linux-kernel - Re: [PATCH 2/2] iio:adc: at91 requires the input subsystem

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Message-ID: <536BBF78.7080100@metafoo.de>
Date:	Thu, 08 May 2014 19:31:36 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org, Josh Wu <josh.wu@...el.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: Re: [PATCH 2/2] iio:adc: at91 requires the input subsystem

On 05/08/2014 07:22 PM, Alexandre Belloni wrote:
> Hi,
>
> On 08/05/2014 at 16:56:24 +0200, Arnd Bergmann wrote :
>> Building the at91 adc driver with CONFIG_INPUT disabled results in this
>> build error:
>>
>> ERROR: "input_event" [drivers/iio/adc/at91_adc.ko] undefined!
>> ERROR: "input_unregister_device" [drivers/iio/adc/at91_adc.ko] undefined!
>> ERROR: "input_free_device" [drivers/iio/adc/at91_adc.ko] undefined!
>> ERROR: "input_register_device" [drivers/iio/adc/at91_adc.ko] undefined!
>> ERROR: "input_set_abs_params" [drivers/iio/adc/at91_adc.ko] undefined!
>> ERROR: "input_allocate_device" [drivers/iio/adc/at91_adc.ko] undefined!
>>
>> To make sure we can build random configurations, this turns on CONFIG_INPUT
>> whenever CONFIG_AT91_ADC is enabled.
>>
>
> I'm wondering wether we should make part of the driver compile only if
> CONFIG_INPUT is defined. Maybe some user will want to use the ADC and
> not have any input on their board.
>
> What do you think ?
>

This typically just leads to more build errors. E.g. if INPUT is defined as 
a module, but AT91_ADC is build in. I think it is very rare to see a 
configuration without INPUT set, other then a randconfig.

- Lars
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