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

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Message-ID: <A2CA0424C0A6F04399FB9E1CD98E030458DDC71C@US01WEMBX2.internal.synopsys.com>
Date:	Tue, 16 Jul 2013 18:36:21 +0000
From:	Paul Zimmerman <Paul.Zimmerman@...opsys.com>
To:	Federico Vaga <federico.vaga@...il.com>,
	Felipe Balbi <balbi@...com>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
CC:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: DWC2 and/or S3C-HSOTG for STA2X11 board

> From: Federico Vaga [mailto:federico.vaga@...il.com]
> Sent: Tuesday, July 16, 2013 5:02 AM
> 
> 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?

Hi Federico,

As part of the merge, we will need to develop a PCI wrapper for
s3c-hsotg anyway, so I think it would not be wasted effort.
Actually, as a POC I already did this as a quick hack, just to
make sure that the driver will work on our PCIe prototyping
platform (it does).

As Felipe says, currently s3c-hsotg does have too much knowledge
of Samsung platform. But it should be fairly easy to move that
knowledge from the core code to a platform-device wrapper,
similar to platform.c in the dwc2 driver. So if you would like
to work on that (creating a PCI wrapper and a platform wrapper)
I think it would be useful.

If you want, I can send you my hacked-up code for the PCI
version of the driver, to use as a starting point.

-- 
Paul

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