576 lines
22 KiB
Plaintext
576 lines
22 KiB
Plaintext
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Qualcomm Technologies, Inc. CPR3 Regulator - Platform Independent Bindings
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Core Power Reduction (CPR) version 3 controllers are used by some Qualcomm
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Technologies, Inc. (QTI) SoCs to manage important voltage regulators. CPR3
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controllers are capable of monitoring several ring oscillator sensing loops
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simultaneously. The CPR3 controller informs software when the silicon
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conditions require the supply voltage to be increased or decreased. On certain
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supply rails, the CPR3 controller is able to propagate the voltage increase
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or decrease requests all the way to the PMIC without software involvement.
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This document describes the common platform independent bindings that apply
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to all CPR3 controllers.
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=======================
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Required Node Structure
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=======================
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CPR3 regulators must be described in three levels of devices nodes. The first
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level describes the CPR3 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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====================================
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First Level Nodes - CPR3 Controllers
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====================================
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Platform independent properties:
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- compatible
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Usage: required
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Value type: <string>
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Definition: The value to use for this property is defined in the
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platform specific cpr3-regulator binding documentation
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files.
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- reg
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Usage: required
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Value type: <prop-encoded-array>
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Definition: Addresses and sizes for the memory of the CPR3 controller
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and the first fuse row
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- reg-names
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Usage: required
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Value type: <stringlist>
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Definition: Address names. Must be "cpr_ctrl" and "fuse_base". Must be
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specified in the same order as the corresponding addresses
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are specified in the reg property.
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- qcom,cpr-ctrl-name
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Usage: required
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Value type: <string>
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Definition: Name for this CPR controller
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- vdd-supply
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Usage: required
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Value type: <phandle>
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Definition: phandle of the underlying regulator device that is managed
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by this CPR controller.
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- system-supply
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Usage: optional
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Value type: <phandle>
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Definition: phandle of the system-level regulator device which the
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vdd-supply depends upon. Requests for this regulator must
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be made before increasing the vdd-supply voltage and after
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decreasing the vdd-supply voltage.
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- mem-acc-supply
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Usage: optional
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Value type: <phandle>
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Definition: phandle of the mem-acc regulator device which is used to
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configure memory array circuitry settings based upon
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the performance operating point. Requests for this regulator
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must be made before decreasing the vdd-supply voltage and
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after increasing the vdd-supply voltage.
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- clocks
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Usage: optional
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Value type: <prop-encoded-array>
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Definition: Array of clock tuples in which each tuple consists of a
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phandle to a clock device and a clock ID number. The CPR3
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core clock must be specified for some targets. See platform
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specific cpr3-regulator binding documentation for additional
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clocks that may also need to be specified.
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- clock-names
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Usage: optional
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Value type: <stringlist>
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Definition: Clock names. This list must match up 1-to-1 with the clocks
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specified in the 'clocks' property. "core_clk" must be
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specified for some platforms. Other clocks may be required
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for some platforms.
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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 optionally a hardware
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closed-loop ceiling 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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must be specified. "ceiling" may be specified for some
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platforms.
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- qcom,cpr-sensor-time
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Usage: required
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Value type: <u32>
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Definition: The time in nanoseconds that each CPR sensor within the
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sensing loop takes to perform a measurement.
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- qcom,cpr-loop-time
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Usage: required
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Value type: <u32>
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Definition: The time in nanoseconds between consecutive CPR
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measurements.
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- qcom,cpr-idle-cycles
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Usage: required
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Value type: <u32>
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Definition: The number of CPR core clock cycles for the CPR controller
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to wait in transitional states.
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Supported values: 0 - 31.
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- qcom,voltage-step
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Usage: required
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Value type: <u32>
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Definition: The voltage in microvolts of a single step of the VDD supply
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regulator being controlled by CPR.
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- qcom,cpr-step-quot-init-min
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Usage: required
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Value type: <u32>
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Definition: The default minimum CPR step quotient value. The step
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quotient is the number of additional ring oscillator ticks
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observed for each qcom,voltage-step increase in vdd-supply
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output voltage. Supported values: 0 - 63.
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- qcom,cpr-step-quot-init-max
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Usage: required
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Value type: <u32>
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Definition: The default maximum CPR step quotient value.
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Supported values: 0 - 63.
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- qcom,cpr-count-mode
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Usage: required
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Value type: <u32>
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Definition: The CPR counting mode to use during CPR measurements.
