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

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Date:	Tue, 28 May 2013 12:17:16 +0300
From:	Roger Quadros <rogerq@...com>
To:	Arnd Bergmann <arnd@...db.de>
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 05/28/2013 11:40 AM, Arnd Bergmann wrote:
> 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.
>

Good idea, thanks. I will give this a try.

cheers,
-roger
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