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

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Date:	Wed, 06 Nov 2013 12:34:30 +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 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.

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.

Regards,

Alistair

> Ben.
> 
> > Alistair: The commit name should be different, it's not a PHY you are
> > adding, it's a PHY interface (the PHY itself is off chip).
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