linux-kernel - Re: [RFC PATCH 2/5] USB: remove USB_EHCI_BIG_ENDIAN_{DESC,MMIO} depends on architecture symbol

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Message-ID: <Pine.LNX.4.44L0.1303261506500.999-100000@iolanthe.rowland.org>
Date:	Tue, 26 Mar 2013 15:08:37 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Arnd Bergmann <arnd@...db.de>
cc:	Florian Fainelli <florian@...nwrt.org>,
	<linux-kernel@...r.kernel.org>, <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>
Subject: Re: [RFC PATCH 2/5] USB: remove USB_EHCI_BIG_ENDIAN_{DESC,MMIO}
 depends on architecture symbol

On Tue, 26 Mar 2013, Arnd Bergmann wrote:

> On Tuesday 26 March 2013, Florian Fainelli wrote:
> > 
> > Just like the OHCI counter part we just can remove the architecture
> > specific symbols which prevent these configuration symbols from being
> > selected by platforms/architectures requiring it. The original
> > implementation did not scale at all since it required each and every
> > single architecture to be added for these configuration symbols to be
> > selected. Now it is up to the EHCI driver and/or platform to select
> > these configuration symbols accordingly.
> > 
> > Signed-off-by: Florian Fainelli <florian@...nwrt.org>
> 
> Good idea, just one suggestion:
> 
> >  config USB_EHCI_BIG_ENDIAN_MMIO
> >         bool
> > -       depends on USB_EHCI_HCD && (PPC_CELLEB || PPC_PS3 || 440EPX || \
> > -                                   ARCH_IXP4XX || XPS_USB_HCD_XILINX || \
> > -                                   PPC_MPC512x || CPU_CAVIUM_OCTEON || \
> > -                                   PMC_MSP || SPARC_LEON || MIPS_SEAD3)
> > -       default y
> > +       depends on USB_EHCI_HCD
> > +       default n
> >  
> >  config USB_EHCI_BIG_ENDIAN_DESC
> >         bool
> > -       depends on USB_EHCI_HCD && (440EPX || ARCH_IXP4XX || XPS_USB_HCD_XILINX || \
> > -                                   PPC_MPC512x || PMC_MSP || SPARC_LEON || \
> > -                                   MIPS_SEAD3)
> > -       default y
> > +       depends on USB_EHCI_HCD
> > +       default n
> >  
> >  config XPS_USB_HCD_XILINX
> >         bool "Use Xilinx usb host EHCI controller core"
> 
> You can drop the "default n" line as well, it's the default.

The "depends on USB_EHCI_HCD" isn't really needed either.  The build 
system might get confused if platform code selects 
USB_EHCI_BIG_ENDIAN_DESC but for some reason USB_EHCI_HCD isn't 
enabled.

Alan Stern

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