000>;
 			interrupts = <27 1>;
+			prescaler = <0>;
 			label = "TIMER_4";
 		};
 

dts/arm/nordic/nrf9160_common.dtsi

@@ -198,6 +198,8 @@ rtc0: rtc@14000 {
 	reg = <0x14000 0x1000>;
 	interrupts = <20 1>;
 	status = "ok";
+	clock-frequency = <32768>;
+	prescaler = <1>;
 	label = "RTC_0";
 };
 
@@ -206,6 +208,8 @@ rtc1: rtc@15000 {
 	reg = <0x15000 0x1000>;
 	interrupts = <21 1>;
 	status = "ok";
+	clock-frequency = <32768>;
+	prescaler = <1>;
 	label = "RTC_1";
 };
 
@@ -237,6 +241,7 @@ timer0: timer@f000 {
 	status = "disabled";
 	reg = <0xf000 0x1000>;
 	interrupts = <15 1>;
+	prescaler = <0>;
 	label = "TIMER_0";
 };
 
@@ -245,6 +250,7 @@ timer1: timer@10000 {
 	status = "disabled";
 	reg = <0x10000 0x1000>;
 	interrupts = <16 1>;
+	prescaler = <0>;
 	label = "TIMER_1";
 };
 
@@ -253,5 +259,6 @@ timer2: timer@11000 {
 	status = "disabled";
 	reg = <0x11000 0x1000>;
 	interrupts = <17 1>;
+	prescaler = <0>;
 	label = "TIMER_2";
 };

dts/bindings/rtc/nordic,nrf-rtc.yaml

@@ -22,4 +22,14 @@ properties:
       description: mmio register space
       generation: define
       category: required
+
+    #If enabled, overflow different than full range (24 bits) is handled
+    #through PPI channel which ensures precise timing. If disabled then
+    #counter is cleared in the interrupt which results in accumulative
+    #error of counter period if top value is different than maximal.
+    ppi-wrap:
+      type: boolean
+      description: Enable wrapping with PPI
+      generation: define
+      category: required
 ...

dts/bindings/rtc/rtc.yaml

@@ -36,9 +36,10 @@ properties:
       type: stringlist
       category: optional
       description: names of required interrupts
+
     prescaler:
       type: int
       category: required
-      description: Prescaler value denotes number of RTC ticks in 1 second
+      description: RTC frequency equals clock-frequency divided by the prescaler value
       generation: define
 ...

dts/bindings/timer/nordic,nrf-timer.yaml

@@ -34,4 +34,10 @@ properties:
       category: required
       description: Human readable string describing the device (used by Zephyr for API name)
       generation: define
+
+    prescaler:
+      type: int
+      category: required
+      description: Prescaler value determines frequency (16MHz/2^prescaler)
+      generation: define
 ...

tests/drivers/counter/counter_basic_api/boards/nrf51_pca10028.conf

@@ -1,7 +1,4 @@
 CONFIG_COUNTER_TIMER0=y
-CONFIG_COUNTER_TIMER0_PRESCALER=4
 CONFIG_COUNTER_TIMER1=y
-CONFIG_COUNTER_TIMER1_PRESCALER=4
 CONFIG_COUNTER_TIMER2=y
-CONFIG_COUNTER_TIMER2_PRESCALER=4
+CONFIG_COUNTER_RTC0=y
-CONFIG_COUNTER_RTC0=y

tests/drivers/counter/counter_basic_api/boards/nrf52810_pca10040.conf

@@ -1,7 +1,4 @@
 CONFIG_COUNTER_TIMER0=y
-CONFIG_COUNTER_TIMER0_PRESCALER=4
 CONFIG_COUNTER_TIMER1=y
-CONFIG_COUNTER_TIMER1_PRESCALER=4
 CONFIG_COUNTER_TIMER2=y
-CONFIG_COUNTER_TIMER2_PRESCALER=4
 CONFIG_COUNTER_RTC0=y