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Supported values:
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0 - Read all sensors at once and use the minimum
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quotient value observed in repeated measurements.
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1 - Read all sensors at once and use the maximum
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quotient value observed in repeated measurements.
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2 - Read each sensor once in a sequential, staggered
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fashion.
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- qcom,cpr-count-repeat
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Usage: optional
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Value type: <u32>
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Definition: The number of times to read CPR sensors during a single CPR
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measurement when using one of the all-at-once count modes.
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- qcom,cpr-enable
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Usage: optional
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Value type: <empty>
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Definition: Boolean flag which indicates that the CPR3 controller
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should operate in closed-loop mode (i.e. CPR sensing loop
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enabled) as opposed to open-loop mode (i.e. CPR sensing loop
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disabled) by default.
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- qcom,cpr-aging-ref-voltage
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Usage: required if qcom,allow-aging-voltage-adjustment is specified
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for any third level nodes
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Value type: <u32>
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Definition: Specifies the CPR aging reference voltage in microvolts.
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This is the voltage that vdd-supply must be set to when
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performing an aging measurement.
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=================================================
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Second Level Nodes - CPR Threads for a Controller
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=================================================
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Platform independent properties:
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- qcom,cpr-thread-id
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Usage: required
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Value type: <u32>
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Definition: Specifies the hardware thread ID of this thread within the
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CPR controller.
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- qcom,cpr-consecutive-up
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Usage: required
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Value type: <u32>
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Definition: The number of consecutive CPR step up events needed to
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to trigger an up interrupt. Supported values: 0 - 15.
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- qcom,cpr-consecutive-down
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Usage: required
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Value type: <u32>
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Definition: The number of consecutive CPR step down events needed to
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to trigger a down interrupt. Supported values: 0 - 15.
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- qcom,cpr-up-threshold
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Usage: required
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Value type: <u32>
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Definition: The number CPR error steps required to generate an up event.
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Supported values: 0 - 31.
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- qcom,cpr-down-threshold
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Usage: required
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Value type: <u32>
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Definition: The number CPR error steps required to generate a down
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event. Supported values: 0 - 31.
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===============================================
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Third Level Nodes - CPR Regulators for a Thread
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===============================================
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Platform independent properties:
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- regulator-name
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Usage: required
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Value type: <string>
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Definition: Specifies the name for this CPR3 regulator.
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- regulator-min-microvolt
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Usage: required
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Value type: <u32>
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Definition: Minimum corner value which should be 1 to represent the
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lowest supported corner.
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- regulator-max-microvolt
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Usage: required
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Value type: <u32>
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Definition: Maximum corner value which should be equal to largest value
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listed in qcom,cpr-corners.
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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. See platform specific
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binding files for further requirements.
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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. See platform specific
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binding files for further details.
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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. See platform specific binding files
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for further details.
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This property can only be utilized if the number of corners
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for all fuse combinations associated with a given speed bin
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is the same.
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- qcom,cpr-corners
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Usage: required
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Value type: <prop-encoded-array>
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Definition: A list of integers which defines how many voltage corners
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are to be used for each fuse combination. The list must
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contain either qcom,cpr-fuse-combos number of elements in
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which case the corner counts are applied to fuse
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combinations 1-to-1 or the list must contain exactly 1
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element which is used regardless of the fuse combination
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found on a given chip.
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- qcom,cpr-speed-bin-corners
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Usage: required if qcom,cpr-speed-bins is specified
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Value type: <prop-encoded-array>
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Definition: A list of integers which defines how many voltage corners
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are to be used for each speed bin. The list must contain
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qcom,cpr-speed-bins number of elements.
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- qcom,cpr-corner-fmax-map
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Usage: required
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Value type: <prop-encoded-array>
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Definition: A list of integer tuples which each define the highest
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(i.e. maximum frequency) 1-based corner value associated
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with each fuse-corner.
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Each tuple must have a number of elements equal to the value
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of the qcom,cpr-fuse-corners property. The elements of a
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tuple are ordered from lowest to highest fuse corner.
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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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- qcom,cpr-voltage-ceiling
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Usage: required
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Value type: <prop-encoded-array>
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Definition: A list of integer tuples which each define the CPR ceiling
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voltage in microvolts for each voltage corner in order from
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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,cpr-voltage-floor
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Usage: required
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Value type: <prop-encoded-array>
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Definition: A list of integer tuples which each define the CPR floor
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voltage in microvolts for each voltage corner in order from
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lowest to highest.
