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

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Message-ID: <20160331183130.GR2350@sirena.org.uk>
Date:	Thu, 31 Mar 2016 11:31:30 -0700
From:	Mark Brown <broonie@...nel.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	Bjorn Andersson <bjorn@...o.se>,
	Bjorn Andersson <bjorn.andersson@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Liam Girdwood <lgirdwood@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Gandhar Dighe <gdighe@...dia.com>,
	Stuart Yates <syates@...dia.com>
Subject: Re: [PATCH 1/2] regulator: DT: Add support to scale ramp delay based
 on platform behavior

On Thu, Mar 31, 2016 at 11:17:38PM +0530, Laxman Dewangan wrote:

> HW and chip team did simulation with tegra and PMIC and found that the board
> needs more capacitance then what Vendor recommended for proper signal
> conditioning on interface. So they put the difference capactitance value and
> this causes deviation in ramp delay from advertised value. In out design, we
> measured the ramp time as 50mv/us when PMIC is configured for 100mV/us.

> So for all settling time, we need to use the ramp as 50mV/us.

> From DT, I will provide regulator-ramp-delay as 50mv/us.

> But I do not have property for saying 100mv/us for PMIC configurations and
> this is what makes need of 2nd property.

So the PMIC actually has a setting for the rate you're seeing but for
some resaon you can't use it?

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