drivers: spi: nrfx_spim: move rx delay to DT

Move the RX (MISO) delaying capability information to Devicetree. It is
done using 2 properties:

- rx-delay-supported: enabled on SPI nodes that support delaying RX.
  This property can be used by the driver to determine if this
  capability is supported or not on a given instance.
- rx-delay: the actual RX delay value

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>

drivers/spi/Kconfig.nrfx

@@ -117,32 +117,12 @@ config SPI_3_NRF_SPIS
 	  Due to hardware limitations the implementation supports only simple
 	  buffers (consisting of one part) located in RAM.
 
-config SPI_3_NRF_RX_DELAY
-	int "SPIM3 MISO sampling delay"
-	depends on SPI_3_NRF_SPIM && (SOC_NRF52833 || SOC_NRF52840)
-	range 0 7
-	default 2
-	help
-	  Number of 64 MHz clock cycles (15.625 ns) delay from the sampling
-	  edge of SCK (leading or trailing, depending on the CPHA setting used)
-	  until the input serial data on MISO is actually sampled.
-
 config SPI_4_NRF_SPIM
 	def_bool HAS_HW_NRF_SPIM4
 	select NRFX_SPIM4
 	help
 	  Enable nRF SPI Master with EasyDMA on port 4.
 
-config SPI_4_NRF_RX_DELAY
-	int "SPIM4 MISO sampling delay"
-	depends on SPI_4_NRF_SPIM && SOC_NRF5340_CPUAPP
-	range 0 7
-	default 2
-	help
-	  Number of 64 MHz clock cycles (15.625 ns) delay from the sampling
-	  edge of SCK (leading or trailing, depending on the CPHA setting used)
-	  until the input serial data on MISO is actually sampled.
-
 config SPI_NRFX_RAM_BUFFER_SIZE
 	int "Size of RAM buffers for SPIM peripherals"
 	default 8

drivers/spi/spi_nrfx_spi.c

@@ -320,7 +320,6 @@ static int spi_nrfx_pm_action(const struct device *dev,
  * Current factors requiring use of DT_NODELABEL:
  *
  * - NRFX_SPI_INSTANCE() requires an SoC instance number
- * - soc-instance-numbered kconfig enables
  */
 
 #define SPI(idx)			DT_NODELABEL(spi##idx)

drivers/spi/spi_nrfx_spim.c

@@ -507,8 +507,9 @@ static int spim_nrfx_pm_action(const struct device *dev,
 #define SPI_NRFX_SPIM_EXTENDED_CONFIG(idx)				\
 	IF_ENABLED(NRFX_SPIM_EXTENDED_ENABLED,				\
 		(.dcx_pin = NRFX_SPIM_PIN_NOT_USED,			\
-		 IF_ENABLED(SPIM##idx##_FEATURE_RXDELAY_PRESENT,	\
-			(.rx_delay = CONFIG_SPI_##idx##_NRF_RX_DELAY,))	\
+		 COND_CODE_1(SPIM_PROP(idx, rx_delay_supported),	\
+			     (.rx_delay = SPIM_PROP(idx, rx_delay),),	\
+			     ())					\
 		))
 
 #define SPI_NRFX_SPIM_PIN_CFG(idx)					\

dts/arm/nordic/nrf52833.dtsi

@@ -505,6 +505,8 @@
 			reg = <0x4002f000 0x1000>;
 			interrupts = <47 NRF_DEFAULT_IRQ_PRIORITY>;
 			max-frequency = <DT_FREQ_M(32)>;
+			rx-delay-supported;
+			rx-delay = <2>;
 			status = "disabled";
 			label = "SPI_3";
 		};

dts/arm/nordic/nrf52840.dtsi

@@ -511,6 +511,8 @@
 			reg = <0x4002f000 0x1000>;
 			interrupts = <47 NRF_DEFAULT_IRQ_PRIORITY>;
 			max-frequency = <DT_FREQ_M(32)>;
+			rx-delay-supported;
+			rx-delay = <2>;
 			status = "disabled";
 			label = "SPI_3";
 		};

dts/arm/nordic/nrf5340_cpuapp_peripherals.dtsi

@@ -139,6 +139,8 @@ spi4: spi@a000 {
 	reg = <0xa000 0x1000>;
 	interrupts = <10 NRF_DEFAULT_IRQ_PRIORITY>;
 	max-frequency = <DT_FREQ_M(32)>;
+	rx-delay-supported;
+	rx-delay = <2>;
 	status = "disabled";
 	label = "SPI_4";
 };

dts/bindings/spi/nordic,nrf-spim.yaml

@@ -25,3 +25,28 @@ properties:
         Enables the workaround for the nRF52832 SoC SPIM PAN 58 anomaly.
         Must be used in conjunction with
         CONFIG_SOC_NRF52832_ALLOW_SPIM_DESPITE_PAN_58=y
+
+    rx-delay-supported:
+      type: boolean
+      required: false
+      description: |
+        Indicates if the SPIM instance has the capability of delaying MISO
+        sampling. This property needs to be defined at SoC level DTS files.
+
+    rx-delay:
+      type: int
+      required: false
+      enum:
+        - 0
+        - 1
+        - 2
+        - 3
+        - 4
+        - 5
+        - 6
+        - 7
+      description: |
+        Number of 64 MHz clock cycles (15.625 ns) delay from the sampling edge
+        of SCK (leading or trailing, depending on the CPHA setting used) until
+        the input serial data on MISO is actually sampled. This property does
+        not have any effect if the rx-delay-supported property is not set.

modules/hal_nordic/nrfx/nrfx_config.h

@@ -7,6 +7,7 @@
 #ifndef NRFX_CONFIG_H__
 #define NRFX_CONFIG_H__
 
+#include <zephyr/devicetree.h>
 
 /*
  * These are mappings of Kconfig options enabling nrfx drivers and particular
@@ -228,7 +229,8 @@
 #ifdef CONFIG_NRFX_SPIM4
 #define NRFX_SPIM4_ENABLED 1
 #endif
-#if defined(CONFIG_SPI_3_NRF_RX_DELAY) || defined(CONFIG_SPI_4_NRF_RX_DELAY)
+#if (DT_PROP(DT_NODELABEL(spi3), rx_delay_supported) || \
+	DT_PROP(DT_NODELABEL(spi4), rx_delay_supported))
 #define NRFX_SPIM_EXTENDED_ENABLED 1
 #endif
 

tests/drivers/spi/spi_loopback/boards/nrf52840dk_nrf52840.conf

@@ -1,5 +1,3 @@
-CONFIG_SPI_3_NRF_RX_DELAY=1
-
 CONFIG_SPI_LOOPBACK_DRV_NAME="SPI_3"
 CONFIG_SPI_LOOPBACK_CS_GPIO=y
 CONFIG_SPI_LOOPBACK_CS_CTRL_GPIO_DRV_NAME="GPIO_0"

tests/drivers/spi/spi_loopback/boards/nrf52840dk_nrf52840.overlay

@@ -6,4 +6,5 @@
 
 &spi3 {
 	overrun-character = <0x00>;
+	rx-delay = <1>;
 };