linux-kernel - Re: [PATCH v1 6/9] usb: xhci: Add NVIDIA Tegra XHCI host-controller driver

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Message-Id: <201407101240.56828.arnd@arndb.de>
Date:	Thu, 10 Jul 2014 12:40:56 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Andrew Bresticker <abrestic@...omium.org>,
	Julius Werner <jwerner@...omium.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-doc@...r.kernel.org,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	Grant Likely <grant.likely@...aro.org>,
	Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH v1 6/9] usb: xhci: Add NVIDIA Tegra XHCI host-controller driver

On Wednesday 09 July 2014, Alan Stern wrote:
> On Tue, 8 Jul 2014, Andrew Bresticker wrote:
> 
> > > I think at the very least you should add a function
> > > "xhci_default_driver(struct hc_driver *driver)" to xhci-plat.c (or
> > > even better to xhci.c and use it for PCI as well) that initializes all
> > > function pointers to the default (internal) symbols, and can then be
> > > overridden afterwards.
> > 
> > Currently all XHCI host drivers (PCI, platform, MVEBU) will be built
> > into the xhci-hcd module.  I could append the Tegra driver to that
> > module or introduce a xhci_init_driver() like EHCI does as Julius
> > suggests.  USB folks, do you have a preference?
> 
> As the EHCI maintainer, I naturally approve of Julius's suggestion.  

I'm not a USB maintainer, but I also agree that's the best way forward,
since it's similar to what all other similar drivers in the kernel do.

	Arnd
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