linux-kernel - Re: [RFC/PATCH 1/5] usb: otg: add notifier support

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Date:	Tue, 26 Jan 2010 07:16:49 -0800
From:	David Brownell <david-b@...bell.net>
To:	felipe.balbi@...ia.com
Cc:	ext Oliver Neukum <oliver@...kum.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Anton Vorontsov <avorontsov@...mvista.com>,
	Grazvydas Ignotas <notasas@...il.com>,
	Madhusudhan Chikkature <madhu.cr@...com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"Greg Kroah-Hartman" <gregkh@...e.de>
Subject: Re: [RFC/PATCH 1/5] usb: otg: add notifier support

On Tuesday 26 January 2010, Felipe Balbi wrote:
> but when suspended, we have to cut power ASAP. If not enumerated we can 
> still draw power for a few miliseconds due to dead battery provision.

When suspended, it's OK to draw a small amount of power.
On the order of one milliamp, based on the config that's
active ... instead of, often, hundreds.

That limit is why for example a PXA 255 could never get
certified as a bus-powered peripheral.  It required much
more than that when in suspend mode.

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