Here you can see a device tree of Linux MIPS64 running on virtual QEMU Malta board:
# dtc -I fs -O dts /proc/device-tree
Warning (unit_address_vs_reg): Node /isa has a reg or ranges property, but no unit name
Warning (unit_address_vs_reg): Node /interrupt-controller@20 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /memory has a reg or ranges property, but no unit name
/dts-v1/;
/ {
compatible = "mti,malta";