dmaengine: xilinx: Add vdmatest test client code

The code is used for axivdma validation. It is using dma_slave_config
generic API and of_dma framework in dma test client with support to
read number of frame stores from device node.

Driver is capable to test multiple instances if present
in the hardware design.

Make the horizontal and vertical length configurable. This allows
VDMA IP to be validated for all supported resolution.

Avoid enabling circular_park mode for S2MM as it might happen that engine
continuously circles through frame buffers w/o being programmed and lead
to an undesired hang. In loopback it is recommended to use same park mode
configuration for both channels.

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

drivers/dma/Kconfig

@@ -763,4 +763,11 @@ config XILINX_DMATEST
 	  Simple DMA test client. Say N unless you're debugging a
 	  DMA Device driver.
 
+config XILINX_VDMATEST
+	tristate "DMA Test client for VDMA"
+	depends on XILINX_DMA
+	help
+	  Simple xilinx VDMA test client. Say N unless you're debugging a
+	  DMA Device driver.
+
 endif

drivers/dma/xilinx/Makefile

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_XILINX_DMATEST) += axidmatest.o
+obj-$(CONFIG_XILINX_VDMATEST) += vdmatest.o
 obj-$(CONFIG_XILINX_DMA) += xilinx_dma.o
 obj-$(CONFIG_XILINX_ZYNQMP_DMA) += zynqmp_dma.o
 obj-$(CONFIG_XILINX_ZYNQMP_DPDMA) += xilinx_dpdma.o