396 lines
14 KiB
Plaintext
396 lines
14 KiB
Plaintext
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Qualcomm Technologies, Inc. CPR regulator for Graphics
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GFX CPR controller monitors the voltage of the graphics processor(GPU)
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power rail. The CPR open-loop voltages are stored in hardware fuses
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for GFX CPR controller. However, the CPR target quotients must be defined
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in device tree. This driver supports CPR version 2 controller.
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This document describes the bindings that apply for GFX CPR controller.
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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 "qcom,cpr2-gfx-regulator"
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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 CPR
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controller 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 "rbcpr" and "efuse_addr". 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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- regulator-name
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Usage: required
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Value type: <string>
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Definition: A string used to describe the regulator.
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- clocks
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Usage: required
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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
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following clocks must be specified: GFX RBCPR, GFX RBCPR
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AHB.
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- clock-names
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Usage: required
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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" and "iface_clk"
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must be specified.
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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.
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- vdd-gfx-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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- qcom,cpr-corners
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Usage: required
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Value type: <u32>
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Definition: Number of voltage corners present. Many other
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properties are sized based upon this value.
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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-voltage-ceiling
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Usage: required
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Value type: <prop-encoded-array>
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Definition: Array of ceiling voltages in microvolts for voltage corners
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ordered from lowest voltage corner to highest voltage corner.
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This property must be of length defined by qcom,cpr-corners.
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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: Array of floor voltages in microvolts for voltage corners
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ordered from lowest voltage corner to highest voltage corner.
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This property must be of length defined by qcom,cpr-corners.
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- qcom,vdd-gfx-step-up-limit
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Usage: required
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Value type: <u32>
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Definition: Limit of vdd-gfx-supply steps for scaling up.
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- qcom,vdd-gfx-step-down-limit
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Usage: required
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Value type: <u32>
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Definition: Limit of vdd-gfx-supply steps for scaling down.
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- qcom,cpr-ref-clk
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Usage: required
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Value type: <u32>
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Definition: The reference clock rate in kHz.
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- qcom,cpr-timer-delay
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Usage: required
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Value type: <u32>
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Definition: The delay in microseconds for the timer interval.
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- qcom,cpr-timer-cons-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 a up interrupt. Supported values: 0 - 15.
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- qcom,cpr-timer-cons-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-irq-line
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Usage: required
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Value type: <u32>
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Definition: Internal interrupt route signal of RBCPR, one of 0, 1 or 2.
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- qcom,cpr-step-quotient
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Usage: required
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Value type: <u32>
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Definition: Defines the number of CPR quotient (i.e. Ring Oscillator(RO)
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count) per vdd-gfx-supply output voltage step. A single
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integer value to be used for all RO's.
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- qcom,cpr-gfx-volt-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-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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- qcom,cpr-idle-clocks
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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. Supported values: 0 - 31.
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- qcom,cpr-gcnt-time
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Usage: required
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Value type: <u32>
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Definition: The time for gate count in microseconds.
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- qcom,cpr-fuse-init-voltage
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Usage: required
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Value type: <prop-encoded-array>
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Definition: Array of quadruples in which each quadruple specifies a fuse
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location to read in order to get an initial voltage for a
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voltage corner. The fuse values are encoded as voltage steps
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higher or lower than the voltages defined in
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qcom,cpr-init-voltage-ref. Each step corresponds to the
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voltage defined by the qcom,cpr-init-voltage-step property.
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The 3 elements in one quadruple are:
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[0] => fuse row number
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[1] => bit offset within the row
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[2] => number of bits in the fuse parameter
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The quadruples are ordered from the lowest voltage corner to
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the highest voltage corner. The number for quadruples must be
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equal to the value specified in qcom,cpr-corners property.
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- qcom,cpr-init-voltage-ref
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Usage: required
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Value type: <prop-encoded-array>
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Definition: Array of reference voltages in microvolts used when decoding
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the initial voltage fuse values. The elements in the array
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are ordered from lowest voltage corner to highest voltage
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corner. This property must be of length defined by
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qcom,cpr-corners.
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- qcom,cpr-init-voltage-step
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Usage: required if qcom,cpr-fuse-init-voltage is specified.
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Value type: <u32>
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Definition: The voltage step size in microvolts of the CPR initial
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voltage fuses described by the qcom,cpr-fuse-init-voltage
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property.
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- qcom,cpr-ro-count
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Usage: required
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Value type: <u32>
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Definition: Defines the number of Ring Oscillator(RO)s present.
