linux-kernel - Re: [RFC, PATCH] clocksource: provide timekeeping for efm32 SoCs

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Message-ID: <20130926075855.GH16106@pengutronix.de>
Date:	Thu, 26 Sep 2013 09:58:55 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	John Stultz <john.stultz@...aro.org>
Cc:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kernel@...gutronix.de
Subject: Re: [RFC, PATCH] clocksource: provide timekeeping for efm32 SoCs

On Wed, Sep 25, 2013 at 04:55:15PM -0700, John Stultz wrote:
> On 09/25/2013 04:49 PM, Daniel Lezcano wrote:
> > On 09/25/2013 05:32 PM, Uwe Kleine-König wrote:
> >> Hello Daniel,
> >>
> >> On Wed, Sep 25, 2013 at 04:33:24PM +0200, Daniel Lezcano wrote:
> >>> On 09/16/2013 11:44 AM, Uwe Kleine-König wrote:
> >>>> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
> >>>> index 41c6946..410b152 100644
> >>>> --- a/drivers/clocksource/Kconfig
> >>>> +++ b/drivers/clocksource/Kconfig
> >>>> @@ -70,6 +70,14 @@ config CLKSRC_DBX500_PRCMU_SCHED_CLOCK
> >>>>  	help
> >>>>  	  Use the always on PRCMU Timer as sched_clock
> >>>>  
> >>>> +config CLKSRC_EFM32
> >>>> +	bool "Clocksource for Energy Micro's EFM32 SoCs" if !ARCH_EFM32
> >>>> +	depends on OF && ARM && (ARCH_EFM32 || COMPILE_TEST)
> >>>> +	default ARCH_EFM32
> >>>> +	help
> >>>> +	  Support to use the timers of EFM32 SoCs as clock source and clock
> >>>> +	  event device.
> >>>> +
> >>> No option for the timer. It must be selected by the platform.
> >> It is. If ARCH_EFM32=y there is no prompt and the "default ARCH_EFM32"
> >> makes it true.
> > ok, with that but if ARCH_EFM32=no, you can enable it manually. AFAIK,
> > we want to prevent this and let the correct arch to enable it.
> >
> > John ?
> 
> Right until there's really a compelling reason (which I've still not
> heard), I don't want to introduce independent clocksource options. Any
> such options should be something like a platform or board config option.
You can only manually enable it if you also enabled COMPILE_TEST. Then
the intention is clear, isn't it?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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