linux-kernel - Re: [PATCH v2 0/2] Add GPIO level-sensitive interrupt support

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Date:   Tue, 18 Feb 2020 17:25:55 +0100
From:   Marek Vasut <marex@...x.de>
To:     Alexandre Torgue <alexandre.torgue@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org
Subject: Re: [PATCH v2 0/2] Add GPIO level-sensitive interrupt support

On 2/18/20 2:12 PM, Alexandre Torgue wrote:
> This series adds the possibility to handle gpio interrupts on level.
> 
> GPIO hardware block is directly linked to EXTI block but EXTI handles
> external interrupts only on edge. To be able to handle GPIO interrupt on
> level a "hack" is done in gpio irq chip: parent interrupt (exti irq chip)
> is retriggered following interrupt type and gpio line value.
> 
> In exti irq chip, retrigger ops function is added.

btw. this might be unrelated, but is it possible to have e.g. gpioC2 set
as trigger-level-low and gpioD2 set as trigger-edge-falling ? It seems
8eb2dfee9fb1 ("pinctrl: stm32: add lock mechanism for irqmux selection")
prevents that.