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

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Message-ID: <20100126191506.GD20049@nokia.com>
Date:	Tue, 26 Jan 2010 21:15:06 +0200
From:	Felipe Balbi <felipe.balbi@...ia.com>
To:	"Balbi Felipe (Nokia-D/Helsinki)" <felipe.balbi@...ia.com>
Cc:	ext David Brownell <david-b@...bell.net>,
	"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

Hi,

On Tue, Jan 26, 2010 at 08:09:34PM +0100, Balbi Felipe (Nokia-D/Helsinki) wrote:
>well, if you have access to twl5031 docs you'd understand what I'm
>talking about, the charger detection involves at least 3 blocks on
>twl5031 plus musb to enable/disable pullups. The sequence is pretty much
>as below:

there's more which I forgot:

>1. vbus irq
>2. usb_gadget_disconnect()
>3. disable usb ldos

3.1 put transceiver in non-drivig mode

>4. switch usb3v1 supply from vbat to vbus (to let charger detection work
>on low bat)
>5. enable usb3v1 *only*
>6. call the notifier chain
>7. BCC module kicks charger detection
>8. disable usb3v1
>9. switch usb3v1 supply back to vbat

9.1 put transceiver back to normal mode

>10. enable usb ldos
>11. usb_gadget_connect() (necessary since we might be connected to
>charging port)

now it should be all fine.

-- 
balbi
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