linux-kernel - Re: [PATCH 20/22] clocksource/drivers/exynos_mct: Fix Kconfig and add COMPILE

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Date:	Tue, 3 Nov 2015 07:18:36 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Kukjin Kim <kgene@...nel.org>,
	"moderated list:ARM SUB-ARCHITECT..." 
	<linux-arm-kernel@...ts.infradead.org>,
	"moderated list:ARM/SAMSUNG EXYNO..." 
	<linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH 20/22] clocksource/drivers/exynos_mct: Fix Kconfig and add
 COMPILE_TEST option

On Tue, Nov 3, 2015 at 2:02 AM, Arnd Bergmann <arnd@...db.de> wrote:
> I suspect this will come up again in the future. The problem is
> really that drivers/clocksource has different rules from almost
> everything else, by requiring the platform to 'select' the driver.
>
> The second version that Krzysztof posted is how we handle this in
> other driver subsystems, and I would generally prefer it to do this
> consistently for everything, but John Stultz has in the past argued
> strongly for using 'select' in all clocksource drivers. The reason
> is that for each platform we know in advance which driver we want,
> and there is never a need for the user to have to select the right
> one.

And just to clarify, I don't necessarily think "select" is the right
method, as creating an option that defaults to Y if the right
architecture/platform support is present is fine too.

I just don't want users to have to search deeply through menuconfig to
find a clocksource driver checkbox when they have already selected a
platform and provided enough information for us to know which
clocksource driver is needed.  So my argument its really all about
avoiding user-prompts in kconfig for clocksources.  It is conceptually
easier to do this w/ select, but you can also do it via default y and
proper dependencies.

thanks
-john
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