[nrf fromlist] tests: drivers: spi: loopback: test device_deinit

Introduce test for device_deinit() which deinitializes the spi
bus, then configures miso as input, mosi as output using gpio,
utilizing the loopback to test directly controlling the pins.
Then reinit the spi device.

Upstream PR #: 91956

Signed-off-by: Bjarki Arge Andreasen <[email protected]>

Author: bjarki-andreasen

tests/drivers/spi/spi_loopback/src/spi.c

@@ -16,6 +16,7 @@
 #include <zephyr/ztest.h>
 #include <zephyr/drivers/spi.h>
 #include <zephyr/pm/device_runtime.h>
+#include <zephyr/drivers/gpio.h>
 #include <zephyr/kernel.h>
 #include <stdio.h>
 #include <stdarg.h>
@@ -56,7 +57,8 @@ static int spec_idx;
  */
 struct spi_dt_spec spec_copies[5];
 
-
+const struct gpio_dt_spec miso_pin = GPIO_DT_SPEC_GET_OR(DT_PATH(zephyr_user), miso_gpios, {});
+const struct gpio_dt_spec mosi_pin = GPIO_DT_SPEC_GET_OR(DT_PATH(zephyr_user), mosi_gpios, {});
 
 /*
  ********************
@@ -806,6 +808,35 @@ ZTEST(spi_loopback, test_spi_concurrent_transfer_different_spec)
 	test_spi_concurrent_transfer_helper(specs);
 }
 
+ZTEST(spi_loopback, test_spi_deinit)
+{
+	struct spi_dt_spec *spec = loopback_specs[0];
+	const struct device *dev = spec->bus;
+	int ret;
+
+	if (miso_pin.port == NULL || mosi_pin.port == NULL) {
+		TC_PRINT("  zephyr,user miso-gpios or mosi-gpios are not defined\n");
+		ztest_test_skip();
+	}
+
+	ret = device_deinit(dev);
+	if (ret == -ENOTSUP) {
+		TC_PRINT("  device deinit not supported\n");
+		ztest_test_skip();
+	}
+
+	zassert_ok(ret);
+	zassert_ok(gpio_pin_configure_dt(&miso_pin, GPIO_INPUT));
+	zassert_ok(gpio_pin_configure_dt(&mosi_pin, GPIO_OUTPUT_INACTIVE));
+	zassert_equal(gpio_pin_get_dt(&miso_pin), 0);
+	zassert_ok(gpio_pin_set_dt(&mosi_pin, 1));
+	zassert_equal(gpio_pin_get_dt(&miso_pin), 1);
+	zassert_ok(gpio_pin_set_dt(&mosi_pin, 0));
+	zassert_equal(gpio_pin_get_dt(&miso_pin), 0);
+	zassert_ok(gpio_pin_configure_dt(&mosi_pin, GPIO_INPUT));
+	zassert_ok(device_init(dev));
+}
+
 #if (CONFIG_SPI_ASYNC)
 static struct k_poll_signal async_sig = K_POLL_SIGNAL_INITIALIZER(async_sig);
 static struct k_poll_event async_evt =