dmaengine: mpc512x: add device tree binding document

Introduce a device tree binding document for the MPC512x DMA controller

Signed-off-by: Alexander Popov <a13xp0p0v88@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/dma/mpc512x-dma.txt b/Documentation/devicetree/bindings/dma/mpc512x-dma.txt
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+* Freescale MPC512x and MPC8308 DMA Controller
+
+The DMA controller in Freescale MPC512x and MPC8308 SoCs can move
+blocks of memory contents between memory and peripherals or
+from memory to memory.
+
+Refer to "Generic DMA Controller and DMA request bindings" in
+the dma/dma.txt file for a more detailed description of binding.
+
+Required properties:
+- compatible: should be "fsl,mpc5121-dma" or "fsl,mpc8308-dma";
+- reg: should contain the DMA controller registers location and length;
+- interrupt for the DMA controller: syntax of interrupt client node
+        is described in interrupt-controller/interrupts.txt file.
+- #dma-cells: the length of the DMA specifier, must be <1>.
+        Each channel of this DMA controller has a peripheral request line,
+        the assignment is fixed in hardware. This one cell
+        in dmas property of a client device represents the channel number.
+
+Example:
+
+        dma0: dma@14000 {
+                compatible = "fsl,mpc5121-dma";
+                reg = <0x14000 0x1800>;
+                interrupts = <65 0x8>;
+                #dma-cells = <1>;
+        };
+
+DMA clients must use the format described in dma/dma.txt file.