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The list and tuples must meet the same size requirements as
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those specified for qcom,cpr-voltage-ceiling above.
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- qcom,cpr-floor-to-ceiling-max-range
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Usage: optional
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Value type: <prop-encoded-array>
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Definition: A list of integer tuples which each define the maximum
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allowed difference between the final floor voltage and the
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final ceiling voltage in microvolts for each voltage corner
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in order from lowest to highest. A negative value may be
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specified for an element to indicate that there is no
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limitation of the floor to ceiling voltage range for the
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corresponding corner.
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In the case that the initial floor to ceiling voltage is
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greater than the max range specified, the floor voltage will
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be increased in order to satisfy the max range constraint.
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The list and tuples must meet the same size requirements as
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those specified for qcom,cpr-voltage-ceiling above.
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- qcom,system-voltage
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Usage: optional
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Value type: <prop-encoded-array>
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Definition: A list of integer tuples which each define the system-supply
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voltage in microvolts or corners or levels for each voltage
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corner in order from lowest to highest.
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The list and tuples must meet the same size requirements as
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those specified for qcom,cpr-voltage-ceiling above.
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- qcom,corner-frequencies
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Usage: required
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Value type: <prop-encoded-array>
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Definition: A list of integer tuples which each define the CPU frequency
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in Hertz corresponding to each voltage corner in order from
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lowest to highest.
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The list and tuples must meet the same size requirements as
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those specified for qcom,cpr-voltage-ceiling above.
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- qcom,allow-voltage-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 open-loop voltage values. These values are
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interpolated between the open-loop voltage Fmax fuse values.
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- qcom,cpr-scaled-open-loop-voltage-as-ceiling
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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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the interpolated open-loop voltage for each corner as the
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|
|
CPR ceiling voltage for each corner.
|
||
|
|
|
||
|
|
- qcom,cpr-open-loop-voltage-fuse-adjustment
|
||
|
|
Usage: optional
|
||
|
|
Value type: <prop-encoded-array>
|
||
|
|
Definition: A list of integer tuples which each define the open-loop
|
||
|
|
voltage adjustment in microvolts for each fused voltage
|
||
|
|
corner in order from lowest to highest. This adjustment is
|
||
|
|
applied to the values read from fuses before the values are
|
||
|
|
used in interpolation for intermediate corners.
|
||
|
|
|
||
|
|
The list and tuples must meet the same size requirements as
|
||
|
|
those specified for qcom,cpr-corner-fmax-map above.
|
||
|
|
|
||
|
|
The open-loop voltage for a given fuse corner corresponds to
|
||
|
|
the voltage that is safe to use under all circumstances.
|
||
|
|
It is used as a starting voltage for CPR and may also be
|
||
|
|
specified as a ceiling voltage for CPR scaling.
|
||
|
|
|
||
|
|
- qcom,cpr-open-loop-voltage-adjustment
|
||
|
|
Usage: optional
|
||
|
|
Value type: <prop-encoded-array>
|
||
|
|
Definition: A list of integer tuples which each define the open-loop
|
||
|
|
voltage adjustment in microvolts for each voltage corner in
|
||
|
|
order from lowest to highest. This adjustment is applied to
|
||
|
|
the open-loop voltage values after they have been
|
||
|
|
interpolated for intermediate corners.
|
||
|
|
|
||
|
|
The list and tuples must meet the same size requirements as
|
||
|
|
those specified for qcom,cpr-voltage-ceiling above.
|
||
|
|
|
||
|
|
- qcom,cpr-open-loop-voltage-min-diff
|
||
|
|
Usage: optional; only meaningful if the
|
||
|
|
qcom,cpr-open-loop-voltage-adjustment property is specified
|
||
|
|
Value type: <prop-encoded-array>
|
||
|
|
Definition: A list of integer tuples which each define the minimum
|
||
|
|
allowed open-loop voltage difference in microvolts between
|
||
|
|
each voltage corner and the one immediately preceding it.
|
||
|
|
The elements in a tuple are ordered from the lowest to the
|
||
|
|
highest corner. The value specified for the first corner is
|
||
|
|
ignored since there is no corner before it.
|
||
|
|
|
||
|
|
Negative voltage values may be specified for this property.
|
||
|
|
A negative value means that the open-loop voltage of a
|
||
|
|
corner may be lower than that of the preceding corner.
