linux-kernel - Re: [Regulator] Request for clarification - GPIO controlled regulator, USB VBUS,

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Message-ID: <20171004112704.beqzaxwsb5tg4nbm@sirena.co.uk>
Date:   Wed, 4 Oct 2017 12:27:04 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Łukasz Majewski <l.majewski@...ess.pl>
Cc:     linux-input@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Liam Girdwood <lgirdwood@...il.com>
Subject: Re: [Regulator] Request for clarification - GPIO controlled
 regulator, USB VBUS,

On Wed, Oct 04, 2017 at 12:45:39PM +0200, Łukasz Majewski wrote:
> > On Tue, Oct 03, 2017 at 06:58:00PM +0200, Łukasz Majewski wrote:

> >  Perhaps this is something
> > that could be implemented generically for USB as it's a hotpluggable bus

> In this case we use VBUS as a power supply voltage. The problem with
> regulator API used in this case is that we enable it on boot-up, but then we
> cannot "symulate hotplug" anymore.

I don't really understand what you mean there, sorry.  The majority of
regulator usage is to supply power, use as reference voltages or
similar.

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