linux-kernel - Re: [PATCH 4/4 v2] [RFC] UIO: generic platform driver

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Date:	Fri, 11 Apr 2008 13:17:03 +0200
From:	"Hans J. Koch" <hjk@...utronix.de>
To:	Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
Cc:	"Hans J. Koch" <hjk@...utronix.de>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4 v2] [RFC] UIO: generic platform driver

On Fri, Apr 11, 2008 at 01:03:58PM +0200, Uwe Kleine-König wrote:
> Hello,
> 
> Hans J. Koch wrote:
> > On Fri, Apr 11, 2008 at 11:21:58AM +0200, Uwe Kleine-König wrote:
> > > 
> > > Below is a new version that uses linux/stringify and zeros size for
> > > unused mappings (line 102ff).
> > 
> > Thanks, but it doesn't compile, neither with -rc8 nor with Linus' git.
> > 
> > One problem can easily be fixed, the macro is called __stringify, not
> > stringify.
> I just notice that, too.  My mail address that and your's just crossed
> each other.
>  
> > But what about this:
> > 
> > ERROR: "clk_get" [drivers/uio/uio_pdrv.ko] undefined!
> > ERROR: "clk_enable" [drivers/uio/uio_pdrv.ko] undefined!
> > ERROR: "clk_disable" [drivers/uio/uio_pdrv.ko] undefined!
> > ERROR: "clk_put" [drivers/uio/uio_pdrv.ko] undefined!
> > 
> > Do you have any extra patches applied?
> Yes I have, but nothing special.  This is part of a generic API defined
> in include/linux/clk.h.  One of it's use it to abstract away some
> platform dependencies.  There are several architectures that define
> it[1].

I know. Unfortunately, I tested on x86_64, and it doesn't compile.
If it's depending on something, then this dependency should be added in
Kconfig. If it can be selected in the configuration, I expect it to
compile (and work).

Thanks,
Hans


> I used it to allow enabling the device only when the device is
> opened.  Typical things in the enable routine are enabling a clock or
> reserve and configure gpios etc.
> 
> A minimal dummy implementation that should work here is:
> 
> 	#define clk_get(dev, id)	NULL
> 	#define clk_put(clk)		((void)0)
> 	#define clk_enable(clk)		(1)
> 	#define clk_disable(clk)	((void)0)
> 
> Best regards
> Uwe
> 
> [1] Try:
> 
> 	git ls-files -z | xargs -0 perl -n -e 'print "$ARGV\n" if /EXPORT_SYMBOL(?:_GPL)?\s*\(\s*clk_get\s*\)/;'
> 
> -- 
> Uwe Kleine-König, Software Engineer
> Digi International GmbH Branch Breisach, Küferstrasse 8, 79206 Breisach, Germany
> Tax: 315/5781/0242 / VAT: DE153662976 / Reg. Amtsgericht Dortmund HRB 13962
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