tests: drivers: uart: mix_fifo_poll: Rework to support multi-instance

Rework test to allow testing multiple UART instances in a single
run.

Signed-off-by: Krzysztof Chruściński <[email protected]>

Author: nordic-krch

tests/drivers/uart/uart_mix_fifo_poll/src/main.c

@@ -42,6 +42,18 @@ struct rx_source {
 	uint8_t prev;
 };
 
+struct dut_data {
+	const struct device *dev;
+	const char *name;
+};
+
+static struct dut_data duts[] = {
+	{
+		.dev = DEVICE_DT_GET(UART_NODE),
+		.name = DT_NODE_FULL_NAME(UART_NODE),
+	},
+};
+
 #define BUF_SIZE 16
 
 /* Buffer used for polling. */
@@ -68,8 +80,7 @@ static struct test_data int_async_data;
 
 static const struct device *const counter_dev =
 	DEVICE_DT_GET(COUNTER_NODE);
-static const struct device *const uart_dev =
-	DEVICE_DT_GET(UART_NODE);
+static const struct device *uart_dev;
 
 static bool async;
 static bool int_driven;
@@ -112,8 +123,10 @@ static void process_byte(uint8_t b)
 	src->prev = b;
 }
 
+static volatile bool in_counter_isr;
 static void counter_top_handler(const struct device *dev, void *user_data)
 {
+	in_counter_isr = true;
 	static bool enable = true;
 	static uint8_t async_rx_buf[4];
 
@@ -139,9 +152,10 @@ static void counter_top_handler(const struct device *dev, void *user_data)
 			process_byte(c);
 		}
 	}
+	in_counter_isr = false;
 }
 
-static void init_test(void)
+static void init_test(int idx)
 {
 	int err;
 	struct counter_top_cfg top_cfg = {
@@ -150,6 +164,12 @@ static void init_test(void)
 		.flags = 0
 	};
 
+	memset(source, 0, sizeof(source));
+	error_found = false;
+	async_rx_enabled = false;
+	uart_dev = duts[idx].dev;
+	TC_PRINT("UART instance:%s\n", duts[idx].name);
+
 	zassert_true(device_is_ready(uart_dev), "uart device is not ready");
 
 	if (uart_callback_set(uart_dev, async_callback, NULL) == 0) {
@@ -388,10 +408,21 @@ ZTEST(uart_mix_fifo_poll, test_mixed_uart_access)
 
 void *uart_mix_setup(void)
 {
-	init_test();
+	static int idx;
+
+	init_test(idx++);
 
 	return NULL;
 }
 
 ZTEST_SUITE(uart_mix_fifo_poll, NULL, uart_mix_setup,
 		NULL, NULL, NULL);
+
+void test_main(void)
+{
+	/* Run all suites for each dut UART. Setup function for each suite is picking
+	 * next UART from the array.
+	 */
+	ztest_run_all(NULL, false, ARRAY_SIZE(duts), 1);
+	ztest_verify_all_test_suites_ran();
+}