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

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Message-ID: <20171004145710.kk5bmuf3fqqmiuqv@sirena.co.uk>
Date:   Wed, 4 Oct 2017 15:57:10 +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 01:54:49PM +0200, Łukasz Majewski wrote:
> > 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:

> > > 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.

> I do use "regulator-fixed" to control VBUS.

> The USB driver used regulator_enable/disable to supply power of VBUS.

> What I do want to achieve:

> For testing purpose I would like to enable/disable this supply (VBUS) and
> force/restart of re-enumeration.

I'm having a hard time connecting that with what you wrote above or with
the suggestion to do this in the USB framework, sorry.

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