4  * SPDX-License-Identifier: Apache-2.0
46 	return gpio_pin_get_dt(&spi->cfg->dr) > 0;  in eswifi_spi_cmddata_ready()
56 	} while (!eswifi_spi_cmddata_ready(spi) && --max_retries);  in eswifi_spi_wait_cmddata_ready()
58 	return max_retries ? 0 : -ETIMEDOUT;  in eswifi_spi_wait_cmddata_ready()
61 static int eswifi_spi_write(struct eswifi_dev *eswifi, char *data, size_t dlen)  in eswifi_spi_write()  argument
63 	struct eswifi_spi_data *spi = eswifi->bus_data;  in eswifi_spi_write()
68 	spi_tx_buf[0].buf = data;  in eswifi_spi_write()
73 	status = spi_write_dt(&spi->cfg->bus, &spi_tx);  in eswifi_spi_write()
83 static int eswifi_spi_read(struct eswifi_dev *eswifi, char *data, size_t dlen)  in eswifi_spi_read()  argument
85 	struct eswifi_spi_data *spi = eswifi->bus_data;  in eswifi_spi_read()
90 	spi_rx_buf[0].buf = data;  in eswifi_spi_read()
95 	status = spi_read_dt(&spi->cfg->bus, &spi_rx);  in eswifi_spi_read()
108 	struct eswifi_spi_data *spi = eswifi->bus_data;  in eswifi_spi_request()
116 	 * CMD/DATA protocol:  in eswifi_spi_request()
117 	 * 1. Module raises data-ready when ready for **command phase**  in eswifi_spi_request()
118 	 * 2. Host announces command start by lowering chip-select  in eswifi_spi_request()
120 	 * 4. Host announces end of command by raising chip-select  in eswifi_spi_request()
121 	 * 5. Module lowers data-ready signal  in eswifi_spi_request()
122 	 * 6. Module raises data-ready to signal start of the **data phase**  in eswifi_spi_request()
123 	 * 7. Host lowers chip-select  in eswifi_spi_request()
124 	 * 8. Host fetch data as long as data-ready pin is up  in eswifi_spi_request()
125 	 * 9. Module lowers data-ready to signal the end of the data Phase  in eswifi_spi_request()
126 	 * 10. Host raises chip-select  in eswifi_spi_request()
129 	 * All commands to the eS-WiFi module must be post-padded with  in eswifi_spi_request()
131 	 * All data from eS-WiFi module are post-padded with 0x15(NAK) to an  in eswifi_spi_request()
136 		goto data;  in eswifi_spi_request()
139 	/* CMD/DATA READY signals the Command Phase */  in eswifi_spi_request()
142 		LOG_ERR("CMD ready timeout\n");  in eswifi_spi_request()
146 	if (clen % 2) { /* Add post-padding if necessary */  in eswifi_spi_request()
155 	spi_release_dt(&spi->cfg->bus);  in eswifi_spi_request()
157 data:  in eswifi_spi_request()
158 	/* CMD/DATA READY signals the Data Phase */  in eswifi_spi_request()
161 		LOG_ERR("DATA ready timeout\n");  in eswifi_spi_request()
166 		to_read = MIN(rlen - offset, to_read);  in eswifi_spi_request()
173 	/* Flush remaining data if receiving buffer not large enough */  in eswifi_spi_request()
180 	spi_release_dt(&spi->cfg->bus);  in eswifi_spi_request()
207 	if (strncmp(rsp, startstr, sizeof(endstr) - 1)) {  in eswifi_spi_read_msg()
214 	msg_len = ret - (sizeof(startstr) - 1) - (sizeof(endstr) - 1);  in eswifi_spi_read_msg()
216 		eswifi_async_msg(eswifi, rsp + sizeof(endstr) - 1, msg_len);  in eswifi_spi_read_msg()
240 	/* SPI DATA READY PIN */  in eswifi_spi_init()
241 	if (!gpio_is_ready_dt(&cfg->dr)) {  in eswifi_spi_init()
242 		LOG_ERR("device %s is not ready", cfg->dr.port->name);  in eswifi_spi_init()
243 		return -ENODEV;  in eswifi_spi_init()
245 	gpio_pin_configure_dt(&cfg->dr, GPIO_INPUT);  in eswifi_spi_init()
248 	if (!spi_is_ready_dt(&cfg->bus)) {  in eswifi_spi_init()
249 		LOG_ERR("SPI bus is not ready");  in eswifi_spi_init()
250 		return -ENODEV;  in eswifi_spi_init()
253 	spi->cfg = cfg;  in eswifi_spi_init()
255 	eswifi->bus_data = spi;  in eswifi_spi_init()
259 	k_thread_create(&spi->poll_thread, eswifi_spi_poll_stack,  in eswifi_spi_init()