drivers/spi/spi_nrfx_spi.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2017 - 2018, Nordic Semiconductor ASA
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #include <zephyr/drivers/spi.h>
 #include <zephyr/drivers/spi/rtio.h>
 #include <zephyr/pm/device.h>
 #include <zephyr/drivers/pinctrl.h>
 #include <soc.h>
 #include <nrfx_spi.h>

 #include <zephyr/logging/log.h>
 #include <zephyr/irq.h>
 LOG_MODULE_REGISTER(spi_nrfx_spi, CONFIG_SPI_LOG_LEVEL);

 #include "spi_context.h"
 #include "spi_nrfx_common.h"

 struct spi_nrfx_data {
 	struct spi_context ctx;
 	const struct device *dev;
 	size_t chunk_len;
 	bool   busy;
 	bool   initialized;
 };

 struct spi_nrfx_config {
 	nrfx_spi_t	  spi;
 	nrfx_spi_config_t def_config;
 	void (*irq_connect)(void);
 	const struct pinctrl_dev_config *pcfg;
 	uint32_t wake_pin;
 	nrfx_gpiote_t wake_gpiote;
 };

 static void event_handler(const nrfx_spi_evt_t *p_event, void *p_context);

 static inline nrf_spi_frequency_t get_nrf_spi_frequency(uint32_t frequency)
 {
 	/* Get the highest supported frequency not exceeding the requested one.
 	 */
 	if (frequency < 250000) {
 		return NRF_SPI_FREQ_125K;
 	} else if (frequency < 500000) {
 		return NRF_SPI_FREQ_250K;
 	} else if (frequency < 1000000) {
 		return NRF_SPI_FREQ_500K;
 	} else if (frequency < 2000000) {
 		return NRF_SPI_FREQ_1M;
 	} else if (frequency < 4000000) {
 		return NRF_SPI_FREQ_2M;
 	} else if (frequency < 8000000) {
 		return NRF_SPI_FREQ_4M;
 	} else {
 		return NRF_SPI_FREQ_8M;
 	}
 }

 static inline nrf_spi_mode_t get_nrf_spi_mode(uint16_t operation)
 {
 	if (SPI_MODE_GET(operation) & SPI_MODE_CPOL) {
 		if (SPI_MODE_GET(operation) & SPI_MODE_CPHA) {
 			return NRF_SPI_MODE_3;
 		} else {
 			return NRF_SPI_MODE_2;
 		}
 	} else {
 		if (SPI_MODE_GET(operation) & SPI_MODE_CPHA) {
 			return NRF_SPI_MODE_1;
 		} else {
 			return NRF_SPI_MODE_0;
 		}
 	}
 }

 static inline nrf_spi_bit_order_t get_nrf_spi_bit_order(uint16_t operation)
 {
 	if (operation & SPI_TRANSFER_LSB) {
 		return NRF_SPI_BIT_ORDER_LSB_FIRST;
 	} else {
 		return NRF_SPI_BIT_ORDER_MSB_FIRST;
 	}
 }

 static int configure(const struct device *dev,
 		     const struct spi_config *spi_cfg)
 {
 	struct spi_nrfx_data *dev_data = dev->data;
 	const struct spi_nrfx_config *dev_config = dev->config;
 	struct spi_context *ctx = &dev_data->ctx;
 	nrfx_spi_config_t config;
 	nrfx_err_t result;

 	if (dev_data->initialized && spi_context_configured(ctx, spi_cfg)) {
 		/* Already configured. No need to do it again. */
 		return 0;
 	}

 	if (spi_cfg->operation & SPI_HALF_DUPLEX) {
 		LOG_ERR("Half-duplex not supported");
 		return -ENOTSUP;
 	}

 	if (SPI_OP_MODE_GET(spi_cfg->operation) != SPI_OP_MODE_MASTER) {
 		LOG_ERR("Slave mode is not supported on %s", dev->name);
 		return -EINVAL;
 	}

 	if (spi_cfg->operation & SPI_MODE_LOOP) {
 		LOG_ERR("Loopback mode is not supported");
 		return -EINVAL;
 	}

 	if (IS_ENABLED(CONFIG_SPI_EXTENDED_MODES) &&
 	    (spi_cfg->operation & SPI_LINES_MASK) != SPI_LINES_SINGLE) {
 		LOG_ERR("Only single line mode is supported");
 		return -EINVAL;
 	}

