linux-kernel - Re: Non-enumerable devices on USB and other enumerable buses

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Message-ID: <20130812113226.GV6427@sirena.org.uk>
Date:	Mon, 12 Aug 2013 12:32:26 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Mark Rutland <mark.rutland@....com>
Cc:	Olof Johansson <olof@...om.net>,
	Alan Stern <stern@...land.harvard.edu>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Pawel Moll <Pawel.Moll@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"devicetree@...nel.org" <devicetree@...nel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Non-enumerable devices on USB and other enumerable buses

On Mon, Aug 12, 2013 at 12:07:14PM +0100, Mark Rutland wrote:

> As I understand it, the wifi chip on the Snow Chromebook has a similar
> issue -- it hangs off of a probeable SDIO bus, but needs a regulator
> poked for it to turn on and become probeable (see
> exynos_wifi_bt_set_power in [1]).

Yes, that's another example - this stuff is really common in practical
systems, especially the power control for radios since that's how rfkill
tends to end up being implemented.

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