tests: boards: neorv32: add build_all test for the NEORV32

Add a dedicated "build_all" test for the NEORV32 and its peripheral
drivers. These drivers depend on the NEORV32 SYSINFO (syscon) and thus
cannot easily be built for non-NEORV32 board targets.

Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>

MAINTAINERS.yml

@@ -2760,8 +2760,11 @@ NEORV32 platform:
     - drivers/*/*neorv32*
     - dts/bindings/*/*neorv32*
     - soc/neorv32/
+    - tests/boards/neorv32/
   labels:
     - "platform: NEORV32"
+  tests:
+    - boards.neorv32
 
 OSDP:
   status: maintained

tests/boards/neorv32/build_all/CMakeLists.txt

@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright (c) 2025 Henrik Brix Andersen <henrik@brixandersen.dk>
+
+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(build_all_neorv32)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/boards/neorv32/build_all/app.overlay

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2025 Henrik Brix Andersen <henrik@brixandersen.dk>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&gpio {
+	status = "okay";
+	ngpios = <32>;
+};
+
+&trng {
+	status = "okay";
+};
+
+&uart0 {
+	status = "okay";
+	current-speed = <19200>;
+};
+
+&uart1 {
+	status = "okay";
+	current-speed = <115200>;
+};

tests/boards/neorv32/build_all/prj.conf

@@ -0,0 +1,9 @@
+CONFIG_TEST=y
+CONFIG_TEST_USERSPACE=y
+
+CONFIG_GPIO=y
+CONFIG_ENTROPY_GENERATOR=y
+
+CONFIG_SERIAL=y
+CONFIG_UART_INTERRUPT_DRIVEN=y
+CONFIG_UART_USE_RUNTIME_CONFIGURE=y

tests/boards/neorv32/build_all/src/main.c

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2025 Henrik Brix Andersen <henrik@brixandersen.dk>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+int main(void)
+{
+	return 0;
+}

tests/boards/neorv32/build_all/testcase.yaml

@@ -0,0 +1,11 @@
+tests:
+  boards.neorv32.build_all:
+    build_only: true
+    tags:
+      - drivers
+      - entropy
+      - gpio
+      - uart
+    platform_allow: neorv32/neorv32/minimalboot
+    integration_platforms:
+      - neorv32/neorv32/minimalboot