Lorenzo Pieralisi | a0ae0240 | 2011-11-17 17:31:51 +0000 | [diff] [blame] | 1 | * ARM CPUs binding description |
| 2 | |
| 3 | The device tree allows to describe the layout of CPUs in a system through |
| 4 | the "cpus" node, which in turn contains a number of subnodes (ie "cpu") |
| 5 | defining properties for every cpu. |
| 6 | |
| 7 | Bindings for CPU nodes follow the ePAPR standard, available from: |
| 8 | |
| 9 | http://devicetree.org |
| 10 | |
| 11 | For 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 | |
| 48 | Example: |
| 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 | }; |