linux-kernel - RE: Chipidea ULPI driver

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Date:	Thu, 10 Sep 2015 14:57:49 +0000
From:	Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>
To:	"balbi@...com" <balbi@...com>,
	Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
CC:	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



> -----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?
So that boards that are using the ulpi compatible phy and driving vbus from the phy
can use this driver.

Regards,
Punnaiah
> 
> > 2. Write ci_hdrc_zynq.c which does PHY access required for Zynq.
> 
> not this
> 
> --
> balbi
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