linux-kernel - Re: [PATCH 01/11] pinctrl: single: adopt pinctrl sleep mode management

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Message-ID: <CACRpkdZGV7v2=rrKfiLXF7k3JG-1BEDr5=dC+E96gvpnPCCRcQ@mail.gmail.com>
Date:	Mon, 17 Jun 2013 18:08:51 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Hebbar Gururaja <gururaja.hebbar@...com>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Kevin Hilman <khilman@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vaibhav Bedia <vaibhav.bedia@...com>, sudhakar.raj@...com
Subject: Re: [PATCH 01/11] pinctrl: single: adopt pinctrl sleep mode management

On Mon, Jun 17, 2013 at 2:03 PM, Tony Lindgren <tony@...mide.com> wrote:
> * Linus Walleij <linus.walleij@...aro.org> [130617 04:38]:
>> On Fri, May 31, 2013 at 12:13 PM, Hebbar Gururaja
>> <gururaja.hebbar@...com> wrote:
>>
>> > Make pinctrl-single able to handle suspend/resume events and change
>> > hogged pins states accordingly.
>> >
>> > Signed-off-by: Hebbar Gururaja <gururaja.hebbar@...com>
>> > Cc: Linus Walleij <linus.walleij@...aro.org>
>>
>> Noone said anything about this patch, but it looks very straight-forward
>> to me and seems sound so I have applied it.
>>
>> If Tony or Haojian has strong feelings about it I will dequeue it.
>
> I don't like the hogged pins at all as they prevent me from unloading
> pinctrl-single.. But the patch seems fine to me:

Hm? I think the hogged pins are the *only* pins we can
reliably release when unloading the driver, look:

void pinctrl_unregister(struct pinctrl_dev *pctldev)
{
(...)
        if (!IS_ERR(pctldev->p))
                pinctrl_put(pctldev->p);

That releases all hogged pinctrl handles when unloading
a pinctrl driver.

Yours,
Linus Walleij
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