dma: xilinx: Add Display Port DMA driver

Display Port (DP) has own dma driver that's why add this skeleton driver
only for handling power domain setting and send configuration object to
PMUFW to enable it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/fe8bc313bcd430b04e9fa6fb770d5799ef28b350.1645627920.git.michal.simek@xilinx.com
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 9cacea8..0af5460 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -68,6 +68,13 @@
 	help
 	  Enable APBH DMA driver.
 
+config XILINX_DPDMA
+	bool "Enable ZynqMP Display Port DMA driver"
+	depends on DMA && ZYNQMP_POWER_DOMAIN
+	help
+	  Enable support for Xilinx ZynqMP Display DMA driver. Currently
+	  this file is used as placeholder for driver. The main reason is
+	  to record compatible string and calling power domain driver.
 
 if APBH_DMA
 config APBH_DMA_BURST