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- qcom,cpr-target-quotients
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Usage: required
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Value type: <prop-encoded-array>
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Definition: A grouping of integer tuple lists. Each tuple defines the CPR
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target quotient for each ring oscillator (RO) for a given corner.
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Each tuple must be of the length defined by qcom,cpr-ro-count.
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If a given RO is unused for a corner, then its target quotient
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should be specified as 0. Each tuple list must contain the
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number of tuples defined by the qcom,cpr-corners property.
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The tuples in a given list are ordered from the lowest corner
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to the highest corner. The tuple list grouping must contain
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exactly 1 list if qcom,cpr-fuse-version-map is not specified or
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the number of tuple lists must be equal to the number of tuples
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in qcom,cpr-fuse-version-map.
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- vdd-mx-supply
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Usage: optional
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Value type: <phandle>
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Definition: Regulator to supply memory power as dependency of VDD_GFX.
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- qcom,vdd-mx-corner-map
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Usage: required if vdd-mx-supply is specified.
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Value type: <prop-encoded-array>
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Definition: Array of integers which define the mapping of the VDD_MX corner
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to the corresponding GFX voltage corner. The elements in
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the array are ordered from lowest voltage corner to highest
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voltage corner. The length of this property must be equal to
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the value defined by qcom,cpr-corners.
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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: Regulator to vote for the memory accelerator configuration.
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Not Present: memory accelerator configuration not supported.
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- qcom,cpr-fuse-revision
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Usage: optional
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Value type: <prop-encoded-array>
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Definition: Array of 3 integer elements which define the location of the
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bits for the CPR fusing revision fuse parameter.
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The 3 elements are:
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[0] => fuse row number
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[1] => bit offset within the row
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[2] => number of bits in the fuse parameter
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The fusing revision value is used to determine specific
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adjustments that maybe required on some chips.
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- qcom,process-id-fuse
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Usage: optional
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Value type: <prop-encoded-array>
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Definition: Array of 3 integer elements which define the location of the
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bits for the process node id fuse parameter.
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The 3 elements are:
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[0] => fuse row number
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[1] => bit offset within the row
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[2] => number of bits in the fuse parameter
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This value is used to determine the specific adjustments that
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may be required on some chips.
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- qcom,foundry-id-fuse
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Usage: optional
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Value type: <prop-encoded-array>
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Definition: Array of 3 integer elements which define the location of the
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bits for the foundry identification fuse parameter.
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The 3 elements are:
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[0] => fuse row number
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[1] => bit offset within the row
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[2] => number of bits in the fuse parameter
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This value is used to determine the specific adjustments that
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may be required on some chips.
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- qcom,cpr-fuse-version-map
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Usage: optional
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Value type: <prop-encoded-array>
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Definition: Array of integer tuples which each match to a given
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combination of CPR fuse parameter values. Each tuple
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consists of 3 elements. The elements in one tuple are:
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[0] => the foundry identification
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[1] => the CPR fuse revision
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[2] => the process node id
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Any element in a tuple may use the value 0xffffffff as a
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wild card which will match against any fuse parameter value.
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The first tuple that matches against the fuse values read
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from hardware will be used. This property is used by several
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properties to provide an index into their lists.
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- qcom,cpr-init-voltage-adjustment
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Usage: optional
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Value type: <prop-encoded-array>
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Definition: Array of integer tuples of initial voltage adjustments in
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microvolts to add to the fused initial voltage values of
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each fuse corner. The elements in a tuple are ordered from
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lowest voltage corner to highest voltage corner. Each tuple
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must be of the length defined by qcom,cpr-corners.
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If the qcom,cpr-fuse-version-map property is specified, then
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qcom,cpr-init-voltage-adjustment must contain the same
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number of tuples as qcom,cpr-fuse-version-map. These tuples
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are then mapped one-to-one in the order specified. E.g. if
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the second qcom,cpr-fuse-version-map tuple matches for a
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given device, then the initial voltage adjustments defined
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in the second qcom,cpr-init-voltage-adjustment tuple will be
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applied. If the qcom,cpr-fuse-version-map property is not
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specified, then qcom,cpr-init-voltage-adjustment must contain
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a single tuple which is then applied unconditionally. This
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property can be used to add or subtract static initial voltage
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margin from the regulator managed by the CPR controller.
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- qcom,cpr-init-voltage-as-ceiling
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Usage: optional
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Value type: <empty>
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Definition: Boolean which indicates that the ceiling voltage used for
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a given virtual corner may be reduced to the initial voltage
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value.
