drivers: dma: siwx917: Add additional test for DMA driver

chan_blen_transfer test case in Zephyr upstream can be used to
validate the siwx917 DMA driver. This test transfers a simple
48-byte of characters on two different channels. The added test
(udma_tests) leverages the existing chan_blen_transfer test case.
This additional test transfers large amounts of data with different
data sizes (8-bit, 16-bit, and 32-bit) and verifies the reload
function. This test case does not need to be pushed upstream.
It can only reside in Downstream.

Signed-off-by: Sai Santhosh Malae <[email protected]>

tests/drivers/dma/udma_tests/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(chan_blen_transfer)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/drivers/dma/udma_tests/Kconfig

@@ -0,0 +1,18 @@
+#Copyright (c) 2024 Silicon Laboratories Inc.
+#SPDX-License-Identifier: Apache-2.0
+
+mainmenu "DMA Loop Transfer Test"
+
+source "Kconfig.zephyr"
+
+config DMA_TRANSFER_CHANNEL_NR_0
+	int "first DMA channel to use"
+	default 0
+
+config DMA_TRANSFER_CHANNEL_NR_1
+	int "second DMA channel to use"
+	default 1
+
+config DMA_LOOP_TRANSFER_NUMBER_OF_DMAS
+	int "Number of DMAs to test"
+	default 1

tests/drivers/dma/udma_tests/boards/siwx917_rb4338a.conf

@@ -0,0 +1,2 @@
+CONFIG_DMA_TRANSFER_CHANNEL_NR_0=1
+CONFIG_DMA_TRANSFER_CHANNEL_NR_1=2

tests/drivers/dma/udma_tests/boards/siwx917_rb4338a.overlay

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2024 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&udma0
+{
+	status = "okay";
+};
+
+tst_dma0: &udma0{};

tests/drivers/dma/udma_tests/prj.conf

@@ -0,0 +1,4 @@
+CONFIG_DMA=y
+CONFIG_ZTEST=y
+CONFIG_LOG=y
+CONFIG_DMA_LOG_LEVEL_INF=y

tests/drivers/dma/udma_tests/src/main.c

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2024 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/ztest.h>
+
+ZTEST_SUITE(dma_m2m, NULL, NULL, NULL, NULL, NULL);