Re: [PATCH v4 4/4] regulator: Prevent falling too fast

From: Mark Brown
Date: Wed Dec 14 2016 - 08:21:32 EST

On Tue, Dec 13, 2016 at 12:00:32PM -0800, Doug Anderson wrote:
> On Tue, Dec 13, 2016 at 9:19 AM, Mark Brown <broonie@xxxxxxxxxx> wrote:

> > No, not unless the prior descriptions of the hardware have been wildly
> > inaccurate - my understanding had been that the DCDC was a normal DCDC
> > with an analogue input intended to be biased to set the output voltage
> > (presumably in terms of a full rail supply) and that the PWM had been
> > connected to this analogue input. If the PWM is supplying the DCDC then
> > the hardware design just seems bizzare, I can't see how this would even
> > work.

> As you can see from the datasheet ("Adjusting the Output Voltage"
> section), it is intended that you stuff a resistor to make a voltage
> divider and that's how you select the output voltage. In our case the

OK, that's what I thought was happening. That's definitely something
that should *not* end up in ->supply, that should hold the parent supply
that the DCDC is regulating down to the target voltage.

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