DTS设备树的 '#' 符号含义求解！
bootbus: bootbus@1180000000000 {
+ compatible = "cavium,octeon-3860-bootbus";
+ reg = <0x11800 0x00000000 0x0 0x200>;
+ /* The chip select number and offset */
+ #address-cells = <2>;
+ /* The size of the chip select region */
+ #size-cells = <1>;
+ ranges = <0 00x0 0x1f4000000xc00000>,
+ <1 00x10000 0x300000000>,
+ <2 00x10000 0x400000000>,
+ <3 00x10000 0x500000000>,
+ <4 00x0 0x1d0200000x10000>,
+ <5 00x0 0x1d0400000x10000>,
+ <6 00x0 0x1d0500000x10000>,
+ <7 00x10000 0x900000000>;
代码如上，想请问：
#address-cells = <2>;
前面的井号‘#’ 表示什么意思？为什么要加这个井号？
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