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Signed-off-by: Punnaiah Choudary Kalluri --- Changes in v3: - None Changes in v2: - None --- .../devicetree/bindings/dma/xilinx/zynqmp_dma.txt | 61 ++++++++++++++++++++ 1 files changed, 61 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/dma/xilinx/zynqmp_dma.txt diff --git a/Documentation/devicetree/bindings/dma/xilinx/zynqmp_dma.txt b/Documentation/devicetree/bindings/dma/xilinx/zynqmp_dma.txt new file mode 100644 index 0000000..e4f92b9 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/xilinx/zynqmp_dma.txt @@ -0,0 +1,61 @@ +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>; +};