netdev - Re: [PATCH 3/7] IBM Akebono: Add support for a new PHY to the IBM emac driver

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Message-ID: <9251129.ZkATbJnO5N@mexican>
Date:	Thu, 07 Nov 2013 13:39:10 +1100
From:	Alistair Popple <alistair@...ple.id.au>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 3/7] IBM Akebono: Add support for a new PHY to the IBM emac driver

On Wed, 6 Nov 2013 16:40:10 Ben Hutchings wrote:
> On Wed, 2013-11-06 at 12:34 +1100, Alistair Popple wrote:
> > On Tue, 5 Nov 2013 23:11:50 Ben Hutchings wrote:
> > > On Wed, 2013-11-06 at 06:54 +1100, Benjamin Herrenschmidt wrote:
> > [snip]
> > 
> > > > It's an SoC bit so there's little point making it generally
> > > > selectable by the user.
> > > 
> > > I think a better way to do this is:
> > > 
> > > config IBM_EMAC_RGMII_WOL
> > > 
> > > 	bool "IBM EMAC RGMII wake-on-LAN support"
> > > 	depends on MY_WONDERFUL_NEW_SOC || COMPILE_TEST
> > > 	default y if MY_WONDERFUL_NEW_SOC
> > > 
> > > Then anyone making an API change that affects this driver can check that
> > > it still complies.
> > 
> > The method used in this patch is the same as what is currently used by the
> > other IBM EMAC PHY interfaces (eg. config IBM_EMAC_ZMII etc). I'm happy to
> > send a patch to update all of those as well for consistency but that would
> > mean adding what each platform requires into EMACS Kconfig as well.
> > 
> > Personally I think it is nicer to keep the definitions of what each
> > platform requires in one place (ie. arch/powerpc/platforms/44x/Kconfig)
> > as it is consistent with what we do for other 44x drivers, however I am
> > happy to use the above method if people think it's better.
> 
> Yes, I see your point.
> 
> > Alternatively we could do something like this:
> > 
> > config IBM_EMAC_RGMII_WOL
> > 
> >         bool
> >         default y if COMPILE_TEST
> >         default n
> > 
> > This would leave the platform dependencies as they are currently but still
> > allow compile testing.
> 
> It still shouldn't default to y in that case.  Instead you can make the
> symbol conditionally configurable:
> 
> config IBM_EMAC_RGMII_WOL
> 	bool "IBM EMAC RGMII wake-on-LAN support" if COMPILE_TEST
> 
> and then select this from your platform Kconfig as you intended.

That looks reasonable - I will include it in the next version of the patch 
series. Thanks.

> (There is no need to put 'default n' as that's implicit for a
> configurable symbol.  But it doesn't hurt either.)
> 
> Ben.

Alistair
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