linux-kernel - Re: [PATCH 0/2] add regulator driver and mfd cell for Intel Cherry Trail Whiskey Cove PMIC

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Date:   Fri, 25 Oct 2019 13:05:06 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Andrey Zhizhikin <andrey.z@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        lgirdwood@...il.com, lee.jones@...aro.org,
        linux-kernel@...r.kernel.org,
        Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>
Subject: Re: [PATCH 0/2] add regulator driver and mfd cell for Intel Cherry
 Trail Whiskey Cove PMIC

On Fri, Oct 25, 2019 at 12:45:30PM +0200, Hans de Goede wrote:

> Hmm, I do just realize that the regulator subsystem turns off regulators
> which are not in use from its pov, which would be kinda bad here.

It will only do this for regulators which have constraints which
enable the kernel to change the power state of the regulator, the
regulator core will never make any change to hardware that was
not explicitly permitted by constraints so should be perfectly
safe unless constraints are provided in which case it's up to
whoever provides the constraints to make sure they are safe.

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