linux-kernel - Re: [PATCH 05/14] ARM: call reset_controller_of_init from default time

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Message-ID: <CAL_Jsq+Sk0C-1UHCKE18fEVwBbV=quV9mrJSKTO_UPXWcaYfCw@mail.gmail.com>
Date:	Sun, 15 Feb 2015 16:17:31 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc:	Jonathan Corbet <corbet@....net>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Russell King <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Joe Perches <joe@...ches.com>, Antti Palosaari <crope@....fi>,
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	Rusty Russell <rusty@...tcorp.com.au>,
	Kees Cook <keescook@...omium.org>,
	Michal Marek <mmarek@...e.cz>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
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Subject: Re: [PATCH 05/14] ARM: call reset_controller_of_init from default
 time_init handler

On Thu, Feb 12, 2015 at 11:45 AM, Maxime Coquelin
<mcoquelin.stm32@...il.com> wrote:
> Some DT ARM platforms need the reset controllers to be initialized before
> the timers.
> This is the case of the stm32 and sunxi platforms.

I would say this is the exception, not the rule and therefore should
be handled in a machine desc function. Or it could be part of your
timer setup. Or is the bootloader's problem (like arch timer setup).

We just want to limit how much this mechanism gets used.

Rob

>
> This patch adds a call to reset_controller_of_init() to the default
> .init_time callback when RESET_CONTROLLER is used by the platform.
>
> Signed-off-by: Maxime Coquelin <mcoquelin.stm32@...il.com>
> ---
>  arch/arm/kernel/time.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
> index 0cc7e58..4601b1e 100644
> --- a/arch/arm/kernel/time.c
> +++ b/arch/arm/kernel/time.c
> @@ -20,6 +20,7 @@
>  #include <linux/irq.h>
>  #include <linux/kernel.h>
>  #include <linux/profile.h>
> +#include <linux/reset-controller.h>
>  #include <linux/sched.h>
>  #include <linux/sched_clock.h>
>  #include <linux/smp.h>
> @@ -117,6 +118,9 @@ void __init time_init(void)
>         if (machine_desc->init_time) {
>                 machine_desc->init_time();
>         } else {
> +#ifdef CONFIG_RESET_CONTROLLER
> +               reset_controller_of_init();
> +#endif
>  #ifdef CONFIG_COMMON_CLK
>                 of_clk_init(NULL);
>  #endif
> --
> 1.9.1
>
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