linux-kernel - Re: HAVE_CLK (for <linux/clk.h> support)

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Date:	Mon, 1 Sep 2008 17:48:14 +0800
From:	"Bryan Wu" <cooloney@...nel.org>
To:	"David Brownell" <david-b@...bell.net>
Cc:	"Felipe Balbi" <felipebalbi@...rs.sourceforge.net>,
	"Felipe Balbi" <felipe.balbi@...ia.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: HAVE_CLK (for <linux/clk.h> support)

Sorry for jumping in so later. I noticed Blackfin does not support
HAVE_CLK currently.
As the HAVE_CLK dependence is included in the kernel mainline, MUSB
parts do not show up in the Kconfig because of lacking of HAVE_CLK.

To implement clk infrastructure in Blackfin will be later than merging
MUSB Blackfin parts to upstream.

Any idea?

Thanks
-Bryan

On Wed, May 28, 2008 at 9:41 AM, David Brownell <david-b@...bell.net> wrote:
> On Tuesday 27 May 2008, Felipe Balbi wrote:
>> >
>> > I don't know of any other drivers with this particular issue,
>> > but nonetheless ... I think the following is an appropriate
>> > resolution.
>> >
>> > Comments from anyone else?
>>
>> I actually like it. I didn't see this error cuz I was only building
>> musb for arm architecture.
>>
>> But why only davinci and omap?
>
> They're the only one affected by the musb_hdrc patch...
>
>
>> What about: mach-aaec2000, mach-at91, mach-ep93xx, mach-integrator,
>> mach-lh7a40x, mach-ns9xxx, mach-pnx4008, mach-pxa, mach-realview,
>> mach-sa1100, mach-versatile, mach-s3c24x.
>
> If this approach goes forward, I'd expect those platforms
> to "select HAVE_CLK" too.  Ditto some SH, PowerPC, etc.
>
>
>> Instead of making the driver dependant on HAVE_CLK (which would be
>> true for virtually any driver comming from linux-omap), you could make
>> clk_enable a nop in case arch doesn't HAVE_CLK. How does that sound?
>
> Best done by #ifdef HAVE_CLK in <linux/clk.h> support, and
> putting the stubs there.  However, since those platforms
> don't actually have clocks, I'd make them all report errors
> of whichever kind.
>
> That's kind of a second-order question to "should we create
> a HAVE_CLK in Kconfig".  Since Certain People have objected
> to patches touching <linux/clk.h> I avoided doing that the
> first time around ... it'd be a better solution, yes.
>
> - Dave
>
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