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diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt deleted file mode 100644 index b0198a1cf403..000000000000 --- a/Documentation/devicetree/bindings/arm/cpus.txt +++ /dev/null @@ -1,490 +0,0 @@ -================= -ARM CPUs bindings -================= - -The device tree allows to describe the layout of CPUs in a system through -the "cpus" node, which in turn contains a number of subnodes (ie "cpu") -defining properties for every cpu. - -Bindings for CPU nodes follow the Devicetree Specification, available from: - -https://www.devicetree.org/specifications/ - -with updates for 32-bit and 64-bit ARM systems provided in this document. - -================================ -Convention used in this document -================================ - -This document follows the conventions described in the Devicetree -Specification, with the addition: - -- square brackets define bitfields, eg reg[7:0] value of the bitfield in - the reg property contained in bits 7 down to 0 - -===================================== -cpus and cpu node bindings definition -===================================== - -The ARM architecture, in accordance with the Devicetree Specification, -requires the cpus and cpu nodes to be present and contain the properties -described below. - -- cpus node - - Description: Container of cpu nodes - - The node name must be "cpus". - - A cpus node must define the following properties: - - - #address-cells - Usage: required - Value type: <u32> - - Definition depends on ARM architecture version and - configuration: - - # On uniprocessor ARM architectures previous to v7 - value must be 1, to enable a simple enumeration - scheme for processors that do not have a HW CPU - identification register. - # On 32-bit ARM 11 MPcore, ARM v7 or later systems - value must be 1, that corresponds to CPUID/MPIDR - registers sizes. - # On ARM v8 64-bit systems value should be set to 2, - that corresponds to the MPIDR_EL1 register size. - If MPIDR_EL1[63:32] value is equal to 0 on all CPUs - in the system, #address-cells can be set to 1, since - MPIDR_EL1[63:32] bits are not used for CPUs - identification. - - #size-cells - Usage: required - Value type: <u32> - Definition: must be set to 0 - -- cpu node - - Description: Describes a CPU in an ARM based system - - PROPERTIES - - - device_type - Usage: required - Value type: <string> - Definition: must be "cpu" - - reg - Usage and definition depend on ARM architecture version and - configuration: - - # On uniprocessor ARM architectures previous to v7 - this property is required and must be set to 0. - - # On ARM 11 MPcore based systems this property is - required and matches the CPUID[11:0] register bits. - - Bits [11:0] in the reg cell must be set to - bits [11:0] in CPU ID register. - - All other bits in the reg cell must be set to 0. - - # On 32-bit ARM v7 or later systems this property is - required and matches the CPU MPIDR[23:0] register - bits. - - Bits [23:0] in the reg cell must be set to - bits [23:0] in MPIDR. - - All other bits in the reg cell must be set to 0. - - # On ARM v8 64-bit systems this property is required - and matches the MPIDR_EL1 register affinity bits. - - * If cpus node's #address-cells property is set to 2 - - The first reg cell bits [7:0] must be set to - bits [39:32] of MPIDR_EL1. - - The second reg cell bits [23:0] must be set to - bits [23:0] of MPIDR_EL1. - - * If cpus node's #address-cells property is set to 1 - - The reg cell bits [23:0] must be set to bits [23:0] - of MPIDR_EL1. - - All other bits in the reg cells must be set to 0. - - - compatible: - Usage: required - Value type: <string> - Definition: should be one of: - "arm,arm710t" - "arm,arm720t" - "arm,arm740t" - "arm,arm7ej-s" - "arm,arm7tdmi" - "arm,arm7tdmi-s" - "arm,arm9es" - "arm,arm9ej-s" - "arm,arm920t" - "arm,arm922t" - "arm,arm925" - "arm,arm926e-s" - "arm,arm926ej-s" - "arm,arm940t" - "arm,arm946e-s" - "arm,arm966e-s" - "arm,arm968e-s" - "arm,arm9tdmi" - "arm,arm1020e" - "arm,arm1020t" - "arm,arm1022e" - "arm,arm1026ej-s" - "arm,arm1136j-s" - "arm,arm1136jf-s" - "arm,arm1156t2-s" - "arm,arm1156t2f-s" - "arm,arm1176jzf" - "arm,arm1176jz-s" - "arm,arm1176jzf-s" - "arm,arm11mpcore" - "arm,cortex-a5" - "arm,cortex-a7" - "arm,cortex-a8" - "arm,cortex-a9" - "arm,cortex-a12" - "arm,cortex-a15" - "arm,cortex-a17" - "arm,cortex-a53" - "arm,cortex-a57" - "arm,cortex-a72" - "arm,cortex-a73" - "arm,cortex-m0" - "arm,cortex-m0+" - "arm,cortex-m1" - "arm,cortex-m3" - "arm,cortex-m4" - "arm,cortex-r4" - "arm,cortex-r5" - "arm,cortex-r7" - "brcm,brahma-b15" - "brcm,brahma-b53" - "brcm,vulcan" - "cavium,thunder" - "cavium,thunder2" - "faraday,fa526" - "intel,sa110" - "intel,sa1100" - "marvell,feroceon" - "marvell,mohawk" - "marvell,pj4a" - "marvell,pj4b" - "marvell,sheeva-v5" - "nvidia,tegra132-denver" - "nvidia,tegra186-denver" - "nvidia,tegra194-carmel" - "qcom,krait" - "qcom,kryo" - "qcom,kryo385" - "qcom,scorpion" - - enable-method - Value type: <stringlist> - Usage and definition depend on ARM architecture version. - # On ARM v8 64-bit this property is required and must - be one of: - "psci" - "spin-table" - # On ARM 32-bit systems this property is optional and - can be one of: - "actions,s500-smp" - "allwinner,sun6i-a31" - "allwinner,sun8i-a23" - "allwinner,sun9i-a80-smp" - "amlogic,meson8-smp" - "amlogic,meson8b-smp" - "arm,realview-smp" - "brcm,bcm11351-cpu-method" - "brcm,bcm23550" - "brcm,bcm2836-smp" - "brcm,bcm-nsp-smp" - "brcm,brahma-b15" - "marvell,armada-375-smp" - "marvell,armada-380-smp" - "marvell,armada-390-smp" - "marvell,armada-xp-smp" - "marvell,98dx3236-smp" - "mediatek,mt6589-smp" - "mediatek,mt81xx-tz-smp" - "qcom,gcc-msm8660" - "qcom,kpss-acc-v1" - "qcom,kpss-acc-v2" - "renesas,apmu" - "renesas,r9a06g032-smp" - "rockchip,rk3036-smp" - "rockchip,rk3066-smp" - "ste,dbx500-smp" - - - cpu-release-addr - Usage: required for systems that have an "enable-method" - property value of "spin-table". - Value type: <prop-encoded-array> - Definition: - # On ARM v8 64-bit systems must be a two cell - property identifying a 64-bit zero-initialised - memory location. - - - qcom,saw - Usage: required for systems that have an "enable-method" - property value of "qcom,kpss-acc-v1" or - "qcom,kpss-acc-v2" - Value type: <phandle> - Definition: Specifies the SAW[1] node associated with this CPU. - - - qcom,acc - Usage: required for systems that have an "enable-method" - property value of "qcom,kpss-acc-v1" or - "qcom,kpss-acc-v2" - Value type: <phandle> - Definition: Specifies the ACC[2] node associated with this CPU. - - - cpu-idle-states - Usage: Optional - Value type: <prop-encoded-array> - Definition: - # List of phandles to idle state nodes supported - by this cpu [3]. - - - capacity-dmips-mhz - Usage: Optional - Value type: <u32> - Definition: - # u32 value representing CPU capacity [4] in - DMIPS/MHz, relative to highest capacity-dmips-mhz - in the system. - - - rockchip,pmu - Usage: optional for systems that have an "enable-method" - property value of "rockchip,rk3066-smp" - While optional, it is the preferred way to get access to - the cpu-core power-domains. - Value type: <phandle> - Definition: Specifies the syscon node controlling the cpu core - power domains. - - - dynamic-power-coefficient - Usage: optional - Value type: <prop-encoded-array> - Definition: A u32 value that represents the running time dynamic - power coefficient in units of uW/MHz/V^2. The - coefficient can either be calculated from power - measurements or derived by analysis. - - The dynamic power consumption of the CPU is - proportional to the square of the Voltage (V) and - the clock frequency (f). The coefficient is used to - calculate the dynamic power as below - - - Pdyn = dynamic-power-coefficient * V^2 * f - - where voltage is in V, frequency is in MHz. - -Example 1 (dual-cluster big.LITTLE system 32-bit): - - cpus { - #size-cells = <0>; - #address-cells = <1>; - - cpu@0 { - device_type = "cpu"; - compatible = "arm,cortex-a15"; - reg = <0x0>; - }; - - cpu@1 { - device_type = "cpu"; - compatible = "arm,cortex-a15"; - reg = <0x1>; - }; - - cpu@100 { - device_type = "cpu"; - compatible = "arm,cortex-a7"; - reg = <0x100>; - }; - - cpu@101 { - device_type = "cpu"; - compatible = "arm,cortex-a7"; - reg = <0x101>; - }; - }; - -Example 2 (Cortex-A8 uniprocessor 32-bit system): - - cpus { - #size-cells = <0>; - #address-cells = <1>; - - cpu@0 { - device_type = "cpu"; - compatible = "arm,cortex-a8"; - reg = <0x0>; - }; - }; - -Example 3 (ARM 926EJ-S uniprocessor 32-bit system): - - cpus { - #size-cells = <0>; - #address-cells = <1>; - - cpu@0 { - device_type = "cpu"; - compatible = "arm,arm926ej-s"; - reg = <0x0>; - }; - }; - -Example 4 (ARM Cortex-A57 64-bit system): - -cpus { - #size-cells = <0>; - #address-cells = <2>; - - cpu@0 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x0 0x0>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@1 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x0 0x1>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@100 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x0 0x100>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@101 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x0 0x101>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@10000 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x0 0x10000>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@10001 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x0 0x10001>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@10100 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x0 0x10100>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@10101 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x0 0x10101>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@100000000 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x1 0x0>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@100000001 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x1 0x1>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@100000100 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x1 0x100>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@100000101 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x1 0x101>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@100010000 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x1 0x10000>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@100010001 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x1 0x10001>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@100010100 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x1 0x10100>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; - - cpu@100010101 { - device_type = "cpu"; - compatible = "arm,cortex-a57"; - reg = <0x1 0x10101>; - enable-method = "spin-table"; - cpu-release-addr = <0 0x20000000>; - }; -}; - --- -[1] arm/msm/qcom,saw2.txt -[2] arm/msm/qcom,kpss-acc.txt -[3] ARM Linux kernel documentation - idle states bindings - Documentation/devicetree/bindings/arm/idle-states.txt -[4] ARM Linux kernel documentation - cpu capacity bindings - Documentation/devicetree/bindings/arm/cpu-capacity.txt |