wifi: eswifi: spi: Move spi bus into config

Move 'struct spi_dt_spec bus' into the config struct so it
can be const and than possibly placed in ROM.

Signed-off-by: Kumar Gala <galak@kernel.org>

drivers/wifi/eswifi/eswifi_bus_spi.c

diff --git a/drivers/wifi/eswifi/eswifi_bus_spi.c b/drivers/wifi/eswifi/eswifi_bus_spi.c
index fcc652e..d716ada 100644
--- a/drivers/wifi/eswifi/eswifi_bus_spi.c
+++ b/drivers/wifi/eswifi/eswifi_bus_spi.c
@@ -25,24 +25,23 @@
 struct eswifi_spi_config {
 	struct gpio_dt_spec csn;
 	struct gpio_dt_spec dr;
+	struct spi_dt_spec bus;
 };
 
 struct eswifi_spi_data {
 	const struct eswifi_spi_config *cfg;
-	struct spi_dt_spec bus;
 	struct k_thread poll_thread;
 };
 
 static const struct eswifi_spi_config eswifi_config_spi0 = {
 	.dr = GPIO_DT_SPEC_INST_GET(0, data_gpios),
-};
-
-static struct eswifi_spi_data eswifi_spi0 = { /* Static instance */
 	.bus = SPI_DT_SPEC_INST_GET(0, SPI_OP_MODE_MASTER | SPI_TRANSFER_MSB |
 				    SPI_WORD_SET(16) | SPI_HOLD_ON_CS |
 				    SPI_LOCK_ON, 1000U),
 };
 
+static struct eswifi_spi_data eswifi_spi0;
+
 static bool eswifi_spi_cmddata_ready(struct eswifi_spi_data *spi)
 {
 	return gpio_pin_get_dt(&spi->cfg->dr) > 0;
@@ -72,7 +71,7 @@
 	spi_tx.buffers = spi_tx_buf;
 	spi_tx.count = ARRAY_SIZE(spi_tx_buf);
 
-	status = spi_write_dt(&spi->bus, &spi_tx);
+	status = spi_write_dt(&spi->cfg->bus, &spi_tx);
 	if (status) {
 		LOG_ERR("SPI write error %d", status);
 	} else {
@@ -94,7 +93,7 @@
 	spi_rx.buffers = spi_rx_buf;
 	spi_rx.count = ARRAY_SIZE(spi_rx_buf);
 
-	status = spi_read_dt(&spi->bus, &spi_rx);
+	status = spi_read_dt(&spi->cfg->bus, &spi_rx);
 	if (status) {
 		LOG_ERR("SPI read error %d", status);
 	} else {
@@ -154,7 +153,7 @@
 	eswifi_spi_write(eswifi, cmd, clen);
 
 	/* Our device is flagged with SPI_HOLD_ON_CS|SPI_LOCK_ON, release */
-	spi_release_dt(&spi->bus);
+	spi_release_dt(&spi->cfg->bus);
 
 data:
 	/* CMD/DATA READY signals the Data Phase */
@@ -179,7 +178,7 @@
 	}
 
 	/* Our device is flagged with SPI_HOLD_ON_CS|SPI_LOCK_ON, release */
-	spi_release_dt(&spi->bus);
+	spi_release_dt(&spi->cfg->bus);
 
 	LOG_DBG("success");
 
@@ -244,7 +243,7 @@
 	gpio_pin_configure_dt(&cfg->dr, GPIO_INPUT);
 
 	/* SPI BUS */
-	if (!spi_is_ready(&spi->bus)) {
+	if (!spi_is_ready(&spi->cfg->bus)) {
 		LOG_ERR("SPI bus is not ready");
 		return -ENODEV;
 	};