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

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Date:	Mon, 21 Dec 2015 14:01:53 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Chanwoo Choi <cw00.choi@...sung.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

Hello.

On 12/21/2015 5:38 AM, 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.

    What? It surely does happen!

> because include/linux/gpio/consumer.h implement the dummy function
> for all gpio functions if CONFIG_GPIOLIB is disabled.

    Linus W. advised to #include this header explicitly -- I'll try and post.

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

    I disagree. The driver will just cease to load in this case. I don't see 
why we need such dependency. Only compilation time dependencies should be
specified, I think.

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

    I know. Re-read my question please.

> Thanks,
> Chanwoo Choi

MBR, Sergei

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