linux-kernel - Re: [PATCH 2/3] net/fec: add device tree support

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Date:	Sun, 19 Jun 2011 10:09:15 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Arnd Bergmann <arnd@...db.de>, Shawn Guo <shawn.guo@...aro.org>
CC:	linux-arm-kernel@...ts.infradead.org,
	Greg Ungerer <gerg@...pgear.com>, patches@...aro.org,
	netdev@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	Jason Liu <jason.hui@...aro.org>, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 2/3] net/fec: add device tree support

On 06/19/2011 07:11 AM, Arnd Bergmann wrote:
> On Sunday 19 June 2011 13:39:32 Greg Ungerer wrote:
>>> +#ifdef CONFIG_OF
>>> +static const struct of_device_id fec_dt_ids[] = {
>>> +     { .compatible = "fsl,fec", .data =&fec_devtype[0], },
>>> +     {},
>>> +};
>>> +
>>> +static const struct of_device_id *
>>> +fec_get_of_device_id(struct platform_device *pdev)
>>> +{
>>> +     return of_match_device(fec_dt_ids,&pdev->dev);
>>> +}
>>> +#else
>>> +#define fec_dt_ids NULL
>>> +static inline struct of_device_id *
>>> +fec_get_of_device_id(struct platform_device *pdev)
>>> +{
>>> +     return NULL;
>>> +}
>>> +#endif
>>> +
>>>   static unsigned char macaddr[ETH_ALEN];
>>>   module_param_array(macaddr, byte, NULL, 0);
>>>   MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
>>> @@ -1363,6 +1385,11 @@ fec_probe(struct platform_device *pdev)
>>>       struct net_device *ndev;
>>>       int i, irq, ret = 0;
>>>       struct resource *r;
>>> +     const struct of_device_id *of_id;
>>> +
>>> +     of_id = fec_get_of_device_id(pdev);
>>
>> fec_get_of_device_id() is defined inside of "#ifdef CONFIG_OF". This
>> use of it will break compilation when this is not defined.
>>
> 
> 
> Why? Note the #else path defining an empty function.
> 

None of this is necessary in the first place. Just call of_match_device
directly. There is already an empty function to return NULL when
CONFIG_OF is not defined.

Rob
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