| MSM Maximum Current Throttling (MSM-MCT) driver |
| |
| The MCT driver provides support to enable/disable the MCT |
| mechanism and to modify the MCT control parameters. The |
| MCT mechanism's main goal is to limit the CPU's max power |
| consumption over a period of time by assessing the number |
| and type of instructions that are executed and then by mitigating |
| the CPU's instruction execution rate. The MCT works on a user |
| defined power budget for every cycle and when the CPU's average |
| power consumption exceeds this budget for a particular period of time, |
| then the CPU's instruction execution rate is throttled. |
| |
| The devicetree representation of the MCT block should be: |
| Required Properties: |
| - compatible : "qcom,max-current-throttling" |
| |
| Optional Properties: |
| - qcom,mct-wr-weight : Energy weight of integer instruction. |
| - qcom,mct-vxwr-weight : Energy weight of VeNum arithmetic operations. |
| - qcom,mct-vlswr-weight : Energy weight of VeNum memory operations. |
| - qcom,mct-vaw-energy : Energy associated with clocking the VeNum unit. |
| - qcom,mct-ulim : The maximum energy debt that can be incurred |
| before throttling will be engaged. |
| - qcom,mct-dcnt : The per-cycle energy budget. |
| - <mct-regulator-name>-supply = <&phandle_of_regulator> : mct-regulator-name |
| is the regulator name that's defined in the mct |
| driver. phandle_of_regulator should be the phandle |
| for mct regulator, defined by regulator device tree. |
| - qcom,mct-regulators : List of MCT regulators corresponding to each CPU. |
| These regulators will be enabled/disabled, whenever |
| the MCT feature for that particular CPU is |
| enabled/disabled in the driver. User can specify |
| regulators for specific CPU's and give empty string |
| for the rest. The phandle for the regulator supply |
| should be defined. |
| |
| Example: |
| qcom,msm-mct { |
| compatible = "qcom,max-current-throttling"; |
| krait0-mct-supply = <&krait0_adj_reg>; |
| krait1-mct-supply = <&krait1_adj_reg>; |
| krait2-mct-supply = <&krait2_adj_reg>; |
| krait3-mct-supply = <&krait3_adj_reg>; |
| qcom,mct-regulators = "krait0-mct", "krait1-mct", |
| "krait2-mct", "krait3-mct"; |
| qcom,mct-wr-weight = <0x14221120>; |
| qcom,mct-vxwr-weight = <0xf8436430>; |
| qcom,mct-vlswr-weight = <0xa5846330>; |
| qcom,mct-vaw-energy = <0x1>; |
| qcom,mct-ulim = <0x007f>; |
| qcom,mct-dcnt = <0x0c>; |
| }; |
