netdev - Re: [PATCH 1/2 v4] fs_enet/mii-fec.c: fix MII speed calculation

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Date:	Fri, 17 Jul 2009 14:32:45 +0200
From:	Wolfgang Denk <wd@...x.de>
To:	Wolfram Sang <w.sang@...gutronix.de>
cc:	linuxppc-dev@...abs.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2 v4] fs_enet/mii-fec.c: fix MII speed calculation

Dear Wolfram Sang,

In message <20090717093307.GB3150@...gutronix.de> you wrote:
> 
...
> > @@ -188,6 +209,12 @@ static struct of_device_id fs_enet_mdio_fec_match[] = {
> >  	{
> >  		.compatible = "fsl,pq1-fec-mdio",
> >  	},
> > +#if defined(CONFIG_PPC_MPC512x)
> > +	{
> > +		.compatible = "fsl,mpc5121-fec-mdio",
> > +		.data = mpc5xxx_get_bus_frequency,
> > +	},
> > +#endif
>
> Grepping through 'drivers/*' I see that #ifdefing compatible-entries is highly
> uncommon (just 3 hits). I think a guideline would be useful. Most people like
> to avoid #ifdefs at any cost, while I personally think it doesn't spoil
> readability too much here. Other opinions?

An older version of the patch tried to "hide" the ifdef in a 512x
specific header, so at least common code would remain clean, but I
agree with Grant that this current version looks cleaner globally.

Best regards,

Wolfgang Denk

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