linux-kernel - Re: [PATCH v3 2/3] pinctrl: cherryview: Do not add all southwest and north GPIOs to IRQ domain

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Date:   Fri, 23 Sep 2016 21:04:43 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Marc Zyngier <marc.zyngier@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Phidias Chiang <phidias.chiang@...onical.com>,
        Anisse Astier <anisse@...ier.eu>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Yu C Chen <yu.c.chen@...el.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] pinctrl: cherryview: Do not add all southwest and
 north GPIOs to IRQ domain

On Fri, Sep 23, 2016 at 02:58:47PM +0200, Linus Walleij wrote:
> On Tue, Sep 20, 2016 at 2:15 PM, Mika Westerberg
> <mika.westerberg@...ux.intel.com> wrote:
> 
> > It turns out that for north and southwest communities, they can only
> > generate GPIO interrupts for lower 8 interrupts (IntSel value). The upper
> > part (8-15) can only generate GPEs (General Purpose Events).
> >
> > Now the reason why EC events such as pressing hotkeys does not work if we
> > mask all the interrupts is that in order to generate either interrupts or
> > GPEs the INTMASK register must have that particular interrupt unmasked. In
> > case of GPEs the CPU does not trigger normal interrupt (and thus the GPIO
> > driver does not see it) but instead it causes SCI (System Control
> > Interrupt) to be triggered with the GPE in question set.
> >
> > To make this all work as expected we only add those GPIOs to the IRQ domain
> > that can actually generate interrupts (IntSel value 0-7) and skip others.
> >
> > Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> 
> Patch applied, had to merge in the recent fix from -rc6 first but
> after that it applied cleanly. Check the result please!

Looks good, thanks.