 	if (SPI_WORD_SIZE_GET(spi_cfg->operation) != 8) {
 		LOG_ERR("Word sizes other than 8 bits are not supported");
 		return -EINVAL;
 	}

 	if (spi_cfg->frequency < 125000) {
 		LOG_ERR("Frequencies lower than 125 kHz are not supported");
 		return -EINVAL;
 	}

 	config = dev_config->def_config;

 	config.frequency = get_nrf_spi_frequency(spi_cfg->frequency);
 	config.mode      = get_nrf_spi_mode(spi_cfg->operation);
 	config.bit_order = get_nrf_spi_bit_order(spi_cfg->operation);

 	nrf_gpio_pin_write(nrf_spi_sck_pin_get(dev_config->spi.p_reg),
 			   spi_cfg->operation & SPI_MODE_CPOL ? 1 : 0);

 	if (dev_data->initialized) {
 		nrfx_spi_uninit(&dev_config->spi);
 		dev_data->initialized = false;
 	}

 	result = nrfx_spi_init(&dev_config->spi, &config,
 			       event_handler, dev_data);
 	if (result != NRFX_SUCCESS) {
 		LOG_ERR("Failed to initialize nrfx driver: %08x", result);
 		return -EIO;
 	}

 	dev_data->initialized = true;

 	ctx->config = spi_cfg;

 	return 0;
 }

 static void finish_transaction(const struct device *dev, int error)
 {
 	struct spi_nrfx_data *dev_data = dev->data;
 	struct spi_context *ctx = &dev_data->ctx;

 	LOG_DBG("Transaction finished with status %d", error);

 	spi_context_complete(ctx, dev, error);
 	dev_data->busy = false;
 }

 static void transfer_next_chunk(const struct device *dev)
 {
 	const struct spi_nrfx_config *dev_config = dev->config;
 	struct spi_nrfx_data *dev_data = dev->data;
 	struct spi_context *ctx = &dev_data->ctx;
 	int error = 0;

 	size_t chunk_len = spi_context_max_continuous_chunk(ctx);

 	if (chunk_len > 0) {
 		nrfx_spi_xfer_desc_t xfer;
 		nrfx_err_t result;

 		dev_data->chunk_len = chunk_len;

 		xfer.p_tx_buffer = ctx->tx_buf;
 		xfer.tx_length   = spi_context_tx_buf_on(ctx) ? chunk_len : 0;
 		xfer.p_rx_buffer = ctx->rx_buf;
 		xfer.rx_length   = spi_context_rx_buf_on(ctx) ? chunk_len : 0;
 		result = nrfx_spi_xfer(&dev_config->spi, &xfer, 0);
 		if (result == NRFX_SUCCESS) {
 			return;
 		}

 		error = -EIO;
 	}

 	finish_transaction(dev, error);
 }

 static void event_handler(const nrfx_spi_evt_t *p_event, void *p_context)
 {
 	struct spi_nrfx_data *dev_data = p_context;

 	if (p_event->type == NRFX_SPI_EVENT_DONE) {
 		/* Chunk length is set to 0 when a transaction is aborted
 		 * due to a timeout.
 		 */
 		if (dev_data->chunk_len == 0) {
 			finish_transaction(dev_data->dev, -ETIMEDOUT);
 			return;
 		}

 		spi_context_update_tx(&dev_data->ctx, 1, dev_data->chunk_len);
 		spi_context_update_rx(&dev_data->ctx, 1, dev_data->chunk_len);

 		transfer_next_chunk(dev_data->dev);
 	}
 }

 static int transceive(const struct device *dev,
 		      const struct spi_config *spi_cfg,
 		      const struct spi_buf_set *tx_bufs,
 		      const struct spi_buf_set *rx_bufs,
 		      bool asynchronous,
 		      spi_callback_t cb,
 		      void *userdata)
 {
 	struct spi_nrfx_data *dev_data = dev->data;
 	const struct spi_nrfx_config *dev_config = dev->config;
 	int error;

 	spi_context_lock(&dev_data->ctx, asynchronous, cb, userdata, spi_cfg);

 	error = configure(dev, spi_cfg);
 	if (error == 0) {
 		dev_data->busy = true;

