From: "Łukasz Majewski" <l.majewski@majess.pl>
To: Mark Brown <broonie@kernel.org>
Cc: linux-input@vger.kernel.org,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Liam Girdwood <lgirdwood@gmail.com>
Subject: Re: [Regulator] Request for clarification - GPIO controlled regulator, USB VBUS,
Date: Wed, 4 Oct 2017 13:54:49 +0200 [thread overview]
Message-ID: <abe393e3-66fe-3c00-8b87-2375cc01d6f5@majess.pl> (raw)
In-Reply-To: <20171004112704.beqzaxwsb5tg4nbm@sirena.co.uk>
Hi Mark,
> 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.
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.
> The majority of
> regulator usage is to supply power, use as reference voltages or
> similar.
>
--
Best regards.
Łukasz Majewski
next prev parent reply other threads:[~2017-10-04 12:02 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-03 16:58 Łukasz Majewski
2017-10-03 19:16 ` Dmitry Torokhov
2017-10-03 20:25 ` Łukasz Majewski
2017-10-04 10:32 ` Mark Brown
2017-10-04 10:45 ` Łukasz Majewski
2017-10-04 11:27 ` Mark Brown
2017-10-04 11:54 ` Łukasz Majewski [this message]
2017-10-04 14:57 ` Mark Brown
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