linux-kernel - Re: [PATCH v4] pinctrl: to avoid duplicated calling enable_pinmux

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Message-ID: <538E7642.6080707@marvell.com>
Date:	Wed, 4 Jun 2014 09:28:34 +0800
From:	FanWu <fwu@...vell.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"tony@...mide.com" <tony@...mide.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"swarren@...dia.com" <swarren@...dia.com>,
	Chao Xie <cxie4@...vell.com>, Yilu Mao <ylmao@...vell.com>,
	Ning Jiang <njiang1@...vell.com>,
	Xiaofan Tian <tianxf@...vell.com>,
	Fangsuo Wu <fswu@...vell.com>
Subject: Re: [PATCH v4] pinctrl: to avoid duplicated calling enable_pinmux_setting
 for a pin

On 06/04/2014 12:49 AM, Stephen Warren wrote:
> On 06/03/2014 01:37 AM, fwu@...vell.com wrote:
>> From: Fan Wu <fwu@...vell.com>
>>
>> What the patch did:
>> 1.To call pinmux_disable_setting ahead of pinmux_enable_setting in each time of
>>    calling pinctrl_select_state
>> 2.Remove the HW disable operation in in pinmux_disable_setting function.
>> 3.Remove the disable ops in struct pinmux_ops
> ...
>> Signed-off-by: Fan Wu <fwu@...vell.com>
>> Signed-off-by: Stephen Warren <swarren@...dia.com>
>
> As I mentioned in my previous email, I didn't sign this off. I made some
> suggestions for a better alternative in that email.
>
> If I *had* written that s-o-b, then it should be before yours in the
> patch description since you handled the patch last.
>

The Signed-off didn't bother me.
I will Choose your option 2# and thanks for your suggestion about this :)


>> diff --git a/include/linux/pinctrl/pinmux.h b/include/linux/pinctrl/pinmux.h
>
>> @@ -70,8 +70,6 @@ struct pinmux_ops {
>>   				  unsigned * const num_groups);
>>   	int (*enable) (struct pinctrl_dev *pctldev, unsigned func_selector,
>>   		       unsigned group_selector);
>> -	void (*disable) (struct pinctrl_dev *pctldev, unsigned func_selector,
>> -			 unsigned group_selector);
>
> This will cause a compile failure, since many drivers still set the
> .disable function pointer. You need to update all the driver files to
> remove those functions too. There's quite a bit of code in some of those
> functions, so you'd need the relevant driver maintainers to confirm it's
> OK to remove it. I think only the owners of pinctrl-egra and
> pinctrl-single have ack'd this concept so far.
>

For this part, I think I mentioned this before, simply removing disable 
ops will introduce the compiling error.
I think there are several ways to handle this:
1. Don't remove the disable ops in struct pinmux_ops in this patch but 
to remove the disable ops in struct pinmux_ops after the another patch 
is merged, which is used to remove all of the disable ops user in all 
drivers.
2. Just remove the disable ops in pinmux_ops in this patch, and make a 
another patch ASAP to remove all the disable ops user in all drivers.
3. Remove the disable ops in struct pinmux_ops and remove all the 
disable ops user in all drivers, all in this patch.


For the solution 2, I just think it may be not a good way to include so 
much content in a patch, which are not in a same code level.

I am just inclined to use solution 1# or 3#.

Please share your comments.

Great thanks for this !

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