dmaengine: xilinx: Add axidmatest test client code

The code is used for axidma validation. It is using dma_slave_config
generic API and of_dma framework in dma test client. The driver is
capable to test multiple instances if present in the hardware design.

Signed-off-by: Appana Durga Kedareswara Rao <appana.durga.rao@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
State: not-upstreamable

drivers/dma/Kconfig

@@ -756,4 +756,11 @@ config DMATEST
 config DMA_ENGINE_RAID
 	bool
 
+config XILINX_DMATEST
+	tristate "DMA Test client for AXI DMA"
+	depends on XILINX_DMA
+	help
+	  Simple DMA test client. Say N unless you're debugging a
+	  DMA Device driver.
+
 endif

drivers/dma/xilinx/Makefile

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_XILINX_DMATEST) += axidmatest.o
 obj-$(CONFIG_XILINX_DMA) += xilinx_dma.o
 obj-$(CONFIG_XILINX_ZYNQMP_DMA) += zynqmp_dma.o
 obj-$(CONFIG_XILINX_ZYNQMP_DPDMA) += xilinx_dpdma.o