linux-kernel - Re: [PATCH RESEND RFC 1/4] drivers: pinctrl: qcom: add wakeup capability to GPIO

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Date:   Fri, 10 Aug 2018 08:06:30 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Marc Zyngier <marc.zyngier@....com>
Cc:     Lina Iyer <ilina@...eaurora.org>, evgreen@...omium.org,
        linus.walleij@...aro.org, bjorn.andersson@...aro.org,
        rplsssn@...eaurora.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, rnayak@...eaurora.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH RESEND RFC 1/4] drivers: pinctrl: qcom: add wakeup capability to
 GPIO

Quoting Marc Zyngier (2018-08-10 00:45:12)
> On Thu, 09 Aug 2018 18:30:53 +0100,
> Stephen Boyd <swboyd@...omium.org> wrote:
> > 
> > Quoting Marc Zyngier (2018-08-07 23:26:32)
> > > 
> > > Level interrupts should be taken care of without doing anything, by the
> > > very nature of being a level signal.
> > 
> > Right. I suspect we'll still need to configure the PDC to actually wake
> > up on the level triggered signal though so PDC needs to be told to
> > unmask the line.
> 
> Surely this can be done at suspend time with the PDC driver tracking
> the interrupts that are configured as a wake-up source (although it
> needs to track an interrupt that is logically connected to the TLMM,
> which sucks).

The PDC also needs to be configured for wakeups from deep CPU idle
states where the GIC and TLMM are powered down. Lina, can you confirm
this?

Hooking system suspend in that case won't work. Is your hope that we can
avoid using hierarchical irqdomains here entirely?