linux-kernel - Re: [PATCH v8 09/16] clockevents/drivers: Add STM32 Timer driver

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Message-ID: <20150519145006.GH2067@n2100.arm.linux.org.uk>
Date:	Tue, 19 May 2015 15:50:07 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Andreas Färber <afaerber@...e.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Rob Herring <robh+dt@...nel.org>,
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	Linus Walleij <linus.walleij@...aro.org>,
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	Nicolae Rosia <nicolae.rosia@...il.com>,
	Kamil Lulko <rev13@...pl>
Subject: Re: [PATCH v8 09/16] clockevents/drivers: Add STM32 Timer driver

On Tue, May 19, 2015 at 04:41:58PM +0200, Maxime Coquelin wrote:
> 2015-05-19 15:49 GMT+02:00 Daniel Lezcano <daniel.lezcano@...aro.org>:
> >
> >
> > It is not exactly as the initial patch.
> >
> > I think Arnd is proposing:
> >
> > config CLKSRC_STM32
> >         bool "Clocksource for STM32 SoCs" if COMPILE_TEST
> >         select CLKSRC_MMIO
> >
> 
> Isn't "depends on OF" missing for COMPILE_TEST case?

config CLKSRC_STM32
	bool "Clocksource for STM32 SoCs" if COMPILE_TEST
	depends on OF
	select CLKSRC_MMIO

This permits CLKSRC_STM32 to be selected by STM32 (provided OF is enabled,
it's always going to be for that case, right?) while allowing the option
to be visible when both OF!=n and COMPILE_TEST!=n.

Remember,

	bool "string" if <condition-affects-visibility-of-string>
	depends on <condition-affects-config-symbol-availability>

The former merely hides the option from the user _if_ the condition fails.
The latter _disables_ the option completely (except if you try and select
it, at which point you end up with a Kconfig warning about that.)

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