Using udmabuf on linux zynq7020

[lone-boy]

Hello, I want to use udmabuf for dma like function. The ddr on the PL side allocates a section of space, the PL writes data into it, and then the PS section reads it. But when I write device tree like this reserved-memory {

address-cells = <2>;

    #size-cells = <2>;
    ranges;
    image_buf0: image_buf@0 {
        compatible = "shared-dma-pool";
        reusable;
        reg = <0x0 0x32000000 0x0 0x33000000>;
        alignment = <0x0 0x1000>;
        label = "image_buf0";
    };
};

udmabuf@0{
    compatible = "ikwzm,u-dma-buf";
    device-name = "udmabuf0";
    size = <0x01000000>;
    memory-region = <&image_buf0>;
};

dmesg | grep udma u-dma-buf udmabuf@0: of_reserved_mem_device_init failed. return=-22 u-dma-buf udmabuf@0: driver probe failed. return=-22 u-dma-buf: probe of udmabuf@0 failed with error -22

[ikwzm]

Thanks for the issue.

I assume reserved-memory initialization has failed, please check dmesg.

[ikwzm]

Please see issue #45.

[lone-boy]

That's really nice, thank you very much