netdev - Re: [PATCH] phylib: make mdio-gpio work without OF (v2)

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Date:	Wed, 5 Nov 2008 00:34:56 -0500
From:	"Mike Frysinger" <vapier.adi@...il.com>
To:	"David Brownell" <david-b@...bell.net>
Cc:	"Grant Likely" <grant.likely@...retlab.ca>,
	"Paulius Zaleckas" <paulius.zaleckas@...tonika.lt>,
	netdev@...r.kernel.org, linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-embedded@...r.kernel.org,
	"Laurent Pinchart" <laurentp@...-semaphore.com>
Subject: Re: [PATCH] phylib: make mdio-gpio work without OF (v2)

On Tue, Nov 4, 2008 at 23:45, David Brownell wrote:
> On Tuesday 04 November 2008, Mike Frysinger wrote:
>> > That's generally the preferred way to handle #ifdeffery.
>> > But I could imagine OF isn't (yet?) set up to handle it.
>>
>> i agree completely with the inclination to do it all in C as you've
>> suggested and let the compiler do dead code elimination, but that only
>> works if the functions in question are defined everywhere (in other
>> words, there's a linux/ api for it).  i dont think that's the case for
>> OF (which is what you were implying?) ...
>
> Only works if the functions are "declared" everywhere;
> the stuff that's included in header files.
>
> A "definition" would be available at link time (except
> for inlined functions, in headers).  Actual C functions.
>
> If indeed OF functions don't have declarations which are
> available on all platforms, that might be worth fixing
> to enable this approach to #ifdef elimination.

OF is open firmware right ?  no way there's going to be OF for every
port that supports GPIO, so filling out the stubs in linux/of_gpio.h
will need to be done.
-mike
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