what is meaning of "linux.phandle" in P1020RDB DTS

[hyoungkikim]

in P1020RDB DTS   there are  "linux.phandle" and phandle

what is that mean ?    i just know   phande=&label sentence

but what is a number ?

thansk you

  mdio@24000 {
   #address-cells = <0x1>;
   #size-cells = <0x0>;
   compatible = "fsl,etsec2-mdio";
   reg = <0x24000 0x1000 0xb0030 0x4>;

   ethernet-phy@0 {
    interrupts = <0x3 0x1 0x0 0x0>;
    reg = <0x0>;
   linux,phandle = <0x5>;
    phandle = <0x5>;
   };

   ethernet-phy@1 {
    interrupts = <0x2 0x1 0x0 0x0>;
    reg = <0x1>;
    linux,phandle = <0x8>;
    phandle = <0x8>;
   };
  };

  mdio@25000 {
   #address-cells = <0x1>;
   #size-cells = <0x0>;
   compatible = "fsl,etsec2-tbi";
   reg = <0x25000 0x1000 0xb1030 0x4>;

   tbi-phy@11 {
    reg = <0x11>;
    device_type = "tbi-phy";
    linux,phandle = <0x6>;
    phandle = <0x6>;
   };
  };

[ufedor]

Please refer to the "booting-without-of.txt" (Linux/Documentation/devicetree/booting-without-of.txt - Linux Cross Reference - Free Electrons):

"574 The "phandle" property is a 32-bit value that uniquely

575 identifies a node. You are free to use whatever values or system of

576 values, internal pointers, or whatever to generate these, the only

577 requirement is that every node for which you provide that property has

578 a unique value for it."