udmabuf with loop back example

Hi guys I'm trying to use udmabuf on a simple loopback design here is my device tree that I plan to use:

Do I need to define memory region of udmabuf nodes for RX and TX dma channels?

I dont understand how the uio device would do the DMA trasanctions and how udmabuf will help?

Does my device tree make sense at all? `

/ {
    /* Loopback DMA setup */

    loopback_dma: axidma@40400000 {
        compatible = "generic-uio";
        #dma-cells = <1>;
        reg = < 0x40400000 0x10000 >;
        clocks = <&clkc 15>, <&clkc 15>, <&clkc 15>, <&clkc 15>; // fclk0 from clock controller
        clock-names = "s_axi_lite_aclk", "m_axi_mm2s_aclk", "m_axi_s2mm_aclk", "m_axi_sg_aclk";
        xlnx,include-sg;

        loopback_dma_mm2s_chan: dma-channel@40400000 {
            compatible = "xlnx,axi-dma-mm2s-channel";
            interrupt-parent = <&intc>;
            interrupts = <0 31 4>; 
            xlnx,datawidth = <0x20>;        
            xlnx,sg-length-width = <14>;    

            xlnx,device-id = <0x1>;     
        };

        loopback_dma_s2mm_chan: dma-channel@40400030 {
            compatible = "xlnx,axi-dma-s2mm-channel";
            interrupt-parent = <&intc>;
            interrupts = <0 32 4>; 
            xlnx,datawidth = <0x20>;       
            xlnx,sg-length-width = <14>;    
            xlnx,device-id = <0x1>;     
        };
    };

udmabuf@0x00 {
            compatible = "ikwzm,udmabuf-0.10.a";
            device-name = "udmabuf0";
            minor-number = <0>;
            size = <0x00100000>;
                        sync-direction = <1>; //TX
        };
udmabuf@0x01 {
            compatible = "ikwzm,udmabuf-0.10.a";
            device-name = "udmabuf1";
            minor-number = <0>;
            size = <0x00100000>;
                        sync-direction = <2>; //RX
        };

};
`

Thaks for your time, :100:

ikwzm / udmabuf

udmabuf with loop back example #35