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How to detect ramp-up/down for internal analog LDO?

Question asked by Takayuki Ishii on Jun 30, 2019
Latest reply on Jul 2, 2019 by Takayuki Ishii

Hello community,

 

To ramp-up/down internal LDO of i.mx6,

Digital LDO(ARM, SOC, PU) can detect by control voltage raum-up time.

So it can calculate a wait time in function set_ldo_voltage() of uboot-imx/tree/arch/arm/mach-imx/mx6/soc.c

 

But for analog LDO(1p1, 3p0, 2p5) it have no method to control ramp-up/down time.

 

I think that status bits, OK_VDDxxx and BO_VDDxxx, in each regulator register(PMU_REG_xxx)

can use to detect ramp-up/down timing.

Can it use to detect ramp-up/down for each analog LDO?

If so, I hope some sample code to control voltage of analog LDO.

 

Best regards,

Ishii.

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