261 lines
9.2 KiB
Plaintext
261 lines
9.2 KiB
Plaintext
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Qualcomm Technologies, Inc. CPR3 Regulator - MMSS Specific Bindings
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MMSS CPR3 controllers each support one CPR thread that monitors the voltage of
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the graphics processor (MMSS) supply regulator. The CPR open-loop voltages are
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stored in hardware fuses for MMSS CPR3 controllers. However, the CPR target
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quotients must be defined in device tree.
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This document describes the MMSS specific CPR3 bindings.
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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 exacly one
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hardware thread managed by the controller. The third level describes one or
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more logical regulators handled by the 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 cpr3-hmss-regulator devices.
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====================================
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First Level Nodes - CPR3 Controllers
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====================================
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MMSS 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 "qcom,cpr3-msm8996-mmss-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: MMSS RBCPR, MMSS RBCPR
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AHB, and MMSS MMAGIC 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", "iface_clk",
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and "bus_clk" must be specified.
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=================================================
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Second Level Nodes - CPR Threads for a Controller
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=================================================
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MMSS 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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MMSS 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 MMSS.
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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 MMSS the maximum
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supported value is 8. These combos correspond to CPR
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revision fuse values from 0 to 7 in order.
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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 MMSS the maximum supported value
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is 1.
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- qcom,mem-acc-voltage
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Usage: required if mem-acc-supply is specified for the CPR3 controller
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containing this CPR3 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,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
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CPR target quotient for each ring oscillator (RO) for a
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given corner. Since CPR3 supports exactly 16 ROs, each
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tuple must contain 16 elements corresponding to RO0 through
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RO15 in order. If a given RO is unused for a corner, then
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its target quotient should be specified as 0.
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Each tuple list in the grouping must meet the same size
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requirements as those specified for qcom,mem-acc-voltage
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above. The tuples in a given list are ordered from the
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lowest corner to the highest corner.
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- qcom,cpr-ro-scaling-factor
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Usage: required if qcom,cpr-closed-loop-voltage-adjustment is
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specified
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Value type: <prop-encoded-array>
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Definition: The common definition of this property in cpr3-regulator.txt
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is accurate for MMSS CPR3 controllers except for this
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modification:
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Each tuple list must contain the number of tuples defined in
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the corresponding element of the qcom,cpr-corners property
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or the qcom,cpr-speed-bins property as opposed to the value
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of the qcom,cpr-fuse-corners property.
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- qcom,cpr-fused-closed-loop-voltage-adjustment-map
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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 CPR fused
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corner closed-loop offset adjustment fuse to utilize for
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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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Each tuple element must be either 0 or in the range 1 to
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qcom,cpr-fuse-corners. A value of 0 signifies that no fuse
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based adjustment should be applied to the fuse corner.
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Values 1 to qcom,cpr-fuse-corners denote the specific fuse
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corner that should be used by a given voltage corner.
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Note that the qcom,cpr-closed-loop-voltage-fuse-adjustment property is not
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meaningful for MMSS CPR3 regulator nodes since target quotients are not defined
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in fuses.
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=======
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Example
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=======
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gfx_cpr: cpr3-ctrl@838000 {
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compatible = "qcom,cpr3-msm8996-mmss-regulator";
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reg = <0x00838000 0x4000>, <0x00074000 0x1000>;
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reg-names = "cpr_ctrl", "fuse_base";
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clocks = <&clock_mmss clk_mmss_rbcpr_clk>,
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<&clock_mmss clk_mmss_rbcpr_ahb_clk>,
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<&clock_mmss clk_mmss_mmagic_ahb_clk>;
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clock-names = "core_clk", "iface_clk", "bus_clk";
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interrupts = <0 166 0>;
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interrupt-names = "cpr";
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qcom,cpr-ctrl-name = "gfx";
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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>;
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vdd-supply = <&pmi8994_s2>;
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qcom,voltage-step = <5000>;
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qcom,cpr-enable;
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qcom,cpr-aging-ref-voltage = <905000>;
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thread@0 {
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qcom,cpr-thread-id = <0>;
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qcom,cpr-consecutive-up = <0>;
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qcom,cpr-consecutive-down = <2>;
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qcom,cpr-up-threshold = <0>;
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qcom,cpr-down-threshold = <2>;
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gfx_vreg: regulator {
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regulator-name = "gfx_corner";
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regulator-min-microvolt = <1>;
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regulator-max-microvolt = <4>;
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qcom,cpr-fuse-corners = <4>;
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qcom,cpr-fuse-combos = <1>;
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qcom,cpr-corners = <4>;
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qcom,cpr-corner-fmax-map = <1 2 3 4>;
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qcom,cpr-voltage-ceiling =
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<670000 745000 905000 1015000>;
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qcom,cpr-voltage-floor =
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<545000 625000 755000 855000>;
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qcom,mem-acc-voltage = <1 1 2 2>;
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qcom,corner-frequencies =
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<120000000 205000000 360000000
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480000000>;
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qcom,cpr-target-quotients =
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< 0 0 0 0 249 232 0 394
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0 422 0 0 0 0 0 0>,
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< 0 0 0 0 400 363 0 565
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0 603 0 0 0 0 0 0>,
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< 0 0 0 0 669 601 0 851
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0 905 0 0 0 0 0 0>,
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< 0 0 0 0 899 806 0 1084
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0 1149 0 0 0 0 0 0>;
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qcom,cpr-ro-scaling-factor =
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< 0 0 0 0 2268 2004 0 2408
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0 2539 0 0 0 0 0 0>,
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< 0 0 0 0 2268 2004 0 2408
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0 2539 0 0 0 0 0 0>,
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< 0 0 0 0 2268 2004 0 2408
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0 2539 0 0 0 0 0 0>,
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< 0 0 0 0 2268 2004 0 2408
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0 2539 0 0 0 0 0 0>;
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qcom,cpr-open-loop-voltage-fuse-adjustment =
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<35000 0 0 0>;
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qcom,cpr-closed-loop-voltage-adjustment =
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<45000 0 0 0>;
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qcom,cpr-fused-closed-loop-voltage-adjustment-map =
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<2 2 0 4>;
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qcom,allow-voltage-interpolation;
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qcom,cpr-scaled-open-loop-voltage-as-ceiling;
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qcom,cpr-aging-max-voltage-adjustment = <25000>;
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qcom,cpr-aging-ref-corner = <3>;
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qcom,cpr-aging-ro-scaling-factor = <2950>;
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qcom,cpr-aging-derate =
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<1000 1000 1000 1000>;
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qcom,allow-aging-voltage-adjustment = <1>;
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};
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};
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};
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