 		if (dev_config->wake_pin != WAKE_PIN_NOT_USED) {
 			error = spi_nrfx_wake_request(&dev_config->wake_gpiote,
 						      dev_config->wake_pin);
 			if (error == -ETIMEDOUT) {
 				LOG_WRN("Waiting for WAKE acknowledgment timed out");
 				/* If timeout occurs, try to perform the transfer
 				 * anyway, just in case the slave device was unable
 				 * to signal that it was already awaken and prepared
 				 * for the transfer.
 				 */
 			}
 		}

 		spi_context_buffers_setup(&dev_data->ctx, tx_bufs, rx_bufs, 1);
 		spi_context_cs_control(&dev_data->ctx, true);

 		transfer_next_chunk(dev);

 		error = spi_context_wait_for_completion(&dev_data->ctx);
 		if (error == -ETIMEDOUT) {
 			/* Set the chunk length to 0 so that event_handler()
 			 * knows that the transaction timed out and is to be
 			 * aborted.
 			 */
 			dev_data->chunk_len = 0;
 			/* Abort the current transfer by deinitializing
 			 * the nrfx driver.
 			 */
 			nrfx_spi_uninit(&dev_config->spi);
 			dev_data->initialized = false;

 			/* Make sure the transaction is finished (it may be
 			 * already finished if it actually did complete before
 			 * the nrfx driver was deinitialized).
 			 */
 			finish_transaction(dev, -ETIMEDOUT);

 			/* Clean up the driver state. */
 			k_sem_reset(&dev_data->ctx.sync);
 		}

 		spi_context_cs_control(&dev_data->ctx, false);
 	}

 	spi_context_release(&dev_data->ctx, error);

 	return error;
 }

 static int spi_nrfx_transceive(const struct device *dev,
 			       const struct spi_config *spi_cfg,
 			       const struct spi_buf_set *tx_bufs,
 			       const struct spi_buf_set *rx_bufs)
 {
 	return transceive(dev, spi_cfg, tx_bufs, rx_bufs, false, NULL, NULL);
 }

 #ifdef CONFIG_SPI_ASYNC
 static int spi_nrfx_transceive_async(const struct device *dev,
 				     const struct spi_config *spi_cfg,
 				     const struct spi_buf_set *tx_bufs,
 				     const struct spi_buf_set *rx_bufs,
 				     spi_callback_t cb,
 				     void *userdata)
 {
 	return transceive(dev, spi_cfg, tx_bufs, rx_bufs, true, cb, userdata);
 }
 #endif /* CONFIG_SPI_ASYNC */

 static int spi_nrfx_release(const struct device *dev,
 			    const struct spi_config *spi_cfg)
 {
 	struct spi_nrfx_data *dev_data = dev->data;

 	if (!spi_context_configured(&dev_data->ctx, spi_cfg)) {
 		return -EINVAL;
 	}

 	if (dev_data->busy) {
 		return -EBUSY;
 	}

 	spi_context_unlock_unconditionally(&dev_data->ctx);

 	return 0;
 }

 static const struct spi_driver_api spi_nrfx_driver_api = {
 	.transceive = spi_nrfx_transceive,
 #ifdef CONFIG_SPI_ASYNC
 	.transceive_async = spi_nrfx_transceive_async,
 #endif
 #ifdef CONFIG_SPI_RTIO
 	.iodev_submit = spi_rtio_iodev_default_submit,
 #endif
 	.release = spi_nrfx_release,
 };

 #ifdef CONFIG_PM_DEVICE
 static int spi_nrfx_pm_action(const struct device *dev,
 			      enum pm_device_action action)
 {
 	int ret = 0;
 	struct spi_nrfx_data *dev_data = dev->data;
 	const struct spi_nrfx_config *dev_config = dev->config;

 	switch (action) {
 	case PM_DEVICE_ACTION_RESUME:
 		ret = pinctrl_apply_state(dev_config->pcfg,
 					  PINCTRL_STATE_DEFAULT);
 		if (ret < 0) {
 			return ret;
 		}
 		/* nrfx_spi_init() will be called at configuration before
 		 * the next transfer.
 		 */
 		break;

 	case PM_DEVICE_ACTION_SUSPEND:
 		if (dev_data->initialized) {
 			nrfx_spi_uninit(&dev_config->spi);
 			dev_data->initialized = false;
 		}

 		ret = pinctrl_apply_state(dev_config->pcfg,
 					  PINCTRL_STATE_SLEEP);
 		if (ret < 0) {
 			return ret;
 		}
 		break;

