linux-kernel - Re: [PATCH] USB: otg: twl4030: fix phy initialization(v1)

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Message-ID: <20100910123119.GB31230@legolas.emea.dhcp.ti.com>
Date:	Fri, 10 Sep 2010 15:31:19 +0300
From:	Felipe Balbi <balbi@...com>
To:	venki kaps <venkiece2005@...il.com>
Cc:	"Balbi, Felipe" <balbi@...com>, Ming Lei <tom.leiming@...il.com>,
	"greg@...ah.com" <greg@...ah.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Felipe Balbi <me@...ipebalbi.com>,
	"Gadiyar, Anand" <gadiyar@...com>
Subject: Re: [PATCH] USB: otg: twl4030: fix phy initialization(v1)

Hi,

On Thu, Sep 09, 2010 at 12:28:27PM -0500, venki kaps wrote:
>one thing i have not understood, why it requires to power down when
>the device is booted without
>a USB cable?

why would the phy be powered up for no use ?

>After booting, just attach/detach the usb cable, then i have not seen
>any issue with power numbers in off mode, RETENTION and active states.

that's because if you boot without cable the phy is left alive,
consuming power for nothing.

-- 
balbi
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