linux/Documentation/devicetree/bindings/arm/cpus.txt
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   1* ARM CPUs binding description
   2
   3The device tree allows to describe the layout of CPUs in a system through
   4the "cpus" node, which in turn contains a number of subnodes (ie "cpu")
   5defining properties for every cpu.
   6
   7Bindings for CPU nodes follow the ePAPR standard, available from:
   8
   9http://devicetree.org
  10
  11For the ARM architecture every CPU node must contain the following properties:
  12
  13- device_type:  must be "cpu"
  14- reg:          property matching the CPU MPIDR[23:0] register bits
  15                reg[31:24] bits must be set to 0
  16- compatible:   should be one of:
  17                "arm,arm1020"
  18                "arm,arm1020e"
  19                "arm,arm1022"
  20                "arm,arm1026"
  21                "arm,arm720"
  22                "arm,arm740"
  23                "arm,arm7tdmi"
  24                "arm,arm920"
  25                "arm,arm922"
  26                "arm,arm925"
  27                "arm,arm926"
  28                "arm,arm940"
  29                "arm,arm946"
  30                "arm,arm9tdmi"
  31                "arm,cortex-a5"
  32                "arm,cortex-a7"
  33                "arm,cortex-a8"
  34                "arm,cortex-a9"
  35                "arm,cortex-a15"
  36                "arm,arm1136"
  37                "arm,arm1156"
  38                "arm,arm1176"
  39                "arm,arm11mpcore"
  40                "faraday,fa526"
  41                "intel,sa110"
  42                "intel,sa1100"
  43                "marvell,feroceon"
  44                "marvell,mohawk"
  45                "marvell,xsc3"
  46                "marvell,xscale"
  47
  48Example:
  49
  50        cpus {
  51                #size-cells = <0>;
  52                #address-cells = <1>;
  53
  54                CPU0: cpu@0 {
  55                        device_type = "cpu";
  56                        compatible = "arm,cortex-a15";
  57                        reg = <0x0>;
  58                };
  59
  60                CPU1: cpu@1 {
  61                        device_type = "cpu";
  62                        compatible = "arm,cortex-a15";
  63                        reg = <0x1>;
  64                };
  65
  66                CPU2: cpu@100 {
  67                        device_type = "cpu";
  68                        compatible = "arm,cortex-a7";
  69                        reg = <0x100>;
  70                };
  71
  72                CPU3: cpu@101 {
  73                        device_type = "cpu";
  74                        compatible = "arm,cortex-a7";
  75                        reg = <0x101>;
  76                };
  77        };
  78