linux-kernel - Re: [PATCH v2] usb: host: make USB_ARCH_HAS

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Message-ID: <Pine.LNX.4.44L0.1306041410530.1093-100000@iolanthe.rowland.org>
Date:	Tue, 4 Jun 2013 14:11:32 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Arnd Bergmann <arnd@...db.de>
cc:	linux-usb@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] usb: host: make USB_ARCH_HAS_?HCI obsolete

On Tue, 4 Jun 2013, Arnd Bergmann wrote:

> The three options USB_ARCH_HAS_{EHCI,OHCI,XHCI} are all well beyond
> their recommended shelf life. They have caused numerous build failures
> over the years because they are never completely correct, and with
> the move to splitting out the platform specific back-ends out of the
> driver, there is no real need for them any more. Also, the use of making
> USB_ARCH_HAS_HCD depend on it is questionable since one can always enable
> dummy_hc these days.
> 
> This patch enables them unconditionally for all platforms and
> architectures, which means it is now possible to build host controller
> drivers for machines that are known not to come with this hardware,
> but that is just how we treat most other drivers.
> 
> In order to minimise the impact on existing architecture code and
> defconfig files, all the Kconfig are left present for now. All platforms
> that currently do 'select USB_ARCH_HAS_*' should subsequently be changed
> not to select that. All drivers depending on USB_ARCH_HAS_HCD should
> be changed to depend on USB_SUPPORT instead.

Acked-by: Alan Stern <stern@...land.harvard.edu>

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