linux-kernel - Re: [PATCH 4/6] pinctrl: single: Add support for wake-up interrupts

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Date:	Fri, 11 Oct 2013 09:01:46 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Roger Quadros <rogerq@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Ujfalusi <peter.ujfalusi@...com>,
	Prakash Manjunathappa <prakash.pm@...com>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Benoît Cousson <bcousson@...libre.com>,
	Linux-OMAP <linux-omap@...r.kernel.org>
Subject: Re: [PATCH 4/6] pinctrl: single: Add support for wake-up interrupts

* Linus Walleij <linus.walleij@...aro.org> [131011 09:05]:
> On Fri, Oct 11, 2013 at 5:43 PM, Tony Lindgren <tony@...mide.com> wrote:
> > * Linus Walleij <linus.walleij@...aro.org> [131011 03:40]:
> >> On Fri, Oct 11, 2013 at 10:56 AM, Roger Quadros <rogerq@...com> wrote:
> >>
> >> > The register handling is fine. But how do we deal with resource handling?
> >> > e.g. the block that has the deep-core registers might need to be clocked or powered
> >> > before the registers can be accessed.
> >>
> >> Yeah I saw this in the code there.
> >>
> >> In this case it seems syscon-type regmap access can be used to
> >> read/write the registers, so maybe the pin controller also need to
> >>  get a handle on some clock etc?
> >
> > Uhh, let's not go there.. The resource availability needs to be
> > handled transparently in regmap code and the reg provider hardware
> > module driver using runtime PM.
> 
> OK we can surely discuss this with broonie, it makes sense to
> have regmap be able to do its deed transparently.

Yes I think so too. Sounds like we need callbacks for the runtime PM
checks to the "register provider" driver. Hwo knows, maybe those
features are there already :)

Tony
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