由于电压供应不对引起
microvolt = <3300000>;
改为microvolt = <3000000>;
后噪声消除了!
原始电压:
vcc3v0_pmu: LDO_REG4 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <3000000>;
regulator-max-microvolt = <3000000>;
regulator-name = "vcc3v0_pmu";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <3000000>;
};
};
修改后的电压:
vcc3v0_pmu: LDO_REG4 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-name = "vcc3v0_pmu";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <3300000>;
};
};