linux-kernel - Re: [PATCH 03/12] clocksource: sti: Provide 'use timer as sched clock' capability

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Date:	Mon, 11 May 2015 10:47:44 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Paul Bolle <pebolle@...cali.nl>, Lee Jones <lee.jones@...aro.org>
CC:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel@...inux.com, devicetree@...r.kernel.org, tglx@...utronix.de,
	wim@...ana.be, a.zummo@...ertech.it,
	linux-watchdog@...r.kernel.org, rtc-linux@...glegroups.com,
	linux@...ck-us.net
Subject: Re: [PATCH 03/12] clocksource: sti: Provide 'use timer as sched clock'
 capability

On 05/08/2015 01:47 PM, Paul Bolle wrote:
> On Fri, 2015-05-08 at 11:29 +0100, Lee Jones wrote:
>> Ah, you mean from menuconfig.  I almost forgot what that was. ;)
>>
>> I can add a menu option, no problem.
>
> It's not just menuconfig:
>      $ grep -e CONFIG_ARCH_STI -e CONFIG_CLKSRC_ST_LPC .config
>      CONFIG_ARCH_STI=y
>      CONFIG_CLKSRC_ST_LPC=y
>      CONFIG_CLKSRC_ST_LPC_TIMER_SCHED_CLOCK=y
>      $ vim .config
>      $ grep -e CONFIG_ARCH_STI -e CONFIG_CLKSRC_ST_LPC .config
>      CONFIG_ARCH_STI=y
>      # CONFIG_CLKSRC_ST_LPC is not set
>      # CONFIG_CLKSRC_ST_LPC_TIMER_SCHED_CLOCK is not set
>      $ make ARCH=arm silentoldconfig
>      scripts/kconfig/conf  --silentoldconfig Kconfig
>      #
>      # configuration written to .config
>      #
>      $ grep -e CONFIG_ARCH_STI -e CONFIG_CLKSRC_ST_LPC .config
>      CONFIG_ARCH_STI=y
>      CONFIG_CLKSRC_ST_LPC=y
>      CONFIG_CLKSRC_ST_LPC_TIMER_SCHED_CLOCK=y
>
> So I think that, if you want to be able to set
> CLKSRC_ST_LPC_TIMER_SCHED_CLOCK to 'n' even though CLKSRC_ST_LPC is 'y',
> you need to add a prompt. Or have you found a way around this?

The general policy is to have non-prompted options in the clocksource's 
Kconfig and let the platform's config to select the right components.


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