linux-kernel - Re: DWC2 and/or S3C-HSOTG for STA2X11 board

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Message-ID: <20130716124012.GB15036@arwen.pp.htv.fi>
Date:	Tue, 16 Jul 2013 15:40:12 +0300
From:	Felipe Balbi <balbi@...com>
To:	Federico Vaga <federico.vaga@...il.com>
CC:	<balbi@...com>, Paul Zimmerman <paul.zimmerman@...opsys.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<giancarlo.asnaghi@...com>
Subject: Re: DWC2 and/or S3C-HSOTG for STA2X11 board

On Tue, Jul 16, 2013 at 02:27:43PM +0200, Federico Vaga wrote:
> Thank you Felipe
> 
> [add CC Giancarlo from ST]
> 
> On Tuesday 16 July 2013 15:04:25 Felipe Balbi wrote:
> > Hi,
> > 
> > On Tue, Jul 16, 2013 at 02:01:33PM +0200, Federico Vaga wrote:
> > > Hello,
> > > 
> > > I have an x86 board made by STMicroelectronics (STA2X11) with the Synopsis
> > > USB-OTG DesignWare 2 on it and connected through the PCI-e bus.
> > > 
> > > I know that there are two drivers for the same controller:
> > >    (host)   drivers/staging/dwc2/*
> > >    (device) drivers/usb/gadget/s3c-hsotg.{c|h}
> > > 
> > > So, at the moment I cannot have a board with both host/device working at
> > > the same time. I have to choose to use the block as device or host,
> > > right?
> > > 
> > > I know that the plan is to merge the s3c-hsotg in the dwc2 driver
> > > (https://lwn.net/Articles/540283/). Are still accepted patch to s3c-hsotg?
> > > Or it is work in progress right now (soon), so it is better to wait after
> > > the merge?
> > > 
> > > In order to use the s3c-hsotg I must implement a PCI wrapper that uses
> > > this
> > > driver. It will be accepted in the kernel even if it will be removed
> > > sooner or later because of the driver merge?
> > 
> > currently s3c-hsotg has too much knowledge of the Samsung platform. My
> > suggestion would be to help dwc2 get in better shape. It should be
> > rather easy to support your board since that already has a PCI wrapper
> > driver.
> > 
> > So, stick to host only for now, help clean up dwc2 and move it out of
> > staging, then later it should be fairly simple to merge the device side
> > in it.
> 
> Is there something like a TODO list of dwc2 known problems?

Paul should be the best to answer that :-s

sorry

-- 
balbi

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