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>> pinctrl-0 = <&pinctrl_rtc>; >> interrupts-extended = <&gpio3 24 IRQ_TYPE_LEVEL_LOW>; >> + /* >> + * While specifying the vdd-supply is normally not strictly necessary, >> + * here it also makes sure that the PMIC driver enables the level- >> + * shifter for the RTC before the RTC is probed. >> + */ >> + vdd-supply = <®_vdd_3v3>; > > Dose reg_vdd_3v3 controller by gpio, or actually it is level shifter? As I explained in the commit message, reg_vdd_3v3 is a regulator provided by the PCA9450 PMIC that feeds the RTC. At the same time the PCA9450 PMIC also provides a level-shifter that is used to bring the I2C data lines to the correct level for the RTC.