dmaengine: zxdma: Support ZTE ZX296702 dma

Add ZTE ZX296702 dma controller support. Only
device tree probe is support currently.
Signed-off-by: Jun Nie <jun.nie@linaro.org>
Reviewed-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/Kconfig

@@ -458,6 +458,13 @@ config XGENE_DMA
 	select ASYNC_TX_ENABLE_CHANNEL_SWITCH
 	help
 	  Enable support for the APM X-Gene SoC DMA engine.
+config ZX_DMA
+	tristate "ZTE ZX296702 DMA support"
+	depends on ARCH_ZX
+	select DMA_ENGINE
+	select DMA_VIRTUAL_CHANNELS
+	help
+	  Support the DMA engine for ZTE ZX296702 platform devices.
 
 config DMA_ENGINE
 	bool

drivers/dma/Makefile

@@ -56,3 +56,4 @@ obj-$(CONFIG_NBPFAXI_DMA) += nbpfaxi.o
 obj-$(CONFIG_DMA_SUN6I) += sun6i-dma.o
 obj-$(CONFIG_IMG_MDC_DMA) += img-mdc-dma.o
 obj-$(CONFIG_XGENE_DMA) += xgene-dma.o
+obj-$(CONFIG_ZX_DMA) += zx296702_dma.o