linux-kernel - Re: [PATCH 20/22] clocksource/drivers/exynos_mct: Fix Kconfig and add COMPILE

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Message-id: <563806E7.6010105@samsung.com>
Date:	Tue, 03 Nov 2015 09:59:19 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>, tglx@...utronix.de
Cc:	john.stultz@...aro.org, linux-kernel@...r.kernel.org,
	arnd@...db.de, Russell King <linux@....linux.org.uk>,
	Kukjin Kim <kgene@...nel.org>,
	"moderated list:ARM SUB-ARCHITECT..." 
	<linux-arm-kernel@...ts.infradead.org>,
	"moderated list:ARM/SAMSUNG EXYNO..." 
	<linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH 20/22] clocksource/drivers/exynos_mct: Fix Kconfig and add
 COMPILE_TEST option

On 03.11.2015 09:30, Krzysztof Kozlowski wrote:
> On 02.11.2015 21:56, Daniel Lezcano wrote:
>> Let the platform's Kconfig to select the clock instead of having a reverse
>> dependency from the driver to the platform options.
> 
> Selecting user-visible symbols is rather discouraged so why not
> something like this:
> 
> -       def_bool y if ARCH_EXYNOS
> -       depends on !ARM64
> +       bool "Exynos multi core timer driver"
> +       depends on ARCH_EXYNOS || (COMPILE_TEST && ARM)

Nope, that was wrong as we loose auto-select on Exynos. Instead:
-       def_bool y if ARCH_EXYNOS
-       depends on !ARM64
+       bool "Exynos multi core timer driver" if ARM
+       depends on ARCH_EXYNOS || COMPILE_TEST
+       default y if ARCH_EXYNOS

This way we avoid select (which is a reverse dependency for the driver),
have it auto-selectable and compile tested on arm.

Best regards,
Krzysztof

> 
>>
>> Add the COMPILE_TEST option for the compilation test coverage. Due to the
>> non portable 'delay' code, this driver is only compilable on ARM.
>>
>> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
>> ---
>>  arch/arm/mach-exynos/Kconfig | 1 +
>>  drivers/clocksource/Kconfig  | 4 ++--
>>  2 files changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
>> index 3a10f1a..ff10539 100644
>> --- a/arch/arm/mach-exynos/Kconfig
>> +++ b/arch/arm/mach-exynos/Kconfig
>> @@ -27,6 +27,7 @@ menuconfig ARCH_EXYNOS
>>  	select SRAM
>>  	select THERMAL
>>  	select MFD_SYSCON
>> +	select CLKSRC_EXYNOS_MCT
>>  	help
>>  	  Support for SAMSUNG EXYNOS SoCs (EXYNOS4/5)
>>  
>> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
>> index 916c36d..d829cbe 100644
>> --- a/drivers/clocksource/Kconfig
>> +++ b/drivers/clocksource/Kconfig
>> @@ -213,8 +213,8 @@ config CLKSRC_METAG_GENERIC
>>  	  This option enables support for the Meta per-thread timers.
>>  
>>  config CLKSRC_EXYNOS_MCT
>> -	def_bool y if ARCH_EXYNOS
>> -	depends on !ARM64
>> +	bool "Exynos multi core timer driver" if COMPILE_TEST
>> +	depends on ARM
>>  	help
>>  	  Support for Multi Core Timer controller on Exynos SoCs.
>>  
>>
> 
> 

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