linux-kernel - Re: [PATCH 0/4] usb: chipidea: msm: Clean and fix glue layer driver

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Date:	Mon, 11 Nov 2013 16:49:41 +0200
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Peter Chen <peter.chen@...escale.com>
Cc:	alexander.shishkin@...ux.intel.com, gregkh@...uxfoundation.org,
	rob.herring@...xeda.com, pawel.moll@....com, mark.rutland@....com,
	swarren@...dotorg.org, ijc+devicetree@...lion.org.uk,
	davidb@...eaurora.org, linux-usb@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] usb: chipidea: msm: Clean and fix glue layer driver

Hi Peter,

On Mon, 2013-11-11 at 22:02 +0800, Peter Chen wrote: 
> On Mon, Nov 11, 2013 at 03:35:33PM +0200, Ivan T. Ivanov wrote:
> > From: "Ivan T. Ivanov" <iivanov@...sol.com>
> > 
> > Hi, 
> > 
> > This series intend to fixup driver, which was broken for a while. It is 
> > used to create peripheral role device, which in coordination with
> > phy-usb-msm driver (still some cleanups pending) will provide again
> > USB2.0 gadget support for MSM targets.
> > 
> 
> We haven't seen msm chipidea patch for a long time, good news they appear.
> Any plans to use the whole chipidea function for msm controller driver
> (otg, host and peripheral)?
> 

Things are little complicated here :-). Currently qcom,echi-host is
supposed to control host role. Not tested this completely, but this how
is handled also by down stream kernel (codeaurora.org). In this
repo there are even 2 slightly different versions of the driver. 

And OTG and PHY control situations is even ... Currently this
functionality is handled by phy-msm-usb. There is a separate gadget
driver downstream, which seems to be used in production targets. 

My plan is to first port minimal set of changes form downstream kernel
to phy-msm-usb, which will bring up peripheral role. 

Regards,
Ivan

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