linux-kernel - Re: [PATCH v2 3/3] drivers: cleanup Kconfig stuff

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Message-ID: <AANLkTikkMphKa2DGGtWxy-3LpFX0kn92UEYPj==Euzok@mail.gmail.com>
Date:	Tue, 19 Oct 2010 14:36:32 +0300
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	balbi@...com
Cc:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	linux-omap <linux-omap@...r.kernel.org>,
	linux-main <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>, Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH v2 3/3] drivers: cleanup Kconfig stuff

On Tue, Oct 19, 2010 at 2:16 PM, Felipe Balbi <balbi@...com> wrote:
> On Tue, Oct 19, 2010 at 05:59:58AM -0500, Felipe Contreras wrote:
>>
>> The USB_MUSB_HDRC dependency on NOP_USB_XCEIV || TWL4030_USB is
>> already there, I'm just making it explicit. The rest are not
>> dependencies, just sensible defaults, and they are already in
>> drivers/usb/musb/Kconfig, I'm just moving them.
>
> might be true, but what will happen is that other developers will just
> "follow what's in the tree" so they'll keep on adding more and more
> "sesible defaults" to this line.

That is actually the intention.

> Linus had some really good comments about Kconfig usage some time ago
> and I'm sure he wouldn't like us adding "sensible defaults" all over the
> place.

It's the other way around. He wanted to get rid of defconfigs
completely by moving the complexity to Kconfigs:
http://article.gmane.org/gmane.linux.kernel/994720
http://article.gmane.org/gmane.linux.kernel/994706
http://article.gmane.org/gmane.linux.kernel/994718

You seem to be pushing for the exact opposite; keep the complexity on
the defconfigs and the burden on the user creating configs.

>> If you have a better approach to avoid manually selecting TWL4030_USB
>> on defconfigs, and making sure USB_MUSB_HDRC works, please share it.
>
> that's the thing. Currently, I don't think it should be automatic as we
> can only have one transceiver structure. Look into
> drivers/usb/otg/otg.c, it's just a static global pointer on that file,
> which prevents us from having a working solution if you enable more than
> one transceiver.
>
> Ideally there would be a class or something similar to allow us to
> register N transceiver and use the correct one in runtime, that would
> make distro-makers' life easier. It'll probably help Linaro also at some
> point, but as of today, enabling more than one transceiver will never
> work.

Ok. But for now 'default y if ARCH_OMAP3' for TWL4030_USB doesn't
hurt, nor increases the total size of Kconfigs, and solves a real
problem.

-- 
Felipe Contreras
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