test: drivers: build_all: add cdns uart build only test

As the cadence uart, has no off-the-shelve microprocessor out there.
Add a build only test case for the cadence uart using the qemu cortex
m3 as the board.

Signed-off-by: Ryan McClelland <ryanmcclelland@meta.com>

MAINTAINERS.yml

@@ -1304,6 +1304,7 @@ Release Notes:
     - dts/bindings/serial/
     - samples/drivers/uart/
     - tests/drivers/uart/
+    - tests/drivers/build_all/uart/
     - doc/hardware/peripherals/uart.rst
   labels:
     - "area: UART"

tests/drivers/build_all/uart/CMakeLists.txt

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(build_all)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/drivers/build_all/uart/boards/qemu_cortex_m3.overlay

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2023 Meta Platforms
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+ / {
+	uart3: uart@88888888 {
+		compatible = "cdns,uart";
+		reg = <0x88888888 0x400>;
+		interrupt-parent = <&nvic>;
+		interrupts = <4 1>;
+		clock-frequency = <100000000>;
+		current-speed = <921600>;
+		bdiv = <4>;
+		parity = "none";
+	};
+};

tests/drivers/build_all/uart/prj.conf

@@ -0,0 +1,3 @@
+CONFIG_TEST=y
+CONFIG_TEST_USERSPACE=y
+CONFIG_SERIAL=y

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

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2023 Meta Platforms
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+int main(void)
+{
+	return 0;
+}

tests/drivers/build_all/uart/testcase.yaml

@@ -0,0 +1,12 @@
+common:
+  build_only: true
+  tags:
+    - drivers
+    - uart
+tests:
+  drivers.uart.build:
+    # will cover drivers without in-tree boards
+    platform_allow: qemu_cortex_m3
+    tags: uart_cdns
+    extra_configs:
+      - CONFIG_SERIAL=y