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Documentation: DT: vdma: update binding doc for AXI DMA
This patch updates the device-tree binding doc for adding support for AXI DMA. Also this patch differentiates required properties b/w DMA and VDMA. Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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@ -3,20 +3,28 @@ It can be configured to have one channel or two channels. If configured
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as two channels, one is to transmit to the video device and another is
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to receive from the video device.
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Xilinx AXI DMA engine, it does transfers between memory and AXI4 stream
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target devices. It can be configured to have one channel or two channels.
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If configured as two channels, one is to transmit to the device and another
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is to receive from the device.
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Required properties:
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- compatible: Should be "xlnx,axi-vdma-1.00.a"
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- compatible: Should be "xlnx,axi-vdma-1.00.a" or "xlnx,axi-dma-1.00.a"
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- #dma-cells: Should be <1>, see "dmas" property below
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- reg: Should contain VDMA registers location and length.
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- xlnx,num-fstores: Should be the number of framebuffers as configured in h/w.
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- xlnx,addrwidth: Should be the vdma addressing size in bits(ex: 32 bits).
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- dma-ranges: Should be as the following <dma_addr cpu_addr max_len>.
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- dma-channel child node: Should have at least one channel and can have up to
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two channels per device. This node specifies the properties of each
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DMA channel (see child node properties below).
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Required properties for VDMA:
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- xlnx,num-fstores: Should be the number of framebuffers as configured in h/w.
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Optional properties:
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- xlnx,include-sg: Tells configured for Scatter-mode in
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the hardware.
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Optional properties for VDMA:
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- xlnx,flush-fsync: Tells which channel to Flush on Frame sync.
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It takes following values:
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{1}, flush both channels
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@ -33,6 +41,7 @@ Required child node properties:
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Optional child node properties:
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- xlnx,include-dre: Tells hardware is configured for Data
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Realignment Engine.
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Optional child node properties for VDMA:
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- xlnx,genlock-mode: Tells Genlock synchronization is
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enabled/disabled in hardware.
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