linux-kernel - Re: [RFC PATCH] ARM: clocksource: make ARM_GLOBAL

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Date:	Thu, 4 Feb 2016 14:41:29 -0800
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Grygorii Strashko <grygorii.strashko@...com>
CC:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	<linux-arm-kernel@...ts.infradead.org>, <tony@...mide.com>,
	<nsekhar@...com>, <linux-omap@...r.kernel.org>,
	<bcm-kernel-feedback-list@...adcom.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-rockchip@...ts.infradead.org>, <kernel@...inux.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Wei Xu <xuwei5@...ilicon.com>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Srinivas Kandagatla <srinivas.kandagatla@...il.com>,
	Maxime Coquelin <maxime.coquelin@...com>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Liviu Dudau <liviu.dudau@....com>,
	"Sudeep Holla" <sudeep.holla@....com>,
	Jun Nie <jun.nie@...aro.org>,
	Michal Simek <michal.simek@...inx.com>
Subject: Re: [RFC PATCH] ARM: clocksource: make ARM_GLOBAL_TIMER selectable

On Thu, 2016-02-04 at 20:20:17 +0200, Grygorii Strashko wrote:
> This patch intended to fix following cases: 
> - SoC-A has ARM GT, defines DT node for ARM GT and selects ARM_GLOBAL_TIMER
> statically in Kconfig file. SoC-B has ARM GT and defines DT node for ARM GT,
> but do not selects ARM_GLOBAL_TIMER statically in Kconfig file. In case of
> multiplatform build ARM GT will be implicitly enabled for SoC-B.
> 
> - There is no way to disable ARM GT without modifying Kconfig file,
> once ARM_GLOBAL_TIMER is selected statically in Kconfig file.
> 
> Hence, fix above case by defining both HAVE_ARM_GLOBAL_TIMER and
> ARM_GLOBAL_TIMER as recommended by 'Adding common features and make
> the usage configurable' section in kconfig-language.txt. All places in
> ARM folder where ARM_GLOBAL_TIMER was used now replaced on
> HAVE_ARM_GLOBAL_TIMER.
> 
> Cc: Florian Fainelli <f.fainelli@...il.com>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Wei Xu <xuwei5@...ilicon.com>
> Cc: Shawn Guo <shawnguo@...nel.org>
> Cc: Sascha Hauer <kernel@...gutronix.de>
> Cc: Srinivas Kandagatla <srinivas.kandagatla@...il.com>
> Cc: Maxime Coquelin <maxime.coquelin@...com>
> Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Cc: Liviu Dudau <liviu.dudau@....com>
> Cc: Sudeep Holla <sudeep.holla@....com>
> Cc: Jun Nie <jun.nie@...aro.org>
> Cc: Michal Simek <michal.simek@...inx.com>
> Cc: "Sören Brinkmann" <soren.brinkmann@...inx.com>
> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> 
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> ---
[...]
> diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
> index fd0aeeb..3165720 100644
> --- a/arch/arm/mach-zynq/Kconfig
> +++ b/arch/arm/mach-zynq/Kconfig
> @@ -5,7 +5,7 @@ config ARCH_ZYNQ
>  	select ARCH_SUPPORTS_BIG_ENDIAN
>  	select ARM_AMBA
>  	select ARM_GIC
> -	select ARM_GLOBAL_TIMER if !CPU_FREQ
> +	select HAVE_ARM_GLOBAL_TIMER if !CPU_FREQ

We actually have this issue, as we don't want to use GT when CPU_FREQ is
enabled. But with this change the 'if !CPU_FREQ' becomes obsolete.

Acked-by: Sören Brinkmann <soren.brinkmann@...inx.com>

	Sören