tests: drivers: uart: Add test for async API using two instance

Add test which is using two independent UART devices. Validate behavior of
asynchronous API.

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

tests/drivers/uart/uart_async_dual/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(uart_async_dual)
+
+target_sources(app PRIVATE src/main.c)

tests/drivers/uart/uart_async_dual/Kconfig

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+# Copyright (c) 2024 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+config UART_ASYNC_DUAL_TEST_TIMEOUT
+	int "Single test case length (in milliseconds)"
+	# For the simulated devices, which are run by default in CI, we set it to less to not spend too
+	# much CI time
+	default 500 if SOC_SERIES_BSIM_NRFXX
+	default 3000
+	help
+	  For how many loops will the stress test run. The higher this number the longer the
+	  test and therefore the higher likelihood an unlikely race/event will be triggered.
+
+# Include Zephyr's Kconfig
+source "Kconfig"

tests/drivers/uart/uart_async_dual/boards/nrf54h20dk_nrf54h20_common.dtsi

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+/* SPDX-License-Identifier: Apache-2.0 */
+
+&pinctrl {
+	uart134_alt_default: uart134_alt_default {
+		group1 {
+			psels = <NRF_PSEL(UART_RX, 0, 6)>;
+				bias-pull-up;
+		};
+		group2 {
+			psels = <NRF_PSEL(UART_RTS, 0, 8)>;
+		};
+	};
+
+	uart134_alt_sleep: uart134_alt_sleep {
+		group1 {
+			psels = <NRF_PSEL(UART_RX, 0, 6)>,
+				<NRF_PSEL(UART_RTS, 0, 8)>;
+			low-power-enable;
+		};
+	};
+
+	uart137_alt_default: uart137_alt_default {
+		group1 {
+			psels = <NRF_PSEL(UART_TX, 0, 7)>;
+		};
+		group2 {
+			psels = <NRF_PSEL(UART_CTS, 0, 9)>;
+				bias-pull-up;
+		};
+	};
+
+	uart137_alt_sleep: uart137_alt_sleep {
+		group1 {
+			psels = <NRF_PSEL(UART_TX, 0, 7)>,
+				<NRF_PSEL(UART_CTS, 0, 9)>;
+			low-power-enable;
+		};
+	};
+};
+
+dut: &uart134 {
+	status = "okay";
+	current-speed = <115200>;
+	pinctrl-0 = <&uart134_alt_default>;
+	pinctrl-1 = <&uart134_alt_sleep>;
+	pinctrl-names = "default", "sleep";
+	hw-flow-control;
+};
+
+dut_aux: &uart137 {
+	status = "okay";
+	current-speed = <115200>;
+	pinctrl-0 = <&uart137_alt_default>;
+	pinctrl-1 = <&uart137_alt_sleep>;
+	pinctrl-names = "default", "sleep";
+	hw-flow-control;
+};
+
+&timer137 {
+	status = "okay";
+	interrupts = <467 0>;
+};
+
+/ {
+	busy-sim {
+		compatible = "vnd,busy-sim";
+		status = "okay";
+		counter = <&timer137>;
+	};
+};

tests/drivers/uart/uart_async_dual/boards/nrf54h20dk_nrf54h20_cpuapp.overlay

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+/* SPDX-License-Identifier: Apache-2.0 */
+
+#include "nrf54h20dk_nrf54h20_common.dtsi"
+
+&dut {
+	memory-regions = <&cpuapp_dma_region>;
+};
+
+&dut_aux {
+	memory-regions = <&cpuapp_dma_region>;
+};

tests/drivers/uart/uart_async_dual/boards/nrf54l15pdk_nrf54l15_cpuapp.overlay

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+/* SPDX-License-Identifier: Apache-2.0 */
+
+&pinctrl {
+	uart21_default: uart21_default {
+		group1 {
+			psels = <NRF_PSEL(UART_RX, 1, 8)>;
+				bias-pull-up;
+		};
+		group2 {
+			psels = <NRF_PSEL(UART_RTS, 1, 10)>;
+		};
+	};
+
+	uart21_sleep: uart21_sleep {
+		group1 {
+			psels = <NRF_PSEL(UART_RX, 1, 8)>,
+				<NRF_PSEL(UART_RTS, 1, 10)>;
+			low-power-enable;
+		};
+	};
+
+	uart22_default: uart22_default {
+		group1 {
+			psels = <NRF_PSEL(UART_TX, 1, 9)>;
+		};
+		group2 {
+			psels = <NRF_PSEL(UART_CTS, 1, 11)>;
+				bias-pull-up;
+		};
+	};
+
+	uart22_sleep: uart22_sleep {
+		group1 {
+			psels = <NRF_PSEL(UART_TX, 1, 9)>,
+				<NRF_PSEL(UART_CTS, 1, 11)>;
+			low-power-enable;
+		};
+	};
+};
+
+dut: &uart21 {
+	status = "okay";
+	current-speed = <115200>;
+	pinctrl-0 = <&uart21_default>;
+	pinctrl-1 = <&uart21_sleep>;
+	pinctrl-names = "default", "sleep";
+	hw-flow-control;
+};
+
+dut_aux: &uart22 {
+	status = "okay";
+	current-speed = <115200>;
+	pinctrl-0 = <&uart22_default>;
+	pinctrl-1 = <&uart22_sleep>;
+	pinctrl-names = "default", "sleep";
+	hw-flow-control;
+};
+
+&timer20 {
+	status = "okay";
+	interrupts = <202 0>;
+};
+
+/ {
+	busy-sim {
+		compatible = "vnd,busy-sim";
+		status = "okay";
+		counter = <&timer20>;
+	};
+};

tests/drivers/uart/uart_async_dual/prj.conf

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+CONFIG_ZTEST=y
+CONFIG_TEST_BUSY_SIM=y
+CONFIG_RING_BUFFER=y
+CONFIG_TEST_RANDOM_GENERATOR=y
+CONFIG_SERIAL=y
+CONFIG_UART_ASYNC_API=y
+CONFIG_UART_USE_RUNTIME_CONFIGURE=y