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Subject: Re: [PATCH v2 0/2] Add GPIO level-sensitive interrupt support
To:     Marek Vasut <marex@denx.de>, Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Linus Walleij <linus.walleij@linaro.org>
CC:     <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <linux-gpio@vger.kernel.org>
References: <20200218131218.10789-1-alexandre.torgue@st.com>
 <b5a2dcab-06db-4863-ac5c-28f4ef0c5ac9@denx.de>
From:   Alexandre Torgue <alexandre.torgue@st.com>
Message-ID: <32e409e6-d475-802a-6a90-c8ba6c0cf6d5@st.com>
Date:   Tue, 18 Feb 2020 19:10:12 +0100
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Hi Marek

On 2/18/20 5:25 PM, Marek Vasut wrote:
> 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.
> 

No it's not possible. Each gpio line doesn't have a dedicated Exti line 
Each Exti line is muxing between gpio banks.

Mapping is done as following:

EXTI0 = A0 or B0 or C0 .... or Z0 : selected by Mux
EXTI1 = A1 or B1 or C1 ....or Z1 : selected by Mux
EXTI2 = A2 or B2 or C2 ....or Z2 : selected by Mux
...

regards
Alexandre