linux-kernel - Re: [PATCH v3 1/2] gpio: Add support for hierarchical IRQ domains

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Date:   Mon, 3 Jun 2019 09:54:05 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Lina Iyer <ilina@...eaurora.org>,
        Jon Hunter <jonathanh@...dia.com>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        Bitan Biswas <bbiswas@...dia.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-tegra@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] gpio: Add support for hierarchical IRQ domains

On Sun, Jun 02, 2019 at 10:35:22PM +0200, Linus Walleij wrote:
> On Sun, Jun 2, 2019 at 3:51 PM Linus Walleij <linus.walleij@...aro.org> wrote:
> > On Wed, May 29, 2019 at 4:53 PM Thierry Reding <thierry.reding@...il.com> wrote:
> >
> > > From: Thierry Reding <treding@...dia.com>
> > >
> > > Hierarchical IRQ domains can be used to stack different IRQ controllers
> > > on top of each other. One specific use-case where this can be useful is
> > > if a power management controller has top-level controls for wakeup
> > > interrupts. In such cases, the power management controller can be a
> > > parent to other interrupt controllers and program additional registers
> > > when an IRQ has its wake capability enabled or disabled.
> > >
> > > Signed-off-by: Thierry Reding <treding@...dia.com>
> > > ---
> > > Changes in v3:
> > > - use irq_create_fwspec_mapping() instead of irq_domain_alloc_irqs()
> > > - add missing kerneldoc for new parent_domain field
> > > - keep IRQ_DOMAIN dependency for clarity
> >
> > Actually I applied the patch, and dropped the two lines making
> > it possible to override .to_irq() for now, so I can illustrate my
> > idea on top. If I manage.
> 
> Bah I rewrote the whole think as I want it, maybe my ideas are stupid
> but take a look at it, also very interested in input from the irqchip
> maintainers.
> 
> Sending it out as RFC in a moment.

Okay, taking a look.

Thierry

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