linux-kernel - Re: [PATCH 01/19] Add XHFC support for embedded Speech-Design board to hfcmulti

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Date:	Wed, 20 May 2009 14:18:14 +0200
From:	Karsten Keil <keil@...systems.de>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	i4ldeveloper@...tserv.isdn4linux.de,
	Andreas Eversberg <andreas@...rsberg.eu>
Subject: Re: [PATCH 01/19] Add XHFC support for embedded Speech-Design board to hfcmulti

On Mittwoch, 20. Mai 2009 13:38:13 Andi Kleen wrote:
> Hi Karsten,
>
> > This config is not set by mISDN, it is set by somepowerpc  sub arch.
>
> That still seems like a rather quirky way to do this then, making
> drivers dependent on specific architectures. This kind
> of thing lead to ifdef jungles in the past, hopefully not done
> again in new drivers.

Andy,  thanks for you comments.

Yes I did not like this part as well and this was the reason why I did not 
include this patch in my previous update in January. I only fixed some 
codestyle issues now.

Let discuss this with the author (CC'ed now).

>
> Standard ways to handle this:
> - If the driver needs something special only this architecture can
> provide make the architecture set a special HAS... config option.
> - Provide a special asm include file that is stubbed out
> by other architectures.
> - Put the arch specific code in another file and make that dependent on the
> HAS_...  symbol in the Makefile.

Do you have a pointer to a good example here ?

It seems that this architecture (used by an existing embedded board) have
very specific IO method to this hardware so this should go into a separate 
file.

Karsten

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