linux-kernel - Re: [PATCH v3] ARM: at91: Fix link breakage when !CONFIG

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Date:	Mon, 27 May 2013 14:42:12 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] ARM: at91: Fix link breakage when !CONFIG_PHYLIB

On Monday 27 May 2013 14:05:13 Nicolas Ferre wrote:
> On 27/05/2013 12:48, Alexandre Belloni :
> A v3 is not needed simply for this. Thanks, anyway!
> 
> One question though: why not just add
> 
>          select PHYLIB
> 
> In Kconfig entry:
> 
>   config MACH_SAMA5_DT
> 
> ?
> 
> (note that I like to play with everybody's nerves ;-))

That would make it impossible to build a sama5 kernel without networking
support, which is probably not what you want.

Jean-Christophe's suggestion to add the inline helper is best. Aside from
that, please note that

> > diff --git a/arch/arm/mach-at91/board-dt-sama5.c b/arch/arm/mach-at91/board-dt-sama5.c
> > index 705305e..e9ce541 100644
> > --- a/arch/arm/mach-at91/board-dt-sama5.c
> > +++ b/arch/arm/mach-at91/board-dt-sama5.c
> > @@ -47,22 +47,24 @@ static int ksz9021rn_phy_fixup(struct phy_device *phy)
> >   #define GMII_ERCR	11
> >   #define GMII_ERDWR	12
> >
> > -	/* Set delay values */
> > -	value = GMII_RCCPSR | 0x8000;
> > -	phy_write(phy, GMII_ERCR, value);
> > -	value = 0xF2F4;
> > -	phy_write(phy, GMII_ERDWR, value);
> > -	value = GMII_RRDPSR | 0x8000;
> > -	phy_write(phy, GMII_ERCR, value);
> > -	value = 0x2222;
> > -	phy_write(phy, GMII_ERDWR, value);
> > +	if (IS_BUILTIN(CONFIG_PHYLIB)) {
> > +		/* Set delay values */
> > +		value = GMII_RCCPSR | 0x8000;
> > +		phy_write(phy, GMII_ERCR, value);
> > +		value = 0xF2F4;
> > +		phy_write(phy, GMII_ERDWR, value);
> > +		value = GMII_RRDPSR | 0x8000;
> > +		phy_write(phy, GMII_ERCR, value);
> > +		value = 0x2222;
> > +		phy_write(phy, GMII_ERDWR, value);
> > +	}
> >
> >   	return 0;
> >   }

This part of the patch is not actually needed if you

> >   static void __init sama5_dt_device_init(void)
> >   {
> > -	if (of_machine_is_compatible("atmel,sama5d3xcm"))
> > +	if (of_machine_is_compatible("atmel,sama5d3xcm") && IS_BUILTIN(CONFIG_PHYLIB))
> >   		phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
> >   			ksz9021rn_phy_fixup);

do this change, or the inline helper.

	Arnd
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