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

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Date:   Sun, 2 Jun 2019 15:51:51 +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 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.

Yours,
Linus Walleij