259 lines
8.8 KiB
Plaintext
259 lines
8.8 KiB
Plaintext
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Qualcomm Technologies, Inc. CPR4 Regulator - APSS Specific Bindings
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APSS CPR4 controllers each support one CPR thread that monitors the voltage of
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a pair of application processor (APSS) clusters that are powered by a shared
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regulator supply. They also have a hardware channel to use these requests to
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directly change the supply voltage at the PMIC via the SPM without software
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intervention.
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APSS CPR4 controllers also have to take into account the state of the memory
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array power mux (APM) when scaling voltage to ensure that memory always receives
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a sufficiently high voltage.
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Both CPR open-loop voltages and CPR target quotients are stored in hardware
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fuses for APSS CPR4 controllers.
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This document describes the APSS specific CPR4 bindings.
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=======================
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Required Node Structure
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=======================
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CPR4 regulators must be described in three levels of devices nodes. The first
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level describes the CPR4 controller. The second level describes one or more
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hardware threads managed by the controller. The third level describes one or
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more logical regulators handled by each CPR thread.
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All platform independent cpr3-regulator binding guidelines defined in
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cpr3-regulator.txt also apply to cpr4-apss-regulator devices.
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====================================
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First Level Nodes - CPR4 Controllers
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====================================
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APSS specific properties:
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- compatible
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Usage: required
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Value type: <string>
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Definition: should be one of the following:
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"qcom,cpr4-msmtitanium-apss-regulator";
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- interrupts
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Usage: required
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Value type: <prop-encoded-array>
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Definition: CPR interrupt specifier and a hardware closed-loop ceiling
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interrupt specifier.
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- interrupt-names
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Usage: required
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Value type: <stringlist>
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Definition: Interrupt names. This list must match up 1-to-1 with the
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interrupts specified in the 'interrupts' property. "cpr"
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and "ceiling" must be specified.
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- qcom,apm-ctrl
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Usage: required on systems that need APM management
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Value type: <phandle>
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Definition: phandle of memory array power mux (APM) controller device
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node for the APM that is used by the APSS VDD supply
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- qcom,apm-threshold-voltage
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Usage: required if qcom,apm-ctrl is specified
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Value type: <u32>
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Definition: Specifies the APM threshold voltage in microvolts. If the
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vdd-supply voltage is greater than or equal to this level,
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then the APM is switched to use the vdd-supply. If the
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vdd-supply voltage is below this level, then the APM is
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switched to use the system-supply.
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- qcom,apm-hysteresis-voltage
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Usage: optional
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Value type: <u32>
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Definition: Specifies the voltage delta in microvolts between the APM
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threshold voltage and the highest corner open-loop voltage
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which may be used as the ceiling for the corner. If this
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property is not specified, then a value of 0 is assumed.
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- qcom,cpr-hw-closed-loop
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Usage: optional
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Value type: <empty>
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Definition: Boolean flag which indicates that the APSS CPR4 controller
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should operate in hardware closed-loop mode as opposed to
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software closed-loop mode.
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- vdd-limit-supply
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Usage: required
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Value type: <phandle>
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Definition: phandle of the VDD supply limit regulator which controls the
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CPR ceiling and floor voltages when operating in hardware
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closed-loop mode.
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- qcom,cpr-down-error-step-limit
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Usage: required
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Value type: <u32>
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Definition: CPR4 hardware closed-loop down error step limit which
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defines the maximum number of vdd-supply regulator steps
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that the voltage may be reduced as the result of a single
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CPR measurement.
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- qcom,cpr-up-error-step-limit
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Usage: required
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Value type: <u32>
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Definition: CPR4 hardware closed-loop up error step limit which defines
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the maximum number of vdd-supply regulator steps that the
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voltage may be increased as the result of a single
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CPR measurement.
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- qcom,cpr-saw-use-unit-mV
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Usage: optional
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Value type: <empty>
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Definition: Boolean flag which indicates that the unit used in SAW PVC
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interface is mV. Use this for vdd-supply regulators which
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do not use PMIC voltage control register LSBs per actually
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unique PMIC regulator output voltage.
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=================================================
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Second Level Nodes - CPR Threads for a Controller
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=================================================
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APSS specific properties:
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N/A
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===============================================
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Third Level Nodes - CPR Regulators for a Thread
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===============================================
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APSS specific properties:
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- qcom,cpr-fuse-corners
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Usage: required
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Value type: <u32>
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Definition: Specifies the number of fuse corners. This value must be 4
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for APSS. These fuse corners are: LowSVS, SVS, Nominal,
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and Turbo.
