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Re: [PATCH 1/2] regulator: DT: Add support to scale ramp delay based on platform behavior

From Laxman Dewangan <ldewangan@nvidia.com>
Newsgroups linux.kernel
Subject Re: [PATCH 1/2] regulator: DT: Add support to scale ramp delay based on platform behavior
Date 2016-03-16 12:50 +0100
Message-ID <rdi7F-8pT-19@gated-at.bofh.it> (permalink)
References (4 earlier) <r85NL-1Xc-9@gated-at.bofh.it> <r85Xs-20z-5@gated-at.bofh.it> <r86JQ-2xU-5@gated-at.bofh.it> <rcXFU-2Ox-11@gated-at.bofh.it> <rcYsi-3mN-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Tuesday 15 March 2016 08:18 PM, Mark Brown wrote:
> * PGP Signed by an unknown key
>
> On Tue, Mar 15, 2016 at 07:11:23PM +0530, Laxman Dewangan wrote:
>
>> So here we will need two parameters:
>> advertised-ramp-delay for PMIC configurations and
>> ramp-delay which is measured one.
>> Most of time, advertised-ramp-delay is same as ramp-delay and hence one
>> value from DT will be sufficient.
>> If there is difference then both value can be provided and
>> advertised-ramp-delay  will be used for PMIC configuration and rest of
>> calculation about delay will be from ramp-delay.
> This sounds more like the difference between typical and maximum spec
> values than anything else, we are looking for maxima in Linux.
>

Maxim datasheet does not say about the typical/maximum. It has only one 
value and that is typical.
However, it has note on the advertised values as:

Note 20.
During a soft-start event or a DVS transition, the regulators output 
current will increase by COUT*dV/dt. In the event that the load current 
plus the additional current imposed by the soft-start or DVS transition, 
reach the regulator’s current limit, the current limit will be enforced. 
When the current limit is enforced, the advertised transition rate 
(dV/dt) will not occur.

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Re: [PATCH 1/2] regulator: DT: Add support to scale ramp delay based  on platform behavior Laxman Dewangan <ldewangan@nvidia.com> - 2016-03-15 15:00 +0100
  Re: [PATCH 1/2] regulator: DT: Add support to scale ramp delay based  on platform behavior Mark Brown <broonie@kernel.org> - 2016-03-15 15:50 +0100
    Re: [PATCH 1/2] regulator: DT: Add support to scale ramp delay based  on platform behavior Laxman Dewangan <ldewangan@nvidia.com> - 2016-03-16 12:50 +0100

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