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

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Date:	Mon, 16 Feb 2015 13:02:55 +0100
From:	Maxime Coquelin <mcoquelin.stm32@...il.com>
To:	Rob Herring <robherring2@...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>,
	Tejun Heo <tj@...nel.org>, Will Deacon <will.deacon@....com>,
	Nikolay Borisov <Nikolay.Borisov@....com>,
	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>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
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	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [PATCH 05/14] ARM: call reset_controller_of_init from default
 time_init handler

2015-02-15 23:17 GMT+01:00 Rob Herring <robherring2@...il.com>:
> 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).

The only valid way in my opinion would be to implement the init_time
callback (as your first proposal),
duplicating what performs the time_init() function.

Then, if other machines than sunxi and stm32 have some day the same need,
we could consider moving the call to reset_controller_of_init()
function to time_init().

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

Could you elaborate the reason why we want to limit this mechanism please?
I am not sure to understand.

Thanks,
Maxime

>
> 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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