 	default:
 		ret = -ENOTSUP;
 	}

 	return ret;
 }
 #endif /* CONFIG_PM_DEVICE */

 static int spi_nrfx_init(const struct device *dev)
 {
 	const struct spi_nrfx_config *dev_config = dev->config;
 	struct spi_nrfx_data *dev_data = dev->data;
 	int err;

 	err = pinctrl_apply_state(dev_config->pcfg, PINCTRL_STATE_DEFAULT);
 	if (err < 0) {
 		return err;
 	}

 	if (dev_config->wake_pin != WAKE_PIN_NOT_USED) {
 		err = spi_nrfx_wake_init(&dev_config->wake_gpiote, dev_config->wake_pin);
 		if (err == -ENODEV) {
 			LOG_ERR("Failed to allocate GPIOTE channel for WAKE");
 			return err;
 		}
 		if (err == -EIO) {
 			LOG_ERR("Failed to configure WAKE pin");
 			return err;
 		}
 	}

 	dev_config->irq_connect();

 	err = spi_context_cs_configure_all(&dev_data->ctx);
 	if (err < 0) {
 		return err;
 	}

 	spi_context_unlock_unconditionally(&dev_data->ctx);

 	return 0;
 }

 /*
  * Current factors requiring use of DT_NODELABEL:
  *
  * - HAL design (requirement of drv_inst_idx in nrfx_spi_t)
  * - Name-based HAL IRQ handlers, e.g. nrfx_spi_0_irq_handler
  */

 #define SPI(idx)			DT_NODELABEL(spi##idx)
 #define SPI_PROP(idx, prop)		DT_PROP(SPI(idx), prop)

 #define SPI_NRFX_SPI_DEFINE(idx)					       \
 	NRF_DT_CHECK_NODE_HAS_PINCTRL_SLEEP(SPI(idx));			       \
 	static void irq_connect##idx(void)				       \
 	{								       \
 		IRQ_CONNECT(DT_IRQN(SPI(idx)), DT_IRQ(SPI(idx), priority),     \
 			    nrfx_isr, nrfx_spi_##idx##_irq_handler, 0);	       \
 	}								       \
 	static struct spi_nrfx_data spi_##idx##_data = {		       \
 		SPI_CONTEXT_INIT_LOCK(spi_##idx##_data, ctx),		       \
 		SPI_CONTEXT_INIT_SYNC(spi_##idx##_data, ctx),		       \
 		SPI_CONTEXT_CS_GPIOS_INITIALIZE(SPI(idx), ctx)		       \
 		.dev  = DEVICE_DT_GET(SPI(idx)),			       \
 		.busy = false,						       \
 	};								       \
 	PINCTRL_DT_DEFINE(SPI(idx));					       \
 	static const struct spi_nrfx_config spi_##idx##z_config = {	       \
 		.spi = {						       \
 			.p_reg = (NRF_SPI_Type *)DT_REG_ADDR(SPI(idx)),	       \
 			.drv_inst_idx = NRFX_SPI##idx##_INST_IDX,	       \
 		},							       \
 		.def_config = {						       \
 			.skip_gpio_cfg = true,				       \
 			.skip_psel_cfg = true,				       \
 			.ss_pin = NRFX_SPI_PIN_NOT_USED,		       \
 			.orc    = SPI_PROP(idx, overrun_character),	       \
 		},							       \
 		.irq_connect = irq_connect##idx,			       \
 		.pcfg = PINCTRL_DT_DEV_CONFIG_GET(SPI(idx)),		       \
 		.wake_pin = NRF_DT_GPIOS_TO_PSEL_OR(SPI(idx), wake_gpios,      \
 						    WAKE_PIN_NOT_USED),	       \
 		.wake_gpiote = WAKE_GPIOTE_INSTANCE(SPI(idx)),		       \
 	};								       \
 	BUILD_ASSERT(!DT_NODE_HAS_PROP(SPI(idx), wake_gpios) ||		       \
 		     !(DT_GPIO_FLAGS(SPI(idx), wake_gpios) & GPIO_ACTIVE_LOW), \
 		     "WAKE line must be configured as active high");	       \
 	PM_DEVICE_DT_DEFINE(SPI(idx), spi_nrfx_pm_action);		       \
 	DEVICE_DT_DEFINE(SPI(idx),					       \
 		      spi_nrfx_init,					       \
 		      PM_DEVICE_DT_GET(SPI(idx)),			       \
 		      &spi_##idx##_data,				       \
 		      &spi_##idx##z_config,				       \
 		      POST_KERNEL, CONFIG_SPI_INIT_PRIORITY,		       \
 		      &spi_nrfx_driver_api)

