linux-kernel - Re: [PATCH 1/3] regulator: core: fix boot-on regulators use

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Date:   Mon, 23 Sep 2019 11:14:31 -0700
From:   Mark Brown <broonie@...nel.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Marco Felsch <m.felsch@...gutronix.de>, zhang.chunyan@...aro.org,
        Liam Girdwood <lgirdwood@...il.com>,
        ckeepax@...nsource.cirrus.com, LKML <linux-kernel@...r.kernel.org>,
        Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH 1/3] regulator: core: fix boot-on regulators use_count
 usage

On Mon, Sep 23, 2019 at 11:02:26AM -0700, Doug Anderson wrote:

> I will freely admit my ignorance here, but I've always been slightly
> confused by the "always-on" vs. "boot-on" distinction...

> The bindings say:

>   regulator-always-on:
>     description: boolean, regulator should never be disabled

>   regulator-boot-on:
>     description: bootloader/firmware enabled regulator

> For 'boot-on' that's a bit ambiguous about what it means.  The
> constraints have a bit more details:

Boot on means that it's powered on when the kernel starts, it's
for regulators that we can't read back the status of.

> ...but then that begs the question of why we have two attributes?
> Maybe this has already been discussed before and someone can point me
> to a previous discussion?  We should probably make it more clear in
> the bindings and/or the constraints.

boot-on just refers to the status at boot, we can still turn
those regulators off later on if we want to.

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