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Linux/AM5728: node properties in device tree file

rav venkat
Intellectual 820 points
Part Number: AM5728

Tool/software: Linux

Hai,

I am seeing am57xx-beagle-x15-common.dtsi file. I am unable to understand the property declaration of reserved memory node in this file:

*************************************************************************

reserved-memory {
        #address-cells = <2>;
        #size-cells = <2>;
        ranges;

        ipu2_memory_region: ipu2-memory@95800000 {
            compatible = "shared-dma-pool";
            reg = <0x0 0x95800000 0x0 0x3800000>;
            reusable;
            status = "okay";
        };

        dsp1_memory_region: dsp1-memory@99000000 {
            compatible = "shared-dma-pool";
            reg = <0x0 0x99000000 0x0 0x4000000>;
            reusable;
            status = "okay";
        };

        ipu1_memory_region: ipu1-memory@9d000000 {
            compatible = "shared-dma-pool";
            reg = <0x0 0x9d000000 0x0 0x2000000>;
            reusable;
            status = "okay";
        };

*******************************************************************

address-cells---property is usually given <0x1> value but here it is <0x2> can you help me with some explanation. Also, the same problem with size-cell property.

Thanks & Regards,

Venkatesh R.