linux-kernel - Re: Chipidea ULPI driver

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Message-ID: <20150910151115.GI8982@saruman.tx.rr.com>
Date:	Thu, 10 Sep 2015 10:11:15 -0500
From:	Felipe Balbi <balbi@...com>
To:	Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>
CC:	"balbi@...com" <balbi@...com>,
	Subbaraya Sundeep Bhatta <sbhatta@...inx.com>,
	Peter Chen <peter.chen@...escale.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Greg Kroah-Hartman (gregkh@...uxfoundation.org)" 
	<gregkh@...uxfoundation.org>, "kishon@...com" <kishon@...com>
Subject: Re: Chipidea ULPI driver

(break your lines at 80-characters)

On Thu, Sep 10, 2015 at 02:57:49PM +0000, Punnaiah Choudary Kalluri wrote:
> 
> 
> > -----Original Message-----
> > From: Felipe Balbi [mailto:balbi@...com]
> > Sent: Thursday, September 10, 2015 8:14 PM
> > To: Subbaraya Sundeep Bhatta
> > Cc: Peter Chen; balbi@...com; linux-usb@...r.kernel.org; linux-
> > kernel@...r.kernel.org; Greg Kroah-Hartman
> > (gregkh@...uxfoundation.org); kishon@...com; Punnaiah Choudary Kalluri
> > Subject: Re: Chipidea ULPI driver
> > 
> > (break your lines at 80-characters)
> > 
> > On Thu, Sep 10, 2015 at 12:44:58PM +0000, Subbaraya Sundeep Bhatta wrote:
> > > Hi Peter,
> > >
> > > We are using NOP transceiver driver for USB3320 ULPI PHY with ChipIdea
> > > controller.
> > >
> > > Recently we found that one of the boards (zedboard) requires PHY
> > > register access to set VBUS.
> > >
> > > Note that our local driver we had before migrating to ChipIdea driver
> > > calls otg_ulpi_create with flags  ULPI_OTG_DRVVBUS |
> > > ULPI_OTG_DRVVBUS_EXT so that VBUS is enabled at initialization.
> > >
> > > Can you please let me know how to do this with ChipIdea case? I see
> > > the following solutions:
> > >
> > > 1. Write ULPI driver for USB3320 similar to tusb1210.
> > 
> > this
> 
> How about extending the phy-ulpi driver to use it as platform driver?

this is already doable. See drivers/usb/phy/phy-am335x.c, see how it
uses nop as a library and just adds its own stuff on top.

-- 
balbi

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