linux-kernel - Re: [PATCH] ARM: OMAP4: USB_EHCI_HCD needs USB_PHY and NOP_USB

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Date:	Tue, 28 May 2013 10:40:38 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Roger Quadros <rogerq@...com>
Cc:	Adrien Vergé <adrienverge@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Florian Fainelli <florian@...nwrt.org>,
	Manjunath Goudar <manjunath.goudar@...aro.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yannick Brosseau <yannick.brosseau@...il.com>,
	"Balbi, Felipe" <balbi@...com>
Subject: Re: [PATCH] ARM: OMAP4: USB_EHCI_HCD needs USB_PHY and NOP_USB_XCEIV

On Tuesday 28 May 2013 11:14:37 Roger Quadros wrote:
> >>         depends on USB_ARCH_HAS_EHCI
> >> +       select USB_PHY if ARCH_OMAP4
> >> +       select NOP_USB_XCEIV if ARCH_OMAP4
> >>         ---help---
> >>           The Enhanced Host Controller Interface (EHCI) is standard for USB 2.0
> >>           "high speed" (480 Mbit/sec, 60 Mbyte/sec) host controller hardware.
> > 
> > 'select'ing USB_PHY sounds wrong too, I think you mean 'depends on'.
> > 
> > Also note that Roger Quadros has just removed the 'select NOP_USB_XCEIV'
> > there, I think you should coordinate with him.
> 
> Selecting NOP_USB_XCEIV is wrong as it in turn depends on USB_PHY.
> 
> I'm not for depends as it would hide USB_EHCI_HCD_OMAP in menuconfig.
> I'm for explicitly selecting both, as it makes the user's life much easier.
> But I'm afraid maintainers might object to that.

My preferred option would be to turn the 'menuconfig PHY' into 'menu',
which is what we did to solve a similar problem in drivers/mfd: It lets
us 'select' specific PHY drivers without turning on the entire
menu. Using 'select PHY' has the nasty side-effect of creating an
incorrect dependency between the OMAP EHCI driver and all the
non-OMAP phy drivers that become visible once the usb-phy directory
gets enabled.

	Arnd
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