Messages in this thread | | | Date | Fri, 1 Apr 2016 01:18:23 +0530 | From | Laxman Dewangan <> | Subject | Re: [PATCH 1/2] regulator: DT: Add support to scale ramp delay based on platform behavior |
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On Friday 01 April 2016 12:52 AM, Mark Brown wrote: > * PGP Signed by an unknown key > > On Fri, Apr 01, 2016 at 12:29:05AM +0530, Laxman Dewangan wrote: >> On Friday 01 April 2016 12:29 AM, Mark Brown wrote: >> But here is the stuff without typo ;-) >> Device supports 5mV/us and 100mV/us which is not in observed value. > So why doesn't the device end up configuring 100mV/us when asked for > 50mv/us? That's reasonably expected - the configured ramp rate is a > maximum rate given that this is used to limit inrush current. > >
We did this to adjust device configuration to nearest higher side but this is not working well on some of cases.
On same device, DCDC (SD) rails support 4 ramp configurations, 13.75mV/us, 27.5mV/us, 55mV/us and 100mV/us.
HW team measured the ramp time at 7.5mV/us when device configured at 27.5mV/uS.
So as per above, it will be adjusted to 13.75mV/us (nearest higher side) for device configuration but this device need to configure for 27.5mV/us.
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