85 lines
2.8 KiB
Plaintext
85 lines
2.8 KiB
Plaintext
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MSM SPDM bandwidth monitor device
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devfreq-spdm is a device that represents a device that is monitored by the SPDM
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hardware to measure the traffic status of configured master ports on the bus.
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Required properties:
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-compatible: Must be "qcom,devfreq_spdm"
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-clock-names: Clocks used to measure current bus frequency.
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Expected names are "cci_clk"
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-clocks: References to named clocks
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-qcom,spdm-client: Client id of the port being monitored
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-qcom,bw-upstep: Initial up vote size in MB/s
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-qcom,bw-dwnstep: Initial down vote size in MB/s
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-qcom,max-vote: Vote ceiling in MB/s
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-qcom,ports: SPDM ports used by this device
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-qcom,alpha-up: SPDM filter up alpha value
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-qcom,alpha-down: SPDM filter down alpha value
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-qcom,bucket-size: SPDM filter bucket size
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-qcom,pl-freqs: The driver supports different filter values at
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three different performance levels. This value
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defines the cut-over frequenices
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-qcom,reject-rate: Desired rejection rate used to calculate
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SPDM threshold
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-qcom,response-time-us: Desired response time used to calculate
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SPDM threshold
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-qcom,cci-response-time-us: Desired response time used to calculate
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SPDM threshold when CCI is under heavy load
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-qcom,max-cci-freq: CCI frequency at which cci_response_time_us
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is used
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-qcom,up-step-multp: used to increase rate of growth on up votes
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-qcom,spdm-interval: down-vote polling interval
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Example:
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devfreq_spdm_cpu {
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compatible = "qcom,devfreq_spdm";
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qcom,msm-bus,name = "devfreq_spdm";
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qcom,msm-bus,num-cases = <2>;
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qcom,msm-bus,num-paths = <1>;
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qcom,msm-bus,vectors-KBps =
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<1 512 0 0>,
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<1 512 0 0>;
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qcom,spdm-client = <0>;
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clock-names = "cci_clk";
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clocks = <&clock_cpu clk_cci_clk>;
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qcom,bw-upstep = <100>;
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qcom,bw-dwnstep = <100>;
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qcom,max-vote = <10000>;
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qcom,up-step-multp = <2>;
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qcom,spdm-interval = <100>;
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qcom,ports = <16>;
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qcom,alpha-up = <7>;
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qcom,alpha-down = <15>;
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qcom,bucket-size = <8>;
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/*max pl1 freq, max pl2 freq*/
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qcom,pl-freqs = <149999999 150000000>;
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/* pl1 low, pl1 high, pl2 low, pl2 high, pl3 low, pl3 high */
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qcom,reject-rate = <5000 5000 5000 5000 5000 5000>;
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/* pl1 low, pl1 high, pl2 low, pl2 high, pl3 low, pl3 high */
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qcom,response-time-us = <220 220 2000 2000 900 900>;
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/* pl1 low, pl1 high, pl2 low, pl2 high, pl3 low, pl3 high */
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qcom,cci-response-time-us = <50 50 30 30 20 20>;
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qcom,max-cci-freq = <600000000>;
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};
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This device is always used with the SPDM governor which requires a device tree
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entry to know what IRQ to respond to.
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Required properties:
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-compatible Must be "qcom,gov_spdm_hyp"
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-interrupt-names SPDM irq to handle. Name should be "spdm-irq"
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-interrupts The interrupt number the SPDM hw is assigned
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Example:
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devfreq_spdm_gov {
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compatible = "qcom,gov_spdm_hyp";
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interrupt-names = "spdm-irq";
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interrupts = <0 192 0>;
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};
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