linux-kernel - Re: [PATCH v2 01/03] clocksource: Add Kconfig entries for CMT, MTU2, TMU and STI

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Date:	Thu, 14 Nov 2013 13:40:37 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	John Stultz <john.stultz@...aro.org>
Cc:	Magnus Damm <magnus.damm@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	khilman@...aro.org, linux-sh@...r.kernel.org,
	daniel.lezcano@...aro.org, horms@...ge.net.au, olof@...om.net,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 01/03] clocksource: Add Kconfig entries for CMT, MTU2, TMU and STI

On Wednesday 13 November 2013, John Stultz wrote:
> > +config EM_TIMER_STI
> > +       bool "STI timer driver"
> > +       default y if ARM
> > +       help
> > +         This enables build of the STI timer driver.
> 
> 
> So since I do want to avoid adding user-selectable configs if
> possible, here are some concrete thoughts on this patch, trying to
> provide an example from my more abstract rants down thread. :)

I think we should be using the CONFIG_BUILD_TEST (or whatever
it's called) here to allow building the drivers everywhere but
at the same time be specific with the platform. How about this:

config EM_TIMER_STI
	bool "Renesas EMMA EV2 STI timer driver" if BUILD_TEST && !ARCH_EMEV2
	default ARCH_EMEV2
	help
	  ...

This makes it a silent option that is set correctly all the time
but lets you enable it everywhere when BUILD_TEST is set.

We could skip the "&& !ARCH_EMEV2" part to allow building an
EMEV2 kernel without this driver when build testing if that
is possible.

	Arnd
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