linux-kernel - Re: [PATCH] pinctrl: mediatek: convert to arch

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Date:	Mon, 21 Dec 2015 14:51:14 +0800
From:	Daniel Kurtz <djkurtz@...omium.org>
To:	Yingjoe Chen <yingjoe.chen@...iatek.com>
Cc:	Fabio Estevam <fabio.estevam@...escale.com>,
	Maoguang Meng <maoguang.meng@...iatek.com>,
	Axel Lin <axel.lin@...ics.com>,
	Hongzhou Yang <hongzhou.yang@...iatek.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Patrice Chotard <patrice.chotard@...com>,
	open list <linux-kernel@...r.kernel.org>,
	Fabian Frederick <fabf@...net.be>,
	"open list:PIN CONTROL SUBSYSTEM" <linux-gpio@...r.kernel.org>,
	"moderated list:ARM/Mediatek SoC support" 
	<linux-mediatek@...ts.infradead.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	"moderated list:ARM/Mediatek SoC support" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] pinctrl: mediatek: convert to arch_initcall

On Fri, Dec 18, 2015 at 11:06 PM, Yingjoe Chen
<yingjoe.chen@...iatek.com> wrote:
> On Fri, 2015-12-18 at 12:21 +0800, Daniel Kurtz wrote:
>> Move pinctrl initialization earlier in boot so that real devices can find
>> their pctldev without probe deferring.
>>
>> Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
>> ---
>>  drivers/pinctrl/mediatek/pinctrl-mt6397.c | 2 +-
>>  drivers/pinctrl/mediatek/pinctrl-mt8127.c | 2 +-
>>  drivers/pinctrl/mediatek/pinctrl-mt8135.c | 2 +-
>>  drivers/pinctrl/mediatek/pinctrl-mt8173.c | 2 +-
>>  4 files changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/pinctrl/mediatek/pinctrl-mt6397.c b/drivers/pinctrl/mediatek/pinctrl-mt6397.c
>> index f9751ae..a3780d4 100644
>> --- a/drivers/pinctrl/mediatek/pinctrl-mt6397.c
>> +++ b/drivers/pinctrl/mediatek/pinctrl-mt6397.c
>> @@ -70,7 +70,7 @@ static int __init mtk_pinctrl_init(void)
>>       return platform_driver_register(&mtk_pinctrl_driver);
>>  }
>>
>> -module_init(mtk_pinctrl_init);
>> +arch_initcall(mtk_pinctrl_init);
>
>
> MT6397 is PMIC, which depends on pwrap on main AP to work. Since
> pmic-wrap itself is module_platform_driver, I think it make sense to
> keep this one as module_init. Maybe adding a comment to explain why it
> is different from others will help.

I interpret this the other way - I think that since the PMIC wrapper
provides a bus required for the system PMIC it should also be a
builtin and use arch_initcall.

WDYT?

-Dan
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