 #ifdef CONFIG_HAS_HW_NRF_SPI0
 SPI_NRFX_SPI_DEFINE(0);
 #endif

 #ifdef CONFIG_HAS_HW_NRF_SPI1
 SPI_NRFX_SPI_DEFINE(1);
 #endif

 #ifdef CONFIG_HAS_HW_NRF_SPI2
 SPI_NRFX_SPI_DEFINE(2);
 #endif
	/*
	* Copyright (c) 2017 - 2018, Nordic Semiconductor ASA
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#include <zephyr/drivers/spi.h>
	#include <zephyr/drivers/spi/rtio.h>
	#include <zephyr/pm/device.h>
	#include <zephyr/drivers/pinctrl.h>
	#include <soc.h>
	#include <nrfx_spi.h>

	#include <zephyr/logging/log.h>
	#include <zephyr/irq.h>
	LOG_MODULE_REGISTER(spi_nrfx_spi, CONFIG_SPI_LOG_LEVEL);

	#include "spi_context.h"
	#include "spi_nrfx_common.h"

	struct spi_nrfx_data {
	struct spi_context ctx;
	const struct device *dev;
	size_t chunk_len;
	bool busy;
	bool initialized;
	};

	struct spi_nrfx_config {
	nrfx_spi_t spi;
	nrfx_spi_config_t def_config;
	void (*irq_connect)(void);
	const struct pinctrl_dev_config *pcfg;
	uint32_t wake_pin;
	nrfx_gpiote_t wake_gpiote;
	};

	static void event_handler(const nrfx_spi_evt_t p_event, void p_context);

	static inline nrf_spi_frequency_t get_nrf_spi_frequency(uint32_t frequency)
	{
	/* Get the highest supported frequency not exceeding the requested one.
	*/
	if (frequency < 250000) {
	return NRF_SPI_FREQ_125K;
	} else if (frequency < 500000) {
	return NRF_SPI_FREQ_250K;
	} else if (frequency < 1000000) {
	return NRF_SPI_FREQ_500K;
	} else if (frequency < 2000000) {
	return NRF_SPI_FREQ_1M;
	} else if (frequency < 4000000) {
	return NRF_SPI_FREQ_2M;
	} else if (frequency < 8000000) {
	return NRF_SPI_FREQ_4M;
	} else {
	return NRF_SPI_FREQ_8M;
	}
	}

	static inline nrf_spi_mode_t get_nrf_spi_mode(uint16_t operation)
	{
	if (SPI_MODE_GET(operation) & SPI_MODE_CPOL) {
	if (SPI_MODE_GET(operation) & SPI_MODE_CPHA) {
	return NRF_SPI_MODE_3;
	} else {
	return NRF_SPI_MODE_2;
	}
	} else {
	if (SPI_MODE_GET(operation) & SPI_MODE_CPHA) {
	return NRF_SPI_MODE_1;
	} else {
	return NRF_SPI_MODE_0;
	}
	}
	}

	static inline nrf_spi_bit_order_t get_nrf_spi_bit_order(uint16_t operation)
	{
	if (operation & SPI_TRANSFER_LSB) {
	return NRF_SPI_BIT_ORDER_LSB_FIRST;
	} else {
	return NRF_SPI_BIT_ORDER_MSB_FIRST;
	}
	}

	static int configure(const struct device *dev,
	const struct spi_config *spi_cfg)
	{
	struct spi_nrfx_data *dev_data = dev->data;
	const struct spi_nrfx_config *dev_config = dev->config;
	struct spi_context *ctx = &dev_data->ctx;
	nrfx_spi_config_t config;
	nrfx_err_t result;

	if (dev_data->initialized && spi_context_configured(ctx, spi_cfg)) {
	/* Already configured. No need to do it again. */
	return 0;
	}

	if (spi_cfg->operation & SPI_HALF_DUPLEX) {
	LOG_ERR("Half-duplex not supported");
	return -ENOTSUP;
	}

	if (SPI_OP_MODE_GET(spi_cfg->operation) != SPI_OP_MODE_MASTER) {
	LOG_ERR("Slave mode is not supported on %s", dev->name);
	return -EINVAL;
	}

	if (spi_cfg->operation & SPI_MODE_LOOP) {
	LOG_ERR("Loopback mode is not supported");
	return -EINVAL;
	}

