Device-tree binding documentation for Xilinx zynqmp dma engine used in
Zynq UltraScale+ MPSoC.
Signed-off-by: Punnaiah Choudary Kalluri <punnaia@xxxxxxxxxx>
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Changes in v2:
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.../devicetree/bindings/dma/xilinx/zynqmp_dma.txt | 61 ++++++++++++++++++++
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+Xilinx ZynqMP DMA engine, it does support memory to memory transfers,
+memory to device and device to memory transfers. It also has flow
+control and rate control support for slave/peripheral dma access.
+
+Required properties:
+- compatible: Should be "xlnx,zynqmp-dma-1.0"
+- #dma-cells: Should be <1>, a single cell holding a line request number
+- reg: Memory map for module access
+- interrupt-parent: Interrupt controller the interrupt is routed through
+- interrupts: Should contain DMA channel interrupt
+- xlnx,bus-width: AXI buswidth in bits. Should contain 128 or 64
+
+Optional properties:
+- xlnx,include-sg: Indicates the controller to operate in simple or scatter
+ gather dma mode
+- xlnx,ratectrl: Scheduling interval in terms of clock cycles for
+ source AXI transaction
+- xlnx,overfetch: Tells whether the channel is allowed to over fetch the data
+- xlnx,src-issue: Number of AXI outstanding transactions on source side
+- xlnx,desc-axi-cohrnt: Tells whether the AXI transactions generated for the
+ descriptor read are marked Non-coherent
+- xlnx,src-axi-cohrnt: Tells whether the AXI transactions generated for the
+ source descriptor payload are marked Non-coherent
+- xlnx,dst-axi-cohrnt: Tells whether the AXI transactions generated for the
+ dst descriptor payload are marked Non-coherent
+- xlnx,desc-axi-qos: AXI QOS bits to be used for descriptor fetch
+- xlnx,src-axi-qos: AXI QOS bits to be used for data read
+- xlnx,dst-axi-qos: AXI QOS bits to be used for data write
+- xlnx,desc-axi-cache: AXI cache bits to be used for descriptor fetch.
+- xlnx,desc-axi-cache: AXI cache bits to be used for data read
+- xlnx,desc-axi-cache: AXI cache bits to be used for data write
+- xlnx,src-burst-len: AXI length for data read. Support only power of 2 values
+ i.e 1,2,4,8 and 16
+- xlnx,dst-burst-len: AXI length for data write. Support only power of 2 values
+ i.e 1,2,4,8 and 16
+
+Example:
+++++++++
+fpd_dma_chan1: dma@FD500000 {
+ compatible = "xlnx,zynqmp-dma-1.0";
+ reg = <0x0 0xFD500000 0x1000>;
+ #dma_cells = <1>;
+ interrupt-parent = <&gic>;
+ interrupts = <0 117 4>;
+ xlnx,bus-width = <128>;
+ xlnx,include-sg;
+ xlnx,overfetch;
+ xlnx,ratectrl = <0>;
+ xlnx,src-issue = <16>;
+ xlnx,desc-axi-cohrnt;
+ xlnx,src-axi-cohrnt;
+ xlnx,dst-axi-cohrnt;
+ xlnx,desc-axi-qos = <0>;
+ xlnx,desc-axi-cache = <0>;
+ xlnx,src-axi-qos = <0>;
+ xlnx,src-axi-cache = <2>;
+ xlnx,dst-axi-qos = <0>;
+ xlnx,dst-axi-cache = <2>;
+ xlnx,src-burst-len = <4>;
+ xlnx,dst-burst-len = <4>;
+};
--
1.7.4
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