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

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Date:	Tue, 4 Jun 2013 15:49:01 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] ARM: at91: Fix link breakage when !CONFIG_PHYLIB

On 27/05/2013 14:42, Arnd Bergmann :
> 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.

It seems that it has been clearly rejected by David. So the best 
solution remains to...

> 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.

... simply use this "IS_BUILTIN(CONFIG_PHYLIB)" here -----^^^^^^^^^ (and 
not above as suggested by Arnd).

Jean-Christophe, Alexandre: do you agree with this conclusion?

I plan to stack this patch for next at91-fixes batch.

Bye,
-- 
Nicolas Ferre
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