	if (IS_ENABLED(CONFIG_SPI_EXTENDED_MODES) &&
	(spi_cfg->operation & SPI_LINES_MASK) != SPI_LINES_SINGLE) {
	LOG_ERR("Only single line mode is supported");
	return -EINVAL;
	}

	if (SPI_WORD_SIZE_GET(spi_cfg->operation) != 8) {
	LOG_ERR("Word sizes other than 8 bits are not supported");
	return -EINVAL;
	}

	if (spi_cfg->frequency < 125000) {
	LOG_ERR("Frequencies lower than 125 kHz are not supported");
	return -EINVAL;
	}

	config = dev_config->def_config;

	config.frequency = get_nrf_spi_frequency(spi_cfg->frequency);
	config.mode = get_nrf_spi_mode(spi_cfg->operation);
	config.bit_order = get_nrf_spi_bit_order(spi_cfg->operation);

	nrf_gpio_pin_write(nrf_spi_sck_pin_get(dev_config->spi.p_reg),
	spi_cfg->operation & SPI_MODE_CPOL ? 1 : 0);

	if (dev_data->initialized) {
	nrfx_spi_uninit(&dev_config->spi);
	dev_data->initialized = false;
	}

	result = nrfx_spi_init(&dev_config->spi, &config,
	event_handler, dev_data);
	if (result != NRFX_SUCCESS) {
	LOG_ERR("Failed to initialize nrfx driver: %08x", result);
	return -EIO;
	}

	dev_data->initialized = true;

	ctx->config = spi_cfg;

	return 0;
	}

	static void finish_transaction(const struct device *dev, int error)
	{
	struct spi_nrfx_data *dev_data = dev->data;
	struct spi_context *ctx = &dev_data->ctx;

	LOG_DBG("Transaction finished with status %d", error);

	spi_context_complete(ctx, dev, error);
	dev_data->busy = false;
	}

	static void transfer_next_chunk(const struct device *dev)
	{
	const struct spi_nrfx_config *dev_config = dev->config;
	struct spi_nrfx_data *dev_data = dev->data;
	struct spi_context *ctx = &dev_data->ctx;
	int error = 0;

	size_t chunk_len = spi_context_max_continuous_chunk(ctx);

	if (chunk_len > 0) {
	nrfx_spi_xfer_desc_t xfer;
	nrfx_err_t result;

	dev_data->chunk_len = chunk_len;

	xfer.p_tx_buffer = ctx->tx_buf;
	xfer.tx_length = spi_context_tx_buf_on(ctx) ? chunk_len : 0;
	xfer.p_rx_buffer = ctx->rx_buf;
	xfer.rx_length = spi_context_rx_buf_on(ctx) ? chunk_len : 0;
	result = nrfx_spi_xfer(&dev_config->spi, &xfer, 0);
	if (result == NRFX_SUCCESS) {
	return;
	}

	error = -EIO;
	}

	finish_transaction(dev, error);
	}

	static void event_handler(const nrfx_spi_evt_t p_event, void p_context)
	{
	struct spi_nrfx_data *dev_data = p_context;

	if (p_event->type == NRFX_SPI_EVENT_DONE) {
	/* Chunk length is set to 0 when a transaction is aborted
	* due to a timeout.
	*/
	if (dev_data->chunk_len == 0) {
	finish_transaction(dev_data->dev, -ETIMEDOUT);
	return;
	}

	spi_context_update_tx(&dev_data->ctx, 1, dev_data->chunk_len);
	spi_context_update_rx(&dev_data->ctx, 1, dev_data->chunk_len);

	transfer_next_chunk(dev_data->dev);
	}
	}

	static int transceive(const struct device *dev,
	const struct spi_config *spi_cfg,
	const struct spi_buf_set *tx_bufs,
	const struct spi_buf_set *rx_bufs,
	bool asynchronous,
	spi_callback_t cb,
	void *userdata)
	{
	struct spi_nrfx_data *dev_data = dev->data;
	const struct spi_nrfx_config *dev_config = dev->config;
	int error;

	spi_context_lock(&dev_data->ctx, asynchronous, cb, userdata, spi_cfg);

	error = configure(dev, spi_cfg);
	if (error == 0) {
	dev_data->busy = true;

