120 lines
5.2 KiB
Plaintext
120 lines
5.2 KiB
Plaintext
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Qualcomm CPR (Core Power Reduction) Regulator
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CPR regulator device is for Qualcomm RBCPR (RapidBridge CPR) on
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application processor core. It takes voltage corner level
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as input and converts it to actual voltage based on the
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suggestions from factory production process. When CPR is
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enabled for application processer core, it will suggest
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scaling the voltage up or down for best performance and
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power of the core. The scaling based on factory production
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process is called PVS (Process Voltage Scaling) with efuse
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bits to indicate what bin (and voltage range) a chip is in.
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Required properties:
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- compatible: Must be "qcom,cpr-regulator"
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- reg: Register addresses for RBCPR, RBCPR clock
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select, PVS eFuse and CPR eFuse
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- reg-names: Register names. Must be "rbcpr", "rbcpr_clk",
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"pvs_efuse" and "cpr_efuse"
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- regulator-name: A string used to describe the regulator
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- interrupts: Interrupt line from RBCPR to interrupt controller.
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- regulator-min-microvolt: Minimum corner value as min constraint, which
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should be 1 for SVS corner
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- regulator-max-microvolt: Maximum corner value as max constraint, which
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should be 4 for SUPER_TURBO or 3 for TURBO
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- qcom,num-efuse-bits: The number of bits used in efuse memory to
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represent total number of PVS bins. It should
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not exceed a maximum of 5 for total number of
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32 bins.
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- qcom,pvs-bin-process: A list of integers whose length is equal to 2 to
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the power of qcom,num-efuse-bits. The location or
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0-based index of an element in the list corresponds
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to the bin number. The value of each integer
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corresponds to the PVS process speed of the APC
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silicon for a chip with one of these cases:
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1 = APC_PVS_SLOW
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2 = APC_PVS_NOM
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3 = APC_PVS_FAST
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0 or other values = No PVS
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- qcom,pvs-corner-ceiling-slow: Ceiling voltages of all corners for APC_PVS_SLOW
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- qcom,pvs-corner-ceiling-nom: Ceiling voltages of all corners for APC_PVS_NOM
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- qcom,pvs-corner-ceiling-fast: Ceiling voltages of all corners for APC_PVS_FAST
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The ceiling voltages for each of above three
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properties may look like this:
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0 (SVS voltage): 1050000 uV
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1 (NORMAL voltage): 1150000 uV
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2 (TURBO voltage): 1275000 uV
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- vdd-apc-supply: Regulator to supply VDD APC power
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- qcom,vdd-apc-step-up-limit: Limit of vdd-apc-supply steps for scaling up.
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- qcom,vdd-apc-step-down-limit: Limit of vdd-apc-supply steps for scaling down.
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- qcom,cpr-ref-clk: The reference clock in kHz.
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- qcom,cpr-timer-delay: The delay in microseconds for the timer interval.
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- qcom,cpr-timer-cons-up: Consecutive number of timer interval (qcom,cpr-timer-delay)
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occurred before issuing UP interrupt.
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- qcom,cpr-timer-cons-down: Consecutive number of timer interval (qcom,cpr-timer-delay)
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occurred before issuing DOWN interrupt.
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- qcom,cpr-irq-line: Internal interrupt route signal of RBCPR, one of 0, 1 or 2.
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- qcom,cpr-step-quotient: Number of CPR quotient (RO count) per vdd-apc-supply step
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to issue error_steps.
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- qcom,cpr-up-threshold: The threshold for CPR to issue interrupt when
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error_steps is greater than it when stepping up.
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- qcom,cpr-down-threshold: The threshold for CPR to issue interrupt when
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error_steps is greater than it when stepping down.
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- qcom,cpr-idle-clocks: Idle clock cycles RO can be in.
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- qcom,cpr-gcnt-time: The time for gate count in microseconds.
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- qcom,cpr-apc-volt-step: The voltage in microvolt per CPR step, such as 5000uV.
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Optional properties:
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- vdd-mx-supply: Regulator to supply memory power as dependency
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of VDD APC.
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- qcom,vdd-mx-vmax: The maximum voltage in uV for vdd-mx-supply. This
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is required when vdd-mx-supply is present.
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- qcom,vdd-mx-vmin-method: The method to determine the minimum voltage for
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vdd-mx-supply, which can be one of following
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choices compared with VDD APC:
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0 => equal to the voltage(vmin) of VDD APC
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1 => equal to PVS corner ceiling voltage
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2 => equal to slow speed corner ceiling
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3 => equal to qcom,vdd-mx-vmax
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This is required when vdd-mx-supply is present.
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- qcom,cpr-enable: Present: CPR enabled by default.
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Not Present: CPR disable by default.
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Example:
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apc_vreg_corner: regulator@f9018000 {
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status = "okay";
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compatible = "qcom,cpr-regulator";
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reg = <0xf9018000 0x1000>, <0xfc4b80b0 8>, <0xfc4bc450 16>;
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reg-names = "rbcpr", "pvs_efuse", "cpr_efuse";
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interrupts = <0 15 0>;
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regulator-name = "apc_corner";
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regulator-min-microvolt = <1>;
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regulator-max-microvolt = <3>;
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qcom,num-efuse-bits = <5>;
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qcom,pvs-bin-process = <0 0 0 0 0 1 1 1 1 1 2 2 2 2 2 2
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2 2 2 2 3 3 3 3 3 3 3 3 0 0 0 0>;
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qcom,pvs-corner-ceiling-slow = <1050000 1160000 1275000>;
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qcom,pvs-corner-ceiling-nom = <975000 1075000 1200000>;
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qcom,pvs-corner-ceiling-fast = <900000 1000000 1140000>;
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vdd-apc-supply = <&pm8226_s2>;
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vdd-mx-supply = <&pm8226_l3_ao>;
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qcom,vdd-mx-vmax = <1350000>;
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qcom,vdd-mx-vmin-method = <1>;
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qcom,vdd-apc-step-up-limit = <1>;
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qcom,vdd-apc-step-down-limit = <1>;
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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 = <1>;
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qcom,cpr-timer-cons-down = <2>;
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qcom,cpr-irq-line = <0>;
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qcom,cpr-step-quotient = <15>;
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qcom,cpr-up-threshold = <1>;
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qcom,cpr-down-threshold = <2>;
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qcom,cpr-idle-clocks = <5>;
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qcom,cpr-gcnt-time = <1>;
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qcom,cpr-apc-volt-step = <5000>;
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};
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