linux-kernel - Re: [PATCH] regulator: arizona-ldo1: Add ramp time for HI

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Message-ID: <20150324160609.GD17265@sirena.org.uk>
Date:	Tue, 24 Mar 2015 09:06:09 -0700
From:	Mark Brown <broonie@...nel.org>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	lgirdwood@...il.com, linux-kernel@...r.kernel.org,
	patches@...nsource.wolfsonmicro.com
Subject: Re: [PATCH] regulator: arizona-ldo1: Add ramp time for HI_PWR

On Tue, Mar 24, 2015 at 02:27:56PM +0000, Charles Keepax wrote:

> +static int arizona_ldo1_hc_set_voltage_time_sel(struct regulator_dev *rdev,
> +						unsigned int old_selector,
> +						unsigned int new_selector)
> +{
> +	/* if moving to 1.8v allow time for it to reach voltage */
> +	if (new_selector == rdev->desc->n_voltages - 1)
> +		return 25;
> +	else
> +		return 0;
> +}

So changes to move to the top voltage always take constant time while
all other voltage changes are instantaneous?  That doesn't seem right.
I'd expect something more like a calculation based on some number of
miliseconds per milivolt.

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