	if (dev_config->wake_pin != WAKE_PIN_NOT_USED) {
	error = spi_nrfx_wake_request(&dev_config->wake_gpiote,
	dev_config->wake_pin);
	if (error == -ETIMEDOUT) {
	LOG_WRN("Waiting for WAKE acknowledgment timed out");
	/* If timeout occurs, try to perform the transfer
	* anyway, just in case the slave device was unable
	* to signal that it was already awaken and prepared
	* for the transfer.
	*/
	}
	}

	spi_context_buffers_setup(&dev_data->ctx, tx_bufs, rx_bufs, 1);
	spi_context_cs_control(&dev_data->ctx, true);

	transfer_next_chunk(dev);

	error = spi_context_wait_for_completion(&dev_data->ctx);
	if (error == -ETIMEDOUT) {
	/* Set the chunk length to 0 so that event_handler()
	* knows that the transaction timed out and is to be
	* aborted.
	*/
	dev_data->chunk_len = 0;
	/* Abort the current transfer by deinitializing
	* the nrfx driver.
	*/
	nrfx_spi_uninit(&dev_config->spi);
	dev_data->initialized = false;

	/* Make sure the transaction is finished (it may be
	* already finished if it actually did complete before
	* the nrfx driver was deinitialized).
	*/
	finish_transaction(dev, -ETIMEDOUT);

	/* Clean up the driver state. */
	k_sem_reset(&dev_data->ctx.sync);
	}

	spi_context_cs_control(&dev_data->ctx, false);
	}

	spi_context_release(&dev_data->ctx, error);

	return error;
	}

	static int spi_nrfx_transceive(const struct device *dev,
	const struct spi_config *spi_cfg,
	const struct spi_buf_set *tx_bufs,
	const struct spi_buf_set *rx_bufs)
	{
	return transceive(dev, spi_cfg, tx_bufs, rx_bufs, false, NULL, NULL);
	}

	#ifdef CONFIG_SPI_ASYNC
	static int spi_nrfx_transceive_async(const struct device *dev,
	const struct spi_config *spi_cfg,
	const struct spi_buf_set *tx_bufs,
	const struct spi_buf_set *rx_bufs,
	spi_callback_t cb,
	void *userdata)
	{
	return transceive(dev, spi_cfg, tx_bufs, rx_bufs, true, cb, userdata);
	}
	#endif /* CONFIG_SPI_ASYNC */

	static int spi_nrfx_release(const struct device *dev,
	const struct spi_config *spi_cfg)
	{
	struct spi_nrfx_data *dev_data = dev->data;

	if (!spi_context_configured(&dev_data->ctx, spi_cfg)) {
	return -EINVAL;
	}

	if (dev_data->busy) {
	return -EBUSY;
	}

	spi_context_unlock_unconditionally(&dev_data->ctx);

	return 0;
	}

	static const struct spi_driver_api spi_nrfx_driver_api = {
	.transceive = spi_nrfx_transceive,
	#ifdef CONFIG_SPI_ASYNC
	.transceive_async = spi_nrfx_transceive_async,
	#endif
	#ifdef CONFIG_SPI_RTIO
	.iodev_submit = spi_rtio_iodev_default_submit,
	#endif
	.release = spi_nrfx_release,
	};

	#ifdef CONFIG_PM_DEVICE
	static int spi_nrfx_pm_action(const struct device *dev,
	enum pm_device_action action)
	{
	int ret = 0;
	struct spi_nrfx_data *dev_data = dev->data;
	const struct spi_nrfx_config *dev_config = dev->config;

	switch (action) {
	case PM_DEVICE_ACTION_RESUME:
	ret = pinctrl_apply_state(dev_config->pcfg,
	PINCTRL_STATE_DEFAULT);
	if (ret < 0) {
	return ret;
	}
	/* nrfx_spi_init() will be called at configuration before
	* the next transfer.
	*/
	break;

	case PM_DEVICE_ACTION_SUSPEND:
	if (dev_data->initialized) {
	nrfx_spi_uninit(&dev_config->spi);
	dev_data->initialized = false;
	}

	ret = pinctrl_apply_state(dev_config->pcfg,
	PINCTRL_STATE_SLEEP);
	if (ret < 0) {
	return ret;
	}
	break;

	default:
	ret = -ENOTSUP;
	}

	return ret;
	}
	#endif /* CONFIG_PM_DEVICE */

	static int spi_nrfx_init(const struct device *dev)
	{
	const struct spi_nrfx_config *dev_config = dev->config;
	struct spi_nrfx_data *dev_data = dev->data;
	int err;