tests/drivers/counter/counter_basic_api/boards/nrf52811_pca10056.conf

@@ -1,7 +1,4 @@
 CONFIG_COUNTER_TIMER0=y
-CONFIG_COUNTER_TIMER0_PRESCALER=4
 CONFIG_COUNTER_TIMER1=y
-CONFIG_COUNTER_TIMER1_PRESCALER=4
 CONFIG_COUNTER_TIMER2=y
-CONFIG_COUNTER_TIMER2_PRESCALER=4
 CONFIG_COUNTER_RTC0=y

tests/drivers/counter/counter_basic_api/boards/nrf52840_pca10056.conf

@@ -1,12 +1,7 @@
 CONFIG_COUNTER_TIMER0=y
-CONFIG_COUNTER_TIMER0_PRESCALER=4
 CONFIG_COUNTER_TIMER1=y
-CONFIG_COUNTER_TIMER1_PRESCALER=4
 CONFIG_COUNTER_TIMER2=y
-CONFIG_COUNTER_TIMER2_PRESCALER=4
 CONFIG_COUNTER_TIMER3=y
-CONFIG_COUNTER_TIMER3_PRESCALER=4
 CONFIG_COUNTER_TIMER4=y
-CONFIG_COUNTER_TIMER4_PRESCALER=4
 CONFIG_COUNTER_RTC0=y
-CONFIG_COUNTER_RTC2=y
+CONFIG_COUNTER_RTC2=y

tests/drivers/counter/counter_basic_api/boards/nrf52_pca10040.conf

@@ -1,12 +1,7 @@
 CONFIG_COUNTER_TIMER0=y
-CONFIG_COUNTER_TIMER0_PRESCALER=4
 CONFIG_COUNTER_TIMER1=y
-CONFIG_COUNTER_TIMER1_PRESCALER=4
 CONFIG_COUNTER_TIMER2=y
-CONFIG_COUNTER_TIMER2_PRESCALER=4
 CONFIG_COUNTER_TIMER3=y
-CONFIG_COUNTER_TIMER3_PRESCALER=4
 CONFIG_COUNTER_TIMER4=y
-CONFIG_COUNTER_TIMER4_PRESCALER=4
 CONFIG_COUNTER_RTC0=y
-CONFIG_COUNTER_RTC2=y
+CONFIG_COUNTER_RTC2=y

tests/drivers/counter/counter_basic_api/nrf51_pca10028.overlay

@@ -0,0 +1,11 @@
+&timer0 {
+	prescaler = <4>;
+};
+
+&timer1 {
+	prescaler = <4>;
+};
+
+&timer2 {
+	prescaler = <4>;
+};

tests/drivers/counter/counter_basic_api/nrf52810_pca10040.overlay

@@ -0,0 +1,11 @@
+&timer0 {
+	prescaler = <4>;
+};
+
+&timer1 {
+	prescaler = <4>;
+};
+
+&timer2 {
+	prescaler = <4>;
+};

tests/drivers/counter/counter_basic_api/nrf52811_pca10056.overlay

@@ -0,0 +1,11 @@
+&timer0 {
+	prescaler = <4>;
+};
+
+&timer1 {
+	prescaler = <4>;
+};
+
+&timer2 {
+	prescaler = <4>;
+};

tests/drivers/counter/counter_basic_api/nrf52840_pca10056.overlay

@@ -0,0 +1,19 @@
+&timer0 {
+	prescaler = <4>;
+};
+
+&timer1 {
+	prescaler = <4>;
+};
+
+&timer2 {
+	prescaler = <4>;
+};
+
+&timer3 {
+	prescaler = <4>;
+};
+
+&timer4 {
+	prescaler = <4>;
+};

tests/drivers/counter/counter_basic_api/nrf52_pca10040.overlay

@@ -0,0 +1,19 @@
+&timer0 {
+	prescaler = <4>;
+};
+
+&timer1 {
+	prescaler = <4>;
+};
+
+&timer2 {
+	prescaler = <4>;
+};
+
+&timer3 {
+	prescaler = <4>;
+};
+
+&timer4 {
+	prescaler = <4>;
+};