linux-kernel - RE: [PATCH 2/9][v2]usb:fsl:otg: Add support to add/remove usb host driver

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Date:	Mon, 20 Apr 2015 13:38:58 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Ramneek Mehresh <ramneek.mehresh@...escale.com>
cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"balbi@...com" <balbi@...com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: RE: [PATCH 2/9][v2]usb:fsl:otg: Add support to add/remove usb host
 driver

On Mon, 20 Apr 2015, Ramneek Mehresh wrote:

> > > This is the wrong way to connect platform-private data with the
> > > ehci_hcd structure.  The right way is to use an ehci_driver_overrides
> > > structure, like in ehci-omap.c and quite a few other EHCI platform drivers.
> > >
> >
> Hi Alan, I checked again...we are not connecting ehci_hcd structure here with 
> platform-private data. We are just having a wrapper on it to have some additional 
> Information that can be used for ehci fsl driver. This additional information is 
> private to ehci fsl driver, and is mainly used for otg driver functionality and to
> save/restore fsl regsiters during deep-sleep 

It doesn't matter -- private data is private data, whether it is
platform-private or driver-private.

Either way, you can't wrap ehci-hcd in anything.  The private data has
to added to the end, the way ehci-omap.c does it.

Alan Stern

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