|
||
|
|
|
||
|
|
The minimum difference is enforced after the open-loop
|
||
|
|
voltage values have been interpolated for intermediate
|
||
|
|
corners and after adjustments have been applied.
|
||
|
|
|
||
|
|
The list and tuples must meet the same size requirements as
|
||
|
|
those specified for qcom,cpr-voltage-ceiling above.
|
||
|
|
|
||
|
|
If this property is not specified, then the minimum
|
||
|
|
difference is assumed to be 0 uV for all corners.
|
||
|
|
|
||
|
|
- qcom,cpr-closed-loop-voltage-fuse-adjustment
|
||
|
|
Usage: optional
|
||
|
|
Value type: <prop-encoded-array>
|
||
|
|
Definition: A list of integer tuples which each define the closed-loop
|
||
|
|
voltage adjustment in microvolts for each fused voltage
|
||
|
|
corner in order from lowest to highest. This adjustment is
|
||
|
|
applied to the values read from fuses before the values are
|
||
|
|
used in interpolation for intermediate corners.
|
||
|
|
|
||
|
|
The list and tuples must meet the same size requirements as
|
||
|
|
those specified for qcom,cpr-corner-fmax-map above.
|
||
|
|
|
||
|
|
The qcom,cpr-ro-scaling-factor property must be specified in
|
||
|
|
order to utilize this property.
|
||
|
|
|
||
|
|
The closed-loop voltage for a given fuse corner corresponds
|
||
|
|
to the voltage that the CPR controller settles the VDD
|
||
|
|
supply rail to based upon the programmed CPR target
|
||
|
|
quotients and the current silicon conditions.
|
||
|
|
|
||
|
|
- qcom,cpr-closed-loop-voltage-adjustment
|
||
|
|
Usage: optional
|
||
|
|
Value type: <prop-encoded-array>
|
||
|
|
Definition: A list of integer tuples which each define the closed-loop
|
||
|
|
voltage adjustment in microvolts for each voltage corner in
|
||
|
|
order from lowest to highest. This adjustment is applied to
|
||
|
|
target quotient values after they have been interpolated
|
||
|
|
for intermediate corners.
|
||
|
|
|
||
|
|
The list and tuples must meet the same size requirements as
|
||
|
|
those specified for qcom,cpr-voltage-ceiling above.
|
||
|
|
|
||
|
|
The qcom,cpr-ro-scaling-factor property must be specified in
|
||
|
|
order to utilize this property.
|
||
|
|
|
||
|
|
- qcom,cpr-ro-scaling-factor
|
||
|
|
Usage: required if qcom,cpr-closed-loop-voltage-fuse-adjustment,
|
||
|
|
qcom,cpr-closed-loop-voltage-adjustment, or
|
||
|
|
qcom,allow-aging-voltage-adjustment is specified
|
||
|
|
Value type: <prop-encoded-array>
|
||
|
|
Definition: A grouping of integer tuple lists. Each tuple defines the
|
||
|
|
CPR ring oscillator (RO) scaling factor with units of QUOT/V
|
||
|
|
for each RO for a given fuse corner. Since CPR3 supports
|
||
|
|
exactly 16 ROs, each tuple must contain 16 elements
|
||
|
|
corresponding to RO0 through RO15 in order. If a given RO
|
||
|
|
is unused for a fuse corner, then its scaling factor may be
|
||
|
|
specified as 0.
|
||
|
|
|
||
|
|
Each tuple list must contain the number of tuples defined in
|
||
|
|
the qcom,cpr-fuse-corners property. The tuples in a given
|
||
|
|
list are ordered from the lowest fuse corner to the highest
|
||
|
|
fuse corner.
|
||
|
|
|
||
|
|
The tuple list grouping must contain qcom,cpr-fuse-combos
|
||
|
|
number of tuple lists in which case the lists are matched to
|
||
|
|
fuse combinations 1-to-1 or qcom,cpr-speed-bins number of
|
||
|
|
tuple lists in which case the lists are matched to
|
||
|
|
speed bins 1-to-1 or exactly 1 list which is used regardless
|
||
|
|
of the fuse combination and speed bin found on a given chip.
|
||
|
|
|
||
|
|
The target quotient adjustment to apply for each RO of a
|
||
|
|
given corner is determined by multiplying the adjustment
|
||
|
|
value in qcom,cpr-closed-loop-voltage-fuse-adjustment or
|
||
|
|
qcom,cpr-closed-loop-voltage-adjustment by the relevant RO
|
||
|
|
scaling factor in this property.
