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

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Date:   Sun, 2 Jun 2019 22:35:22 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Thierry Reding <thierry.reding@...il.com>
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 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.

Yours,
Linus Walleij