	err = pinctrl_apply_state(dev_config->pcfg, PINCTRL_STATE_DEFAULT);
	if (err < 0) {
	return err;
	}

	if (dev_config->wake_pin != WAKE_PIN_NOT_USED) {
	err = spi_nrfx_wake_init(&dev_config->wake_gpiote, dev_config->wake_pin);
	if (err == -ENODEV) {
	LOG_ERR("Failed to allocate GPIOTE channel for WAKE");
	return err;
	}
	if (err == -EIO) {
	LOG_ERR("Failed to configure WAKE pin");
	return err;
	}
	}

	dev_config->irq_connect();

	err = spi_context_cs_configure_all(&dev_data->ctx);
	if (err < 0) {
	return err;
	}

	spi_context_unlock_unconditionally(&dev_data->ctx);

	return 0;
	}

	/*
	* Current factors requiring use of DT_NODELABEL:
	*
	* - HAL design (requirement of drv_inst_idx in nrfx_spi_t)
	* - Name-based HAL IRQ handlers, e.g. nrfx_spi_0_irq_handler
	*/

	#define SPI(idx) DT_NODELABEL(spi##idx)
	#define SPI_PROP(idx, prop) DT_PROP(SPI(idx), prop)

	#define SPI_NRFX_SPI_DEFINE(idx) \
	NRF_DT_CHECK_NODE_HAS_PINCTRL_SLEEP(SPI(idx)); \
	static void irq_connect##idx(void) \
	{ \
	IRQ_CONNECT(DT_IRQN(SPI(idx)), DT_IRQ(SPI(idx), priority), \
	nrfx_isr, nrfx_spi_##idx##_irq_handler, 0); \
	} \
	static struct spi_nrfx_data spi_##idx##_data = { \
	SPI_CONTEXT_INIT_LOCK(spi_##idx##_data, ctx), \
	SPI_CONTEXT_INIT_SYNC(spi_##idx##_data, ctx), \
	SPI_CONTEXT_CS_GPIOS_INITIALIZE(SPI(idx), ctx) \
	.dev = DEVICE_DT_GET(SPI(idx)), \
	.busy = false, \
	}; \
	PINCTRL_DT_DEFINE(SPI(idx)); \
	static const struct spi_nrfx_config spi_##idx##z_config = { \
	.spi = { \
	.p_reg = (NRF_SPI_Type *)DT_REG_ADDR(SPI(idx)), \
	.drv_inst_idx = NRFX_SPI##idx##_INST_IDX, \
	}, \
	.def_config = { \
	.skip_gpio_cfg = true, \
	.skip_psel_cfg = true, \
	.ss_pin = NRFX_SPI_PIN_NOT_USED, \
	.orc = SPI_PROP(idx, overrun_character), \
	}, \
	.irq_connect = irq_connect##idx, \
	.pcfg = PINCTRL_DT_DEV_CONFIG_GET(SPI(idx)), \
	.wake_pin = NRF_DT_GPIOS_TO_PSEL_OR(SPI(idx), wake_gpios, \
	WAKE_PIN_NOT_USED), \
	.wake_gpiote = WAKE_GPIOTE_INSTANCE(SPI(idx)), \
	}; \
	BUILD_ASSERT(!DT_NODE_HAS_PROP(SPI(idx), wake_gpios) \|\| \
	!(DT_GPIO_FLAGS(SPI(idx), wake_gpios) & GPIO_ACTIVE_LOW), \
	"WAKE line must be configured as active high"); \
	PM_DEVICE_DT_DEFINE(SPI(idx), spi_nrfx_pm_action); \
	DEVICE_DT_DEFINE(SPI(idx), \
	spi_nrfx_init, \
	PM_DEVICE_DT_GET(SPI(idx)), \
	&spi_##idx##_data, \
	&spi_##idx##z_config, \
	POST_KERNEL, CONFIG_SPI_INIT_PRIORITY, \
	&spi_nrfx_driver_api)

	#ifdef CONFIG_HAS_HW_NRF_SPI0
	SPI_NRFX_SPI_DEFINE(0);
	#endif

	#ifdef CONFIG_HAS_HW_NRF_SPI1
	SPI_NRFX_SPI_DEFINE(1);
	#endif

	#ifdef CONFIG_HAS_HW_NRF_SPI2
	SPI_NRFX_SPI_DEFINE(2);
	#endif