|
||
|
|
|
||
|
|
- qcom,allow-aging-voltage-adjustment
|
||
|
|
Usage: optional
|
||
|
|
Value type: <prop-encoded-array>
|
||
|
|
Definition: A list of integers which specifies if CPR aging adjustment
|
||
|
|
should be performed for each fuse combination.
|
||
|
|
Supported per-combo element values:
|
||
|
|
0 - do not perform CPR aging adjustment
|
||
|
|
1 - perform CPR aging adjustment
|
||
|
|
|
||
|
|
The list must contain qcom,cpr-fuse-combos number of
|
||
|
|
elements in which case the elements are matched to fuse
|
||
|
|
combinations 1-to-1 or qcom,cpr-speed-bins number of
|
||
|
|
elements in which case the elements are matched to
|
||
|
|
speed bins 1-to-1 or exactly 1 element which is used
|
||
|
|
regardless of the fuse combination and speed bin found
|
||
|
|
on a given chip.
|
||
|
|
|
||
|
|
- qcom,cpr-aging-max-voltage-adjustment
|
||
|
|
Usage: required if qcom,allow-aging-voltage-adjustment is specified
|
||
|
|
Value type: <prop-encoded-array>
|
||
|
|
Definition: A list of integers which defines the maximum CPR aging
|
||
|
|
voltage margin adjustment in microvolts that may be added
|
||
|
|
for each fuse combination. If this property is specified
|
||
|
|
and the adjustment specified is greater than 0, then aging
|
||
|
|
adjustments are required for this regulator.
|
||
|
|
|
||
|
|
The list must meet the same size requirements as those
|
||
|
|
specified for qcom,allow-aging-voltage-adjustment above.
|
||
|
|
|
||
|
|
- qcom,cpr-aging-ref-corner
|
||
|
|
Usage: required if qcom,allow-aging-voltage-adjustment is specified
|
||
|
|
Value type: <prop-encoded-array>
|
||
|
|
Definition: A list of integers which defines the CPR reference corner
|
||
|
|
for this regulator to use during aging measurements for each
|
||
|
|
fuse combination.
|
||
|
|
|
||
|
|
The list must meet the same size requirements as those
|
||
|
|
specified for qcom,allow-aging-voltage-adjustment above.
|
||
|
|
|
||
|
|
- qcom,cpr-aging-ro-scaling-factor
|
||
|
|
Usage: required if qcom,allow-aging-voltage-adjustment is specified
|
||
|
|
Value type: <prop-encoded-array>
|
||
|
|
Definition: A list of integers which defines the CPR aging ring
|
||
|
|
oscillator (RO) scaling factor with units of QUOT/V to use
|
||
|
|
during aging measurements for each fuse combination.
|
||
|
|
|
||
|
|
The list must meet the same size requirements as those
|
||
|
|
specified for qcom,allow-aging-voltage-adjustment above.
|
||
|
|
|
||
|
|
- qcom,cpr-aging-derate
|
||
|
|
Usage: optional, though only meaningful if
|
||
|
|
qcom,allow-aging-voltage-adjustment is specified
|
||
|
|
Value type: <prop-encoded-array>
|
||
|
|
Definition: A list of integer tuples which each define the CPR aging
|
||
|
|
derating scaling factor to apply to the closed-loop voltage
|
||
|
|
margin adjustment for each corner. The individual scaling
|
||
|
|
factors have units of uV/mV and are ordered from lowest to
|
||
|
|
highest corner per tuple. For example, a value of 900
|
||
|
|
specifies that the voltage adjustment for the corner should
|
||
|
|
be 90% (900/1000) of that for the reference corner.
|
||
|
|
|
||
|
|
The list and tuples must meet the same size requirements as
|
||
|
|
those specified for qcom,cpr-voltage-ceiling above.
|
||
|
|
|
||
|
|
If this property is not specified, then it is assumed that
|
||
|
|
no corners require derating (i.e. the scaling factor would
|
||
|
|
be 1000).
|
||
|
|
|
||
|
|
All properties specified within the core regulator framework can also be used in
|
||
|
|
third level nodes. These bindings can be found in:
|
||
|
|
Documentation/devicetree/bindings/regulator/regulator.txt.
|
||
|
|
|
||
|
|
See platform specific cpr3-regulator binding documentation files for examples.
|