Hi Rob, On 05. 10. 18 18:58, Rob Herring wrote: > Convert ARM CPU binding to DT schema format using json-schema. > > Cc: Mark Rutland <mark.rutland@xxxxxxx> > Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx> > Cc: devicetree@xxxxxxxxxxxxxxx > Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > Cc: linux-mediatek@xxxxxxxxxxxxxxxxxxx > Signed-off-by: Rob Herring <robh@xxxxxxxxxx> > --- > .../devicetree/bindings/arm/cpus.txt | 490 ----------------- > .../devicetree/bindings/arm/cpus.yaml | 503 ++++++++++++++++++ > 2 files changed, 503 insertions(+), 490 deletions(-) > delete mode 100644 Documentation/devicetree/bindings/arm/cpus.txt > create mode 100644 Documentation/devicetree/bindings/arm/cpus.yaml > > 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 > diff --git a/Documentation/devicetree/bindings/arm/cpus.yaml b/Documentation/devicetree/bindings/arm/cpus.yaml > new file mode 100644 > index 000000000000..bb75914324a3 > --- /dev/null > +++ b/Documentation/devicetree/bindings/arm/cpus.yaml > @@ -0,0 +1,503 @@ > +# SPDX-License-Identifier: None > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/bindings/arm/cpus.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: ARM CPUs bindings > + > +maintainers: > + - Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> > + > +description: |+ > + 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. > + > +properties: > + $nodename: > + const: cpus > + description: Container of cpu nodes > + > + '#address-cells': > + enum: [1, 2] > + description: | > + Definition depends on ARM architecture version and configuration: > + > + On uniprocessor ARM architectures previous to v7 > + value must be 1, to enable a simple enumeration > + scheme for processors that do not have a HW CPU > + identification register. > + On 32-bit ARM 11 MPcore, ARM v7 or later systems > + value must be 1, that corresponds to CPUID/MPIDR > + registers sizes. > + On ARM v8 64-bit systems value should be set to 2, > + that corresponds to the MPIDR_EL1 register size. > + If MPIDR_EL1[63:32] value is equal to 0 on all CPUs > + in the system, #address-cells can be set to 1, since > + MPIDR_EL1[63:32] bits are not used for CPUs > + identification. > + > + '#size-cells': > + const: 0 > + > +patternProperties: > + '^cpu@[0-9a-f]+$': > + properties: > + device_type: > + const: cpu > + > + reg: > + maxItems: 1 > + description: | > + 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: > + items: > + - enum: > + - 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: > + allOf: > + - $ref: '/schemas/types.yaml#/definitions/string' > + - oneOf: > + # On ARM v8 64-bit this property is required > + - enum: > + - psci > + - spin-table > + # On ARM 32-bit systems this property is optional > + - enum: > + - actions,s500-smp > + - allwinner,sun6i-a31 > + - allwinner,sun8i-a23 > + - allwinner,sun9i-a80-smp > + - allwinner,sun8i-a83t-smp > + - amlogic,meson8-smp > + - amlogic,meson8b-smp > + - arm,realview-smp > + - brcm,bcm11351-cpu-method > + - brcm,bcm23550 > + - brcm,bcm2836-smp > + - brcm,bcm63138 > + - 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: > + $ref: '/schemas/types.yaml#/definitions/uint64' > + > + description: > + Required for systems that have an "enable-method" > + property value of "spin-table". > + On ARM v8 64-bit systems must be a two cell > + property identifying a 64-bit zero-initialised > + memory location. > + > + qcom,saw: > + $ref: '/schemas/types.yaml#/definitions/phandle' > + description: | > + Usage: required for systems that have an "enable-method" > + property value of "qcom,kpss-acc-v1" or > + "qcom,kpss-acc-v2" > + Definition: Specifies the SAW[1] node associated with this CPU. > + > + qcom,acc: > + $ref: '/schemas/types.yaml#/definitions/phandle' > + description: | > + Usage: required for systems that have an "enable-method" > + property value of "qcom,kpss-acc-v1" or > + "qcom,kpss-acc-v2" > + Definition: Specifies the ACC[2] node associated with this CPU. > + > + cpu-idle-states: > + $ref: '/schemas/types.yaml#/definitions/phandle-array' > + description: | > + Usage: Optional > + Value type: <prop-encoded-array> > + description: List of phandles to idle state nodes supported > + by this cpu [3]. > + > + capacity-dmips-mhz: > + $ref: '/schemas/types.yaml#/definitions/uint32' > + description: > + u32 value representing CPU capacity [4] in > + DMIPS/MHz, relative to highest capacity-dmips-mhz > + in the system. > + > + rockchip,pmu: > + description: | > + 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: > + $ref: '/schemas/types.yaml#/definitions/uint32' > + description: > + 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. > + > + required: > + - device_type > + - reg > + - compatible > + > + dependencies: > + cpu-release-addr: [enable-method] > + rockchip,pmu: [enable-method] > + > +required: > + - '#address-cells' > + - '#size-cells' > + > +examples: > + - | > + 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>; > + }; > + }; > +... > I have take a look at xilinx part of this and try to build it for arm64 platforms and I see errors coming from this cpu description. /root/linux/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dt.yaml: cpu@0:compatible: ['arm,cortex-a53', 'arm,armv8'] is too long /root/linux/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dt.yaml: cpu@0:compatible: Additional items are not allowed ('arm,armv8' was unexpected) Based on grep this is used in a lot of places compatible = "arm,cortex-a53", "arm,armv8"; Should this be moved to just simple? compatible = "arm,cortex-a53"; Thanks, Michal
