38 lines
1.5 KiB
Text
38 lines
1.5 KiB
Text
QTI BWMON Driver
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The QTI BWMON Driver monitors bandwidth counters that represent the read/write
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traffic through various interconnects in the system and uses this data to vote
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for DCVS HW (memory) frequencies. Each device represents a separate bandwidth
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monitor present on the Qualcomm Technologies, Inc. (QTI) chipset. This driver
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is a refactor of the bimc-bwmon driver that was previously developed.
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Required properties:
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- compatible: Must be "qcom,bwmon", "qcom,bwmon2", "qcom,bwmon3"
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"qcom,bwmon4", or "qcom,bwmon5"
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- reg: Pairs of physical base addresses and region sizes of
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memory mapped registers.
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- reg-names: Names of the bases for the above registers. Expected
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bases are: "base", "global_base"
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- interrupts: Lists the threshold IRQ.
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- qcom,mport: The hardware master port that this device can monitor
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- qcom,target-dev: A phandle to the QTI DCVS HW device node that this
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node will be using for voting in the SLOW path.
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- qcom,hw-timer-hz: Hardware sampling rate in Hz. This field must be
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specified for "qcom,bwmon4"
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Optional properties:
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- qcom,byte-mid-match: Byte count MID match value
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- qcom,byte-mid-mask: Byte count MID mask value
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- qcom,count-unit: Number of bytes monitor counts in
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Example:
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bwmon_llcc: qcom,bwmon-llcc@90b6400 {
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compatible = "qcom,bwmon4";
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reg = <0x90b6400 0x300>, <0x90b6300 0x200>;
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reg-names = "base", "global_base";
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interrupts = <GIC_SPI 581 IRQ_TYPE_LEVEL_HIGH>;
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qcom,mport = <0>;
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qcom,hw-timer-hz = <19200000>;
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qcom,count-unit = <0x10000>;
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qcom,target-dev = <&qcom_llcc_dcvs_hw>;
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};
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