linux-kernel - Re: [PATCH] gpio: palmas: add dt support

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Date:	Thu, 28 Mar 2013 08:55:20 -0600
From:	Stephen Warren <swarren@...dia.com>
To:	Laxman Dewangan <ldewangan@...dia.com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH] gpio: palmas: add dt support

On 03/27/2013 11:59 PM, Laxman Dewangan wrote:
> On Wednesday 27 March 2013 06:30 PM, Linus Walleij wrote:
>> On Thu, Mar 21, 2013 at 3:30 PM, Laxman Dewangan
>> <ldewangan@...dia.com> wrote:
>>
>>> +#ifdef CONFIG_OF
>>> +static struct of_device_id of_palmas_gpio_match[] = {
>>> +       { .compatible = "ti,palmas-gpio"},
>>> +       { },
>>> +};
>>> +MODULE_DEVICE_TABLE(of, of_palmas_gpio_match);
>>> +#endif
>>
>> But please drop the #ifdef here unless it causes compile errors
>> (I don't think it will.)
>>
> 
> I am using this table as
> 
> driver.of_match_table = of_match_ptr(of_palmas_gpio_match),
> of_match_ptr is macro which is NULL in case of CONFIG_OF not defined.
> So if I remove ifdefs then it may create build warning as unused variable.

I think Linus's point is that you can simply remove the use of
of_match_ptr(). The only disadvantage of doing so is that the table will
always be included in the object file, but it's so small that it's
probably not worth worrying about.
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