42、Linux系统功耗管理全解析

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于 2025-07-13 13:18:00 发布

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分类专栏：嵌入式Linux编程精要与实战文章标签： Linux功耗管理 CPUFreq OPP

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Linux系统功耗管理全解析

1. CPUFreq驱动及OPP定义

在了解CPUFreq驱动的运行时细节位置后，我们来看看如何在编译时定义运行点（Operating Points, OPPs）。以BeagleBone Black为例，其OPPs编码在设备树中，如下是 am33xx.dtsi 的部分内容：

cpu0_opp_table: opp-table {
     compatible = "operating-points-v2-ti-cpu";
     syscon = <&scm_conf>;
     […]
     opp50-300000000 {
           opp-hz = /bits/ 64 <300000000>;
           opp-microvolt = <950000 931000 969000>;
           opp-supported-hw = <0x06 0x0010>;
           opp-suspend;
     };
     […]
     opp100-600000000 {
           opp-hz = /bits/ 64 <600000000>;
           opp-microvolt = <1100000 1078000 1122000>;
           opp-supported-hw = <0x06 0x0040>;
     };
     […]
     opp120-720000000 {
           opp-hz =