dmaengine: Add hisilicon k3 DMA engine driver

Add dmaengine driver for hisilicon k3 platform based on virt_dma

Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Kai Yang <jean.yangkai@huawei.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/dma/k3dma.txt b/Documentation/devicetree/bindings/dma/k3dma.txt
new file mode 100644
index 000000000000..23f8d712c3ce
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/k3dma.txt
@@ -0,0 +1,46 @@
+* Hisilicon K3 DMA controller
+
+See dma.txt first
+
+Required properties:
+- compatible: Should be "hisilicon,k3-dma-1.0"
+- reg: Should contain DMA registers location and length.
+- interrupts: Should contain one interrupt shared by all channel
+- #dma-cells: see dma.txt, should be 1, para number
+- dma-channels: physical channels supported
+- dma-requests: virtual channels supported, each virtual channel
+                have specific request line
+- clocks: clock required
+
+Example:
+
+Controller:
+                dma0: dma@fcd02000 {
+                        compatible = "hisilicon,k3-dma-1.0";
+                        reg = <0xfcd02000 0x1000>;
+                        #dma-cells = <1>;
+                        dma-channels = <16>;
+                        dma-requests = <27>;
+                        interrupts = <0 12 4>;
+                        clocks = <&pclk>;
+                        status = "disable";
+                };
+
+Client:
+Use specific request line passing from dmax
+For example, i2c0 read channel request line is 18, while write channel use 19
+
+                i2c0: i2c@fcb08000 {
+                        compatible = "snps,designware-i2c";
+                        dmas =  <&dma0 18          /* read channel */
+                                 &dma0 19>;        /* write channel */
+                        dma-names = "rx", "tx";
+                };
+
+                i2c1: i2c@fcb09000 {
+                        compatible = "snps,designware-i2c";
+                        dmas =  <&dma0 20          /* read channel */
+                                 &dma0 21>;        /* write channel */
+                        dma-names = "rx", "tx";
+                };
+