linux-kernel - Re: [PATCH 2/2] ARM: dts: omap5: Add dr

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Date:	Thu, 11 Sep 2014 12:14:39 -0500
From:	Felipe Balbi <balbi@...com>
To:	Dmitry Lifshitz <lifshitz@...pulab.co.il>
CC:	<balbi@...com>, Roger Quadros <rogerq@...com>,
	Kishon Vijay Abraham I <kishon@...com>,
	<bcousson@...libre.com>, <tony@...mide.com>,
	<rob.herring@...xeda.com>, <pawel.moll@....com>,
	<mark.rutland@....com>, <swarren@...dotorg.org>,
	<ijc+devicetree@...lion.org.uk>, <linux@....linux.org.uk>,
	<linux-omap@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	George Cherian <george.cherian@...com>
Subject: Re: [PATCH 2/2] ARM: dts: omap5: Add dr_mode for dwc3

On Wed, Sep 10, 2014 at 03:03:33PM +0300, Dmitry Lifshitz wrote:
> Hi,
> 
> On 09/08/2014 04:24 PM, Felipe Balbi wrote:
> >Hi,
> >
> >On Mon, Sep 08, 2014 at 02:34:33PM +0300, Dmitry Lifshitz wrote:
> >>Hi Felipe, Roger
> >>
> >>On 04/16/2014 07:16 PM, Felipe Balbi wrote:
> >>>On Fri, Oct 11, 2013 at 05:46:12PM +0300, Roger Quadros wrote:
> >>>>Hi,
> >>>>
> >>>>On 10/10/2013 01:49 PM, Kishon Vijay Abraham I wrote:
> >>>>>From: George Cherian <george.cherian@...com>
> >>>>>
> >>>>>Added dr_mode property in dwc3 and set its default mode to device.
> >>>>
> >>>>If there is a specific reason why this is not set to "otg", we need
> >>>>to explain it here.
> >>>>
> >>>>AFAIK the port is meant to be used as OTG port.
> >>>
> >>>we still don't have the workaround for dual role ports, I've been
> >>>working on it but still need to retest and make sure it's working fine
> >>>before merging upstream.
> >>>
> >>
> >>
> >>Does the OTG port suppose to work with OMAP5? I mean role switching
> >>mechanism?
> >>
> >>I'm testing kernel v3.16 with OMAP5 based board (CM-T54).
> >>
> >>If I set CONFIG_USB_DWC3_DUAL_ROLE, than nothing is going on when I plug
> >>some device/host cable into micro USB3.0 port (VBUS/ID detection with extcon
> >>events works fine).
> >
> >Dual role does not work. We allow the driver to the built with both Host
> >and Peripheral support because some platforms have more than one port
> >and building the driver with dual role allows us to make one port host
> >and one peripheral.
> >
> 
> Please, can you provide some detail about platforms with several ports.
> How do that ports are connected to DWC3?

you have several dwc3 instances.

-- 
balbi

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