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- qcom,cpr-fuse-combos
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Usage: required
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Value type: <u32>
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Definition: Specifies the number of fuse combinations being supported by
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the device. This value is utilized by several other
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properties. Supported values are 1 up to the maximum
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possible for a given regulator type. For APSS the maximum
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supported value is 64. The first 8 fuse combos correspond
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to speed bin fuse value 0 along with CPR revision fuse
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values 0 to 7. The second 8 fuse combos correspond to speed
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bin fuse value 1 along with CPR revision fuse values 0 to 7.
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The last 8 fuse combos correspond to speed bin fuse value 7
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along with CPR revision fuse values 0 to 7.
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- qcom,cpr-speed-bins
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Usage: optional
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Value type: <u32>
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Definition: Specifies the number of speed bins being supported by the
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device. This value is utilized by several other properties.
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Supported values are 1 up to the maximum possible for a
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given regulator type. For APSS the maximum supported value
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is 8.
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- qcom,mem-acc-voltage
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Usage: required if mem-acc-supply is specified for the CPR4 controller
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containing this regulator
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Value type: <prop-encoded-array>
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Definition: A list of integer tuples which each define the mem-acc-supply
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corner for each voltage corner in order from lowest to highest.
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The list must contain qcom,cpr-fuse-combos number of tuples
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in which case the tuples are matched to fuse combinations
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1-to-1 or qcom,cpr-speed-bins number of tuples in which case
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the tuples are matched to speed bins 1-to-1 or exactly 1
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tuple which is used regardless of the fuse combination and
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speed bin found on a given chip.
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Each tuple must be of the length defined in the
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corresponding element of the qcom,cpr-corners property or
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the qcom,cpr-speed-bins property. A single tuple may only
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be specified if all of the corner counts in qcom,cpr-corners
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are the same.
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- qcom,allow-quotient-interpolation
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Usage: optional
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Value type: <empty>
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Definition: Boolean flag which indicates that it is acceptable to use
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interpolated CPR target quotient values. These values are
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interpolated between the target quotient Fmax fuse values.
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=======
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Example
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=======
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apc_cpr: cpr4-ctrl@b018000 {
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compatible = "qcom,cpr4-msmtitanium-apss-regulator";
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reg = <0xb018000 0x4000>, <0xa4000 0x1000>;
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reg-names = "cpr_ctrl", "fuse_base";
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interrupts = <GIC_SPI 15 IRQ_TYPE_EDGE_RISING>,
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<GIC_SPI 282 IRQ_TYPE_EDGE_RISING>;
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interrupt-names = "cpr", "ceiling";
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qcom,cpr-ctrl-name = "apc";
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qcom,cpr-sensor-time = <1000>;
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qcom,cpr-loop-time = <5000000>;
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qcom,cpr-idle-cycles = <15>;
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qcom,cpr-step-quot-init-min = <13>;
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qcom,cpr-step-quot-init-max = <13>;
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qcom,cpr-count-mode = <2>; /* Staggered */
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qcom,cpr-down-error-step-limit = <1>;
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qcom,cpr-up-error-step-limit = <1>;
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qcom,apm-ctrl = <&apc_apm>;
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qcom,apm-threshold-voltage = <848000>;
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qcom,apm-hysteresis-voltage = <5000>;
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vdd-supply = <&pmtitanium_s5>;
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qcom,voltage-step = <5000>;
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vdd-limit-supply = <&pmtitanium_s5_limit>;
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mem-acc-supply = <&apc_mem_acc_vreg>;
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qcom,cpr-enable;
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qcom,cpr-hw-closed-loop;
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thread@0 {
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qcom,cpr-thread-id = <0>;
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qcom,cpr-consecutive-up = <1>;
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qcom,cpr-consecutive-down = <1>;
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qcom,cpr-up-threshold = <1>;
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qcom,cpr-down-threshold = <1>;
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apc_vreg: regulator {
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regulator-name = "apc_corner";
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regulator-min-microvolt = <1>;
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regulator-max-microvolt = <8>;
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qcom,cpr-fuse-corners = <4>;
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qcom,cpr-fuse-combos = <8>;
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qcom,cpr-speed-bins = <1>;
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qcom,cpr-corners = <8>;
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qcom,cpr-corner-fmax-map = <1 2 4 8>;
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qcom,cpr-voltage-ceiling =
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<645000 720000 790000 865000 920000
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990000 1065000 1065000>;
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qcom,cpr-voltage-floor =
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<590000 625000 690000 755000 800000
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855000 920000 920000>;
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qcom,mem-acc-voltage = <1 1 2 2 2 2 2 2>;
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qcom,corner-frequencies =
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<652800000 1036800000 1401600000
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1689600000 1843200000 1958400000
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2150400000 2208000000>;
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qcom,allow-voltage-interpolation;
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qcom,allow-quotient-interpolation;
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qcom,cpr-scaled-open-loop-voltage-as-ceiling;
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};
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};
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};
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