linux-kernel - Re: [PATCH v5] extcon: add Maxim MAX3355 driver

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Message-id: <5677662C.6060409@samsung.com>
Date:	Mon, 21 Dec 2015 11:38:36 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"myungjoo.ham@...sung.com" <myungjoo.ham@...sung.com>,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-sh@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v5] extcon: add Maxim MAX3355 driver

Hi,

On 2015년 12월 21일 02:15, Sergei Shtylyov wrote:
> Hello.
> 
> On 12/20/2015 05:31 PM, Chanwoo Choi wrote:
> 
>> This patch depend on GPIOLIB configuration as following:
>> I modified it with following diff and applied it.
>>
>> diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
>> index ba4db7d..3d89e60 100644
>> --- a/drivers/extcon/Kconfig
>> +++ b/drivers/extcon/Kconfig
>> @@ -54,6 +54,7 @@ config EXTCON_MAX14577
>>
>>   config EXTCON_MAX3355
>>          tristate "Maxim MAX3355 USB OTG EXTCON Support"
>> +       depends on GPIOLIB || COMPILE_TEST
> 
>    If it won't compile w/o gpiolib, what's the use of COMIPLE_TEST?
>    And no, it shouldn't depend on gpiolib. It has empty stubs for the case of CONFIG_GPIOLIB=n. Obviously something is wrong with the GPIO headers, I'll look into it.

Yes. When GPIOLIB is disabled, the build issue don't happen.
because include/linux/gpio/consumer.h implement the dummy function
for all gpio functions if CONFIG_GPIOLIB is disabled.

For correct operation of max3355, you should add the dependency 
to the extcon-max3355.c driver. This driver use the GPIO library
certainly.

COMPILE_TEST is used for just build test. You can see the detailed data[1].
[1] https://lkml.org/lkml/2013/5/22/155

Thanks,
Chanwoo Choi
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