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

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Date:	Wed, 25 Sep 2013 16:55:15 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
CC:	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 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.

thanks
-john

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