linux-kernel - RE: [PATCH 0/4] phy: samsung-usb2: Add support for Vbus regulator

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Date:	Thu, 11 Dec 2014 12:22:56 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Vivek Gautam' <gautam.vivek@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
CC:	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"kishon@...com" <kishon@...com>,
	"k.debski@...sung.com" <k.debski@...sung.com>,
	"kgene@...nel.org" <kgene@...nel.org>,
	"jg1.han@...sung.com" <jg1.han@...sung.com>
Subject: RE: [PATCH 0/4] phy: samsung-usb2: Add support for Vbus regulator

From: Vivek Gautam
> This has been on my to-do list for sometime.
> Until now the host controller (specifically ehci-exynos) is responsible
> for enabling VBUS supply. This opens up one more issue which is, when
> only ohci-exynos is enabled and ehci-exynosis disabled then VBUS was
> never enabled (since ohci did not have the code to enabled the VBUS supply).
> 
> Rather it should be wise to move the VBUS related stuff to phy driver and
> let phy take care of enabling it.
> 
> This patch series adds that VBUS regulator to phy-samsung-usb2 driver,
> adds necessary binding information as well as vbus-supply properties
> to phy nodes on exynos5250 systems.
...

Does this go anyway to allowing devices to be powered from a micro-usb
connector while acting as a USB host (USB OTG).
ie when you want VBUS disabled even though it would normally
need to be enabled.

	David



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