From: Mark Brown <broonie@kernel.org>
To: Mike Looijmans <mike.looijmans@topic.nl>
Cc: Vincent Whitchurch <vincent.whitchurch@axis.com>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
balbi@kernel.org, gregkh@linuxfoundation.org,
lgirdwood@gmail.com
Subject: Re: [PATCH v3] usb: dwc3: Add support for VBUS power control
Date: Mon, 27 Jul 2020 11:23:17 +0100 [thread overview]
Message-ID: <20200727102317.GA6275@sirena.org.uk> (raw)
In-Reply-To: <e63ee918-c9e3-a8ee-e7c5-577b5a3e09be@topic.nl>
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On Sun, Jul 26, 2020 at 09:10:39AM +0200, Mike Looijmans wrote:
> On 23-07-2020 13:05, Mark Brown wrote:
> > Does the device actually support running without power so that's a thing
> > that can happen? _get_optional() should only ever be used for supplies
> > that may be physically absent.
> It's the 5V VBUS power for the USB "plug" that's being controlled here. It
> must turned on when the controller is in "host" mode. Some boards arrange
> this in hardware through the PHY, and some just don't have any control at
> all and have it permanently on or off. On a board where the 5V is controlled
> using a GPIO line or an I2C chip, this patch is required to make it work.
That sounds like the driver should not be using _get_optional() then.
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next prev parent reply other threads:[~2020-07-27 10:23 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-19 14:25 [PATCH v3] usb: dwc3: Add support for VBUS power control Mike Looijmans
2020-07-23 7:56 ` Vincent Whitchurch
2020-07-23 11:05 ` Mark Brown
[not found] ` <1b153bce-a66a-45ee-a5c6-963ea6fb1c82.949ef384-8293-46b8-903f-40a477c056ae.2698920d-90ba-4c46-abda-83e18e2093c8@emailsignatures365.codetwo.com>
[not found] ` <1b153bce-a66a-45ee-a5c6-963ea6fb1c82.0d2bd5fa-15cc-4b27-b94e-83614f9e5b38.ac9c2a67-d7df-4f70-81b3-db983bbfb4db@emailsignatures365.codetwo.com>
2020-07-26 7:10 ` Mike Looijmans
2020-07-27 10:23 ` Mark Brown [this message]
2020-07-27 11:50 ` Mike Looijmans
2020-07-27 11:53 ` Mark Brown
2020-07-28 7:29 ` Mike Looijmans
2020-09-07 7:44 ` Felipe Balbi
2020-09-07 7:50 ` Mike Looijmans
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