linux-kernel - Re: [RFC] ARM: OMAP2+: omap_device: add pinctrl handling

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Message-ID: <CACRpkdY=m1b9Lh27+wHP8FQ4SbVZKmAOCGhxe59aP+TcuR9QaA@mail.gmail.com>
Date:	Mon, 24 Jun 2013 14:06:52 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Grygorii Strashko <grygorii.strashko@...com>
Cc:	Kevin Hilman <khilman@...aro.org>,
	Tony Lindgren <tony@...mide.com>,
	Hebbar Gururaja <gururaja.hebbar@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux-OMAP <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stephen Warren <swarren@...dotorg.org>
Subject: Re: [RFC] ARM: OMAP2+: omap_device: add pinctrl handling

On Fri, Jun 21, 2013 at 5:03 PM, Grygorii Strashko
<grygorii.strashko@...com> wrote:

> Hence, add pinctrl handling in omap_device core:
> 1) on PM runtime resume
> - switch pinctrl state to "default" (todo: "active")
> 2) on PM runtime suspend
> - switch pinctrl state to "idle"
> 3) during system wide suspend
> - switch pinctrl state to "sleep" or "idle" if omap_device core disables device
> - switch pinctrl state to "sleep" if device is disabled already
> 4) during system wide resume
> - switch pinctrl state to "default" (todo: "active") if omap_device core has
>   disabled  device during suspend
> - switch pinctrl state to "idle" if device was already disabled before suspend

I don't understand step 4.

I get the creeps about whether the system is runtime suspended
or runtime resumed when we come to resume proper, so I need
Kevin to have a look at this.

Apart from that it looks good.

Stephen and Tony are trying to figure out the details of whether "active"
is necessary or not in a related thread I think.

Yours,
Linus Walleij
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