linux-kernel - Re: [PATCH] platform/chrome: Make CROS_EC

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Date:	Tue, 18 Aug 2015 15:02:26 +0200
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:	Olof Johansson <olof@...om.net>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Doug Anderson <dianders@...omium.org>,
	Gwendal Grignou <gwendal@...omium.org>,
	Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/chrome: Make CROS_EC_PROTO a user selectable
 option

Hello Bartlomiej,

Thanks a lot for your feedback.

On 08/18/2015 02:40 PM, Bartlomiej Zolnierkiewicz wrote:
> 
> Hi,
> 
> On Tuesday, August 18, 2015 09:15:06 AM Javier Martinez Canillas wrote:
>> The boolean CROS_EC_PROTO symbol is selected by MFD_CROS_EC but that can
>> cause Kconfig circular dependencies so is better to change the select to
> 
> Could you please give a reference to the problem or error message
> that you're getting (I was not following the previous discussion).
>

Yes, the original Kconfig warning message was:

warning: (MFD_CROS_EC) selects CHROME_PLATFORMS which has unmet direct dependencies (X86 || ARM)

Paul fixed on [0] by making MFD_CROS_EC depends on X86 || ARM but that
is not really true since the driver could be used in other platforms so
I tried to instead fix it by removing unneeded dependencies in [1] but
one of the patches was nacked by Geert [2] who mentioned the issue about
mixing select and "depends on".

>> a depends on. But in order to be able to change that, the CROS_EC_PROTO
>> symbol has to be one that can be selected by the user.
> 
> Looking at the code behind the config option it seems that it is just
> a helper library and should not be made user-visible.  Why can't

Yeah, I in fact used as a reference the DRM/KMS helpers (DRM_KMS_HELPER)
that is selected by drivers instead of depending on it.

> the issue be fixed the other way (make other config options select
> CROS_EC_PROTO consistently)?
>

That is another option indeed. I thought that the use of select was
discouraged and that it was preferable to use "depends on" even when
the Kconfig symbol is a boolean to enable support for some helpers.

But I don't really have a strong opinion on either approach tbh.
 
> Best regards,
> --
> Bartlomiej Zolnierkiewicz
> Samsung R&D Institute Poland
> Samsung Electronics
> 

[0]: https://lkml.org/lkml/2015/6/20/219
[1]: https://lkml.org/lkml/2015/6/24/689
[2]: https://lkml.org/lkml/2015/8/17/103

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America
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