linux-kernel - Re: [PATCH v2] ARM: at91: Fix link breakage when !CONFIG

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Date:	Sat, 25 May 2013 22:05:57 +0200
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ARM: at91: Fix link breakage when !CONFIG_PHYLIB

On 09:39 Sat 25 May     , Alexandre Belloni wrote:
> Fixes:
> arch/arm/mach-at91/built-in.o: In function `ksz9021rn_phy_fixup':
> :(.text+0x1174): undefined reference to `mdiobus_write'
> :(.text+0x1188): undefined reference to `mdiobus_write'
> :(.text+0x119c): undefined reference to `mdiobus_write'
> :(.text+0x11b0): undefined reference to `mdiobus_write'
> arch/arm/mach-at91/built-in.o: In function `sama5_dt_device_init':
> :(.init.text+0x1e34): undefined reference to `phy_register_fixup_for_uid'
> 
> when CONFIG_PHYLIB is not selected.
> ---
> Changes in v2:
> 	use IS_BUILTIN
> 	use CONFIG_PHYLIB and not CONFIG_PHY
> 

I do not like this, I prefer we just drop the fixup by adding the dt support
to the micrel phy as done for broadcom

if !PHYLIB just add an inline declaration of 
phy_register_fixup_for_uid

so gcc will drop ksz9021rn_phy_fixup automatically

Best Regards,
J.
> 
>  arch/arm/mach-at91/board-dt-sama5.c | 22 ++++++++++++----------
>  1 file changed, 12 insertions(+), 10 deletions(-)
> 
> 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;
>  }
>  
>  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);
>  
> -- 
> 1.8.1.2
> 
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