📒 笔记文档

查看支持的主频

cat /sys/devices/system/cpu/cpufreq/policy0/scaling_available_frequencies
408000 600000 816000 1104000 1200000 1296000 1416000 1512000 1608000
cat /sys/devices/system/cpu/cpufreq/policy0/scaling_cur_freq
1296000
cat /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
ondemand

在官方提供的根设备树rv1106.dtsi中配置了

cpu0_opp_table: cpu0-opp-table{
 	//前面还有
	opp-1104000000 {
		opp-hz = /bits/ 64 <1104000000>;
		opp-microvolt = <850000 850000 1000000>;
		clock-latency-ns = <40000>;
	};
	opp-1200000000 {
		opp-hz = /bits/ 64 <1200000000>;
		opp-microvolt = <850000 850000 1000000>;
		clock-latency-ns = <40000>;
	};
	//后面还有
}

只需要在板级设备下禁用高的频率

// 在rv1106.dtsi中,限制最高1104000hz
&cpu0_opp_table {
	opp-1200000000 {
		status = "disabled";
	};

	opp-1296000000 {
		status = "disabled";
	};

	opp-1416000000 {
		status = "disabled";
	};

	opp-1512000000 {
		status = "disabled";
	};

	opp-1608000000 {
		status = "disabled";
	};

	opp-1104000000 {
		status = "okay";
	};
};