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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 CPR 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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=======
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Example
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=======
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gfx_vreg_corner: regulator@98000 {
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compatible = "qcom,cpr2-gfx-regulator";
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reg = <0x98000 0x1000>, <0xa4000 0x1000>;
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reg-names = "rbcpr", "efuse_addr";
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clocks = <&clock_gcc clk_gcc_rbcpr_gfx_clk>,
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<&clock_gcc clk_gcc_rbcpr_gfx_ahb_clk>;
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clock-names = "core_clk", "iface_clk";
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interrupts = <0 150 0>;
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regulator-name = "gfx_corner";
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qcom,cpr-corners = <8>;
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regulator-min-microvolt = <1>;
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regulator-max-microvolt = <8>;
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qcom,cpr-voltage-ceiling = <810000 865000 900000 950000 1010000 1050000 1110000 1165000>;
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qcom,cpr-voltage-floor = <755000 755000 755000 795000 835000 855000 920000 945000>;
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vdd-gfx-supply = <&pm8004_s5>;
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vdd-mx-supply = <&pm8950_s6_level_ao>;
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qcom,vdd-mx-vmax = <RPM_SMD_REGULATOR_LEVEL_TURBO>;
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qcom,vdd-mx-corner-map = <RPM_SMD_REGULATOR_LEVEL_SVS>,
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<RPM_SMD_REGULATOR_LEVEL_SVS>,
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<RPM_SMD_REGULATOR_LEVEL_SVS>,
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<RPM_SMD_REGULATOR_LEVEL_SVS>,
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<RPM_SMD_REGULATOR_LEVEL_SVS_PLUS>,
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<RPM_SMD_REGULATOR_LEVEL_NOM>,
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<RPM_SMD_REGULATOR_LEVEL_NOM_PLUS>,
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<RPM_SMD_REGULATOR_LEVEL_TURBO>;
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mem-acc-supply = <&mem_acc_gfx_vreg_corner>;
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qcom,cpr-ref-clk = <19200>;
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qcom,cpr-timer-delay = <5000>;
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qcom,cpr-timer-cons-up = <0>;
|
||
|
|
qcom,cpr-timer-cons-down = <2>;
|
||
|
|
qcom,cpr-irq-line = <0>;
|
||
|
|
qcom,cpr-step-quotient = <16>;
|
||
|
|
qcom,cpr-up-threshold = <2>;
|
||
|
|
qcom,cpr-down-threshold = <4>;
|
||
|
|
qcom,cpr-idle-clocks = <15>;
|
||
|
|
qcom,cpr-gcnt-time = <1>;
|
||
|
|
qcom,vdd-gfx-step-up-limit = <1>;
|
||
|
|
qcom,vdd-gfx-step-down-limit = <1>;
|
||
|
|
qcom,cpr-gfx-volt-step = <5000>;
|
||
|
|
|
||
|
|
qcom,cpr-init-voltage-ref = <865000 865000 950000 950000 950000 1050000 1050000 1165000>;
|
||
|
|
qcom,cpr-fuse-init-voltage =
|
||
|
|
<72 50 5>,
|
||
|
|
<72 50 5>,
|
||
|
|
<72 45 5>,
|
||
|
|
<72 45 5>,
|
||
|
|
<72 45 5>,
|
||
|
|
<72 40 5>,
|
||
|
|
<72 40 5>,
|
||
|
|
<72 35 5>;
|
||
|
|
qcom,cpr-init-voltage-step = <12500>;
|
||
|
|
qcom,cpr-ro-count = <8>;
|
||
|
|
qcom,cpr-init-voltage-as-ceiling;
|
||
|
|
qcom,cpr-init-voltage-adjustment =
|
||
|
|
<(-55000) 0 (-60000) 0 (60000) 0 (65000) 0>;
|
||
|
|
qcom,cpr-target-quotients =
|
||
|
|
<513 489 620 574 237 272 144 177>,
|
||
|
|
<562 536 675 627 264 303 163 199>,
|
||
|
|
<631 606 744 699 315 356 205 245>,
|
||
|
|
<780 752 902 854 412 459 283 330>,
|
||
|
|
<879 847 1001 949 490 535 351 400>,
|
||
|
|
<1010 971 1138 1080 579 626 428 479>,
|
||
|
|
<1086 1039 1210 1146 643 684 489 538>,
|
||
|
|
<1238 1179 1367 1290 752 789 586 633>;
|
||
|
|
};
|