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

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Date:	Thu, 10 Oct 2013 09:20:15 -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> [131010 09:19]:
> On Thu, Oct 10, 2013 at 6:00 PM, Tony Lindgren <tony@...mide.com> wrote:
> > * Roger Quadros <rogerq@...com> [131010 06:32]:
> >>
> >> I tried testing this with the USB EHCI driver, but I'm not getting wake up interrupts
> >> while the system is still running and only the EHCI controller is runtime suspended.
> >>
> >> It seems we need to somehow call _reconfigure_io_chain() to update the daisy chain
> >> whenever the pad wakeup_enable bit is changed.
> >
> > Sounds like this is on omap3? Have you tried calling pcs_soc->rearm() in the
> > pcs_irq_handle() like the comments there suggest? At least for me that keeps
> > the wake-up interrupts continuously running on omap3 instead of just idle modes.
> 
> If the rearm() function is calling this _reconfigure_io_chain my comments
> on the fact that this is something that should be handled by the pin
> control driver still apply I think ....

Yes, except that the reconfigure_io_chain registers are in the PRM module, not in
the SCM module where the pinctrl registers are.. And that shared PRM interrupt is
used mostly for the internal domain wake-ups, so we should keep that in the PRM
driver.

Regards,

Tony
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