tests: drivers: spi: add build all for cadence spi

As there is no currently known board that has the cadence spi,
add a test to just build it under the qemu cortex m3.

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

Author: XenuIsWatching

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

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2025 Meta Platforms
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	spi0: spi@88888888 {
+		compatible = "cdns,spi";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0x88888888 0x400>;
+		interrupt-parent = <&nvic>;
+		interrupts = <4 1>;
+		fifo-width = <8>;
+		rx-fifo-depth = <256>;
+		tx-fifo-depth = <256>;
+		clock-frequency = <100000000>;
+	};
+};

tests/drivers/build_all/spi/prj.conf

@@ -0,0 +1,5 @@
+CONFIG_TEST=y
+CONFIG_TEST_USERSPACE=y
+CONFIG_SPI=y
+CONFIG_SPI_SLAVE=y
+CONFIG_SPI_CDNS=y

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

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2025 Meta Platforms
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+int main(void)
+{
+	return 0;
+}

tests/drivers/build_all/spi/testcase.yaml

@@ -0,0 +1,11 @@
+common:
+  build_only: true
+  tags:
+    - drivers
+    - spi
+tests:
+  drivers.spi.build:
+    # will cover drivers without in-tree boards
+    platform_allow: qemu_cortex_m3
+    tags: spi_cdns
+    extra_args: "CONFIG_SPI=y"